基于C8051F410的am2305温湿度传感器的驱动编写

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这个和那个DHT11差不多，精度稍高一点，价格相差十倍呢。程序很有改进，中间如果连线出问题则会自动恢复。
直接上程序吧。
#include <C8051F410.h>                 // SFR declarations#include <stdio.h>#define SYSCLK        24500000         // SYSCLK frequency in Hz#define BAUDRATE      9600           // Baud rate of UART in bps#define WAIT  50000sbit led1 = P2^1;sbit led2 = P2^3;sbit dht_dat = P0^6;void Oscillator_Init (void);void Port_Init(void);void UART0_Init (void);void delay(unsigned int m);void delay_ms(unsigned int m);void read_am2305(void);void main (void){   PCA0MD &= ~0x40;                    // WDTE = 0 (clear watchdog timer                                       // enable)   Oscillator_Init ();                 // Initialize system clock to                                       // 24.5MHz   Port_Init();   UART0_Init();                       // Initialize UART0 for printf's   EA = 1;                             // Enable global interrupts   printf("初始化完成！\n\n");   //delay_ms(5000);   led1 = 1;   led2 = 1;   dht_dat = 1;   while (1)   {   delay_ms(1000);read_am2305();   }}void Oscillator_Init (void){   OSCICN = 0x87;                      // Configure internal oscillator for                                       // its highest frequency   RSTSRC = 0x04;                      // Enable missing clock detector}void Port_Init (void){   P1SKIP |= 0x40;                      // Skip all analog pins   XBR0 = 0x01;                        // UART0 TX and RX pins enabled   XBR1 = 0x40;                        // Enable crossbar and weak pull-ups   P0MDOUT |= 0x10;                    // Enable TX0 as a push-pull output}void UART0_Init (void){   SCON0 = 0x10;                       // SCON0: 8-bit variable bit rate                                       //        level of STOP bit is ignored                                       //        RX enabled                                       //        ninth bits are zeros                                       //        clear RI0 and TI0 bits   if (SYSCLK/BAUDRATE/2/256 < 1) {      TH1 = -(SYSCLK/BAUDRATE/2);      CKCON |=  0x08;                  // T1M = 1; SCA1:0 = xx   } else if (SYSCLK/BAUDRATE/2/256 < 4) {      TH1 = -(SYSCLK/BAUDRATE/2/4);      CKCON &= ~0x0B;                  // T1M = 0; SCA1:0 = 01      CKCON |=  0x01;   } else if (SYSCLK/BAUDRATE/2/256 < 12) {      TH1 = -(SYSCLK/BAUDRATE/2/12);      CKCON &= ~0x0B;                  // T1M = 0; SCA1:0 = 00   } else if (SYSCLK/BAUDRATE/2/256 < 48) {      TH1 = -(SYSCLK/BAUDRATE/2/48);      CKCON &= ~0x0B;                  // T1M = 0; SCA1:0 = 10      CKCON |=  0x02;   } else {      while (1);                       // Error.  Unsupported baud rate   }   TL1 = TH1;                          // Init Timer1   TMOD &= ~0xF0;                      // TMOD: timer 1 in 8-bit autoreload   TMOD |=  0x20;   TR1 = 1;                            // START Timer1   TI0 = 1;                            // Indicate TX0 ready}void delay(unsigned int m){while(m--);}void delay_ms(unsigned int m){while(m--)delay(2046);}unsigned char am2305_byte(void){unsigned char tmp1=0,wei=0;unsigned int cnt;for (wei=0;wei<8;wei++){tmp1*=2;delay(90);cnt=0;while(0==dht_dat){cnt++;if(cnt>WAIT){printf("\n传输错误1");return 0;}}delay(60);if(1==dht_dat){tmp1++;cnt=0;delay(80);while(1==dht_dat){cnt++;if(cnt>WAIT){printf("\n传输错误2");return 0;}}}}return tmp1;}void read_am2305(void){unsigned char wei=0;unsigned char humi_int=0,humi_float=0,temp_int=0,temp_float=0,chk_dat=0;float temp,humi;unsigned int cnt;dht_dat=1;printf("\n\n\n开始发送请求。\n");delay_ms(5);dht_dat=0;delay_ms(1);dht_dat=1;delay(40);cnt=0;while(1==dht_dat){cnt++;if(cnt>WAIT){printf("\n传感器未响应1。");return;}}//printf("下位机已响应--当前低电平。\n");delay(160);cnt=0;while(0==dht_dat){cnt++;if(cnt>WAIT){printf("\n传感器未响应2。");return;}}//printf("下位机已响应--当前高电平。\n");delay(160);cnt=0;while(1==dht_dat){cnt++;if(cnt>WAIT){printf("\n传感器未响应3。");return;}}//printf("下位机开始传送数据\n");//开始接收数据//湿度整数接受完成humi_int=am2305_byte();humi_float=am2305_byte();temp_int=am2305_byte();temp_float=am2305_byte();chk_dat=am2305_byte();humi=(float)((humi_int*256+humi_float)*0.1);temp=(float)(((temp_int & 0x7f)*256+temp_float)*0.1);if (temp_int & 0x80)temp=-temp;printf("湿度为：%2.1f%%。\n",humi);printf("温度为：%2.1f。\n",temp);printf("校验码为：%d\n",(int)chk_dat);// putchar('A');// scanf("%c",wei);// printf("\nyour input is:%d",(int)wei);if(chk_dat==(char)(humi_int+humi_float+temp_int+temp_float))printf("校验无误。\n",wei);elseprintf("校验出错。\n");delay_ms(2500);}