MSP430F149 采集温湿度传感器SHT10

/* **------------------------------------------------------------------------------------------------------ ** System Function: Sht10 Driver------温湿度传感器SHT10驱动 ** SCK: P4.5 ** SDA: P4.6 ** ********************************************************************************************************/ #include <msp430x14x.h> #include <string.h> /*宏定义，延时函数，参数为1时相应延时分别为1us和1ms*/ /*常量定义*/ #define uint unsigned int #define uchar unsigned char #define ulong unsigned long #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 bitselect 0x01 //选择温度与湿度的低位读 #define noACK 0 #define ACK 1 #define HUMIDITY 2 #define TEMPERATURE 1 #define SCK BIT0 #define SDA BIT1 #define SCK_H P2OUT|=SCK #define SCK_L P2OUT&=~SCK #define SDA_H P2OUT|=SDA #define SDA_L P2OUT&=~SDA #define MAX485ENABLE P2DIR|=BIT4 #define MAX485SEND P2OUT|=BIT4 #define MAX485REV P2OUT&=~BINT4 typedef union { unsigned int i; float f; }value; void delay_us( ulong n) { ulong i; for (i=0;i<n;i++) { asm("nop"); asm("nop"); } } void delay_ms( ulong n) { ulong i; for (i=0;i<n;i++) { delay_us(1000); } } uint table_temp[3]; uint table_humi[3]; uint temten; uint humi_true; int RecBuf[20] = {0}; int Rindex = 0; /********************************************************************************************************** **Function Name: S_Transstart **Description: 发送开始时序 ** ** generates a transmission start ** _____ ________ ** DATA: |_______| ** ___ ___ ** SCK : ___| |___| |______ **Input Parameters: 无 **Output Parameters: 无 **********************************************************************************************************/ void S_Transstart() { P2DIR|=SDA; SDA_H;SCK_L; delay_us(1); SCK_H; delay_us(1); SDA_L; delay_us(1); SCK_L; delay_us(1);delay_us(1);delay_us(1); SCK_H; delay_us(1); SDA_H; delay_us(1); SCK_L; P2DIR&=~SDA; } /********************************************************************************************************** **Function Name: S_WriteByte **Description: 写时序 **Input Parameters: 无 **Output Parameters: 无 **********************************************************************************************************/ char S_WriteByte(unsigned char value) { unsigned char i,error=0; P2DIR|=SDA; for(i=0x80;i>0;i/=2) //shift bit for masking { if(i&value) SDA_H; //masking value with i , write to SENSI-BUS else SDA_L; SCK_H; //clk for SENSI-BUS delay_us(1);delay_us(1);delay_us(1); //pulswith approx. 5 us SCK_L; } SDA_H; //release DATA-line P2DIR&=~SDA; //Change SDA to be input SCK_H; //clk #9 for ack error=P2IN; //check ack (DATA will be pulled down by SHT11) error&=SDA; P2DIR|=SDA; SCK_L; if(error) return 1; //error=1 in case of no acknowledge return 0; } /********************************************************************************************************** **Function Name: S_ReadByte **Description: 读时序 **Input Parameters: ack--->reads a byte form the Sensibus and gives an acknowledge in case of "ack=1" **Output Parameters: 无 **********************************************************************************************************/ char S_ReadByte(unsigned char ack) { unsigned char i,val=0; P2DIR|=SDA; SDA_H; //release DATA-line P2DIR&=~SDA; for(i=0x80;i>0;i/=2) //shift bit for masking { SCK_H; //clk for SENSI-BUS if(P2IN&SDA) val=(val|i); //read bit SCK_L; } P2DIR|=SDA; if(ack) //in case of "ack==1" pull down DATA-Line SDA_L; else SDA_H; SCK_H; //clk #9 for ack delay_us(1);delay_us(1);delay_us(1); //pulswith approx. 5 us SCK_L; SDA_H; //release DATA-line P2DIR&=~SDA; return val; } /********************************************************************************************************** **Function Name: S_Connectionreset **Description: 通讯复位时序 ** communication reset: DATA-line=1 and at least 9 SCK cycles followed by transstart ** _____________________________________________________ ________ ** DATA: |_______| ** _ _ _ _ _ _ _ _ _ ___ ___ ** SCK : __| |__| |__| |__| |__| |__| |__| |__| |__| |______| |___| |______ **Input Parameters: 无 **Output Parameters: 无 **********************************************************************************************************/ void S_Connectionreset() { unsigned char ClkCnt; P2DIR|=SDA; SDA_H;SCK_L; //Initial state for(ClkCnt=0;ClkCnt<9;ClkCnt++) //9 SCK cycles { SCK_H; SCK_L; } S_Transstart(); //transmission start } /********************************************************************* 软件复位时序resets the sensor by a softreset ********************************************************************/ char S_Softreset() { unsigned char error=0; S_Connectionreset(); //reset communication error+=S_WriteByte(RESET); //send RESET-command to sensor return error; //error=1 in case of no response form the sensor } /********************************************************************************************************** **Function Name: S_WriteStatusReg **Description: 写状态寄存器 **Input Parameters: *p_value **Output Parameters: 无 **********************************************************************************************************/ char S_WriteStatusReg(unsigned char *p_value) { unsigned char error=0; S_Transstart(); //transmission start error+=S_WriteByte(STATUS_REG_W); //send command to sensor error+=S_WriteByte(*p_value); //send value of status register return error; //error>=1 in case of no response form the sensor } /********************************************************************************************************** **Function Name: S_Mearsure **Description: 开始测量 makes a measurement (humidity/temperature) with checksum **Input Parameters: *p_value ,*p_checknum ,mode **Output Parameters: 无 **********************************************************************************************************/ unsigned char S_Measure(unsigned char *p_