diff --git a/system_stm32f0xx.c b/system_stm32f0xx.c deleted file mode 100644 --- a/system_stm32f0xx.c +++ /dev/null @@ -1,308 +0,0 @@ -/** - ****************************************************************************** - * @file system_stm32f0xx.c - * @author MCD Application Team - * @version V2.1.0 - * @date 03-Oct-2014 - * @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) 2014 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)16000000) /*!< 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 - * @{ - */ - -/** - * @} - */ - -/** @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; - -__IO 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 - * @{ - */ - -/** - * @} - */ - -/** @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 (STM32F071xB) || defined (STM32F072xB) || defined (STM32F078xB) - /* Reset USART2SW[1:0] USART1SW[1:0], I2C1SW, CECSW, USBSW and ADCSW bits */ - RCC->CFGR3 &= (uint32_t)0xFFFCFE2C; -#elif defined (STM32F091xC) || defined (STM32F098xx) - /* Reset USART3SW[1:0], USART2SW[1:0], USART1SW[1:0], I2C1SW, CECSW bits */ - RCC->CFGR3 &= (uint32_t)0xFFF0FFAC; -#else - /* Reset USART1SW[1:0], I2C1SW, CECSW, USBSW and ADCSW bits */ - RCC->CFGR3 &= (uint32_t)0xFFFFFE2C; -#endif - - /* Reset HSI14 bit */ - RCC->CR2 &= (uint32_t)0xFFFFFFFE; - - /* Disable all interrupts */ - RCC->CIR = 0x00000000; - -} - -/** - * @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(STM32F071xB) || defined(STM32F072xB) || defined(STM32F078xx) || defined(STM32F091xC) || defined(STM32F098xx) - /* 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 || STM32F071xB || STM32F072xB || STM32F078xx || STM32F091xC || STM32F098xx */ - } - 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****/