60 lines
1.8 KiB
C
60 lines
1.8 KiB
C
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/*
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* Copyright (c) 2006-2022, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2018-11-29 misonyo first implementation.
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*/
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/*
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* 程序清单： ADC 设备使用例程
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* 例程导出了 adc_sample 命令到控制终端
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* 命令调用格式：adc_sample
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* 程序功能：通过 ADC 设备采样电压值并转换为数值。
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* 示例代码参考电压为3.3V,转换位数为12位。
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*/
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#include <rtthread.h>
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#include <rtdevice.h>
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#define ADC_DEV_NAME "adc1" /* ADC 设备名称 */
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#define ADC_DEV_CHANNEL 18 /* ADC 通道 */
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#define REFER_VOLTAGE 330 /* 参考电压 3.3V,数据精度乘以100保留2位小数*/
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#define CONVERT_BITS (1 << 12) /* 转换位数为12位 */
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#define TEMP_DELTA 0//温度补偿
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static int adc_vol_sample(int argc, char *argv[])
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{
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rt_adc_device_t adc_dev;
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rt_uint32_t value, vol;
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rt_err_t ret = RT_EOK;
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/* 查找设备 */
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adc_dev = (rt_adc_device_t)rt_device_find(ADC_DEV_NAME);
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if (adc_dev == RT_NULL)
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{
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rt_kprintf("adc sample run failed! can't find %s device!\n", ADC_DEV_NAME);
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return RT_ERROR;
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}
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/* 使能设备 */
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ret = rt_adc_enable(adc_dev, ADC_DEV_CHANNEL);
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/* 读取采样值 */
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value = rt_adc_read(adc_dev, ADC_DEV_CHANNEL);
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rt_kprintf("the value is :%d \n", value);
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/* 转换为对应电压值 */
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vol = value * REFER_VOLTAGE / CONVERT_BITS;
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rt_kprintf("the voltage is :%d.%02d \n", vol / 100, vol % 100);
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rt_int32_t t = (int)(143-vol)/0.43+25;
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rt_kprintf("temp is %d ℃\n",t+TEMP_DELTA);
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/* 关闭通道 */
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ret = rt_adc_disable(adc_dev, ADC_DEV_CHANNEL);
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return ret;
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}
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/* 导出到 msh 命令列表中 */
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MSH_CMD_EXPORT(adc_vol_sample, adc voltage convert sample);
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