2.8.2、SHT10.c驱动程序的编写
不废话了，直接贴代码：/*************************************************************
\(^o^)/
Copyright (C), 2013-2020, ZheJiang University of Technology
File name : SHT10.c
Author : ziye334
Version : V1.0
Data : 2014/3/10
Description: Digital temperature and humidity sensor driver code
*************************************************************/
#include "SHT10.h"
#include <math.h>
/*************************************************************
Function ：SHT10_Dly
Description：SHT10时序需要的延时
Input : none
return : none
*************************************************************/
void SHT10_Dly(void)
{
u16 i;
for(i = 500; i > 0; i--);
}
/*************************************************************
Function ：SHT10_Config
Description：初始化 SHT10引脚
Input : none
return : none
*************************************************************/
void SHT10_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
//初始化SHT10引脚时钟
RCC_APB2PeriphClockCmd(SHT10_AHB2_CLK ,ENABLE);
//PD0 DATA 推挽输出
GPIO_InitStructure.GPIO_Pin = SHT10_DATA_PIN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(SHT10_DATA_PORT, &GPIO_InitStructure);
//PD1 SCK 推挽输出
GPIO_InitStructure.GPIO_Pin = SHT10_SCK_PIN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(SHT10_SCK_PORT, &GPIO_InitStructure);
SHT10_ConReset(); //复位通讯
}
/*************************************************************
Function ：SHT10_DATAOut
Description：设置DATA引脚为输出
Input : none
return : none
*************************************************************/
void SHT10_DATAOut(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
//PD0 DATA 推挽输出
GPIO_InitStructure.GPIO_Pin = SHT10_DATA_PIN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(SHT10_DATA_PORT, &GPIO_InitStructure);
}
/*************************************************************
Function ：SHT10_DATAIn
Description：设置DATA引脚为输入
Input : none
return : none
*************************************************************/
void SHT10_DATAIn(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
//PD0 DATA 浮动输入
GPIO_InitStructure.GPIO_Pin = SHT10_DATA_PIN;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(SHT10_DATA_PORT, &GPIO_InitStructure);
}
/*************************************************************
Function ：SHT10_WriteByte
Description：写1字节
Input : value:要写入的字节
return : err: 0-正确 1-错误
*************************************************************/
u8 SHT10_WriteByte(u8 value)
{
u8 i, err = 0;
SHT10_DATAOut(); //设置DATA数据线为输出
for(i = 0x80; i > 0; i /= 2) //写1个字节
{
if(i & value)
SHT10_DATA_H();
else
SHT10_DATA_L();
SHT10_Dly();
SHT10_SCK_H();
SHT10_Dly();
SHT10_SCK_L();
SHT10_Dly();
}
SHT10_DATAIn(); //设置DATA数据线为输入,释放DATA线
SHT10_SCK_H();
err = SHT10_DATA_R(); //读取SHT10的应答位
SHT10_SCK_L();
return err;
}
/*************************************************************
Function ：SHT10_ReadByte
Description：读1字节数据
Input : Ack: 0-不应答 1-应答
return : err: 0-正确 1-错误
*************************************************************/
u8 SHT10_ReadByte(u8 Ack)
{
u8 i, val = 0;
SHT10_DATAIn(); //设置DATA数据线为输入
for(i = 0x80; i > 0; i /= 2) //读取1字节的数据
{
SHT10_Dly();
SHT10_SCK_H();
SHT10_Dly();
if(SHT10_DATA_R())
val = (val | i);
SHT10_SCK_L();
}
SHT10_DATAOut(); //设置DATA数据线为输出
if(Ack)
SHT10_DATA_L(); //应答，则会接下去读接下去的数据(校验数据)
else
SHT10_DATA_H(); //不应答，数据至此结束
SHT10_Dly();
SHT10_SCK_H();
SHT10_Dly();
SHT10_SCK_L();
SHT10_Dly();
return val; //返回读到的值
}
/*************************************************************
Function ：SHT10_TransStart
Description：开始传输信号，时序如下：
_____ ________
DATA: |_______|
___ ___
SCK : ___| |___| |______
Input : none
return : none
*************************************************************/
void SHT10_TransStart(void)
{
SHT10_DATAOut(); //设置DATA数据线为输出
SHT10_DATA_H();
SHT10_SCK_L();
SHT10_Dly();
SHT10_SCK_H();
SHT10_Dly();
SHT10_DATA_L();
SHT10_Dly();
SHT10_SCK_L();
SHT10_Dly();
SHT10_SCK_H();
SHT10_Dly();
SHT10_DATA_H();
SHT10_Dly();
SHT10_SCK_L();
}
/*************************************************************
Function ：SHT10_ConReset
Description：通讯复位，时序如下：
_____________________________________________________ ________
DATA: |_______|
_ _ _ _ _ _ _ _ _ ___ ___
SCK : __| |__| |__| |__| |__| |__| |__| |__| |__| |______| |___| |______
Input : none
return : none
*************************************************************/
void SHT10_ConReset(void)
{
u8 i;
SHT10_DATAOut();
SHT10_DATA_H();
SHT10_SCK_L();
for(i = 0; i < 9; i++) //触发SCK时钟9c次
{
SHT10_SCK_H();
SHT10_Dly();
SHT10_SCK_L();
SHT10_Dly();
}
SHT10_TransStart(); //启动传输
}
/*************************************************************
Function ：SHT10_SoftReset
Description：软复位
Input : none
return : err: 0-正确 1-错误
*************************************************************/
u8 SHT10_SoftReset(void)
{
u8 err = 0;
SHT10_ConReset(); //通讯复位
err += SHT10_WriteByte(SOFTRESET);//写RESET复位命令
return err;
}
/*************************************************************
Function ：SHT10_ReadStatusReg
Description：读状态寄存器
Input : p_value-读到的数据；p_checksun-读到的校验数据
return : err: 0-正确 0-错误
*************************************************************/
u8 SHT10_ReadStatusReg(u8 *p_value, u8 *p_checksum)
{
u8 err = 0;
SHT10_TransStart(); //开始传输
err = SHT10_WriteByte(STATUS_REG_R);//写STATUS_REG_R读取状态寄存器命令
*p_value = SHT10_ReadByte(ACK); //读取状态数据
*p_checksum = SHT10_ReadByte(noACK);//读取检验和数据
return err;
}
/*************************************************************
Function ：SHT10_WriteStatusReg
Description：写状态寄存器
Input : p_value-要写入的数据值
return : err: 0-正确 1-错误
*************************************************************/
u8 SHT10_WriteStatusReg(u8 *p_value)
{
u8 err = 0;
SHT10_TransStart(); //开始传输
err += SHT10_WriteByte(STATUS_REG_W);//写STATUS_REG_W写状态寄存器命令
err += SHT10_WriteByte(*p_value); //写入配置值
return err;
}
/*************************************************************
Function ：SHT10_Measure
Description：从温湿度传感器读取温湿度
Input : p_value-读到的值；p_checksum-读到的校验数
return : err: 0-正确 1—错误
*************************************************************/
u8 SHT10_Measure(u16 *p_value, u8 *p_checksum, u8 mode)
{
u8 err = 0;
u32 i;
u8 value_H = 0;
u8 value_L = 0;
SHT10_TransStart(); //开始传输
switch(mode)
{
case TEMP: //测量温度
err += SHT10_WriteByte(MEASURE_TEMP);//写MEASURE_TEMP测量温度命令
break;
case HUMI:
err += SHT10_WriteByte(MEASURE_HUMI);//写MEASURE_HUMI测量湿度命令
break;
default:
break;
}
SHT10_DATAIn();
for(i = 0; i < 72000000; i++) //等待DATA信号被拉低
{
if(SHT10_DATA_R() == 0) break; //检测到DATA被拉低了，跳出循环
}
if(SHT10_DATA_R() == 1) //如果等待超时了
err += 1;
value_H = SHT10_ReadByte(ACK);
value_L = SHT10_ReadByte(ACK);
*p_checksum = SHT10_ReadByte(noACK); //读取校验数据
*p_value = (value_H << 8) | value_L;
return err;
}
/*************************************************************
Function ：SHT10_Calculate
Description：计算温湿度的值
Input : Temp-从传感器读出的温度值；Humi-从传感器读出的湿度值
p_humidity-计算出的实际的湿度值；p_temperature-计算出的实际温度值
return : none
*************************************************************/
void SHT10_Calculate(u16 t, u16 rh, float *p_temperature, float *p_humidity)
{
const float d1 = -39.7;
const float d2 = +0.01;
const float C1 = -2.0468;
const float C2 = +0.0367;
const float C3 = -0.0000015955;
const float T1 = +0.01;
const float T2 = +0.00008;
float RH_Lin; //RH线性值
float RH_Ture; //RH真实值
float temp_C;
temp_C = d1 + d2 * t; //计算温度值
RH_Lin = C1 + C2 * rh + C3 * rh * rh; //计算湿度值
RH_Ture = (temp_C -25) * (T1 + T2 * rh) + RH_Lin; //湿度的温度补偿，计算实际的湿度值
if(RH_Ture > 100) //设置湿度值上限
RH_Ture = 100;
if(RH_Ture < 0.1)
RH_Ture = 0.1; //设置湿度值下限
*p_humidity = RH_Ture;
*p_temperature = temp_C;
}
/*************************************************************
Function ：SHT10_CalcuDewPoint
Description：计算露点
Input : h-实际的湿度；t-实际的温度
return : dew_point-露点
*************************************************************/
float SHT10_CalcuDewPoint(float t, float h)
{
float logEx, dew_point;
logEx = 0.66077 + 7.5 * t / (237.3 + t) + (log10(h) - 2);
dew_point = ((0.66077 - logEx) * 237.3) / (logEx - 8.16077);
return dew_point;
}
2.8.3、main函数的编写：
int main(void)
{
u16 humi_val, temp_val;
u8 err = 0, checksum = 0;
float humi_val_real = 0.0;
float temp_val_real = 0.0;
float dew_point = 0.0;
BSP_Init();
printf("\nSHT10温室度测试程序!!!\n");
SHT10_Config();
while(1)
{
err += SHT10_Measure(&temp_val, &checksum, TEMP); //获取温度测量值
err += SHT10_Measure(&humi_val, &checksum, HUMI); //获取湿度测量值
if(err != 0)
SHT10_ConReset();
else
{
SHT10_Calculate(temp_val, humi_val, &temp_val_real, &humi_val_real); //计算实际的温湿度值
dew_point = SHT10_CalcuDewPoint(temp_val_real, humi_val_real); //计算露点温度
}
printf("当前环境温度为:%2.1f℃，湿度为:%2.1f%%，露点温度为%2.1f℃\r\n", temp_val_real, humi_val_real, dew_point);
LED1_Toggle();
Delay_ms(1000);
}
}
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