/p1/workspace/STM32Cube_FW_F4_V1.19.0/Projects/STM32F411RE-Nucleo/Examples_LL/UTILS/UTILS_ConfigureSystemClock/Src/main.c
C | 176 lines | 41 code | 25 blank | 110 comment | 2 complexity | 94266568c3c6f53b5c03db6adee9a898 MD5 | raw file
- /**
- ******************************************************************************
- * @file Examples_LL/UTILS/UTILS_ConfigureSystemClock/Src/main.c
- * @author MCD Application Team
- * @brief This example describes how to configure system clock using PLL with
- * HSI as source clock through the STM32F4xx UTILS LL API.
- ******************************************************************************
- * @attention
- *
- * <h2><center>© COPYRIGHT(c) 2017 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.
- *
- ******************************************************************************
- */
-
- /* Includes ------------------------------------------------------------------*/
- #include "main.h"
-
- /** @addtogroup STM32F4xx_LL_Examples
- * @{
- */
-
- /** @addtogroup UTILS_ConfigureSystemClock
- * @{
- */
-
- /* Private typedef -----------------------------------------------------------*/
- /* Private define ------------------------------------------------------------*/
- /* Private macro -------------------------------------------------------------*/
- /* Private variables ---------------------------------------------------------*/
- /* Variable to store PLL parameters */
- /* Configuration will allow to reach a SYSCLK frequency set to 100MHz:
- Syst freq = ((HSI_VALUE / PLLM) * PLLN)/ PLLR)
- ((16MHz /8) * 200)/ 4) = 100MHz */
- LL_UTILS_PLLInitTypeDef sUTILS_PLLInitStruct = {LL_RCC_PLLM_DIV_8, 200, LL_RCC_PLLP_DIV_4};
-
- /* Variable to store AHB and APB buses clock configuration */
- /* Settings to have HCLK set to 100MHz, APB1 to 54MHz and APB2 to 100MHz */
- LL_UTILS_ClkInitTypeDef sUTILS_ClkInitStruct = {LL_RCC_SYSCLK_DIV_1, LL_RCC_APB1_DIV_2, LL_RCC_APB2_DIV_1};
-
- /* Private function prototypes -----------------------------------------------*/
- void LED_Init(void);
- void MCO_ConfigGPIO(void);
-
- /* Private functions ---------------------------------------------------------*/
-
- /**
- * @brief Main program
- * @param None
- * @retval None
- */
- int main(void)
- {
- /* System started with default clock used after reset */
- /* Set FLASH latency */
- LL_FLASH_SetLatency(LL_FLASH_LATENCY_3);
-
- /* Switch to PLL with HSI as clock source */
- LL_PLL_ConfigSystemClock_HSI(&sUTILS_PLLInitStruct, &sUTILS_ClkInitStruct);
-
- /*
- CMSIS variable automatically updated according to new configuration.
- SystemCoreClock should be equal to calculated HCLK frequency.
- FLASH latency is also tuned according to system constraints described
- in the reference manual.
- */
-
- /* Set Systick to 1ms in using frequency set to SystemCoreClock */
- LL_Init1msTick(SystemCoreClock);
-
- /* Initialize LED2 */
- LED_Init();
-
- /* Configure SYSCLK for MCO */
- MCO_ConfigGPIO();
-
- /* Toggle LED2 in an infinite loop with a period of 1Hz */
- while (1)
- {
- LL_GPIO_TogglePin(LED2_GPIO_PORT, LED2_PIN);
- LL_mDelay(1000);
- }
- }
-
- /**
- * @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);
- /* Reset value is LL_GPIO_OUTPUT_PUSHPULL */
- //LL_GPIO_SetPinOutputType(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_OUTPUT_PUSHPULL);
- /* Reset value is LL_GPIO_SPEED_FREQ_LOW */
- //LL_GPIO_SetPinSpeed(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_SPEED_FREQ_LOW);
- /* Reset value is LL_GPIO_PULL_NO */
- //LL_GPIO_SetPinPull(LED2_GPIO_PORT, LED2_PIN, LL_GPIO_PULL_NO);
- }
-
- /**
- * @brief Configure MCO pin (PA8).
- * @param None
- * @retval None
- */
- void MCO_ConfigGPIO(void)
- {
- /* MCO Clock Enable */
- LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_GPIOA);
-
- /* Configure the MCO 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);
-
- /* Select MCO clock source and prescaler */
- LL_RCC_ConfigMCO(LL_RCC_MCO1SOURCE_PLLCLK, LL_RCC_MCO1_DIV_4);
- }
-
- #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
-
- /**
- * @}
- */
-
- /**
- * @}
- */
-
- /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/