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： 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。 * 示例代码参考电压为3.3V,分辨率为12位。*/#include <rtthread.h>#include <rtdevice.h>#define ADC_DEV_NAME "adc1" /* ADC 设备名称 */#define ADC_DEV_CHANNEL 5 /* ADC 通道 */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); /* 读取采样值 */ 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); /* 关闭通道 */ 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);