/** ****************************************************************************** * Ten Tep : sht.c * Tac Gia : Nguyen Quy Nhat * Cong Ty : MinhHaGroup * Website : BanLinhKien.Vn * Phien Ban : V1.0.0 * Ngay : 31-07-2012 * Tom Tat : Dinh nghia cac ham dieu khien sht. * * ****************************************************************************** * Chu Y : Phai dinh nghia cac chan su dung cho sht vao file main.h * Vi Du: PIC AVR 8051#define SHT_DATA_IN PINB0 PINB.0 P2_0#define SHT_DATA_OUT PORTB0 PORTB.0 P2_0#define SHT_CLK PORTB1 PORTB.1 P2_1 Voi PIC va AVR can dinh nghia them huong du lieu. PIC AVR 8051#define SHT_DDR_DATA DDRB0 DDRB.0 P2_0 #define SHT_DDR_CLK DDRB1 DDRB.1 P2_1 ********************************************************************************/

/*********************************** VI DU ************************************ float nhiet_do,do_am; SHT_Init(SHT_14_12_BIT); SHT_ReadTemHumi(&nhiet_do,&do_am);*******************************************************************************/#include "sht.h"static uint8_t SHT_Resolution; /*******************************************************************************Noi Dung : Bat dau mot ket noi moi.Tham Bien : Khong.Tra Ve : Khong.********************************************************************************/void SHT_Start(){SHT_DDR_CLK = DDROUT; // SHT la chan raSHT_DDR_DATA = DDROUT; // Data la chan raSHT_DATA_OUT = 1;SHT_CLK = 0;SHT_CLK = 1;SHT_DATA_OUT = 0;SHT_CLK = 0;SHT_CLK = 1;SHT_DATA_OUT = 1;SHT_CLK = 0;} /*******************************************************************************Noi Dung : Reset ket noi moi.Tham Bien : Khong.Tra Ve : Khong.********************************************************************************/void SHT_ResetConection(){ uint8_t i; SHT_DDR_DATA = DDROUT; //Data la chan ra SHT_DATA_OUT=1; for (i=0; i 0; i /= 2) { SHT_CLK = 0; if(i & Data) SHT_DATA_OUT = 1; else SHT_DATA_OUT = 0; delay_us(1); SHT_CLK = 1; delay_us(1); } SHT_CLK = 0; SHT_DDR_DATA = DDRIN; // Data la chan vao delay_us(1); SHT_CLK = 1; delay_us(1); error = SHT_DATA_IN; SHT_CLK = 0; delay_ms(250);return(error);} /*******************************************************************************Noi Dung : Doc 1 Byte du lieu tu SHT.Tham Bien : ack: Gia tri ACK 0,1.Tra Ve : Khong.********************************************************************************/uint8_t SHT_ReadByte(uint8_t ack){uint8_t i, val = 0;SHT_DDR_DATA = DDRIN; // Data la chan vaofor(i = 0x80; i > 0; i /= 2){ SHT_CLK = 1; delay_us(1); if(SHT_DATA_IN) val = val | i; delay_us(1); SHT_CLK = 0;}SHT_DDR_DATA = DDROUT; // Data la chan radelay_us(1);SHT_DATA_OUT = ! ack;SHT_CLK = 1;delay_us(1);SHT_CLK = 0;return(val);} /*******************************************************************************Noi Dung : Khoi tao SHT.Tham Bien : resolution: gia tri do phan giai. - SHT_14_12_BIT - SHT_12_8_BITTra Ve : Khong.********************************************************************************/void SHT_Init(uint8_t resolution){ SHT_ResetConection(); SHT_WriteByte(SHT_STATUS_REG_W); delay_ms(300); SHT_WriteByte(resolution); SHT_Resolution=resolution;} /*******************************************************************************Noi Dung : Reset SHT.Tham Bien : Khong.Tra Ve : Khong.********************************************************************************/void SHT_ResetChip(){SHT_ResetConection();SHT_WriteByte(SHT_RESET);delay_ms(100);} /*******************************************************************************Noi Dung : Doc 16 bit du lieu tu SHT.Tham Bien : Command: Ma lenh yeu cau.Tra Ve : 16 bit du lieu.********************************************************************************/uint16_t SHT_ReadSenSor(uint8_t Command){uint8_t msb, lsb, crc;SHT_ResetConection();SHT_WriteByte(Command);while(SHT_DATA_IN);msb = SHT_ReadByte(SHT_ACK);lsb = SHT_ReadByte(SHT_ACK);crc = SHT_ReadByte(SHT_NOACK);return(((uint16_t) msb