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#include "dht11.h" |
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#include "delay.h" |
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void DHT11_IO_IN(void) |
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{ |
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GPIO_InitTypeDef GPIO_InitStructure; |
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); //ʹ<EFBFBD><EFBFBD>PB<EFBFBD>˿<EFBFBD>ʱ<EFBFBD><EFBFBD> |
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15; //PG11<EFBFBD>˿<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> |
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; // |
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; |
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GPIO_Init(GPIOB, &GPIO_InitStructure); //<EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD>IO<EFBFBD><EFBFBD> |
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} |
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void DHT11_IO_OUT(void) |
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{ |
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GPIO_InitTypeDef GPIO_InitStructure; |
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); //ʹ<EFBFBD><EFBFBD>PB<EFBFBD>˿<EFBFBD>ʱ<EFBFBD><EFBFBD> |
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15; //PG11<EFBFBD>˿<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> |
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; // |
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; |
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GPIO_Init(GPIOB, &GPIO_InitStructure); //<EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD>IO<EFBFBD><EFBFBD> |
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} |
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//<EFBFBD><EFBFBD>λDHT11 |
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void DHT11_Rst(void) |
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{ |
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DHT11_IO_OUT(); //SET OUTPUT |
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DHT11_DQ_OUT=0; //<EFBFBD><EFBFBD><EFBFBD><EFBFBD>DQ54<EFBFBD><EFBFBD>ˮ<EFBFBD><EFBFBD> |
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delay_ms(20); //<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>18ms |
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DHT11_DQ_OUT=1; //DQ=1 |
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delay_us(30); //<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>20~40us |
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} |
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//<EFBFBD>ȴ<EFBFBD>DHT11<EFBFBD>Ļ<EFBFBD>Ӧ |
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//<EFBFBD><EFBFBD><EFBFBD><EFBFBD>1:δ<EFBFBD><EFBFBD>DHT11<EFBFBD>Ĵ<EFBFBD><EFBFBD><EFBFBD> |
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//<EFBFBD><EFBFBD><EFBFBD><EFBFBD>0:<EFBFBD><EFBFBD><EFBFBD><EFBFBD> |
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u8 DHT11_Check(void) |
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{ |
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u8 retry=0; |
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DHT11_IO_IN();//SET INPUT |
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while (DHT11_DQ_IN&&retry<100)//DHT11<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>40~80us |
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{ |
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retry++; |
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delay_us(1); |
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}; |
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if(retry>=100)return 1; |
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else retry=0; |
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while (!DHT11_DQ_IN&&retry<100)//DHT11<EFBFBD><EFBFBD><EFBFBD>ͺ<EFBFBD><EFBFBD><EFBFBD>ٴ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>40~80us |
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{ |
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retry++; |
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delay_us(1); |
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}; |
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if(retry>=100)return 1; |
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return 0; |
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} |
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//<EFBFBD><EFBFBD>DHT11<EFBFBD><EFBFBD>ȡһ<EFBFBD><EFBFBD>λ |
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//<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ<EFBFBD><EFBFBD>1/0 |
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u8 DHT11_Read_Bit(void) |
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{ |
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u8 retry=0; |
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while(DHT11_DQ_IN&&retry<100)//<EFBFBD>ȴ<EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD>͵<EFBFBD>ƽ |
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{ |
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retry++; |
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delay_us(1); |
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} |
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retry=0; |
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while(!DHT11_DQ_IN&&retry<100)//<EFBFBD>ȴ<EFBFBD><EFBFBD><EFBFBD>ߵ<EFBFBD>ƽ |
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{ |
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retry++; |
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delay_us(1); |
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} |
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delay_us(40);//<EFBFBD>ȴ<EFBFBD>40us |
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if(DHT11_DQ_IN)return 1; |
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else return 0; |
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} |
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//<EFBFBD><EFBFBD>DHT11<EFBFBD><EFBFBD>ȡһ<EFBFBD><EFBFBD><EFBFBD>ֽ<EFBFBD> |
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//<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> |
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u8 DHT11_Read_Byte(void) |
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{ |
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u8 i,dat; |
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dat=0; |
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for (i=0;i<8;i++) |
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{ |
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dat<<=1; |
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dat|=DHT11_Read_Bit(); |
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} |
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return dat; |
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} |
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//<EFBFBD><EFBFBD>DHT11<EFBFBD><EFBFBD>ȡһ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> |
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//temp:<EFBFBD>¶<EFBFBD>ֵ(<EFBFBD><EFBFBD>Χ:0~50<EFBFBD><EFBFBD>) |
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//humi:ʪ<EFBFBD><EFBFBD>ֵ(<EFBFBD><EFBFBD>Χ:20%~90%) |
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//<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ<EFBFBD><EFBFBD>0,<EFBFBD><EFBFBD><EFBFBD><EFBFBD>;1,<EFBFBD><EFBFBD>ȡʧ<EFBFBD><EFBFBD> |
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u8 DHT11_Read_Data(u8 *temp,u8 *humi) |
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{ |
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u8 buf[5]; |
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u8 i; |
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DHT11_Rst(); |
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if(DHT11_Check()==0) |
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{ |
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for(i=0;i<5;i++)//<EFBFBD><EFBFBD>ȡ40λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD> |
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{ |
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buf[i]=DHT11_Read_Byte(); |
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} |
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if((buf[0]+buf[1]+buf[2]+buf[3])==buf[4]) |
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{ |
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*humi=buf[0]; |
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*temp=buf[2]; |
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} |
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}else return 1; |
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return 0; |
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} |
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//<EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD>DHT11<EFBFBD><EFBFBD>IO<EFBFBD><EFBFBD> DQ ͬʱ<EFBFBD><EFBFBD><EFBFBD>DHT11<EFBFBD>Ĵ<EFBFBD><EFBFBD><EFBFBD> |
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//<EFBFBD><EFBFBD><EFBFBD><EFBFBD>1:<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> |
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//<EFBFBD><EFBFBD><EFBFBD><EFBFBD>0:<EFBFBD><EFBFBD><EFBFBD><EFBFBD> |
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u8 DHT11_Init(void) |
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{ |
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GPIO_InitTypeDef GPIO_InitStructure; |
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RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); //ʹ<EFBFBD><EFBFBD>PB<EFBFBD>˿<EFBFBD>ʱ<EFBFBD><EFBFBD> |
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15; //PG11<EFBFBD>˿<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> |
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> |
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; |
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GPIO_Init(GPIOB, &GPIO_InitStructure); //<EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD>IO<EFBFBD><EFBFBD> |
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GPIO_SetBits(GPIOB,GPIO_Pin_15); //PG11 <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> |
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DHT11_Rst(); //<EFBFBD><EFBFBD>λDHT11 |
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return DHT11_Check();//<EFBFBD>ȴ<EFBFBD>DHT11<EFBFBD>Ļ<EFBFBD>Ӧ |
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} |
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