目的
最軽量化
PA0(6ピン)から入力してPA4(10ピン)でLチカする。
x Mbedのリビジョンは、143


# include "mbed.h"

//DigitalOut myled(PA_4);

//AnalogIn adc_vbat(PA_0);

int main() {

    __HAL_RCC_GPIOA_CLK_ENABLE();
    __HAL_RCC_ADC1_CLK_ENABLE();
    
    GPIO_InitTypeDef GPIO_InitStruct = {0};

    GPIO_InitStruct.Pin = GPIO_PIN_0;
    GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
    
    GPIO_InitStruct.Pin = GPIO_PIN_4;
    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
  
    ADC_HandleTypeDef hadc;
  
    hadc.Instance = ADC1;
    hadc.Init.OversamplingMode = DISABLE;
    hadc.Init.ClockPrescaler = ADC_CLOCK_SYNC_PCLK_DIV1;
    hadc.Init.Resolution = ADC_RESOLUTION_12B;
    hadc.Init.SamplingTime = ADC_SAMPLETIME_1CYCLE_5;
    hadc.Init.ScanConvMode = ADC_SCAN_DIRECTION_FORWARD;
    hadc.Init.DataAlign = ADC_DATAALIGN_RIGHT;
    hadc.Init.ContinuousConvMode = DISABLE;
    hadc.Init.DiscontinuousConvMode = DISABLE;
    hadc.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
    hadc.Init.ExternalTrigConv = ADC_SOFTWARE_START;
    hadc.Init.DMAContinuousRequests = DISABLE;
    hadc.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
    hadc.Init.Overrun = ADC_OVR_DATA_PRESERVED;
    hadc.Init.LowPowerAutoWait = DISABLE;
    hadc.Init.LowPowerFrequencyMode = ENABLE;
    hadc.Init.LowPowerAutoPowerOff = DISABLE;
    HAL_ADC_Init(&hadc);
  
    ADC_ChannelConfTypeDef sConfig = {0};
    sConfig.Channel = ADC_CHANNEL_0;
    sConfig.Rank = ADC_RANK_CHANNEL_NUMBER;
    HAL_ADC_ConfigChannel(&hadc, &sConfig);
    
    HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4, GPIO_PIN_SET);
    
    int a=0;

    while(1) {

        HAL_ADC_Start(&hadc);
        if( HAL_ADC_PollForConversion(&hadc, 1000) == HAL_OK )
        {
            a = HAL_ADC_GetValue(&hadc);
        }
        HAL_ADC_Stop(&hadc);


        if(a > 500) {
            //myled = 1;
            HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4, GPIO_PIN_SET);
        } else {
            //myled = 0;
            HAL_GPIO_WritePin(GPIOA, GPIO_PIN_4, GPIO_PIN_RESET);
        }
        
        //if(a==0){a=1;}else{a=0;}
        //wait_ms(500);
    }
}