From ebd4feee2cebf77225834f97cebeddd1e8d2ffd1 Mon Sep 17 00:00:00 2001
From: jaseg <git@jaseg.net>
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
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
+ *
+ * <h2><center>© COPYRIGHT(c) 2016 STMicroelectronics</center></h2>
+ *
+ * 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