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/**
******************************************************************************
* @file Examples_LL/RCC/RCC_OutputSystemClockOnMCO/Src/main.c
* @author MCD Application Team
* @brief This example describes how to how to configure MCO pin to output
* the system clock through the STM32F4xx RCC LL API.
******************************************************************************
* @attention
*
* Copyright (c) 2017 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "main.h"
/** @addtogroup STM32F4xx_LL_Examples
* @{
*/
/** @addtogroup RCC_OutputSystemClockOnMCO
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Structure based on parameters used for MCO config */
typedef struct
{
uint32_t Source; /*!< Source of the MCO output */
uint32_t Prescaler; /*!< Prescaler applied to MCO output */
} RCC_MCO_ConfigTypeDef;
/* Private define ------------------------------------------------------------*/
/* Number of MCO Config */
#define RCC_MCO_CONFIG_NB 4
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Variable to set different MCO config */
static RCC_MCO_ConfigTypeDef aMCO_Config[RCC_MCO_CONFIG_NB] = {
{LL_RCC_MCO1SOURCE_HSI, LL_RCC_MCO1_DIV_1},
{LL_RCC_MCO1SOURCE_PLLCLK, LL_RCC_MCO1_DIV_4},
{LL_RCC_MCO2SOURCE_SYSCLK, LL_RCC_MCO2_DIV_2},
{LL_RCC_MCO2SOURCE_HSE, LL_RCC_MCO2_DIV_2}
};
/* MCO Config index */
__IO uint8_t bMCOIndex = 0;
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
void MCO_ConfigGPIO(void);
void LED_Init(void);
void UserButton_Init(void);
/* Private functions ---------------------------------------------------------*/
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
/* Configure the system clock to 100 MHz */
SystemClock_Config();
/* Initialize LED2 */
LED_Init();
/* Initialize button in EXTI mode */
UserButton_Init();
/* Configure GPIO for MCO */
MCO_ConfigGPIO();
/* Infinite loop */
while (1)
{
/* All the process are managed in UserButton_Callback function */
/* Each time, user press user-button, a new MCO config is set */
}
}
/**
* @brief Configure MCO pin (PA8 and PC9).
* @param None
* @retval None
*/
void MCO_ConfigGPIO(void)
{
/* MCO1 Clock Enable */
LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_GPIOA);
/* Configure the MCO1 pin in alternate function mode */
LL_GPIO_SetPinMode(GPIOA, LL_GPIO_PIN_8, LL_GPIO_MODE_ALTERNATE);
LL_GPIO_SetPinOutputType(GPIOA, LL_GPIO_PIN_8, LL_GPIO_OUTPUT_PUSHPULL);
LL_GPIO_SetPinSpeed(GPIOA, LL_GPIO_PIN_8, LL_GPIO_SPEED_FREQ_HIGH);
LL_GPIO_SetPinPull(GPIOA, LL_GPIO_PIN_8, LL_GPIO_PULL_NO);
LL_GPIO_SetAFPin_8_15(GPIOA, LL_GPIO_PIN_8, LL_GPIO_AF_0);
/* MCO2 Clock Enable */
LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_GPIOC);
/* Configure the MCO2 pin in alternate function mode */
LL_GPIO_SetPinMode(GPIOC, LL_GPIO_PIN_9, LL_GPIO_MODE_ALTERNATE);
LL_GPIO_SetPinOutputType(GPIOC, LL_GPIO_PIN_9, LL_GPIO_OUTPUT_PUSHPULL);
LL_GPIO_SetPinSpeed(GPIOC, LL_GPIO_PIN_9, LL_GPIO_SPEED_FREQ_HIGH);
LL_GPIO_SetPinPull(GPIOC, LL_GPIO_PIN_9, LL_GPIO_PULL_NO);
LL_GPIO_SetAFPin_8_15(GPIOC, LL_GPIO_PIN_9, LL_GPIO_AF_0);
}
/**
* @brief Initialize LED2.
* @param None
* @retval None
*/
void LED_Init(void)
{
/* Enable the LED2 Clock */
LED2_GPIO_CLK_ENABLE();
/* Configure IO in output push-pull mode to drive external LED2 */
LL_GPIO_SetPinMode(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_MODE_OUTPUT);
}
/**
* @brief Configures User push-button in GPIO or EXTI Line Mode.
* @param None
* @retval None
*/
void UserButton_Init(void)
{
/* Enable the BUTTON Clock */
USER_BUTTON_GPIO_CLK_ENABLE();
/* Configure GPIO for BUTTON */
LL_GPIO_SetPinMode(USER_BUTTON_GPIO_PORT, USER_BUTTON_PIN, LL_GPIO_MODE_INPUT);
LL_GPIO_SetPinPull(USER_BUTTON_GPIO_PORT, USER_BUTTON_PIN, LL_GPIO_PULL_NO);
/* Connect External Line to the GPIO*/
USER_BUTTON_SYSCFG_SET_EXTI();
/* Enable a rising trigger EXTI line 13 Interrupt */
USER_BUTTON_EXTI_LINE_ENABLE();
USER_BUTTON_EXTI_FALLING_TRIG_ENABLE();
/* Configure NVIC for USER_BUTTON_EXTI_IRQn */
NVIC_EnableIRQ(USER_BUTTON_EXTI_IRQn);
NVIC_SetPriority(USER_BUTTON_EXTI_IRQn,0x03);
}
/**
* @brief System Clock Configuration
* The system Clock is configured as follow :
* System Clock source = PLL (HSE)
* SYSCLK(Hz) = 100000000
* HCLK(Hz) = 100000000
* AHB Prescaler = 1
* APB1 Prescaler = 2
* APB2 Prescaler = 1
* HSE Frequency(Hz) = 8000000
* PLL_M = 8
* PLL_N = 400
* PLL_P = 4
* VDD(V) = 3.3
* Main regulator output voltage = Scale1 mode
* Flash Latency(WS) = 3
* @param None
* @retval None
*/
void SystemClock_Config(void)
{
/* Enable HSE oscillator */
LL_RCC_HSE_EnableBypass();
LL_RCC_HSE_Enable();
while(LL_RCC_HSE_IsReady() != 1)
{
};
/* Set FLASH latency */
LL_FLASH_SetLatency(LL_FLASH_LATENCY_3);
/* Main PLL configuration and activation */
LL_RCC_PLL_ConfigDomain_SYS(LL_RCC_PLLSOURCE_HSE, LL_RCC_PLLM_DIV_8, 400, LL_RCC_PLLP_DIV_4);
LL_RCC_PLL_Enable();
while(LL_RCC_PLL_IsReady() != 1)
{
};
/* Sysclk activation on the main PLL */
LL_RCC_SetAHBPrescaler(LL_RCC_SYSCLK_DIV_1);
LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_PLL);
while(LL_RCC_GetSysClkSource() != LL_RCC_SYS_CLKSOURCE_STATUS_PLL)
{
};
/* Set APB1 & APB2 prescaler */
LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_2);
LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_1);
/* Set systick to 1ms */
SysTick_Config(100000000 / 1000);
/* Update CMSIS variable (which can be updated also through SystemCoreClockUpdate function) */
SystemCoreClock = 100000000;
}
/******************************************************************************/
/* USER IRQ HANDLER TREATMENT */
/******************************************************************************/
/**
* @brief Function to manage User button press
* @param None
* @retval None
*/
void UserButton_Callback(void)
{
register uint32_t source = 0, prescaler = 0;
/* Get the MCO config to apply */
source = aMCO_Config[bMCOIndex].Source;
prescaler = aMCO_Config[bMCOIndex].Prescaler;
/* Toggle LED2 to indicate a button press*/
LL_GPIO_TogglePin(LED2_GPIO_PORT, LED2_PIN);
/* Select MCO clock source and prescaler */
LL_RCC_ConfigMCO(source, prescaler);
/* Set new MCO config Index */
bMCOIndex = (bMCOIndex + 1) % RCC_MCO_CONFIG_NB;
}
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t *file, uint32_t line)
{
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d", file, line) */
/* Infinite loop */
while (1)
{
}
}
#endif
/**
* @}
*/
/**
* @}
*/
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