87 lines
1.9 KiB
C
87 lines
1.9 KiB
C
#include "dht10.h"
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uint16_t dht10_data_temperature; // 温度 100 倍
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uint16_t dht10_data_humidity; // 湿度 100 倍
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void
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DHT10_Init ()
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{
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DelayUs (1);
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}
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void
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DHT10_ReadData ()
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{
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uint8_t i;
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uint8_t buffer[6] = { 0 };
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uint32_t hum_or_temp_raw;
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// 发送启动测量命令
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IIC_Start ();
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IIC_SendByte (DHT10_ADDR << 1); // 发送设备地址+写
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// 发送命令字节
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IIC_SendByte (0xAC);
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IIC_SendByte (0x33);
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IIC_SendByte (0x00);
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IIC_Stop ();
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// 等待测量完成（DHT10需至少75ms）
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DelayMs (80);
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// 读取6字节数据
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IIC_Start ();
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IIC_SendByte ((DHT10_ADDR << 1) | 1);
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for (i = 0; i < 6; i++)
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{
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buffer[i] = IIC_RecvByte ();
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// 前5字节发送Ack，第6字节发送NAck
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if (i < 5)
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IIC_SendAck (1);
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else
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IIC_SendAck (0);
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}
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IIC_Stop ();
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// 校验和：前5字节之和的低8位
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i = buffer[0] + buffer[1] + buffer[2] + buffer[3] + buffer[4];
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if (i != buffer[5])
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{
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return;
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}
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// 解析20位湿度数据（buffer[2]高4位为湿度数据）
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hum_or_temp_raw = ((uint32_t)buffer[0] << 12) | ((uint32_t)buffer[1] << 4)
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| (buffer[2] >> 4);
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// 转换为实际值
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// dht10_data->humidity = (float)hum_raw / 10.0f; // 湿度 实际值
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dht10_data_humidity = (uint16_t)(hum_or_temp_raw * 10.0f); // 湿度 100倍
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// 解析20位温度数据（buffer[5]高4位为温度数据）
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hum_or_temp_raw = ((uint32_t)buffer[3] << 12) | ((uint32_t)buffer[4] << 4)
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| (buffer[5] >> 4);
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dht10_data_temperature
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= (uint16_t)(hum_or_temp_raw * 10.0f) - 4000; // 温度 100倍
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// dht10_data->temperature = (float)temp_raw / 10.0f - 40.0f; // 温度
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// 实际值
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return;
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}
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uint16_t
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DHT10_GetTemperature ()
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{
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return dht10_data_temperature;
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}
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uint16_t
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DHT10_GetHumidity ()
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{
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return dht10_data_humidity;
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}
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