101 lines
2.9 KiB
C
101 lines
2.9 KiB
C
/*
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* File : board.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2013 RT-Thread Develop Team
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rt-thread.org/license/LICENSE
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*
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* Change Logs:
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* Date Author Notes
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* 2009-01-05 Bernard first implementation
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* 2014-07-18 ArdaFu Port to TM4C129X
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*/
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#include <rthw.h>
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#include <rtthread.h>
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#include "board.h"
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#include "driverlib/interrupt.h"
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#include "driverlib/sysctl.h"
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#include "driverlib/systick.h"
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#include "driverlib/fpu.h"
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#include "driverlib/rom_map.h"
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#define SYS_CLOCK_DEFAULT 120000000
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uint32_t SystemCoreClock;
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#define FAULT_NMI 2 // NMI fault
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#define FAULT_HARD 3 // Hard fault
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#define FAULT_MPU 4 // MPU fault
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#define FAULT_BUS 5 // Bus fault
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#define FAULT_USAGE 6 // Usage fault
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#define FAULT_SVCALL 11 // SVCall
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#define FAULT_DEBUG 12 // Debug monitor
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#define FAULT_PENDSV 14 // PendSV
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#define FAULT_SYSTICK 15 // System Tick
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/**
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* This is the timer interrupt service routine.
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*
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*/
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void SysTick_Handler(void)
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{
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/* enter interrupt */
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rt_interrupt_enter();
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rt_tick_increase();
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/* leave interrupt */
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rt_interrupt_leave();
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}
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extern void PendSV_Handler(void);
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extern void HardFault_Handler(void);
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/**
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* This function will initial TM4C129X board.
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*/
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void rt_hw_board_init()
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{
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//init low level drivers. e.g. cpu uart etc.
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rt_components_board_init();
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//init HEAP.
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#ifdef RT_USING_HEAP
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rt_system_heap_init(HEAP_BEGIN, HEAP_END);
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#endif
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//redirect RTT stdio to CONSOLE device
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rt_console_set_device(RT_CONSOLE_DEVICE_NAME);
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}
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int rt_hw_cpu_init(void)
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{
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MAP_IntMasterDisable();
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IntRegister(FAULT_HARD, HardFault_Handler);
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IntRegister(FAULT_PENDSV, PendSV_Handler);
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IntRegister(FAULT_SYSTICK, SysTick_Handler);
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// Enable lazy stacking for interrupt handlers. This allows floating-point
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// instructions to be used within interrupt handlers, but at the expense of
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// extra stack usage.
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MAP_FPULazyStackingEnable();
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// Set the clocking to run directly from the external crystal/oscillator.
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// TODO: The SYSCTL_XTAL_ value must be changed to match the value of the
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// crystal on your board.
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SystemCoreClock = MAP_SysCtlClockFreqSet(
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(SYSCTL_XTAL_25MHZ | SYSCTL_OSC_MAIN | SYSCTL_USE_PLL | SYSCTL_CFG_VCO_480),
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SYS_CLOCK_DEFAULT);
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MAP_SysTickDisable();
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MAP_SysTickPeriodSet(SystemCoreClock/ RT_TICK_PER_SECOND - 1);
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MAP_SysTickIntEnable();
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MAP_SysTickEnable();
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return 0;
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}
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// rt_hw_cpu_init should be run before any other INIT_BOARD_EXPORT
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// We use INIT_EXPORT here and set the sequence index to "0.xxxx"
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INIT_EXPORT(rt_hw_cpu_init, "0.post");
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