sht10的驱动程序，寄存器版本的

shenqihao · 发表于 2016-7-3 13:58:34

网上找了下，大多库函数版本的，一直用寄存器版本的，就选篇改了下。分享出来大家可以参考下。头文件：

[mw_shl_code=c,true]#ifndef _sht10_h_
#define _sht10_h_
//PC4时钟引脚
//PC5信号引脚

//初始化传感器连接端口
void sht10_init(void);
//得到温湿度的值
void GetTemperatureHumidity(void);

#define UpdataTimeSht10                      2       //温湿度传感器跟新时间

#endif[/mw_shl_code]

.c文件[mw_shl_code=c,true]#include "sht10.h"
#include "delay.h"
#include "uart.h"

#define noACK 0                                              //用于判断是否结束SHT10通信
#define ACK 1                                                 //结束数据传输

#define STATUS_REG_W 0x06 // 000 0011 0
#define STATUS_REG_R 0x07 // 000 0011 1
#define MEASURE_TEMP 0x03 // 000 0001 1
#define MEASURE_HUMI 0x05 // 000 0010 1
#define RESET 0x1E       // 000 1111 0
#define SCLL GPIOC->ODR&=~(1<<4)             //时钟线输出低电平
#define SCLH GPIOC->ODR|=1<<4                               //时钟线输出高电平
#define SDAL GPIOC->ODR&=~(1<<5)             //数据线输出低电平
#define SDAH GPIOC->ODR|=1<<5                               //数据线输出高电平
#define ReadState() {GPIOC->CRL&=0xFF0FFFFF; GPIOC->CRL|=0x00800000; GPIOC->ODR&=~(1<<5);}//数据线改为读
#define WriteState(){GPIOC->CRL&=0xFF0FFFFF; GPIOC->CRL|=0x00300000;}                                                                                        //数据线改为写
#define DATA() (GPIOC->IDR>>5)&1             //读出数据线数据
enum{TEMP,HUMI};                                                                               //温度和湿度
u16 Temperature=0,Humidity=0;
u8 t[2];                                                                                                             //读取2个字节，用于保存温度或者湿度

//启动输出
void TransStart(void);
//通信复位
void ConnectionReset(void);
//读取温度或者湿度
char ReadByte(unsigned char ack);
//从高位开始发送
char WriteByte(unsigned char value);
char Measure(unsigned char *pCheckSum,unsigned char mode);

//初始化传感器连接端口
void sht10_init(void)
{
      RCC->APB2ENR |=1<<4;//使能端口PORTC口时钟

      GPIOC->CRL &=0xFF00FFFF;
      GPIOC->CRL |=0x00330000;//PORTC4、5推挽输出
      GPIOC->ODR &=~(1<<4);             //GPIOC4输出0
      GPIOC->ODR &=~(1<<5);             //GPIOC5输出0

      delay_ms(20);
      ConnectionReset();
      Temperature=0;
      Humidity=0;
}
//启动输出
//    _____       ________
// DATA:    |_______|
//          ___    ___
// SCK : ___| |___| |______
void TransStart(void)
{
      SDAH;
      SCLL;
      delay_us(1);
      SCLH;
      delay_us(1);
      SDAL;
      delay_us(1);
      SCLL;
      delay_us(1);
      SCLH;
      delay_us(1);
      SDAH;
      delay_us(1);
      SCLL;
      delay_us(1);
}

//通信复位: DATA-line=1 and at least 9 SCK cycles followed by transstart
//    _____________________________________________________       ________
// DATA:                                                    |_______|
//       _ _ _ _ _ _ _ _ _       ___    ___
// SCK : __| |__| |__| |__| |__| |__| |__| |__| |__| |______| |___| |______
void ConnectionReset(void)
{
      unsigned char i;
      SDAH;
      SCLL;
      delay_us(1);
      for(i=0;i<9;i++)
      {
                     SCLH;
                     delay_us(1);
                     SCLL;
                     delay_us(1);
      }
      TransStart();
}
//读取温度或者湿度
char ReadByte(unsigned char ack)
{
      unsigned char i,val=0;
      SDAH;
      ReadState();
      for(i=0x80;0<i;i/=2)//先读取的是高位
      {
                     SCLH;
                     delay_us(1);
                     if(DATA())
                     {
                              val=(val|i);
                     }
                     delay_us(1);
                     SCLL;
                     delay_us(1);
      }
      WriteState();
      if(ack==1)//发送确认
      {
                     SDAL;
      }
      else//不确认
      {
                     SDAH;
      }
      delay_us(1);
      SCLH;
      delay_us(1);
      SCLL;
      delay_us(1);
      SDAH;
      return val;
}
//从高位开始发送
char WriteByte(unsigned char value)
{
      unsigned char i,error=0;
      for(i=0x80;0<i;i/=2)
      {
            if(i&value)
            {
                     SDAH;
            }
            else
            {
                     SDAL;
            }
            SCLH;
            delay_us(1);
            SCLL;
      }
      SDAH;//release DATA-line
      SCLH;//clk #9 for ack
      delay_us(1);
      ReadState();
      error=DATA();//DATA在第9个上升沿将被SHT10自动下拉为低电平
      WriteState();
      delay_us(1);
      SCLL;
      SDAH;//release DATA-line
      return error;
}

char Measure(unsigned char *pCheckSum,unsigned char mode)
{
      unsigned char error=0;
      TransStart();
      switch(mode)
      {
                     case TEMP:
                     error+=WriteByte(MEASURE_TEMP);
                     break;
                     case HUMI:
                     error+=WriteByte(MEASURE_HUMI);
                     break;
                     default:
                     break;
      }
      ReadState();
      delay_us(320000);//320ms等待数据准备好
      if(DATA())// 超时 (约2 sec.)
      {
                     error+=1;
      }
      WriteState();
      t[0]=ReadByte(ACK);
      t[1]=ReadByte(ACK);
      *pCheckSum=ReadByte(noACK);
      return error;
}

//得到温湿度的值并显示
void GetTemperatureHumidity(void)
{
      unsigned char error,CheckSum;

      error=0;
      error+=Measure(&CheckSum,TEMP);
      if(error!=0)
      {
            ConnectionReset();
            return;
      }
      else
      {
            float tem;
            tem=((t[0]<<8)+t[1])*0.1-400.0;//计算温度值
            Temperature=tem;
            send_uart1(0x5A);                                                       //显示温度值
            send_uart1(0xA5);//起始
            send_uart1(0x05);//数据长度
            send_uart1(0x82);//指令
            send_uart1(0x02);
            send_uart1(0x70);//地址
            send_uart1((Temperature/256));
            send_uart1((Temperature%256));
      }
      error=0;
      error+=Measure(&CheckSum,HUMI);
      if(error!=0)
      {
            ConnectionReset();
            return;
      }
      else
      {
            double hum=(t[0]<<8)+t[1];
            hum=hum*(hum*(-0.000028))+hum*0.405-40;
            Humidity=hum;                                                       //计算温度值
            send_uart1(0x5A);                                     //显示湿度值
            send_uart1(0xA5);                                     //起始
            send_uart1(0x05);                                     //数据长度
            send_uart1(0x82);                                     //指令
            send_uart1(0x02);
            send_uart1(0x72);                                     //地址
            send_uart1((Humidity/256));
            send_uart1((Humidity%256));
      }
}
[/mw_shl_code]