STM32L010で節電の為に4MHzにする。(内部電圧1.5V) MCO出力 HAL

目的
クロックのテスト
節電化

# include "mbed.h"

DigitalOut myled(PA_4);
//DigitalOut myled(PA_9);

int main()
{

    //クロックの初期化
    HAL_RCC_DeInit();

    //電圧を下げる
    __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE2);//4Mhz 1.5 560uA

    /* 4MHz */
    RCC_OscInitTypeDef RCC_OscInitStruct = {0};
    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
    RCC_OscInitStruct.HSIState = RCC_HSI_DIV4;
    RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
    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);

    //__HAL_RCC_SYSCFG_CLK_ENABLE();
    //__HAL_RCC_PWR_CLK_ENABLE();

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

    __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);

    while(1) {

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

    }

}