From ebd4feee2cebf77225834f97cebeddd1e8d2ffd1 Mon Sep 17 00:00:00 2001 From: jaseg Date: Tue, 5 Mar 2019 00:22:27 +0900 Subject: driver/fw: Add missing startup and system file --- driver_fw/startup_stm32f030x6.s | 273 ++++++++++++++++++++++++++++++++ driver_fw/system_stm32f0xx.c | 336 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 609 insertions(+) create mode 100644 driver_fw/startup_stm32f030x6.s create mode 100644 driver_fw/system_stm32f0xx.c (limited to 'driver_fw') diff --git a/driver_fw/startup_stm32f030x6.s b/driver_fw/startup_stm32f030x6.s new file mode 100644 index 0000000..2f0eb42 --- /dev/null +++ b/driver_fw/startup_stm32f030x6.s @@ -0,0 +1,273 @@ +/** + ****************************************************************************** + * @file startup_stm32f030x6.s + * copied from: STM32Cube/Drivers/CMSIS/Device/ST/STM32F0xx/Source/Templates/gcc + * @author MCD Application Team + * @version V2.3.1 + * @date 04-November-2016 + * @brief STM32F030x4/STM32F030x6 devices vector table for Atollic TrueSTUDIO toolchain. + * This module performs: + * - Set the initial SP + * - Set the initial PC == Reset_Handler, + * - Set the vector table entries with the exceptions ISR address + * - Branches to main in the C library (which eventually + * calls main()). + * After Reset the Cortex-M0 processor is in Thread mode, + * priority is Privileged, and the Stack is set to Main. + ****************************************************************************** + * + * Redistribution and use in source and binary forms, with or without modification, + * are permitted provided that the following conditions are met: + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * 2. 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. + * 3. Neither the name of STMicroelectronics nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * 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. + * + ****************************************************************************** + */ + + .syntax unified + .cpu cortex-m0 + .fpu softvfp + .thumb + +.global g_pfnVectors +.global Default_Handler + +/* start address for the initialization values of the .data section. +defined in linker script */ +.word _sidata +/* start address for the .data section. defined in linker script */ +.word _sdata +/* end address for the .data section. defined in linker script */ +.word _edata +/* start address for the .bss section. defined in linker script */ +.word _sbss +/* end address for the .bss section. defined in linker script */ +.word _ebss + + .section .text.Reset_Handler + .weak Reset_Handler + .type Reset_Handler, %function +Reset_Handler: + ldr r0, =_estack + mov sp, r0 /* set stack pointer */ + +/* Copy the data segment initializers from flash to SRAM */ + movs r1, #0 + b LoopCopyDataInit + +CopyDataInit: + ldr r3, =_sidata + ldr r3, [r3, r1] + str r3, [r0, r1] + adds r1, r1, #4 + +LoopCopyDataInit: + ldr r0, =_sdata + ldr r3, =_edata + adds r2, r0, r1 + cmp r2, r3 + bcc CopyDataInit + ldr r2, =_sbss + b LoopFillZerobss +/* Zero fill the bss segment. */ +FillZerobss: + movs r3, #0 + str r3, [r2] + adds r2, r2, #4 + + +LoopFillZerobss: + ldr r3, = _ebss + cmp r2, r3 + bcc FillZerobss + +/* Call the clock system intitialization function.*/ + bl SystemInit +/* Call static constructors */ +// bl __libc_init_array +/* Call the application's entry point.*/ + bl main + +LoopForever: + b LoopForever + + +.size Reset_Handler, .-Reset_Handler + +/** + * @brief This is the code that gets called when the processor receives an + * unexpected interrupt. This simply enters an infinite loop, preserving + * the system state for examination by a debugger. + * + * @param None + * @retval : None +*/ + .section .text.Default_Handler,"ax",%progbits +Default_Handler: +Infinite_Loop: + b Infinite_Loop + .size Default_Handler, .-Default_Handler +/****************************************************************************** +* +* The minimal vector table for a Cortex M0. Note that the proper constructs +* must be placed on this to ensure that it ends up at physical address +* 0x0000.0000. +* +******************************************************************************/ + .section .isr_vector,"a",%progbits + .type g_pfnVectors, %object + .size g_pfnVectors, .-g_pfnVectors + + +g_pfnVectors: + .word _estack + .word Reset_Handler + .word NMI_Handler + .word HardFault_Handler + .word 0 + .word 0 + .word 0 + .word 0 + .word 0 + .word 0 + .word 0 + .word SVC_Handler + .word 0 + .word 0 + .word PendSV_Handler + .word SysTick_Handler + .word WWDG_IRQHandler /* Window WatchDog */ + .word 0 /* Reserved */ + .word RTC_IRQHandler /* RTC through the EXTI line */ + .word FLASH_IRQHandler /* FLASH */ + .word RCC_IRQHandler /* RCC */ + .word EXTI0_1_IRQHandler /* EXTI Line 0 and 1 */ + .word EXTI2_3_IRQHandler /* EXTI Line 2 and 3 */ + .word EXTI4_15_IRQHandler /* EXTI Line 4 to 15 */ + .word 0 /* Reserved */ + .word DMA1_Channel1_IRQHandler /* DMA1 Channel 1 */ + .word DMA1_Channel2_3_IRQHandler /* DMA1 Channel 2 and Channel 3 */ + .word DMA1_Channel4_5_IRQHandler /* DMA1 Channel 4 and Channel 5 */ + .word ADC1_IRQHandler /* ADC1 */ + .word TIM1_BRK_UP_TRG_COM_IRQHandler /* TIM1 Break, Update, Trigger and Commutation */ + .word TIM1_CC_IRQHandler /* TIM1 Capture Compare */ + .word 0 /* Reserved */ + .word TIM3_IRQHandler /* TIM3 */ + .word 0 /* Reserved */ + .word 0 /* Reserved */ + .word TIM14_IRQHandler /* TIM14 */ + .word 0 /* Reserved */ + .word TIM16_IRQHandler /* TIM16 */ + .word TIM17_IRQHandler /* TIM17 */ + .word I2C1_IRQHandler /* I2C1 */ + .word 0 /* Reserved */ + .word SPI1_IRQHandler /* SPI1 */ + .word 0 /* Reserved */ + .word USART1_IRQHandler /* USART1 */ + .word 0 /* Reserved */ + .word 0 /* Reserved */ + .word 0 /* Reserved */ + .word 0 /* Reserved */ + +/******************************************************************************* +* +* Provide weak aliases for each Exception handler to the Default_Handler. +* As they are weak aliases, any function with the same name will override +* this definition. +* +*******************************************************************************/ + + .weak NMI_Handler + .thumb_set NMI_Handler,Default_Handler + + .weak HardFault_Handler + .thumb_set HardFault_Handler,Default_Handler + + .weak SVC_Handler + .thumb_set SVC_Handler,Default_Handler + + .weak PendSV_Handler + .thumb_set PendSV_Handler,Default_Handler + + .weak SysTick_Handler + .thumb_set SysTick_Handler,Default_Handler + + .weak WWDG_IRQHandler + .thumb_set WWDG_IRQHandler,Default_Handler + + .weak RTC_IRQHandler + .thumb_set RTC_IRQHandler,Default_Handler + + .weak FLASH_IRQHandler + .thumb_set FLASH_IRQHandler,Default_Handler + + .weak RCC_IRQHandler + .thumb_set RCC_IRQHandler,Default_Handler + + .weak EXTI0_1_IRQHandler + .thumb_set EXTI0_1_IRQHandler,Default_Handler + + .weak EXTI2_3_IRQHandler + .thumb_set EXTI2_3_IRQHandler,Default_Handler + + .weak EXTI4_15_IRQHandler + .thumb_set EXTI4_15_IRQHandler,Default_Handler + + .weak DMA1_Channel1_IRQHandler + .thumb_set DMA1_Channel1_IRQHandler,Default_Handler + + .weak DMA1_Channel2_3_IRQHandler + .thumb_set DMA1_Channel2_3_IRQHandler,Default_Handler + + .weak DMA1_Channel4_5_IRQHandler + .thumb_set DMA1_Channel4_5_IRQHandler,Default_Handler + + .weak ADC1_IRQHandler + .thumb_set ADC1_IRQHandler,Default_Handler + + .weak TIM1_BRK_UP_TRG_COM_IRQHandler + .thumb_set TIM1_BRK_UP_TRG_COM_IRQHandler,Default_Handler + + .weak TIM1_CC_IRQHandler + .thumb_set TIM1_CC_IRQHandler,Default_Handler + + .weak TIM3_IRQHandler + .thumb_set TIM3_IRQHandler,Default_Handler + + .weak TIM14_IRQHandler + .thumb_set TIM14_IRQHandler,Default_Handler + + .weak TIM16_IRQHandler + .thumb_set TIM16_IRQHandler,Default_Handler + + .weak TIM17_IRQHandler + .thumb_set TIM17_IRQHandler,Default_Handler + + .weak I2C1_IRQHandler + .thumb_set I2C1_IRQHandler,Default_Handler + + .weak SPI1_IRQHandler + .thumb_set SPI1_IRQHandler,Default_Handler + + .weak USART1_IRQHandler + .thumb_set USART1_IRQHandler,Default_Handler + +/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/ + diff --git a/driver_fw/system_stm32f0xx.c b/driver_fw/system_stm32f0xx.c new file mode 100644 index 0000000..a43c3d6 --- /dev/null +++ b/driver_fw/system_stm32f0xx.c @@ -0,0 +1,336 @@ +/** + ****************************************************************************** + * @file system_stm32f0xx.c + * copied from: STM32Cube/Drivers/CMSIS/Device/ST/STM32F0xx/Source/Templates + * @author MCD Application Team + * @version V2.3.1 + * @date 04-November-2016 + * @brief CMSIS Cortex-M0 Device Peripheral Access Layer System Source File. + * + * 1. This file provides two functions and one global variable to be called from + * user application: + * - SystemInit(): This function is called at startup just after reset and + * before branch to main program. This call is made inside + * the "startup_stm32f0xx.s" file. + * + * - SystemCoreClock variable: Contains the core clock (HCLK), it can be used + * by the user application to setup the SysTick + * timer or configure other parameters. + * + * - SystemCoreClockUpdate(): Updates the variable SystemCoreClock and must + * be called whenever the core clock is changed + * during program execution. + * + * 2. After each device reset the HSI (8 MHz) is used as system clock source. + * Then SystemInit() function is called, in "startup_stm32f0xx.s" file, to + * configure the system clock before to branch to main program. + * + * 3. This file configures the system clock as follows: + *============================================================================= + * Supported STM32F0xx device + *----------------------------------------------------------------------------- + * System Clock source | HSI + *----------------------------------------------------------------------------- + * SYSCLK(Hz) | 8000000 + *----------------------------------------------------------------------------- + * HCLK(Hz) | 8000000 + *----------------------------------------------------------------------------- + * AHB Prescaler | 1 + *----------------------------------------------------------------------------- + * APB1 Prescaler | 1 + *----------------------------------------------------------------------------- + *============================================================================= + ****************************************************************************** + * @attention + * + *

© COPYRIGHT(c) 2016 STMicroelectronics

+ * + * Redistribution and use in source and binary forms, with or without modification, + * are permitted provided that the following conditions are met: + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * 2. 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. + * 3. Neither the name of STMicroelectronics nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * 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. + * + ****************************************************************************** + */ + +/** @addtogroup CMSIS + * @{ + */ + +/** @addtogroup stm32f0xx_system + * @{ + */ + +/** @addtogroup STM32F0xx_System_Private_Includes + * @{ + */ + +#include "stm32f0xx.h" + +/** + * @} + */ + +/** @addtogroup STM32F0xx_System_Private_TypesDefinitions + * @{ + */ + +/** + * @} + */ + +/** @addtogroup STM32F0xx_System_Private_Defines + * @{ + */ +#if !defined (HSE_VALUE) + #define HSE_VALUE ((uint32_t)8000000) /*!< Default value of the External oscillator in Hz. + This value can be provided and adapted by the user application. */ +#endif /* HSE_VALUE */ + +#if !defined (HSI_VALUE) + #define HSI_VALUE ((uint32_t)8000000) /*!< Default value of the Internal oscillator in Hz. + This value can be provided and adapted by the user application. */ +#endif /* HSI_VALUE */ + +#if !defined (HSI48_VALUE) +#define HSI48_VALUE ((uint32_t)48000000) /*!< Default value of the HSI48 Internal oscillator in Hz. + This value can be provided and adapted by the user application. */ +#endif /* HSI48_VALUE */ +/** + * @} + */ + +/** @addtogroup STM32F0xx_System_Private_Macros + * @{ + */ + +/** + * @} + */ + +/** @addtogroup STM32F0xx_System_Private_Variables + * @{ + */ + /* This variable is updated in three ways: + 1) by calling CMSIS function SystemCoreClockUpdate() + 2) by calling HAL API function HAL_RCC_GetHCLKFreq() + 3) each time HAL_RCC_ClockConfig() is called to configure the system clock frequency + Note: If you use this function to configure the system clock there is no need to + call the 2 first functions listed above, since SystemCoreClock variable is + updated automatically. + */ +uint32_t SystemCoreClock = 8000000; + +const uint8_t AHBPrescTable[16] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 6, 7, 8, 9}; +const uint8_t APBPrescTable[8] = {0, 0, 0, 0, 1, 2, 3, 4}; + +/** + * @} + */ + +/** @addtogroup STM32F0xx_System_Private_FunctionPrototypes + * @{ + */ + +/** + * @} + */ + +/** @addtogroup STM32F0xx_System_Private_Functions + * @{ + */ + +/** + * @brief Setup the microcontroller system. + * Initialize the default HSI clock source, vector table location and the PLL configuration is reset. + * @param None + * @retval None + */ +void SystemInit(void) +{ + /* Reset the RCC clock configuration to the default reset state ------------*/ + /* Set HSION bit */ + RCC->CR |= (uint32_t)0x00000001U; + +#if defined (STM32F051x8) || defined (STM32F058x8) + /* Reset SW[1:0], HPRE[3:0], PPRE[2:0], ADCPRE and MCOSEL[2:0] bits */ + RCC->CFGR &= (uint32_t)0xF8FFB80CU; +#else + /* Reset SW[1:0], HPRE[3:0], PPRE[2:0], ADCPRE, MCOSEL[2:0], MCOPRE[2:0] and PLLNODIV bits */ + RCC->CFGR &= (uint32_t)0x08FFB80CU; +#endif /* STM32F051x8 or STM32F058x8 */ + + /* Reset HSEON, CSSON and PLLON bits */ + RCC->CR &= (uint32_t)0xFEF6FFFFU; + + /* Reset HSEBYP bit */ + RCC->CR &= (uint32_t)0xFFFBFFFFU; + + /* Reset PLLSRC, PLLXTPRE and PLLMUL[3:0] bits */ + RCC->CFGR &= (uint32_t)0xFFC0FFFFU; + + /* Reset PREDIV[3:0] bits */ + RCC->CFGR2 &= (uint32_t)0xFFFFFFF0U; + +#if defined (STM32F072xB) || defined (STM32F078xx) + /* Reset USART2SW[1:0], USART1SW[1:0], I2C1SW, CECSW, USBSW and ADCSW bits */ + RCC->CFGR3 &= (uint32_t)0xFFFCFE2CU; +#elif defined (STM32F071xB) + /* Reset USART2SW[1:0], USART1SW[1:0], I2C1SW, CECSW and ADCSW bits */ + RCC->CFGR3 &= (uint32_t)0xFFFFCEACU; +#elif defined (STM32F091xC) || defined (STM32F098xx) + /* Reset USART3SW[1:0], USART2SW[1:0], USART1SW[1:0], I2C1SW, CECSW and ADCSW bits */ + RCC->CFGR3 &= (uint32_t)0xFFF0FEACU; +#elif defined (STM32F030x6) || defined (STM32F030x8) || defined (STM32F031x6) || defined (STM32F038xx) || defined (STM32F030xC) + /* Reset USART1SW[1:0], I2C1SW and ADCSW bits */ + RCC->CFGR3 &= (uint32_t)0xFFFFFEECU; +#elif defined (STM32F051x8) || defined (STM32F058xx) + /* Reset USART1SW[1:0], I2C1SW, CECSW and ADCSW bits */ + RCC->CFGR3 &= (uint32_t)0xFFFFFEACU; +#elif defined (STM32F042x6) || defined (STM32F048xx) + /* Reset USART1SW[1:0], I2C1SW, CECSW, USBSW and ADCSW bits */ + RCC->CFGR3 &= (uint32_t)0xFFFFFE2CU; +#elif defined (STM32F070x6) || defined (STM32F070xB) + /* Reset USART1SW[1:0], I2C1SW, USBSW and ADCSW bits */ + RCC->CFGR3 &= (uint32_t)0xFFFFFE6CU; + /* Set default USB clock to PLLCLK, since there is no HSI48 */ + RCC->CFGR3 |= (uint32_t)0x00000080U; +#else + #warning "No target selected" +#endif + + /* Reset HSI14 bit */ + RCC->CR2 &= (uint32_t)0xFFFFFFFEU; + + /* Disable all interrupts */ + RCC->CIR = 0x00000000U; + +} + +/** + * @brief Update SystemCoreClock variable according to Clock Register Values. + * The SystemCoreClock variable contains the core clock (HCLK), it can + * be used by the user application to setup the SysTick timer or configure + * other parameters. + * + * @note Each time the core clock (HCLK) changes, this function must be called + * to update SystemCoreClock variable value. Otherwise, any configuration + * based on this variable will be incorrect. + * + * @note - The system frequency computed by this function is not the real + * frequency in the chip. It is calculated based on the predefined + * constant and the selected clock source: + * + * - If SYSCLK source is HSI, SystemCoreClock will contain the HSI_VALUE(*) + * + * - If SYSCLK source is HSE, SystemCoreClock will contain the HSE_VALUE(**) + * + * - If SYSCLK source is PLL, SystemCoreClock will contain the HSE_VALUE(**) + * or HSI_VALUE(*) multiplied/divided by the PLL factors. + * + * (*) HSI_VALUE is a constant defined in stm32f0xx_hal.h file (default value + * 8 MHz) but the real value may vary depending on the variations + * in voltage and temperature. + * + * (**) HSE_VALUE is a constant defined in stm32f0xx_hal.h file (default value + * 8 MHz), user has to ensure that HSE_VALUE is same as the real + * frequency of the crystal used. Otherwise, this function may + * have wrong result. + * + * - The result of this function could be not correct when using fractional + * value for HSE crystal. + * + * @param None + * @retval None + */ +void SystemCoreClockUpdate (void) +{ + uint32_t tmp = 0, pllmull = 0, pllsource = 0, predivfactor = 0; + + /* Get SYSCLK source -------------------------------------------------------*/ + tmp = RCC->CFGR & RCC_CFGR_SWS; + + switch (tmp) + { + case RCC_CFGR_SWS_HSI: /* HSI used as system clock */ + SystemCoreClock = HSI_VALUE; + break; + case RCC_CFGR_SWS_HSE: /* HSE used as system clock */ + SystemCoreClock = HSE_VALUE; + break; + case RCC_CFGR_SWS_PLL: /* PLL used as system clock */ + /* Get PLL clock source and multiplication factor ----------------------*/ + pllmull = RCC->CFGR & RCC_CFGR_PLLMUL; + pllsource = RCC->CFGR & RCC_CFGR_PLLSRC; + pllmull = ( pllmull >> 18) + 2; + predivfactor = (RCC->CFGR2 & RCC_CFGR2_PREDIV) + 1; + + if (pllsource == RCC_CFGR_PLLSRC_HSE_PREDIV) + { + /* HSE used as PLL clock source : SystemCoreClock = HSE/PREDIV * PLLMUL */ + SystemCoreClock = (HSE_VALUE/predivfactor) * pllmull; + } +#if defined(STM32F042x6) || defined(STM32F048xx) || defined(STM32F072xB) || defined(STM32F078xx) || defined(STM32F091xC) || defined(STM32F098xx) + else if (pllsource == RCC_CFGR_PLLSRC_HSI48_PREDIV) + { + /* HSI48 used as PLL clock source : SystemCoreClock = HSI48/PREDIV * PLLMUL */ + SystemCoreClock = (HSI48_VALUE/predivfactor) * pllmull; + } +#endif /* STM32F042x6 || STM32F048xx || STM32F072xB || STM32F078xx || STM32F091xC || STM32F098xx */ + else + { +#if defined(STM32F042x6) || defined(STM32F048xx) || defined(STM32F070x6) \ + || defined(STM32F078xx) || defined(STM32F071xB) || defined(STM32F072xB) \ + || defined(STM32F070xB) || defined(STM32F091xC) || defined(STM32F098xx) || defined(STM32F030xC) + /* HSI used as PLL clock source : SystemCoreClock = HSI/PREDIV * PLLMUL */ + SystemCoreClock = (HSI_VALUE/predivfactor) * pllmull; +#else + /* HSI used as PLL clock source : SystemCoreClock = HSI/2 * PLLMUL */ + SystemCoreClock = (HSI_VALUE >> 1) * pllmull; +#endif /* STM32F042x6 || STM32F048xx || STM32F070x6 || + STM32F071xB || STM32F072xB || STM32F078xx || STM32F070xB || + STM32F091xC || STM32F098xx || STM32F030xC */ + } + break; + default: /* HSI used as system clock */ + SystemCoreClock = HSI_VALUE; + break; + } + /* Compute HCLK clock frequency ----------------*/ + /* Get HCLK prescaler */ + tmp = AHBPrescTable[((RCC->CFGR & RCC_CFGR_HPRE) >> 4)]; + /* HCLK clock frequency */ + SystemCoreClock >>= tmp; +} + +/** + * @} + */ + +/** + * @} + */ + +/** + * @} + */ + +/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/ + -- cgit