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https://github.com/RT-Thread/rt-thread.git
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107 lines
3.2 KiB
C
107 lines
3.2 KiB
C
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/*
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* Copyright (c) 2022-2024, Xiaohua Semiconductor Co., Ltd.
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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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* 2024-12-30 CDT first version
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*/
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/*
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* 程序清单： DAC 设备使用例程
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* 例程导出了 dac_vol_sample 命令到控制终端
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* 命令调用格式：dac_vol_sample 参数1：dac1 | dac2 参数2：DAC配置值 （可选，范围0-4095），默认1365≈1.1V
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* 程序功能：通过 DAC 设备将数字值转换为模拟量，并输出电压值。将示波器通道连接到输出引脚，观察输出电压值
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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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#include <stdlib.h>
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#ifdef BSP_USING_DAC
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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 DAC_MAX_OUTPUT_VALUE 4095
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static int dac_vol_sample(int argc, char *argv[])
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{
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char dac_device_name[] = "dac1";
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rt_uint8_t channel = 1;
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rt_dac_device_t dac_dev;
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rt_uint32_t value = 1365; /* 默认1.1V */
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rt_uint32_t convertBits;
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rt_uint32_t vol;
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rt_err_t ret = RT_EOK;
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/* 参数无输入或者输入错误按照默认值处理 */
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if (argc >= 2)
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{
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if (0 == rt_strcmp(argv[1], "dac1"))
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{
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rt_strcpy(dac_device_name, "dac1");
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}
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#if defined (HC32F4A0) || defined (HC32F472)
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else if (0 == rt_strcmp(argv[1], "dac2"))
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{
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rt_strcpy(dac_device_name, "dac2");
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}
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#endif
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#if defined (HC32F472)
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else if (0 == rt_strcmp(argv[1], "dac3"))
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{
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rt_strcpy(dac_device_name, "dac3");
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}
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else if (0 == rt_strcmp(argv[1], "dac4"))
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{
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rt_strcpy(dac_device_name, "dac4");
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}
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#endif
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else
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{
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rt_kprintf("The chip hasn't the dac unit!\r\n");
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return -RT_ERROR;
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}
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}
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/* 查找设备 */
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dac_dev = (rt_dac_device_t)rt_device_find(dac_device_name);
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if (dac_dev == RT_NULL)
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{
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rt_kprintf("dac sample run failed! can't find %s device!\n", dac_device_name);
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return -RT_ERROR;
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}
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if (RT_EOK != rt_device_control(&dac_dev->parent, RT_DAC_CMD_GET_RESOLUTION, &convertBits))
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{
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rt_kprintf("dac sample can't read resolution!\n");
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return -RT_ERROR;
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}
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convertBits = (1 << (rt_uint8_t)convertBits);
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for (channel = 1; channel < 3; channel++)
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{
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/* 打开通道 */
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ret = rt_dac_enable(dac_dev, channel);
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/* 设置输出值 */
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if (argc >= 3)
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{
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value = atoi(argv[2]);
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if (value > DAC_MAX_OUTPUT_VALUE)
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{
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rt_kprintf("invalid dac value!!! \n");
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return -RT_ERROR;
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}
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}
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rt_dac_write(dac_dev, channel, value);
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rt_kprintf("%s CH%d Value is :%d \n", dac_device_name, channel, value);
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/* 转换为对应电压值 */
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vol = value * REFER_VOLTAGE / convertBits;
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rt_kprintf("%s CH%d Voltage is :%d.%02dV \n", dac_device_name, channel, vol / 100, vol % 100);
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}
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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(dac_vol_sample, dac voltage convert sample < dac1 | dac2 value >);
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#endif
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