adc.c

[詳解]

/** @file
    @brief      STM32 ADC(GPIO PC0)

    @date       2015.08.31
    @author     Takashi SHUDO
*/

#include "device.h"
#include "system.h"

#include "stm32f4xx_hal.h"

ADC_HandleTypeDef hadc1;

/* ADC1 init function */
void MX_ADC1_Init(void)
{
        ADC_ChannelConfTypeDef sConfig;

        hadc1.Instance = ADC1;
        hadc1.Init.ClockPrescaler = ADC_CLOCKPRESCALER_PCLK_DIV2;
        hadc1.Init.Resolution = ADC_RESOLUTION12b;
        hadc1.Init.ScanConvMode = DISABLE;
        hadc1.Init.ContinuousConvMode = DISABLE;
        hadc1.Init.DiscontinuousConvMode = DISABLE;
        hadc1.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
        hadc1.Init.DataAlign = ADC_DATAALIGN_RIGHT;
        hadc1.Init.NbrOfConversion = 1;
        hadc1.Init.DMAContinuousRequests = DISABLE;
        hadc1.Init.EOCSelection = EOC_SINGLE_CONV;
        HAL_ADC_Init(&hadc1);

        sConfig.Channel = ADC_CHANNEL_10;
        sConfig.Rank = 1;
        sConfig.SamplingTime = ADC_SAMPLETIME_3CYCLES;
        HAL_ADC_ConfigChannel(&hadc1, &sConfig);
}

void HAL_ADC_MspInit(ADC_HandleTypeDef* hadc)
{
        GPIO_InitTypeDef GPIO_InitStruct;
        if(hadc->Instance==ADC1) {
                __ADC1_CLK_ENABLE();
  
                GPIO_InitStruct.Pin = GPIO_PIN_0;
                GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
                GPIO_InitStruct.Pull = GPIO_NOPULL;
                HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
        }
}

static int adc_register(struct st_device *dev, char *param)
{
        MX_ADC1_Init();

        return 0;
}

static int adc_open(struct st_device *dev)
{
        return 0;
}

static int adc_close(struct st_device *dev)
{
        return 0;
}

static int adc_read(struct st_device *dev, void *data, unsigned int size)
{
        unsigned int val;
        unsigned char *dp = data;
        long rtn = 0;

        HAL_ADC_Start(&hadc1);
        HAL_ADC_PollForConversion(&hadc1, 100);
        val = HAL_ADC_GetValue(&hadc1);
        HAL_ADC_Stop(&hadc1);

        if(size > 0) {
                *dp = ((val >> 8) & 0xff);
                dp ++;
                rtn ++;
        }

        if(size > 1) {
                *dp = (val & 0xff);
                rtn ++;
        }

        return rtn;
}

const struct st_device adc_device = {
        .name           = "adc",
        .explan         = "STM32F4 ADC(GPIO PC0)",
        .register_dev   = adc_register,
        .open           = adc_open,
        .close          = adc_close,
        .read           = adc_read,
};