242 lines
6.6 KiB
C
242 lines
6.6 KiB
C
/**
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******************************************************************************
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* @file Examples_LL/RCC/RCC_OutputSystemClockOnMCO/Src/main.c
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* @author MCD Application Team
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* @brief This example describes how to how to configure MCO pin to output
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* the system clock through the STM32F1xx RCC LL API.
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******************************************************************************
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* @attention
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*
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* Copyright (c) 2016 STMicroelectronics.
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* All rights reserved.
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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*
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******************************************************************************
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*/
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/* Includes ------------------------------------------------------------------*/
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#include "main.h"
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/** @addtogroup STM32F1xx_LL_Examples
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* @{
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*/
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/** @addtogroup RCC_OutputSystemClockOnMCO
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* @{
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*/
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/* Private typedef -----------------------------------------------------------*/
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/* Private define ------------------------------------------------------------*/
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/* Number of MCO Config */
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#define RCC_MCO_CONFIG_NB 3
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/* Private macro -------------------------------------------------------------*/
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/* Private variables ---------------------------------------------------------*/
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/* Variable to set different MCO config */
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static uint32_t aMCO_Src[RCC_MCO_CONFIG_NB] = {
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LL_RCC_MCO1SOURCE_SYSCLK,
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LL_RCC_MCO1SOURCE_PLLCLK_DIV_2,
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LL_RCC_MCO1SOURCE_HSE
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};
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/* MCO Config index */
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__IO uint8_t bMCOIndex = 0;
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/* Private function prototypes -----------------------------------------------*/
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void SystemClock_Config(void);
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void MCO_ConfigGPIO(void);
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void LED_Init(void);
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void UserButton_Init(void);
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/* Private functions ---------------------------------------------------------*/
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/**
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* @brief Main program
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* @param None
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* @retval None
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*/
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int main(void)
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{
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/* Configure the system clock to 72 MHz */
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SystemClock_Config();
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/* Initialize LED2 */
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LED_Init();
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/* Initialize button in EXTI mode */
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UserButton_Init();
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/* Configure GPIO for MCO */
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MCO_ConfigGPIO();
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/* Infinite loop */
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while (1)
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{
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/* All the process are managed in UserButton_Callback function */
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/* Each time, user press user-button, a new MCO config is set */
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}
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}
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/**
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* @brief Configure MCO pin (PA8).
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* @param None
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* @retval None
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*/
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void MCO_ConfigGPIO(void)
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{
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/* MCO Clock Enable */
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LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_GPIOA);
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/* Configure the MCO pin in alternate function mode */
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LL_GPIO_SetPinMode(GPIOA, LL_GPIO_PIN_8, LL_GPIO_MODE_ALTERNATE);
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LL_GPIO_SetPinOutputType(GPIOA, LL_GPIO_PIN_8, LL_GPIO_OUTPUT_PUSHPULL);
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LL_GPIO_SetPinSpeed(GPIOA, LL_GPIO_PIN_8, LL_GPIO_SPEED_FREQ_HIGH);
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}
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/**
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* @brief Initialize LED2.
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* @param None
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* @retval None
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*/
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void LED_Init(void)
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{
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/* Enable the LED2 Clock */
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LED2_GPIO_CLK_ENABLE();
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/* Configure IO in output push-pull mode to drive external LED2 */
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LL_GPIO_SetPinMode(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_MODE_OUTPUT);
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}
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/**
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* @brief Configures User push-button in GPIO or EXTI Line Mode.
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* @param None
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* @retval None
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*/
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void UserButton_Init(void)
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{
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/* Enable the BUTTON Clock */
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USER_BUTTON_GPIO_CLK_ENABLE();
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/* Configure GPIO for BUTTON */
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LL_GPIO_SetPinMode(USER_BUTTON_GPIO_PORT, USER_BUTTON_PIN, LL_GPIO_MODE_INPUT);
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/* Connect External Line to the GPIO*/
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USER_BUTTON_GPIO_AF_SET_EXTI();
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/* Enable a rising trigger EXTI line 13 Interrupt */
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USER_BUTTON_EXTI_LINE_ENABLE();
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USER_BUTTON_EXTI_FALLING_TRIG_ENABLE();
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/* Configure NVIC for USER_BUTTON_EXTI_IRQn */
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NVIC_EnableIRQ(USER_BUTTON_EXTI_IRQn);
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NVIC_SetPriority(USER_BUTTON_EXTI_IRQn,0x03);
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}
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/**
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* @brief System Clock Configuration
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* The system Clock is configured as follow :
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* System Clock source = PLL (HSE)
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* SYSCLK(Hz) = 72000000
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* HCLK(Hz) = 72000000
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* AHB Prescaler = 1
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* APB1 Prescaler = 2
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* APB2 Prescaler = 1
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* HSE Frequency(Hz) = 8000000
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* PLLMUL = 9
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* Flash Latency(WS) = 2
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* @param None
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* @retval None
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*/
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void SystemClock_Config(void)
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{
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/* Set FLASH latency */
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LL_FLASH_SetLatency(LL_FLASH_LATENCY_2);
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/* Enable HSE oscillator */
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LL_RCC_HSE_EnableBypass();
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LL_RCC_HSE_Enable();
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while(LL_RCC_HSE_IsReady() != 1)
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{
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};
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/* Main PLL configuration and activation */
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LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSE_DIV_1, LL_RCC_PLL_MUL_9);
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LL_RCC_PLL_Enable();
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while(LL_RCC_PLL_IsReady() != 1)
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{
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};
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/* Sysclk activation on the main PLL */
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LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);
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LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_PLL);
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while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_PLL)
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{
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};
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/* Set APB1 & APB2 prescaler*/
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LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_2);
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LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_1);
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/* Set systick to 1ms in using frequency set to 72MHz */
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LL_Init1msTick(72000000);
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/* Update CMSIS variable (which can be updated also through SystemCoreClockUpdate function) */
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LL_SetSystemCoreClock(72000000);
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}
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/******************************************************************************/
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/* USER IRQ HANDLER TREATMENT */
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/******************************************************************************/
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/**
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* @brief Function to manage User button press
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* @param None
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* @retval None
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*/
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void UserButton_Callback(void)
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{
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register uint32_t source = 0;
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/* Get the MCO config to apply */
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source = aMCO_Src[bMCOIndex];
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/* Toggle LED2 to indicate a button press*/
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LL_GPIO_TogglePin(LED2_GPIO_PORT, LED2_PIN);
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/* Select MCO clock source */
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LL_RCC_ConfigMCO(source);
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/* Set new MCO config Index */
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bMCOIndex = (bMCOIndex + 1) % RCC_MCO_CONFIG_NB;
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}
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#ifdef USE_FULL_ASSERT
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/**
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* @brief Reports the name of the source file and the source line number
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* where the assert_param error has occurred.
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* @param file: pointer to the source file name
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* @param line: assert_param error line source number
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* @retval None
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*/
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void assert_failed(uint8_t *file, uint32_t line)
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{
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/* User can add his own implementation to report the file name and line number,
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ex: printf("Wrong parameters value: file %s on line %d", file, line) */
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/* Infinite loop */
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while (1)
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{
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}
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}
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#endif
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/**
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* @}
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*/
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/**
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* @}
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*/
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