STM32L010のPA9に37KHzを出力する HAL

目的
クロックのテスト

いろいろスッキリ改良

/* STM32L010F6P6  -> Mbed NUCLEO-L011K4 program by caa45040 */

# include "mbed.h"

DigitalOut myled(PA_4);

//メインプログラム
int main()
{
    //37KHzのRC発振器を起動する。
    PWR->CR |= PWR_CR_DBP;    
    RCC->CSR |= RCC_CSR_LSION; //RCC->CSR=RCC->CSR | 1; //LSION SET

    //PA9にSYSCLKを出力
    __HAL_RCC_GPIOA_CLK_ENABLE();
    GPIO_InitTypeDef GPIO_InitStruct = {0};
    GPIO_InitStruct.Pin = GPIO_PIN_9;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    GPIO_InitStruct.Alternate = GPIO_AF0_MCO;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

    //HAL_RCC_MCOConfig(RCC_MCO2, RCC_MCO1SOURCE_SYSCLK, RCC_MCODIV_1);
    //HAL_RCC_MCOConfig(RCC_MCO2, RCC_MCO1SOURCE_LSI, RCC_MCODIV_16); //約2KHz
    HAL_RCC_MCOConfig(RCC_MCO2, RCC_MCO1SOURCE_LSI, RCC_MCODIV_1);
    
    //無限ループ
    while(1) {

        myled = 1;
        wait(0.2);
        myled = 0;
        wait(0.2);

    }//while

}//main

改良前

/* STM32L010F6P6  -> Mbed NUCLEO-L011K4 program by caa45040 */

# include "mbed.h"

DigitalOut myled(PA_4);

//メインプログラム
int main()
{
    //クロックの初期化
    HAL_RCC_DeInit();



  //16mhz 37khz
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI|RCC_OSCILLATORTYPE_LSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  RCC_OscInitStruct.LSIState = RCC_LSI_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
  HAL_RCC_OscConfig(&RCC_OscInitStruct);
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
  HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0);




    //PA9にSYSCLKを出力
    __HAL_RCC_GPIOA_CLK_ENABLE();
    GPIO_InitTypeDef GPIO_InitStruct = {0};
    GPIO_InitStruct.Pin = GPIO_PIN_9;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    GPIO_InitStruct.Alternate = GPIO_AF0_MCO;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

    //HAL_RCC_MCOConfig(RCC_MCO2, RCC_MCO1SOURCE_SYSCLK, RCC_MCODIV_1);
    HAL_RCC_MCOConfig(RCC_MCO2, RCC_MCO1SOURCE_LSI, RCC_MCODIV_1);
    

    //無限ループ
    while(1) {

        myled = 1;
        wait(0.2);
        myled = 0;
        wait(0.2);

    }//while

}//main