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rt-thread-official/bsp/imxrt/Libraries/imxrt1021/devices/MIMXRT1021/system_MIMXRT1021.c

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/*
** ###################################################################
** Processors: MIMXRT1021CAF4A
** MIMXRT1021CAG4A
** MIMXRT1021DAF5A
** MIMXRT1021DAG5A
**
** Compilers: Keil ARM C/C++ Compiler
** Freescale C/C++ for Embedded ARM
** GNU C Compiler
** IAR ANSI C/C++ Compiler for ARM
** MCUXpresso Compiler
**
** Reference manual: IMXRT1020RM Rev. C, 02/2018
** Version: rev. 0.1, 2017-11-06
** Build: b180316
**
** Abstract:
** Provides a system configuration function and a global variable that
** contains the system frequency. It configures the device and initializes
** the oscillator (PLL) that is part of the microcontroller device.
**
** The Clear BSD License
** Copyright 2016 Freescale Semiconductor, Inc.
** Copyright 2016-2018 NXP
** All rights reserved.
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted (subject to the limitations in the
** disclaimer below) provided that the following conditions are met:
**
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
**
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in the
** documentation and/or other materials provided with the distribution.
**
** * Neither the name of the copyright holder nor the names of its
** contributors may be used to endorse or promote products derived from
** this software without specific prior written permission.
**
** NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE
** GRANTED BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT
** HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
** WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
** MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
** DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
** LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
** CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
** SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
** BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
** WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
** OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
** IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**
** http: www.nxp.com
** mail: support@nxp.com
**
** Revisions:
** - rev. 0.1 (2017-11-06)
** Initial version.
**
** ###################################################################
*/
/*!
* @file MIMXRT1021
* @version 0.1
* @date 2017-11-06
* @brief Device specific configuration file for MIMXRT1021 (implementation file)
*
* Provides a system configuration function and a global variable that contains
* the system frequency. It configures the device and initializes the oscillator
* (PLL) that is part of the microcontroller device.
*/
#include <stdint.h>
#include "fsl_device_registers.h"
/* ----------------------------------------------------------------------------
-- Core clock
---------------------------------------------------------------------------- */
uint32_t SystemCoreClock = DEFAULT_SYSTEM_CLOCK;
/* ----------------------------------------------------------------------------
-- SystemInit()
---------------------------------------------------------------------------- */
void SystemInit (void) {
#if ((__FPU_PRESENT == 1) && (__FPU_USED == 1))
SCB->CPACR |= ((3UL << 10*2) | (3UL << 11*2)); /* set CP10, CP11 Full Access */
#endif /* ((__FPU_PRESENT == 1) && (__FPU_USED == 1)) */
#if defined(__MCUXPRESSO)
extern uint32_t g_pfnVectors[]; // Vector table defined in startup code
SCB->VTOR = (uint32_t)g_pfnVectors;
#endif
/* Disable Watchdog Power Down Counter */
WDOG1->WMCR &= ~WDOG_WMCR_PDE_MASK;
WDOG2->WMCR &= ~WDOG_WMCR_PDE_MASK;
/* Watchdog disable */
#if (DISABLE_WDOG)
if (WDOG1->WCR & WDOG_WCR_WDE_MASK)
{
WDOG1->WCR &= ~WDOG_WCR_WDE_MASK;
}
if (WDOG2->WCR & WDOG_WCR_WDE_MASK)
{
WDOG2->WCR &= ~WDOG_WCR_WDE_MASK;
}
RTWDOG->CNT = 0xD928C520U; /* 0xD928C520U is the update key */
RTWDOG->TOVAL = 0xFFFF;
RTWDOG->CS = (uint32_t) ((RTWDOG->CS) & ~RTWDOG_CS_EN_MASK) | RTWDOG_CS_UPDATE_MASK;
#endif /* (DISABLE_WDOG) */
/* Disable Systick which might be enabled by bootrom */
if (SysTick->CTRL & SysTick_CTRL_ENABLE_Msk)
{
SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk;
}
/* Enable instruction and data caches */
#if defined(__ICACHE_PRESENT) && __ICACHE_PRESENT
if (SCB_CCR_IC_Msk != (SCB_CCR_IC_Msk & SCB->CCR)) {
SCB_EnableICache();
}
#endif
#if defined(__DCACHE_PRESENT) && __DCACHE_PRESENT
if (SCB_CCR_DC_Msk != (SCB_CCR_DC_Msk & SCB->CCR)) {
SCB_EnableDCache();
}
#endif
/* Suggest to add it in assembly file */
// IOMUXC_GPR->GPR17 = 0x0000AAA5;//
// IOMUXC_GPR->GPR16 |= 0x00000007;
SystemInitHook();
}
/* ----------------------------------------------------------------------------
-- SystemCoreClockUpdate()
---------------------------------------------------------------------------- */
void SystemCoreClockUpdate (void) {
uint32_t freq;
uint32_t PLL2MainClock;
uint32_t PLL3MainClock;
/* Check if system pll is bypassed */
if(CCM_ANALOG->PLL_SYS & CCM_ANALOG_PLL_SYS_BYPASS_MASK)
{
PLL2MainClock = CPU_XTAL_CLK_HZ;
}
else
{
PLL2MainClock = (CPU_XTAL_CLK_HZ * ((CCM_ANALOG->PLL_SYS & CCM_ANALOG_PLL_SYS_DIV_SELECT_MASK) ? 22U : 20U));
}
PLL2MainClock += ((uint64_t)CPU_XTAL_CLK_HZ * ((uint64_t)(CCM_ANALOG->PLL_SYS_NUM))) / ((uint64_t)(CCM_ANALOG->PLL_SYS_DENOM));
/* Check if usb1 pll is bypassed */
if(CCM_ANALOG->PLL_USB1 & CCM_ANALOG_PLL_USB1_BYPASS_MASK)
{
PLL3MainClock = CPU_XTAL_CLK_HZ;
}
else
{
PLL3MainClock = (CPU_XTAL_CLK_HZ * ((CCM_ANALOG->PLL_USB1 & CCM_ANALOG_PLL_USB1_DIV_SELECT_MASK) ? 22U : 20U));
}
/* Periph_clk2_clk ---> Periph_clk */
if (CCM->CBCDR & CCM_CBCDR_PERIPH_CLK_SEL_MASK)
{
switch (CCM->CBCMR & CCM_CBCMR_PERIPH_CLK2_SEL_MASK)
{
/* Pll3_sw_clk ---> Periph_clk2_clk ---> Periph_clk ---> Core_clock */
case CCM_CBCMR_PERIPH_CLK2_SEL(0U):
freq = PLL3MainClock;
break;
/* Osc_clk ---> Periph_clk2_clk ---> Periph_clk ---> Core_clock */
case CCM_CBCMR_PERIPH_CLK2_SEL(1U):
freq = CPU_XTAL_CLK_HZ;
break;
/* Pll2_bypass_clk ---> Periph_clk2_clk ---> Periph_clk ---> Core_clock */
case CCM_CBCMR_PERIPH_CLK2_SEL(2U):
freq = CPU_XTAL_CLK_HZ;
case CCM_CBCMR_PERIPH_CLK2_SEL(3U):
default:
freq = 0U;
break;
}
freq /= (((CCM->CBCDR & CCM_CBCDR_PERIPH_CLK2_PODF_MASK) >> CCM_CBCDR_PERIPH_CLK2_PODF_SHIFT) + 1U);
}
/* Pre_Periph_clk ---> Periph_clk */
else
{
switch (CCM->CBCMR & CCM_CBCMR_PRE_PERIPH_CLK_SEL_MASK)
{
/* PLL2 ---> Pre_Periph_clk ---> Periph_clk ---> Core_clock */
case CCM_CBCMR_PRE_PERIPH_CLK_SEL(0U):
freq = PLL2MainClock;
break;
/* PLL3 PFD3 ---> Pre_Periph_clk ---> Periph_clk ---> Core_clock */
case CCM_CBCMR_PRE_PERIPH_CLK_SEL(1U):
freq = PLL3MainClock / ((CCM_ANALOG->PFD_480 & CCM_ANALOG_PFD_480_PFD3_FRAC_MASK) >> CCM_ANALOG_PFD_480_PFD3_FRAC_SHIFT) * 18U;
break;
/* PLL2 PFD3 ---> Pre_Periph_clk ---> Periph_clk ---> Core_clock */
case CCM_CBCMR_PRE_PERIPH_CLK_SEL(2U):
freq = PLL2MainClock / ((CCM_ANALOG->PFD_528 & CCM_ANALOG_PFD_528_PFD3_FRAC_MASK) >> CCM_ANALOG_PFD_528_PFD3_FRAC_SHIFT) * 18U;
break;
/* PLL6 ---> Pre_Periph_clk ---> Periph_clk ---> Core_clock */
case CCM_CBCMR_PRE_PERIPH_CLK_SEL(3U):
freq = 500000000U / (((CCM->CACRR & CCM_CACRR_ARM_PODF_MASK) >> CCM_CACRR_ARM_PODF_SHIFT) + 1U);
break;
default:
freq = 0U;
break;
}
}
SystemCoreClock = (freq / (((CCM->CBCDR & CCM_CBCDR_AHB_PODF_MASK) >> CCM_CBCDR_AHB_PODF_SHIFT) + 1U));
}
/* ----------------------------------------------------------------------------
-- SystemInitHook()
---------------------------------------------------------------------------- */
__attribute__ ((weak)) void SystemInitHook (void) {
/* Void implementation of the weak function. */
}
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