1051 lines
32 KiB
C
1051 lines
32 KiB
C
//*****************************************************************************
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//
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// interrupt.c - Driver for the NVIC Interrupt Controller.
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//
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// Copyright (c) 2005-2017 Texas Instruments Incorporated. All rights reserved.
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// Software License Agreement
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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//
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// Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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//
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// Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the
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// distribution.
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//
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// Neither the name of Texas Instruments Incorporated nor the names of
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// its contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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//*****************************************************************************
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//*****************************************************************************
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//
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//! \addtogroup interrupt_api
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//! @{
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//
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//*****************************************************************************
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#include "types.h"
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#include <stdbool.h>
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#include <stdint.h>
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#include "inc/hw_nvic.h"
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#include "cpu.h"
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#include "debug.h"
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#include "interrupt.h"
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//*****************************************************************************
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//
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// This is a mapping between priority grouping encodings and the number of
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// preemption priority bits.
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//
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//*****************************************************************************
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static const uint32_t g_pui32Priority[] =
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{
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NVIC_APINT_PRIGROUP_0_8, NVIC_APINT_PRIGROUP_1_7, NVIC_APINT_PRIGROUP_2_6,
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NVIC_APINT_PRIGROUP_3_5, NVIC_APINT_PRIGROUP_4_4, NVIC_APINT_PRIGROUP_5_3,
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NVIC_APINT_PRIGROUP_6_2, NVIC_APINT_PRIGROUP_7_1
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};
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//*****************************************************************************
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//
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// This is a mapping between interrupt number and the register that contains
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// the priority encoding for that interrupt.
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//
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//*****************************************************************************
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static const uint32_t g_pui32Regs[] =
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{
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0, NVIC_SYS_PRI1, NVIC_SYS_PRI2, NVIC_SYS_PRI3, NVIC_PRI0, NVIC_PRI1,
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NVIC_PRI2, NVIC_PRI3, NVIC_PRI4, NVIC_PRI5, NVIC_PRI6, NVIC_PRI7,
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NVIC_PRI8, NVIC_PRI9, NVIC_PRI10, NVIC_PRI11, NVIC_PRI12, NVIC_PRI13,
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NVIC_PRI14, NVIC_PRI15, NVIC_PRI16, NVIC_PRI17, NVIC_PRI18, NVIC_PRI19,
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NVIC_PRI20, NVIC_PRI21, NVIC_PRI22, NVIC_PRI23, NVIC_PRI24, NVIC_PRI25,
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NVIC_PRI26, NVIC_PRI27, NVIC_PRI28, NVIC_PRI29, NVIC_PRI30, NVIC_PRI31,
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NVIC_PRI32, NVIC_PRI33, NVIC_PRI34
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};
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//*****************************************************************************
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//
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// This is a mapping between interrupt number (for the peripheral interrupts
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// only) and the register that contains the interrupt enable for that
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// interrupt.
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//
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//*****************************************************************************
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static const uint32_t g_pui32EnRegs[] =
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{
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NVIC_EN0, NVIC_EN1, NVIC_EN2, NVIC_EN3, NVIC_EN4
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};
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//*****************************************************************************
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//
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// This is a mapping between interrupt number (for the peripheral interrupts
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// only) and the register that contains the interrupt disable for that
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// interrupt.
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//
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//*****************************************************************************
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static const uint32_t g_pui32Dii16Regs[] =
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{
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NVIC_DIS0, NVIC_DIS1, NVIC_DIS2, NVIC_DIS3, NVIC_DIS4
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};
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//*****************************************************************************
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//
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// This is a mapping between interrupt number (for the peripheral interrupts
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// only) and the register that contains the interrupt pend for that interrupt.
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//
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//*****************************************************************************
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static const uint32_t g_pui32PendRegs[] =
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{
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NVIC_PEND0, NVIC_PEND1, NVIC_PEND2, NVIC_PEND3, NVIC_PEND4
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};
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//*****************************************************************************
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//
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// This is a mapping between interrupt number (for the peripheral interrupts
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// only) and the register that contains the interrupt unpend for that
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// interrupt.
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//
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//*****************************************************************************
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static const uint32_t g_pui32UnpendRegs[] =
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{
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NVIC_UNPEND0, NVIC_UNPEND1, NVIC_UNPEND2, NVIC_UNPEND3, NVIC_UNPEND4
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};
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//*****************************************************************************
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//
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//! \internal
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//! The default interrupt handler.
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//!
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//! This is the default interrupt handler for all interrupts. It simply loops
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//! forever so that the system state is preserved for observation by a
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//! debugger. Since interrupts must be disabled before unregistering the
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//! corresponding handler, this should never be called during normal operation.
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//!
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//! \return None.
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//
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//*****************************************************************************
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static void
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_IntDefaultHandler(void)
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{
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//
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// Go into an infinite loop.
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//
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while (1)
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{
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}
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}
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//*****************************************************************************
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//
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// The processor vector table.
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//
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// This contains a list of the handlers for the various interrupt sources in
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// the system. The layout of this list is defined by the hardware; assertion
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// of an interrupt causes the processor to start executing directly at the
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// address given in the corresponding location in this list.
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//
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//*****************************************************************************
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//
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// Set the size of the vector table to the largest number of interrupts of
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// any device
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//
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#undef NUM_INTERRUPTS
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#define NUM_INTERRUPTS 155
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#if defined(__ICCARM__)
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#pragma data_alignment=1024
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static __no_init void (*g_pfnRAMVectors[NUM_INTERRUPTS])(void) @ "VTABLE";
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#elif defined(sourcerygxx)
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static __attribute__((section(".cs3.region-head.ram")))
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void (*g_pfnRAMVectors[NUM_INTERRUPTS])(void) __attribute__((aligned(1024)));
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#elif defined(__TI_ARM__) || defined(DOXYGEN)
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#pragma DATA_ALIGN(g_pfnRAMVectors, 1024)
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#pragma DATA_SECTION(g_pfnRAMVectors, ".vtable")
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void (*g_pfnRAMVectors[NUM_INTERRUPTS])(void);
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#else
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static __attribute__((section("vtable")))
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void (*g_pfnRAMVectors[NUM_INTERRUPTS])(void) __attribute__((aligned(1024)));
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#endif
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//*****************************************************************************
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//
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//! Enables the processor interrupt.
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//!
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//! This function allows the processor to respond to interrupts. This function
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//! does not affect the set of interrupts enabled in the interrupt controller;
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//! it just gates the single interrupt from the controller to the processor.
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//!
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//! \b Example: Enable interrupts to the processor.
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//!
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//! \verbatim
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//! //
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//! // Enable interrupts to the processor.
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//! //
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//! IntMasterEnable();
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//!
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//! \endverbatim
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//!
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//! \return Returns \b true if interrupts were disabled when the function was
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//! called or \b false if they were initially enabled.
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//
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//*****************************************************************************
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bool
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IntMasterEnable(void)
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{
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//
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// Enable processor interrupts.
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//
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return (CPUcpsie());
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}
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//*****************************************************************************
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//
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//! Disables the processor interrupt.
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//!
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//! This function prevents the processor from receiving interrupts. This
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//! function does not affect the set of interrupts enabled in the interrupt
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//! controller; it just gates the single interrupt from the controller to the
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//! processor.
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//!
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//! \note Previously, this function had no return value. As such, it was
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//! possible to include <tt>interrupt.h</tt> and call this function without
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//! having included <tt>types.h</tt>. Now that the return is a
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//! <tt>bool</tt>, a compiler error occurs in this case. The solution
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//! is to include <tt>types.h</tt> before including <tt>interrupt.h</tt>.
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//!
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//! \b Example: Disable interrupts to the processor.
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//!
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//! \verbatim
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//! //
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//! // Disable interrupts to the processor.
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//! //
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//! IntMasterDisable();
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//!
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//! \endverbatim
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//!
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//! \return Returns \b true if interrupts were already disabled when the
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//! function was called or \b false if they were initially enabled.
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//
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//*****************************************************************************
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bool
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IntMasterDisable(void)
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{
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//
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// Disable processor interrupts.
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//
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return (CPUcpsid());
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}
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//*****************************************************************************
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//
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//! Registers a function to be called when an interrupt occurs.
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//!
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//! \param ui32Interrupt specifies the interrupt in question.
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//! \param pfnHandler is a pointer to the function to be called.
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//!
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//! This function is used to specify the handler function to be called when the
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//! given interrupt is asserted to the processor. The \e ui32Interrupt
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//! parameter must be one of the valid \b INT_* values listed in Peripheral
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//! Driver Library User's Guide and defined in the inc/hw_ints.h header file.
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//! When the interrupt occurs, if it is enabled (via IntEnable()), the handler
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//! function is called in interrupt context. Because the handler function can
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//! preempt other code, care must be taken to protect memory or peripherals
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//! that are accessed by the handler and other non-handler code.
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//!
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//! \note The use of this function (directly or indirectly via a peripheral
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//! driver interrupt register function) moves the interrupt vector table from
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//! flash to SRAM. Therefore, care must be taken when linking the application
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//! to ensure that the SRAM vector table is located at the beginning of SRAM;
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//! otherwise the NVIC does not look in the correct portion of memory for the
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//! vector table (it requires the vector table be on a 1 kB memory alignment).
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//! Normally, the SRAM vector table is so placed via the use of linker scripts.
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//! See the discussion of compile-time versus run-time interrupt handler
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//! registration in the introduction to this chapter.
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//!
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//! \b Example: Set the UART 0 interrupt handler.
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//!
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//! \verbatim
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//!
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//! //
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//! // UART 0 interrupt handler.
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//! //
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//! void
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//! UART0Handler(void)
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//! {
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//! //
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//! // Handle interrupt.
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//! //
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//! }
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//!
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//! //
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//! // Set the UART 0 interrupt handler.
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//! //
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//! IntRegister(INT_UART0, UART0Handler);
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//!
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//! \endverbatim
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//!
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//! \return None.
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//
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//*****************************************************************************
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void
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IntRegister(uint32_t ui32Interrupt, void (*pfnHandler)(void))
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{
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uint32_t ui32Idx, ui32Value;
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//
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// Check the arguments.
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//
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ASSERT(ui32Interrupt < NUM_INTERRUPTS);
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//
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// Make sure that the RAM vector table is correctly aligned.
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//
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ASSERT(((uint32_t)g_pfnRAMVectors & 0x000003ff) == 0);
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//
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// See if the RAM vector table has been initialized.
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//
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if (HWREG(NVIC_VTABLE) != (uint32_t)g_pfnRAMVectors)
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{
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//
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// Copy the vector table from the beginning of FLASH to the RAM vector
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// table.
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//
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ui32Value = HWREG(NVIC_VTABLE);
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for (ui32Idx = 0; ui32Idx < NUM_INTERRUPTS; ui32Idx++)
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{
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g_pfnRAMVectors[ui32Idx] = (void (*)(void))HWREG((ui32Idx * 4) +
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ui32Value);
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}
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//
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// Point the NVIC at the RAM vector table.
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//
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HWREG(NVIC_VTABLE) = (uint32_t)g_pfnRAMVectors;
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}
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//
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// Save the interrupt handler.
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//
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g_pfnRAMVectors[ui32Interrupt] = pfnHandler;
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}
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//*****************************************************************************
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//
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//! Unregisters the function to be called when an interrupt occurs.
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//!
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//! \param ui32Interrupt specifies the interrupt in question.
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//!
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//! This function is used to indicate that no handler is called when the
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//! given interrupt is asserted to the processor. The \e ui32Interrupt
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//! parameter must be one of the valid \b INT_* values listed in Peripheral
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//! Driver Library User's Guide and defined in the inc/hw_ints.h header file.
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//! The interrupt source is automatically disabled (via IntDisable()) if
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//! necessary.
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//!
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//! \sa IntRegister() for important information about registering interrupt
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//! handlers.
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//!
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//! \b Example: Reset the UART 0 interrupt handler to the default handler.
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//!
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//! \verbatim
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//! //
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//! // Reset the UART 0 interrupt handler to the default handler.
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//! //
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//! IntUnregister(INT_UART0);
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//!
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//! \endverbatim
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//!
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//! \return None.
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//
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//*****************************************************************************
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void
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IntUnregister(uint32_t ui32Interrupt)
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{
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//
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// Check the arguments.
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//
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ASSERT(ui32Interrupt < NUM_INTERRUPTS);
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//
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// Reset the interrupt handler.
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//
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g_pfnRAMVectors[ui32Interrupt] = _IntDefaultHandler;
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}
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//*****************************************************************************
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//
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//! Sets the priority grouping of the interrupt controller.
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//!
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//! \param ui32Bits specifies the number of bits of preemptable priority.
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//!
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//! This function specifies the split between preemptable priority levels and
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//! sub-priority levels in the interrupt priority specification. Three bits are
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//! available for hardware interrupt prioritization and therefore priority
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//! grouping values of three through seven have the same effect.
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//!
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//! \b Example: Set the priority grouping for the interrupt controller.
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//!
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//! \verbatim
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//! //
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//! // Set the priority grouping for the interrupt controller to 2 bits.
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//! //
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//! IntPriorityGroupingSet(2);
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//!
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//! \endverbatim
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//!
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//! \return None.
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//
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//*****************************************************************************
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void
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IntPriorityGroupingSet(uint32_t ui32Bits)
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{
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//
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// Check the arguments.
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//
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ASSERT(ui32Bits < NUM_PRIORITY);
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//
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// Set the priority grouping.
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//
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HWREG(NVIC_APINT) = NVIC_APINT_VECTKEY | g_pui32Priority[ui32Bits];
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}
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//*****************************************************************************
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//
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//! Gets the priority grouping of the interrupt controller.
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//!
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//! This function returns the split between preemptable priority levels and
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//! sub-priority levels in the interrupt priority specification.
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//!
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//! \b Example: Get the priority grouping for the interrupt controller.
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//!
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//! \verbatim
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//! //
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//! // Get the priority grouping for the interrupt controller.
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//! //
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//! IntPriorityGroupingGet();
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//!
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//! \endverbatim
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//!
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//! \return The number of bits of preemptable priority.
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//
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//*****************************************************************************
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uint32_t
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IntPriorityGroupingGet(void)
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{
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uint32_t ui32Loop, ui32Value;
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//
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// Read the priority grouping.
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//
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ui32Value = HWREG(NVIC_APINT) & NVIC_APINT_PRIGROUP_M;
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//
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// Loop through the priority grouping values.
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//
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for (ui32Loop = 0; ui32Loop < NUM_PRIORITY; ui32Loop++)
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{
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//
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// Stop looping if this value matches.
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//
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if (ui32Value == g_pui32Priority[ui32Loop])
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{
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break;
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}
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}
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|
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//
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// Return the number of priority bits.
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//
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return (ui32Loop);
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}
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|
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//*****************************************************************************
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//
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//! Sets the priority of an interrupt.
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//!
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//! \param ui32Interrupt specifies the interrupt in question.
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//! \param ui8Priority specifies the priority of the interrupt.
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//!
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//! This function is used to set the priority of an interrupt. The
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//! \e ui32Interrupt parameter must be one of the valid \b INT_* values listed
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//! in Peripheral Driver Library User's Guide and defined in the inc/hw_ints.h
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//! header file. The \e ui8Priority parameter specifies the interrupts
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//! hardware priority level of the interrupt in the interrupt controller.
|
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//! When multiple interrupts are asserted simultaneously, the ones with the
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//! highest priority are processed before the lower priority interrupts.
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//! Smaller numbers correspond to higher interrupt priorities; priority 0 is
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//! the highest interrupt priority.
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//!
|
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//! \note The hardware priority mechanism only looks at the upper 3 bits of the
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//! priority level, so any prioritization must be performed in those bits. The
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//! remaining bits can be used to sub-prioritize the interrupt sources, and may
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//! be used by the hardware priority mechanism. This arrangement allows
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//! priorities to migrate to different NVIC implementations without changing the
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//! gross prioritization of the interrupts.
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//!
|
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//! \b Example: Set priorities for UART 0 and USB interrupts.
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//!
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//! \verbatim
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//! //
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//! // Set the UART 0 interrupt priority to the lowest priority.
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//! //
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//! IntPrioritySet(INT_UART0, 0xE0);
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//!
|
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//! //
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//! // Set the USB 0 interrupt priority to the highest priority.
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//! //
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//! IntPrioritySet(INT_USB0, 0);
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//!
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//! \endverbatim
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//!
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//! \return None.
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//
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//*****************************************************************************
|
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void
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IntPrioritySet(uint32_t ui32Interrupt, uint8_t ui8Priority)
|
|
{
|
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uint32_t ui32Temp;
|
|
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT((ui32Interrupt >= 4) && (ui32Interrupt < NUM_INTERRUPTS));
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|
|
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//
|
|
// Set the interrupt priority.
|
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//
|
|
ui32Temp = HWREG(g_pui32Regs[ui32Interrupt >> 2]);
|
|
ui32Temp &= ~(0xFF << (8 * (ui32Interrupt & 3)));
|
|
ui32Temp |= ui8Priority << (8 * (ui32Interrupt & 3));
|
|
HWREG(g_pui32Regs[ui32Interrupt >> 2]) = ui32Temp;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Gets the priority of an interrupt.
|
|
//!
|
|
//! \param ui32Interrupt specifies the interrupt in question.
|
|
//!
|
|
//! This function gets the priority of an interrupt. The \e ui32Interrupt
|
|
//! parameter must be one of the valid \b INT_* values listed in Peripheral
|
|
//! Driver Library User's Guide and defined in the inc/hw_ints.h header file.
|
|
//! See IntPrioritySet() for a full definition of the priority value.
|
|
//!
|
|
//! \b Example: Get the current UART 0 interrupt priority.
|
|
//!
|
|
//! \verbatim
|
|
//! //
|
|
//! // Get the current UART 0 interrupt priority.
|
|
//! //
|
|
//! IntPriorityGet(INT_UART0);
|
|
//!
|
|
//! \endverbatim
|
|
//!
|
|
//! \return Returns the interrupt priority for the given interrupt.
|
|
//
|
|
//*****************************************************************************
|
|
int32_t
|
|
IntPriorityGet(uint32_t ui32Interrupt)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT((ui32Interrupt >= 4) && (ui32Interrupt < NUM_INTERRUPTS));
|
|
|
|
//
|
|
// Return the interrupt priority.
|
|
//
|
|
return ((HWREG(g_pui32Regs[ui32Interrupt >> 2]) >>
|
|
(8 * (ui32Interrupt & 3))) & 0xFF);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Enables an interrupt.
|
|
//!
|
|
//! \param ui32Interrupt specifies the interrupt to be enabled.
|
|
//!
|
|
//! The specified interrupt is enabled in the interrupt controller. The
|
|
//! \e ui32Interrupt parameter must be one of the valid \b INT_* values listed
|
|
//! in Peripheral Driver Library User's Guide and defined in the inc/hw_ints.h
|
|
//! header file. Other enables for the interrupt (such as at the peripheral
|
|
//! level) are unaffected by this function.
|
|
//!
|
|
//! \b Example: Enable the UART 0 interrupt.
|
|
//!
|
|
//! \verbatim
|
|
//! //
|
|
//! // Enable the UART 0 interrupt in the interrupt controller.
|
|
//! //
|
|
//! IntEnable(INT_UART0);
|
|
//!
|
|
//! \endverbatim
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
IntEnable(uint32_t ui32Interrupt)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(ui32Interrupt < NUM_INTERRUPTS);
|
|
|
|
//
|
|
// Determine the interrupt to enable.
|
|
//
|
|
if (ui32Interrupt == FAULT_MPU)
|
|
{
|
|
//
|
|
// Enable the MemManage interrupt.
|
|
//
|
|
HWREG(NVIC_SYS_HND_CTRL) |= NVIC_SYS_HND_CTRL_MEM;
|
|
}
|
|
else if (ui32Interrupt == FAULT_BUS)
|
|
{
|
|
//
|
|
// Enable the bus fault interrupt.
|
|
//
|
|
HWREG(NVIC_SYS_HND_CTRL) |= NVIC_SYS_HND_CTRL_BUS;
|
|
}
|
|
else if (ui32Interrupt == FAULT_USAGE)
|
|
{
|
|
//
|
|
// Enable the usage fault interrupt.
|
|
//
|
|
HWREG(NVIC_SYS_HND_CTRL) |= NVIC_SYS_HND_CTRL_USAGE;
|
|
}
|
|
else if (ui32Interrupt == FAULT_SYSTICK)
|
|
{
|
|
//
|
|
// Enable the System Tick interrupt.
|
|
//
|
|
HWREG(NVIC_ST_CTRL) |= NVIC_ST_CTRL_INTEN;
|
|
}
|
|
else if (ui32Interrupt >= 16)
|
|
{
|
|
//
|
|
// Enable the general interrupt.
|
|
//
|
|
HWREG(g_pui32EnRegs[(ui32Interrupt - 16) / 32]) =
|
|
1 << ((ui32Interrupt - 16) & 31);
|
|
}
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Disables an interrupt.
|
|
//!
|
|
//! \param ui32Interrupt specifies the interrupt to be disabled.
|
|
//!
|
|
//! The specified interrupt is disabled in the interrupt controller. The
|
|
//! \e ui32Interrupt parameter must be one of the valid \b INT_* values listed
|
|
//! in interrupt.h. Other enables for the interrupt (such as at the peripheral
|
|
//! level) are unaffected by this function.
|
|
//!
|
|
//! \b Example: Disable the UART 0 interrupt.
|
|
//!
|
|
//! \verbatim
|
|
//! //
|
|
//! // Disable the UART 0 interrupt in the interrupt controller.
|
|
//! //
|
|
//! IntDisable(INT_UART0);
|
|
//!
|
|
//! \endverbatim
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
IntDisable(uint32_t ui32Interrupt)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(ui32Interrupt < NUM_INTERRUPTS);
|
|
|
|
//
|
|
// Determine the interrupt to disable.
|
|
//
|
|
if (ui32Interrupt == FAULT_MPU)
|
|
{
|
|
//
|
|
// Disable the MemManage interrupt.
|
|
//
|
|
HWREG(NVIC_SYS_HND_CTRL) &= ~(NVIC_SYS_HND_CTRL_MEM);
|
|
}
|
|
else if (ui32Interrupt == FAULT_BUS)
|
|
{
|
|
//
|
|
// Disable the bus fault interrupt.
|
|
//
|
|
HWREG(NVIC_SYS_HND_CTRL) &= ~(NVIC_SYS_HND_CTRL_BUS);
|
|
}
|
|
else if (ui32Interrupt == FAULT_USAGE)
|
|
{
|
|
//
|
|
// Disable the usage fault interrupt.
|
|
//
|
|
HWREG(NVIC_SYS_HND_CTRL) &= ~(NVIC_SYS_HND_CTRL_USAGE);
|
|
}
|
|
else if (ui32Interrupt == FAULT_SYSTICK)
|
|
{
|
|
//
|
|
// Disable the System Tick interrupt.
|
|
//
|
|
HWREG(NVIC_ST_CTRL) &= ~(NVIC_ST_CTRL_INTEN);
|
|
}
|
|
else if (ui32Interrupt >= 16)
|
|
{
|
|
//
|
|
// Disable the general interrupt.
|
|
//
|
|
HWREG(g_pui32Dii16Regs[(ui32Interrupt - 16) / 32]) =
|
|
1 << ((ui32Interrupt - 16) & 31);
|
|
}
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Returns if a peripheral interrupt is enabled.
|
|
//!
|
|
//! \param ui32Interrupt specifies the interrupt to check.
|
|
//!
|
|
//! This function checks if the specified interrupt is enabled in the interrupt
|
|
//! controller. The \e ui32Interrupt parameter must be one of the valid
|
|
//! \b INT_* values listed in interrupt.h.
|
|
//!
|
|
//! \b Example: Disable the UART 0 interrupt if it is enabled.
|
|
//!
|
|
//! \verbatim
|
|
//! //
|
|
//! // Disable the UART 0 interrupt if it is enabled.
|
|
//! //
|
|
//! if(IntIsEnabled(INT_UART0))
|
|
//! {
|
|
//! IntDisable(INT_UART0);
|
|
//! }
|
|
//! \endverbatim
|
|
//!
|
|
//! \return A non-zero value if the interrupt is enabled.
|
|
//
|
|
//*****************************************************************************
|
|
uint32_t
|
|
IntIsEnabled(uint32_t ui32Interrupt)
|
|
{
|
|
uint32_t ui32Ret;
|
|
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(ui32Interrupt < NUM_INTERRUPTS);
|
|
|
|
//
|
|
// Initialize the return value.
|
|
//
|
|
ui32Ret = 0;
|
|
|
|
//
|
|
// Determine the interrupt to disable.
|
|
//
|
|
if (ui32Interrupt == FAULT_MPU)
|
|
{
|
|
//
|
|
// Check the MemManage interrupt.
|
|
//
|
|
ui32Ret = HWREG(NVIC_SYS_HND_CTRL) & NVIC_SYS_HND_CTRL_MEM;
|
|
}
|
|
else if (ui32Interrupt == FAULT_BUS)
|
|
{
|
|
//
|
|
// Check the bus fault interrupt.
|
|
//
|
|
ui32Ret = HWREG(NVIC_SYS_HND_CTRL) & NVIC_SYS_HND_CTRL_BUS;
|
|
}
|
|
else if (ui32Interrupt == FAULT_USAGE)
|
|
{
|
|
//
|
|
// Check the usage fault interrupt.
|
|
//
|
|
ui32Ret = HWREG(NVIC_SYS_HND_CTRL) & NVIC_SYS_HND_CTRL_USAGE;
|
|
}
|
|
else if (ui32Interrupt == FAULT_SYSTICK)
|
|
{
|
|
//
|
|
// Check the System Tick interrupt.
|
|
//
|
|
ui32Ret = HWREG(NVIC_ST_CTRL) & NVIC_ST_CTRL_INTEN;
|
|
}
|
|
else if (ui32Interrupt >= 16)
|
|
{
|
|
//
|
|
// Check the general interrupt.
|
|
//
|
|
ui32Ret = HWREG(g_pui32EnRegs[(ui32Interrupt - 16) / 32]) &
|
|
(1 << ((ui32Interrupt - 16) & 31));
|
|
}
|
|
return (ui32Ret);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Pends an interrupt.
|
|
//!
|
|
//! \param ui32Interrupt specifies the interrupt to be pended.
|
|
//!
|
|
//! The specified interrupt is pended in the interrupt controller. The
|
|
//! \e ui32Interrupt parameter must be one of the valid \b INT_* values listed
|
|
//! in interrupt.h. Pending an interrupt causes the interrupt controller to
|
|
//! execute the corresponding interrupt handler at the next available time,
|
|
//! based on the current interrupt state priorities. For example, if called by
|
|
//! a higher priority interrupt handler, the specified interrupt handler is not
|
|
//! called until after the current interrupt handler has completed execution.
|
|
//! The interrupt must have been enabled for it to be called.
|
|
//!
|
|
//! \b Example: Pend a UART 0 interrupt.
|
|
//!
|
|
//! \verbatim
|
|
//! //
|
|
//! // Pend a UART 0 interrupt.
|
|
//! //
|
|
//! IntPendSet(INT_UART0);
|
|
//! \endverbatim
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
IntPendSet(uint32_t ui32Interrupt)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(ui32Interrupt < NUM_INTERRUPTS);
|
|
|
|
//
|
|
// Determine the interrupt to pend.
|
|
//
|
|
if (ui32Interrupt == FAULT_NMI)
|
|
{
|
|
//
|
|
// Pend the NMI interrupt.
|
|
//
|
|
HWREG(NVIC_INT_CTRL) |= NVIC_INT_CTRL_NMI_SET;
|
|
}
|
|
else if (ui32Interrupt == FAULT_PENDSV)
|
|
{
|
|
//
|
|
// Pend the PendSV interrupt.
|
|
//
|
|
HWREG(NVIC_INT_CTRL) |= NVIC_INT_CTRL_PEND_SV;
|
|
}
|
|
else if (ui32Interrupt == FAULT_SYSTICK)
|
|
{
|
|
//
|
|
// Pend the SysTick interrupt.
|
|
//
|
|
HWREG(NVIC_INT_CTRL) |= NVIC_INT_CTRL_PENDSTSET;
|
|
}
|
|
else if (ui32Interrupt >= 16)
|
|
{
|
|
//
|
|
// Pend the general interrupt.
|
|
//
|
|
HWREG(g_pui32PendRegs[(ui32Interrupt - 16) / 32]) =
|
|
1 << ((ui32Interrupt - 16) & 31);
|
|
}
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Un-pends an interrupt.
|
|
//!
|
|
//! \param ui32Interrupt specifies the interrupt to be un-pended. The
|
|
//! \e ui32Interrupt parameter must be one of the valid \b INT_* values listed
|
|
//! in interrupt.h.
|
|
//!
|
|
//! The specified interrupt is un-pended in the interrupt controller. This
|
|
//! causes any previously generated interrupts that have not been handled
|
|
//! yet (due to higher priority interrupts or the interrupt not having been
|
|
//! enabled yet) to be discarded.
|
|
//!
|
|
//! \b Example: Un-pend a UART 0 interrupt.
|
|
//!
|
|
//! \verbatim
|
|
//! //
|
|
//! // Un-pend a UART 0 interrupt.
|
|
//! //
|
|
//! IntPendClear(INT_UART0);
|
|
//! \endverbatim
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
IntPendClear(uint32_t ui32Interrupt)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT(ui32Interrupt < NUM_INTERRUPTS);
|
|
|
|
//
|
|
// Determine the interrupt to unpend.
|
|
//
|
|
if (ui32Interrupt == FAULT_PENDSV)
|
|
{
|
|
//
|
|
// Unpend the PendSV interrupt.
|
|
//
|
|
HWREG(NVIC_INT_CTRL) |= NVIC_INT_CTRL_UNPEND_SV;
|
|
}
|
|
else if (ui32Interrupt == FAULT_SYSTICK)
|
|
{
|
|
//
|
|
// Unpend the SysTick interrupt.
|
|
//
|
|
HWREG(NVIC_INT_CTRL) |= NVIC_INT_CTRL_PENDSTCLR;
|
|
}
|
|
else if (ui32Interrupt >= 16)
|
|
{
|
|
//
|
|
// Unpend the general interrupt.
|
|
//
|
|
HWREG(g_pui32UnpendRegs[(ui32Interrupt - 16) / 32]) =
|
|
1 << ((ui32Interrupt - 16) & 31);
|
|
}
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Sets the priority masking level
|
|
//!
|
|
//! \param ui32PriorityMask is the priority level that is masked.
|
|
//!
|
|
//! This function sets the interrupt priority masking level so that all
|
|
//! interrupts at the specified or lesser priority level are masked. Masking
|
|
//! interrupts can be used to globally disable a set of interrupts with
|
|
//! priority below a predetermined threshold. A value of 0 disables priority
|
|
//! masking.
|
|
//!
|
|
//! Smaller numbers correspond to higher interrupt priorities. So for example
|
|
//! a priority level mask of 4 allows interrupts of priority level 0-3,
|
|
//! and interrupts with a numerical priority of 4 and greater are blocked.
|
|
//!
|
|
//! \note The hardware priority mechanism only looks at the upper 3 bits of the
|
|
//! priority level, so any prioritization must be performed in those bits.
|
|
//!
|
|
//! \b Example: Mask of interrupt priorities greater than or equal to 0x80.
|
|
//!
|
|
//! \verbatim
|
|
//! //
|
|
//! // Mask of interrupt priorities greater than or equal to 0x80.
|
|
//! //
|
|
//! IntPriorityMaskSet(0x80);
|
|
//! \endverbatim
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
IntPriorityMaskSet(uint32_t ui32PriorityMask)
|
|
{
|
|
//
|
|
// Set the priority mask.
|
|
//
|
|
CPUbasepriSet(ui32PriorityMask);
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Gets the priority masking level
|
|
//!
|
|
//! This function gets the current setting of the interrupt priority masking
|
|
//! level. The value returned is the priority level such that all interrupts
|
|
//! of that and lesser priority are masked. A value of 0 means that priority
|
|
//! masking is disabled.
|
|
//!
|
|
//! Smaller numbers correspond to higher interrupt priorities. So for example
|
|
//! a priority level mask of 4 allows interrupts of priority level 0-3,
|
|
//! and interrupts with a numerical priority of 4 and greater are blocked.
|
|
//!
|
|
//! The hardware priority mechanism only looks at the upper 3 bits of the
|
|
//! priority level, so any prioritization must be performed in those bits.
|
|
//!
|
|
//! \b Example: Get the current interrupt priority mask.
|
|
//!
|
|
//! \verbatim
|
|
//! //
|
|
//! // Get the current interrupt priority mask.
|
|
//! //
|
|
//! IntPriorityMaskGet();
|
|
//! \endverbatim
|
|
//!
|
|
//! \return Returns the value of the interrupt priority level mask.
|
|
//
|
|
//*****************************************************************************
|
|
uint32_t
|
|
IntPriorityMaskGet(void)
|
|
{
|
|
//
|
|
// Return the current priority mask.
|
|
//
|
|
return (CPUbasepriGet());
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
//! Triggers an interrupt.
|
|
//!
|
|
//! \param ui32Interrupt specifies the interrupt to be triggered.
|
|
//!
|
|
//! This function performs a software trigger of an interrupt. The
|
|
//! \e ui32Interrupt parameter must be one of the valid \b INT_* values listed
|
|
//! in interrupt.h. The interrupt controller behaves as if the corresponding
|
|
//! interrupt line was asserted, and the interrupt is handled in the same
|
|
//! manner (meaning that it must be enabled in order to be processed, and the
|
|
//! processing is based on its priority with respect to other unhandled
|
|
//! interrupts).
|
|
//!
|
|
//! \return None.
|
|
//
|
|
//*****************************************************************************
|
|
void
|
|
IntTrigger(uint32_t ui32Interrupt)
|
|
{
|
|
//
|
|
// Check the arguments.
|
|
//
|
|
ASSERT((ui32Interrupt >= 16) && (ui32Interrupt < NUM_INTERRUPTS));
|
|
|
|
//
|
|
// Trigger this interrupt.
|
|
//
|
|
HWREG(NVIC_SW_TRIG) = ui32Interrupt - 16;
|
|
}
|
|
|
|
//*****************************************************************************
|
|
//
|
|
// Close the Doxygen group.
|
|
//! @}
|
|
//
|
|
//*****************************************************************************
|