DHT11(国外英文资料).docVIP

DHT11(国外英文资料) Temperature and humidity measurement system /********************** *********************/ #include msp430g2553.h #define DHT11_OUTPUT P2DIR|=BIT0 / / P2.0 temperature and humidity sensor, following a series of macro definition #define DHT11_INPUT P2DIR=~BIT0 #define DHT11_H P2OUT|=BIT0 #define DHT11_L P2OUT=~BIT0 #define DHT11_IN (P2INBIT0) #define uchar unsigned char #define uint unsigned int #define ulong unsigned long #define CPU (1000000) #define delay_us (x) (__delay_cycles ((double) x*CPU/1000000.0)) #define delay_ms (x) (__delay_cycles ((double) x*CPU/1000.0)) Uchar start_DHT11 (void); Uchar DHT11_ReadChar (void); Void DHT11 (void); Uchar, DHT11T_Data_H, DHT11T_Data_L, DHT11RH_Data_H, DHT11RH_Data_L, CheckData_temp; /************/ #define SENDCOMM 0XF8 //0XF1000 #define SENDDATA 0XFA //0XF1010 #define uchar unsigned char #define uint unsigned int #define E_CLK_0 P1OUT ~BIT5 //12864 E = pin P1.5 #define E_CLK_1 P1OUT |=BIT5 #define RW_SID_0 P1OUT ~BIT4 //12864 RW = pin P1.4 #define RW_SID_1 P1OUT BIT4 |= Void LCD_send_byte (unsigned, char, a); Unsigned char LCD_read_byte (void); Void LCD_comm (unsigned, char, comm); Void LCD_setxy (unsigned, char, x, unsigned, char, y); Void LCD_WriteStr (unsigned, char, dis_addr_x, unsigned, char, dis_addr_y, char*, STR); Void LCD_init (void); Void change (float a); Float ad_value; Float temp_value; Char, Qian, Ge, Shi, bai; Void _delay_cycles (unsigned, long, XMS) { Uint q; For (q=xms; q0; q--); } /**************** send byte function *****************/ Void LCD_send_byte (unsigned, char, a) { Unsigned char i; For (i=8; i0; i--) { If (a (0x01 (i-1)) { RW_SID_1; } Else { RW_SID_0; } _delay_cycles (100); E_CLK_1; _delay_cycles (100); E_CLK_0; _delay_cycles (100); } } /**************** bytes read function *****************/ Unsigned char LCD_read_byte (void) { Unsigned, char, I, dat=0; For (i=8; i0; i--) { E_CLK_1; _delay_cycles (100); If (RW_SID_1) Dat|= (0x01 (i-1)); E_CLK_0; _delay_cycles (100); } Return dat; }