arduino/ps2_keyboard_test/ps2_keyboard_test.ino

   1 //Source: http://dduino.blogspot.com/2011/11/arduino-ps2-emulator-computer-control.html
   2
   3 //KBD stuff
   4 #include "ps2dev.h"  // to emulate a PS/2 device
   5 PS2dev keyboard(19,18);  // PS2dev object (2:data, 3:clock)
   6 int enabled = 0;  // pseudo variable for state of "keyboard"
   7 unsigned char c;  //char stores data recieved from computer for KBD
   8
   9 //Sonar stuff
  10
  11 void ack()
  12 {
  13   //acknowledge commands
  14   while(keyboard.write(0xFA));
  15 }
  16
  17 int keyboardcommand(int command)
  18 {
  19   unsigned char val;
  20   switch (command)
  21   {
  22   case 0xFF: //reset
  23     ack();
  24     //the while loop lets us wait for the host to be ready
  25     while(keyboard.write(0xAA)!=0);
  26     break;
  27   case 0xFE: //resend
  28     ack();
  29     break;
  30   case 0xF6: //set defaults
  31     //enter stream mode
  32     ack();
  33     break;
  34   case 0xF5: //disable data reporting
  35     //FM
  36     enabled = 0;
  37     ack();
  38     break;
  39   case 0xF4: //enable data reporting
  40     //FM
  41     enabled = 1;
  42     ack();
  43     break;
  44   case 0xF3: //set typematic rate
  45     ack();
  46     keyboard.read(&val); //do nothing with the rate
  47     ack();
  48     break;
  49   case 0xF2: //get device id
  50     ack();
  51     keyboard.write(0xAB);
  52     keyboard.write(0x83);
  53     break;
  54   case 0xF0: //set scan code set
  55     ack();
  56     keyboard.read(&val); //do nothing with the rate
  57     ack();
  58     break;
  59   case 0xEE: //echo
  60     //ack();
  61     keyboard.write(0xEE);
  62     break;
  63   case 0xED: //set/reset LEDs
  64     ack();
  65     keyboard.read(&val); //do nothing with the rate
  66     Serial.print("LEDs: ");
  67     Serial.println(val, HEX);
  68     digitalWrite(LED_BUILTIN, val);
  69     ack();
  70     break;
  71   }
  72   return 0;
  73 }
  74
  75 void setup()
  76 {
  77   // send the keyboard start up
  78   while(keyboard.write(0xAA)!=0);
  79   delay(10);
  80   // initialize the serial port:
  81   Serial.begin(9600);
  82   pinMode(LED_BUILTIN, OUTPUT);
  83 }
  84
  85 void loop()
  86 {
  87   //if host device wants to send a command:
  88   if(keyboard.available())
  89   {
  90     while(keyboard.read(&c));
  91     //delay(100);
  92     keyboardcommand(c);
  93     //delay(100);
  94     //c = 0;
  95   }
  96
  97
  98     delay(1000);
  99
 100     keyboard.write(0x16);
 101     keyboard.write(0xF0);
 102     keyboard.write(0x16);
 103     Serial.print('.');
 104
 105     //delay(1000);
 106
 107
 108 }