peripheral-sample/adc_vol_sample.c

/*
 * Copyright (c) 2006-2018, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2018-11-29     misonyo      first implementation.
 */
/*
 * 程序清单：这是一个 ADC 设备使用例程
 * 例程导出了 adc_sample 命令到控制终端
 * 命令调用格式：adc_sample
 * 程序功能：通过 ADC 设备采样电压值并转换为数值。
*/

#include <rtthread.h>
#include <rtdevice.h>

#define ADC_DEV_NAME        "adc1"
#define ADC_DEV_CHANNEL     5

static int adc_vol_sample(int argc, char *argv[])
{
    rt_adc_device_t adc_dev;
    rt_uint32_t value, vol;
    rt_err_t ret = RT_EOK;

    /* 查找设备 */
    adc_dev = (rt_adc_device_t)rt_device_find(ADC_DEV_NAME);
    if (adc_dev == RT_NULL)
    {
        rt_kprintf("adc sample run failed! can't find %s device!\n", ADC_DEV_NAME);
        return RT_ERROR;
    }

    /* 使能设备 */
    ret = rt_adc_enable(adc_dev, ADC_DEV_CHANNEL);

    /* 读取数据 */
    value = rt_adc_read(adc_dev, ADC_DEV_CHANNEL);
    rt_kprintf("the value is :%d \n", value);

    /* 转换为对应电压值,3.3V对应12位最大值4096,数据精度乘以100保留2位小数 */
    vol = value * 330 / 4096;
    rt_kprintf("the voltage is :%d.%02d \n", vol / 100, vol % 100);

    /* 关闭设备 */
    ret = rt_adc_disable(adc_dev, ADC_DEV_CHANNEL);

    return ret;
}
/* 导出到 msh 命令列表中 */
MSH_CMD_EXPORT(adc_vol_sample, adc voltage convert sample);