N76E003_24L01/Home_Light_V0.1/Code/.svn/pristine/7c/7cf5af90447c5fe50d55d1009c8a9fd16025f03b.svn-base

C51 COMPILER V9.53.0.0   DHT11                                                             09/30/2018 11:45:29 PAGE 1   


C51 COMPILER V9.53.0.0, COMPILATION OF MODULE DHT11
OBJECT MODULE PLACED IN .\Output\DHT11.obj
COMPILER INVOKED BY: D:\Keil_v5\C51\BIN\C51.EXE ..\..\Code\User\Driver\DHT11.c LARGE OPTIMIZE(0,SPEED) BROWSE INCDIR(../
                    -../Code/Include;../../Code/User;../../Code/User/Common;../../Code/User/Driver) DEFINE(FOSC_160000=1) DEBUG OBJECTEXTEND 
                    -PRINT(.\Output\LST\DHT11.lst) TABS(2) OBJECT(.\Output\DHT11.obj)

line level    source

   1          /**
   2          * @File:       DHT11.c
   3          * @Author:     Kinve JQ
   4          * @Version:    V0.1
   5          * @Date:       2018.09.30
   6          * @Brief:       
   7          * @Modify:     
   8              2018.09.30.Kinve:1.创建文件
   9          **/
  10          
  11          #include "DHT11.h"
  12          
  13          #define delay_ms(ms)  Timer3_Delay1ms(ms)
  14          #define delay_us(us)  Timer3_Delay1us(us) //{u8 i; for(i=0;i<us;i++) {nop;}}
  15          
  16          DHT11_Data_TypeDef DHT11_Data;
  17          
  18          //全局变量定义区
  19          //***************************************************************************/
  20          //      //uchar       i;
  21          //      uchar    U8FLAG,k;
  22          //      uchar    U8count,U8temp;
  23          //      uchar    U8T_data_H,U8T_data_L,U8RH_data_H,U8RH_data_L,U8checkdata;
  24          //      uchar    U8T_data_H_temp,U8T_data_L_temp,U8RH_data_H_temp,U8RH_data_L_temp,U8checkdata_temp;
  25          //      uchar    U8comdata;
  26          //      uint   ReceiveHighByte;
  27          //      uint   ReceiveLowByte;
  28          //***************Global defination for DHT11 end****//
  29          
  30          void DHT11_PortIN ( void )
  31          {
  32   1      #if 0
                  GPIO_InitTypeDef  GPIO_InitStructure;
              
                  RCC_APB2PeriphClockCmd ( DHT11_IORCC, ENABLE );
              
                  //切换为输入口
                  GPIO_InitStructure.GPIO_Pin = DHT11_DATA_PIN;
                  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
                  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
                  GPIO_Init ( DHT11_PORT, &GPIO_InitStructure );
              #endif
  43   1      }
  44          void DHT11_PortOUT ( void )
  45          {
  46   1      #if 0
                  GPIO_InitTypeDef  GPIO_InitStructure;
              
                  RCC_APB2PeriphClockCmd ( DHT11_IORCC, ENABLE );
              
                  GPIO_InitStructure.GPIO_Pin = ( DHT11_DATA_PIN );
                  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;    //推挽输出
                  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
C51 COMPILER V9.53.0.0   DHT11                                                             09/30/2018 11:45:29 PAGE 2   

                  GPIO_Init ( DHT11_PORT, &GPIO_InitStructure );
              #endif  
  56   1      }
  57          
  58          /*
  59          1.主机L >18ms
  60          2.主机H 20-40us
  61          3.DHT     L 80us
  62          4.DHT     H 80us
  63          5.DHT   DATA....
  64          */
  65          static u8 _us = 0;
  66          unsigned char DHT11_Start ( void )
  67          {
  68   1      
  69   1          //主机开始信号
  70   1          /*
  71   1            低18ms->高30us->等待dht响应(拉低)
  72   1          */
  73   1          DHT11_PortOUT();
  74   1          DHT11_Out = 0;
  75   1          delay_ms ( 20 );    //触发开始,总线拉低要大于18ms
  76   1          DHT11_Out = 1;  //释放总线
  77   1          delay_us(30); //拉低 20-40uS 等待DHT11的低电平响应信号
  78   1      
  79   1          //dht响应
  80   1          /*
  81   1            正确，拉低(80us) ->拉高(80us)->传送数据
  82   1          */
  83   1          DHT11_PortIN(); //改为输入
  84   1      
  85   1        #if 0
                  //实际6
                  _us = 0;
              
                  while ( DHT11_In ) //低电平的响应信号，20-40uS
                  {
                      if ( ++_us > 40 )
                      {
                          return 0;
                      }
              
                      delay_us ( 1 );
                  }
                #endif
  99   1      
 100   1          //实际53
 101   1          _us = 0;
 102   1      
 103   1          while ( !DHT11_In ) //低电平的响应信号，80us
 104   1          {
 105   2              if ( ++_us > 80 )
 106   2              {
 107   3                  return 0;
 108   3              }
 109   2      
 110   2              delay_us ( 1 );
 111   2          }
 112   1      
 113   1          //实际54
 114   1          _us = 0;
 115   1      
C51 COMPILER V9.53.0.0   DHT11                                                             09/30/2018 11:45:29 PAGE 3   

 116   1          while ( DHT11_In ) //紧接着是80us的高电平数据准备信号
 117   1          {
 118   2              if ( ++_us > 80 )
 119   2              {
 120   3                  return 0;
 121   3              }
 122   2      
 123   2              delay_us ( 1 );
 124   2          }
 125   1      
 126   1          //拉低后DHT11会拉高总线80us,接着会开始传数据
 127   1      
 128   1          return 1;
 129   1      
 130   1      }
 131          
 132          
 133          /*
 134            传输数据:
 135            1.一次8bit
 136            2.
 137              开始(50us 低)->
 138              0:  26-28us 高+ (50us 低) = 80us
 139              1:  70us 高+ (50us 低) = 120us
 140          
 141            3.判断0/1，
 142              1. 26-28us < n <  26-28us+50us
 143              2. 0us < n < 70us
 144            即，
 145            延时35-40us，
 146            高 = 1，是70us的，需要延时40us
 147            低 = 0，是26-28us的
 148          
 149          */
 150          static uint8_t Read_Byte ( void )
 151          {
 152   1          u8 i, temp = 0xff;
 153   1      
 154   1          //开始必须是为低的50us 开始信号
 155   1          if ( !DHT11_In )
 156   1          {
 157   2              for ( i = 0; i < 8; i++ )
 158   2              {
 159   3                  //等待高电平,消耗50us
 160   3                  _us = 0;
 161   3      
 162   3                  while ( !DHT11_In )
 163   3                  {
 164   4                      if ( ++_us > 50 )
 165   4                      {
 166   5                          return temp;
 167   5                      }
 168   4      
 169   4                      delay_us ( 1 );
 170   4                  }
 171   3      
 172   3                  //等待低电平,真实数据的结束
 173   3                  _us = 0;
 174   3      
 175   3                  while ( DHT11_In )
 176   3                  {
 177   4                      if ( ++_us > 80 )
C51 COMPILER V9.53.0.0   DHT11                                                             09/30/2018 11:45:29 PAGE 4   

 178   4                      {
 179   5                          return temp;
 180   5                      }
 181   4      
 182   4                      delay_us ( 1 );
 183   4                  }
 184   3      
 185   3                  if ( _us >  37 ) //35-40us后仍为高电平表示数据“1”
 186   3                  {
 187   4                      temp |= ( uint8_t ) ( 0x01 << ( 7 - i ) ); //把第7-i位置1
 188   4                  }
 189   3                  else   //40us后为低电平表示数据“0”
 190   3                  {
 191   4                      temp &= ( uint8_t ) ~ ( 0x01 << ( 7 - i ) ); //把第7-i位置0
 192   4                  }
 193   3              }
 194   2          }
 195   1      
 196   1          return temp;
 197   1      }
 198          
 199          
 200          
 201          uint8_t DHT11_Read_Data ( DHT11_Data_TypeDef *DHT11_Data )
 202          {
 203   1          uint8_t  res;
 204   1          uint8_t  check_sum;
 205   1      
 206   1          if ( DHT11_Start() )  //判断是否已经响应
 207   1          {
 208   2              /*开始接收数据*/
 209   2              DHT11_Data->humi_int = Read_Byte();
 210   2              DHT11_Data->humi_deci = Read_Byte();
 211   2              DHT11_Data->temp_int = Read_Byte();
 212   2              DHT11_Data->temp_deci = Read_Byte();
 213   2              DHT11_Data->check_sum = Read_Byte();
 214   2      
 215   2              check_sum = DHT11_Data->humi_int + DHT11_Data->humi_deci + DHT11_Data->temp_int + DHT11_Data->temp
             -_deci;
 216   2      
 217   2              /*检查读取的数据是否正确*/
 218   2              if ( DHT11_Data->check_sum == check_sum )
 219   2              {
 220   3                  res = SUCCESS;
 221   3              }
 222   2              else
 223   2              {
 224   3                  res = ERROR;
 225   3              }
 226   2          }
 227   1          else
 228   1          {
 229   2              res = ERROR;
 230   2          }
 231   1      
 232   1          return res;
 233   1      }
 234          
 235          /********************* (C) COPYRIGHT Kinve JQ  *******END OF FILE ********/
 236          
 237          

C51 COMPILER V9.53.0.0   DHT11                                                             09/30/2018 11:45:29 PAGE 5   


MODULE INFORMATION:   STATIC OVERLAYABLE
   CODE SIZE        =    605    ----
   CONSTANT SIZE    =   ----    ----
   XDATA SIZE       =     13    ----
   PDATA SIZE       =   ----    ----
   DATA SIZE        =   ----    ----
   IDATA SIZE       =   ----    ----
   BIT SIZE         =   ----    ----
END OF MODULE INFORMATION.


C51 COMPILATION COMPLETE.  0 WARNING(S),  0 ERROR(S)