mbed official
mbed library sources. Supersedes mbed-src.
Dependents: Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more
Diff: targets/cmsis/TARGET_STM/TARGET_STM32F0/TARGET_DISCO_F051R8/system_stm32f0xx.c
- Revision:
- 144:ef7eb2e8f9f7
- Parent:
- 56:05912f50f004
--- a/targets/cmsis/TARGET_STM/TARGET_STM32F0/TARGET_DISCO_F051R8/system_stm32f0xx.c Tue Aug 02 14:07:36 2016 +0000
+++ b/targets/cmsis/TARGET_STM/TARGET_STM32F0/TARGET_DISCO_F051R8/system_stm32f0xx.c Fri Sep 02 15:07:44 2016 +0100
@@ -1,479 +1,485 @@
-/**
- ******************************************************************************
- * @file system_stm32f0xx.c
- * @author MCD Application Team
- * @version V2.2.2
- * @date 26-June-2015
- * @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:
- *=============================================================================
- * System clock source | 1- PLL_HSE_EXTC | 3- PLL_HSI
- * | (external 8 MHz clock) | (internal 48 MHz)
- * | 2- PLL_HSE_XTAL |
- * | (external 8 MHz xtal) |
- *-----------------------------------------------------------------------------
- * SYSCLK(MHz) | 48 | 48
- *-----------------------------------------------------------------------------
- * AHBCLK (MHz) | 48 | 48
- *-----------------------------------------------------------------------------
- * APB1CLK (MHz) | 48 | 48
- *-----------------------------------------------------------------------------
- * USB capable (48 MHz precise clock) | YES | YES
- *=============================================================================
- ******************************************************************************
- * @attention
- *
- * <h2><center>© COPYRIGHT(c) 2015 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 */
-
-/**
- * @}
- */
-
-/** @addtogroup STM32F0xx_System_Private_Macros
- * @{
- */
-
-/* Select the clock sources (other than HSI) to start with (0=OFF, 1=ON) */
-#define USE_PLL_HSE_EXTC (1) /* Use external clock */
-#define USE_PLL_HSE_XTAL (1) /* Use external xtal */
-
-/**
- * @}
- */
-
-/** @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 = 48000000;
-
-const uint8_t AHBPrescTable[16] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 6, 7, 8, 9};
-
-/**
- * @}
- */
-
-/** @addtogroup STM32F0xx_System_Private_FunctionPrototypes
- * @{
- */
-
-#if (USE_PLL_HSE_XTAL != 0) || (USE_PLL_HSE_EXTC != 0)
-uint8_t SetSysClock_PLL_HSE(uint8_t bypass);
-#endif
-
-uint8_t SetSysClock_PLL_HSI(void);
-
-/**
- * @}
- */
-
-/** @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)0x00000001;
-
-#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)0xF8FFB80C;
-#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)0x08FFB80C;
-#endif /* STM32F051x8 or STM32F058x8 */
-
- /* Reset HSEON, CSSON and PLLON bits */
- RCC->CR &= (uint32_t)0xFEF6FFFF;
-
- /* Reset HSEBYP bit */
- RCC->CR &= (uint32_t)0xFFFBFFFF;
-
- /* Reset PLLSRC, PLLXTPRE and PLLMUL[3:0] bits */
- RCC->CFGR &= (uint32_t)0xFFC0FFFF;
-
- /* Reset PREDIV[3:0] bits */
- RCC->CFGR2 &= (uint32_t)0xFFFFFFF0;
-
-#if defined (STM32F072xB) || defined (STM32F078xx)
- /* Reset USART2SW[1:0], USART1SW[1:0], I2C1SW, CECSW, USBSW and ADCSW bits */
- RCC->CFGR3 &= (uint32_t)0xFFFCFE2C;
-#elif defined (STM32F071xB)
- /* Reset USART2SW[1:0], USART1SW[1:0], I2C1SW, CECSW and ADCSW bits */
- RCC->CFGR3 &= (uint32_t)0xFFFFCEAC;
-#elif defined (STM32F091xC) || defined (STM32F098xx)
- /* Reset USART3SW[1:0], USART2SW[1:0], USART1SW[1:0], I2C1SW, CECSW and ADCSW bits */
- RCC->CFGR3 &= (uint32_t)0xFFF0FEAC;
-#elif defined (STM32F030x6) || defined (STM32F030x8) || defined (STM32F031x6) || defined (STM32F038xx) || defined (STM32F030xC)
- /* Reset USART1SW[1:0], I2C1SW and ADCSW bits */
- RCC->CFGR3 &= (uint32_t)0xFFFFFEEC;
-#elif defined (STM32F051x8) || defined (STM32F058xx)
- /* Reset USART1SW[1:0], I2C1SW, CECSW and ADCSW bits */
- RCC->CFGR3 &= (uint32_t)0xFFFFFEAC;
-#elif defined (STM32F042x6) || defined (STM32F048xx)
- /* Reset USART1SW[1:0], I2C1SW, CECSW, USBSW and ADCSW bits */
- RCC->CFGR3 &= (uint32_t)0xFFFFFE2C;
-#elif defined (STM32F070x6) || defined (STM32F070xB)
- /* Reset USART1SW[1:0], I2C1SW, USBSW and ADCSW bits */
- RCC->CFGR3 &= (uint32_t)0xFFFFFE6C;
- /* Set default USB clock to PLLCLK, since there is no HSI48 */
- RCC->CFGR3 |= (uint32_t)0x00000080;
-#else
- #warning "No target selected"
-#endif
-
- /* Reset HSI14 bit */
- RCC->CR2 &= (uint32_t)0xFFFFFFFE;
-
- /* Disable all interrupts */
- RCC->CIR = 0x00000000;
-
- /* Enable SYSCFGENR in APB2EN, needed for 1st call of NVIC_SetVector, to copy vectors from flash to ram */
- RCC->APB2ENR |= RCC_APB2ENR_SYSCFGEN;
-
- /* Configure the Cube driver */
- SystemCoreClock = 8000000; // At this stage the HSI is used as system clock
- HAL_Init();
-
- /* Configure the System clock source, PLL Multiplier and Divider factors,
- AHB/APBx prescalers and Flash settings */
- SetSysClock();
-
-}
-
-/**
- * @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;
-}
-
-/**
- * @brief Configures the System clock source, PLL Multiplier and Divider factors,
- * AHB/APBx prescalers and Flash settings
- * @note This function should be called only once the RCC clock configuration
- * is reset to the default reset state (done in SystemInit() function).
- * @param None
- * @retval None
- */
-void SetSysClock(void)
-{
- /* 1- Try to start with HSE and external clock */
-#if USE_PLL_HSE_EXTC != 0
- if (SetSysClock_PLL_HSE(1) == 0)
-#endif
- {
- /* 2- If fail try to start with HSE and external xtal */
- #if USE_PLL_HSE_XTAL != 0
- if (SetSysClock_PLL_HSE(0) == 0)
- #endif
- {
- /* 3- If fail start with HSI clock */
- if (SetSysClock_PLL_HSI() == 0)
- {
- while(1)
- {
- // [TODO] Put something here to tell the user that a problem occured...
- }
- }
- }
- }
-
- // Output clock on MCO pin(PA8) for debugging purpose
- //HAL_RCC_MCOConfig(RCC_MCO, RCC_MCOSOURCE_SYSCLK, RCC_MCO_NODIV); // 48 MHz
-}
-
-#if (USE_PLL_HSE_XTAL != 0) || (USE_PLL_HSE_EXTC != 0)
-/******************************************************************************/
-/* PLL (clocked by HSE) used as System clock source */
-/******************************************************************************/
-uint8_t SetSysClock_PLL_HSE(uint8_t bypass)
-{
- RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
- RCC_OscInitTypeDef RCC_OscInitStruct = {0};
- //Select HSI as system clock source to allow modification of the PLL configuration
- RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_SYSCLK;
- RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
- if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)
- {
- return 0; // FAIL
- }
-
-
- // Select HSE oscillator as PLL source
- RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
- if (bypass == 0) {
- RCC_OscInitStruct.HSEState = RCC_HSE_ON; // External 8 MHz xtal on OSC_IN/OSC_OUT
- } else {
- RCC_OscInitStruct.HSEState = RCC_HSE_BYPASS; // External 8 MHz clock on OSC_IN only
- }
- RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
- RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
- RCC_OscInitStruct.PLL.PREDIV = RCC_PREDIV_DIV2;
- RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL12;
- if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
- return 0; // FAIL
- }
-
- // Select PLL as system clock source and configure the HCLK and PCLK1 clocks dividers
- RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1);
- RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK; // 48 MHz
- RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; // 48 MHz
- RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1; // 48 MHz
- if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK) {
- return 0; // FAIL
- }
-
-// HAL_RCC_MCOConfig(RCC_MCO, RCC_MCOSOURCE_HSE, RCC_MCO_DIV2); // 8/2 = 4 MHz
-
- return 1; // OK
-}
-#endif
-
-/******************************************************************************/
-/* PLL (clocked by HSI) used as System clock source */
-/******************************************************************************/
-uint8_t SetSysClock_PLL_HSI(void)
-{
- RCC_ClkInitTypeDef RCC_ClkInitStruct;
- RCC_OscInitTypeDef RCC_OscInitStruct;
-
- // Select PLLCLK = 48 MHz ((HSI 8 MHz / 2) * 12)
- RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
- RCC_OscInitStruct.HSEState = RCC_HSE_OFF;
- RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
- RCC_OscInitStruct.HSIState = RCC_HSI_ON;
- RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
- RCC_OscInitStruct.HSI14State = RCC_HSI_OFF;
- RCC_OscInitStruct.HSI14CalibrationValue = RCC_HSI14CALIBRATION_DEFAULT;
- RCC_OscInitStruct.HSI48State = RCC_HSI_ON;
- RCC_OscInitStruct.LSIState = RCC_LSI_OFF;
- RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
- RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI; // HSI div 2
- RCC_OscInitStruct.PLL.PREDIV = RCC_PREDIV_DIV1;
- RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL12;
- if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
- return 0; // FAIL
- }
-
- // Select PLL as system clock source and configure the HCLK and PCLK1 clocks dividers
- RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1);
- RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK; // 48 MHz
- RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; // 48 MHz
- RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1; // 48 MHz
- if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK) {
- return 0; // FAIL
- }
-
- //HAL_RCC_MCOConfig(RCC_MCO, RCC_MCOSOURCE_HSI, RCC_MCO_DIV4); // 8/4 = 2 MHz
-
- return 1; // OK
-}
-
-/* Used for the different timeouts in the HAL */
-void SysTick_Handler(void)
-{
- HAL_IncTick();
-}
-
-/**
- * @}
- */
-
-/**
- * @}
- */
-
-/**
- * @}
- */
-
-/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
-
+/**
+ ******************************************************************************
+ * @file system_stm32f0xx.c
+ * @author MCD Application Team
+ * @version V2.3.0
+ * @date 27-May-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:
+ *=============================================================================
+ * System clock source | 1- PLL_HSE_EXTC | 3- PLL_HSI
+ * | (external 8 MHz clock) | (internal 48 MHz)
+ * | 2- PLL_HSE_XTAL |
+ * | (external 8 MHz xtal) |
+ *-----------------------------------------------------------------------------
+ * SYSCLK(MHz) | 48 | 48
+ *-----------------------------------------------------------------------------
+ * AHBCLK (MHz) | 48 | 48
+ *-----------------------------------------------------------------------------
+ * APB1CLK (MHz) | 48 | 48
+ *-----------------------------------------------------------------------------
+ * USB capable (48 MHz precise clock) | YES | YES
+ *=============================================================================
+ ******************************************************************************
+ * @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
+ * @{
+ */
+
+/* Select the clock sources (other than HSI) to start with (0=OFF, 1=ON) */
+#define USE_PLL_HSE_EXTC (1) /* Use external clock */
+#define USE_PLL_HSE_XTAL (1) /* Use external xtal */
+
+/**
+ * @}
+ */
+
+/** @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 = 48000000;
+
+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
+ * @{
+ */
+
+#if (USE_PLL_HSE_XTAL != 0) || (USE_PLL_HSE_EXTC != 0)
+uint8_t SetSysClock_PLL_HSE(uint8_t bypass);
+#endif
+
+uint8_t SetSysClock_PLL_HSI(void);
+
+/**
+ * @}
+ */
+
+/** @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;
+
+ /* Enable SYSCFGENR in APB2EN, needed for 1st call of NVIC_SetVector, to copy vectors from flash to ram */
+ RCC->APB2ENR |= RCC_APB2ENR_SYSCFGEN;
+
+ /* Configure the Cube driver */
+ SystemCoreClock = 8000000; // At this stage the HSI is used as system clock
+ HAL_Init();
+
+ /* Configure the System clock source, PLL Multiplier and Divider factors,
+ AHB/APBx prescalers and Flash settings */
+ SetSysClock();
+
+}
+
+/**
+ * @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;
+}
+
+/**
+ * @brief Configures the System clock source, PLL Multiplier and Divider factors,
+ * AHB/APBx prescalers and Flash settings
+ * @note This function should be called only once the RCC clock configuration
+ * is reset to the default reset state (done in SystemInit() function).
+ * @param None
+ * @retval None
+ */
+void SetSysClock(void)
+{
+ /* 1- Try to start with HSE and external clock */
+#if USE_PLL_HSE_EXTC != 0
+ if (SetSysClock_PLL_HSE(1) == 0)
+#endif
+ {
+ /* 2- If fail try to start with HSE and external xtal */
+ #if USE_PLL_HSE_XTAL != 0
+ if (SetSysClock_PLL_HSE(0) == 0)
+ #endif
+ {
+ /* 3- If fail start with HSI clock */
+ if (SetSysClock_PLL_HSI() == 0)
+ {
+ while(1)
+ {
+ // [TODO] Put something here to tell the user that a problem occured...
+ }
+ }
+ }
+ }
+
+ // Output clock on MCO pin(PA8) for debugging purpose
+ //HAL_RCC_MCOConfig(RCC_MCO, RCC_MCOSOURCE_SYSCLK, RCC_MCO_NODIV); // 48 MHz
+}
+
+#if (USE_PLL_HSE_XTAL != 0) || (USE_PLL_HSE_EXTC != 0)
+/******************************************************************************/
+/* PLL (clocked by HSE) used as System clock source */
+/******************************************************************************/
+uint8_t SetSysClock_PLL_HSE(uint8_t bypass)
+{
+ RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
+ RCC_OscInitTypeDef RCC_OscInitStruct = {0};
+ //Select HSI as system clock source to allow modification of the PLL configuration
+ RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_SYSCLK;
+ RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
+ if(HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)
+ {
+ return 0; // FAIL
+ }
+
+
+ // Select HSE oscillator as PLL source
+ RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
+ if (bypass == 0) {
+ RCC_OscInitStruct.HSEState = RCC_HSE_ON; // External 8 MHz xtal on OSC_IN/OSC_OUT
+ } else {
+ RCC_OscInitStruct.HSEState = RCC_HSE_BYPASS; // External 8 MHz clock on OSC_IN only
+ }
+ RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
+ RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
+ RCC_OscInitStruct.PLL.PREDIV = RCC_PREDIV_DIV2;
+ RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL12;
+ if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
+ return 0; // FAIL
+ }
+
+ // Select PLL as system clock source and configure the HCLK and PCLK1 clocks dividers
+ RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1);
+ RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK; // 48 MHz
+ RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; // 48 MHz
+ RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1; // 48 MHz
+ if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK) {
+ return 0; // FAIL
+ }
+
+// HAL_RCC_MCOConfig(RCC_MCO, RCC_MCOSOURCE_HSE, RCC_MCO_DIV2); // 8/2 = 4 MHz
+
+ return 1; // OK
+}
+#endif
+
+/******************************************************************************/
+/* PLL (clocked by HSI) used as System clock source */
+/******************************************************************************/
+uint8_t SetSysClock_PLL_HSI(void)
+{
+ RCC_ClkInitTypeDef RCC_ClkInitStruct;
+ RCC_OscInitTypeDef RCC_OscInitStruct;
+
+ // Select PLLCLK = 48 MHz ((HSI 8 MHz / 2) * 12)
+ RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
+ RCC_OscInitStruct.HSEState = RCC_HSE_OFF;
+ RCC_OscInitStruct.LSEState = RCC_LSE_OFF;
+ RCC_OscInitStruct.HSIState = RCC_HSI_ON;
+ RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
+ RCC_OscInitStruct.HSI14State = RCC_HSI_OFF;
+ RCC_OscInitStruct.HSI14CalibrationValue = RCC_HSI14CALIBRATION_DEFAULT;
+ RCC_OscInitStruct.HSI48State = RCC_HSI_ON;
+ RCC_OscInitStruct.LSIState = RCC_LSI_OFF;
+ RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
+ RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI; // HSI div 2
+ RCC_OscInitStruct.PLL.PREDIV = RCC_PREDIV_DIV1;
+ RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL12;
+ if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
+ return 0; // FAIL
+ }
+
+ // Select PLL as system clock source and configure the HCLK and PCLK1 clocks dividers
+ RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1);
+ RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK; // 48 MHz
+ RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; // 48 MHz
+ RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1; // 48 MHz
+ if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK) {
+ return 0; // FAIL
+ }
+
+ //HAL_RCC_MCOConfig(RCC_MCO, RCC_MCOSOURCE_HSI, RCC_MCO_DIV4); // 8/4 = 2 MHz
+
+ return 1; // OK
+}
+
+/* Used for the different timeouts in the HAL */
+void SysTick_Handler(void)
+{
+ HAL_IncTick();
+}
+
+/**
+ * @}
+ */
+
+/**
+ * @}
+ */
+
+/**
+ * @}
+ */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
+
