標(biāo)題: Arduino軟件模擬RS485通信，雙線，半雙工 源程序 [打印本頁(yè)]
作者: LYC0512    時(shí)間: 2020-10-27 21:54
標(biāo)題: Arduino軟件模擬RS485通信，雙線，半雙工 源程序
  1. #include <Arduino.h>

  3. static unsigned char D_0 = 2;
  4. static unsigned char D_1 = 3;


  7. void rs_485_all_pin_high()
  8. {
  9.   digitalWrite(D_0,HIGH);
  10.   digitalWrite(D_1,HIGH);
  11. }

  13. void rs_485_all_pin_low()
  14. {
  15.   digitalWrite(D_0,LOW);
  16.   digitalWrite(D_1,LOW);
  17. }

  19. void rs_485_all_pin_logic_1()
  20. {
  21.   digitalWrite(D_0,LOW);
  22.   digitalWrite(D_1,HIGH);
  23. }

  25. void rs_485_all_pin_logic_0()
  26. {
  27.   digitalWrite(D_0,HIGH);
  28.   digitalWrite(D_1,LOW);
  29. }
  30. unsigned char rs_485_read_pin()
  31. {
  32.   unsigned char temp_rs_485_read_pin_value = digitalRead(D_0);
  33.   
  34.   return ((temp_rs_485_read_pin_value << 1) + digitalRead(D_1));
  35. }
  36. unsigned char rs_485_read_bit()
  37. {
  38.   unsigned char temp_from_485_read_pin_value = rs_485_read_pin();
  39.   
  40.   if(temp_from_485_read_pin_value == 0)// 0-0
  41.   {
  42.     return 2;
  43.   }
  44.   if(temp_from_485_read_pin_value == 1)//0-1
  45.   {
  46.     return 1;
  47.   }
  48.   if(temp_from_485_read_pin_value == 3)//1-1
  49.   {
  50.     return 3;
  51.   }
  52.   if(temp_from_485_read_pin_value == 2)//1-0
  53.   {
  54.     return 0;
  55.   }
  56. }



  60. void rs_485_write(unsigned char rs_485_write_value)
  61. {
  62.   unsigned char i = 0,time_write_delay = 80;
  63.   rs_485_all_pin_high();
  64.   
  65.   delayMicroseconds(time_write_delay);
  66.   
  67.   for(;i < 8; i++)
  68.   {
  69.     unsigned char temp_rs_485_write_value = (rs_485_write_value & 128);
  70.     if(temp_rs_485_write_value)
  71.     {
  72.       rs_485_all_pin_logic_1();
  73.     }
  74.     else if(temp_rs_485_write_value == 0)
  75.     {
  76.       rs_485_all_pin_logic_0();
  77.     }
  78.     rs_485_write_value = rs_485_write_value << 1;
  79.     delayMicroseconds(time_write_delay);
  80.   }
  81.   rs_485_all_pin_low();
  82. }
  83. unsigned char rs_485_read(unsigned int delay_time_485)
  84. {
  85.   unsigned char i=0,temp_read_value = 0;
  86.   
  87.   delayMicroseconds(110);
  88.   
  89.   for(;i<8;i++)
  90.   {
  91.     temp_read_value = ((temp_read_value << 1) + rs_485_read_bit());
  92.     delayMicroseconds(delay_time_485);
  93.   }
  94.   return temp_read_value;
  95. }

  97. unsigned char rs_485_test()
  98. {
  99.   if(rs_485_read_pin() == 0)
  100.   {
  101.     return 1;
  102.   }
  103.   else
  104.   {
  105.     return 0;
  106.   }
  107. }

  109. void rs_485_init()
  110. {
  111.   pinMode(D_0,INPUT);
  112.   pinMode(D_1,INPUT);
  113.   rs_485_all_pin_low();
  114. }
復(fù)制代碼

RS-485.rar (1.77 KB, 下載次數(shù): 21)


作者: bynaruto    時(shí)間: 2021-6-14 18:34
how can i apply in my code void main.... how to send the message
thanks in advance



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