mykey.c

   1 /* Keyboard example with debug channel, for Teensy USB Development Board
   2  * http://www.pjrc.com/teensy/usb_keyboard.html
   3  * Copyright (c) 2008 PJRC.COM, LLC
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a copy
   6  * of this software and associated documentation files (the "Software"), to deal
   7  * in the Software without restriction, including without limitation the rights
   8  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   9  * copies of the Software, and to permit persons to whom the Software is
  10  * furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included in
  13  * all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  18  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  21  * THE SOFTWARE.
  22  */
  23
  24 #include <avr/io.h>
  25 #include <avr/pgmspace.h>
  26 #include <avr/interrupt.h>
  27 #include <util/delay.h>
  28 #include "usb_keyboard_debug.h"
  29 #include "print.h"
  30
  31 #define LED_CONFIG      (DDRD |= (1<<6))
  32 #define LED_ON          (PORTD &= ~(1<<6))
  33 #define LED_OFF         (PORTD |= (1<<6))
  34 #define CPU_PRESCALE(n) (CLKPR = 0x80, CLKPR = (n))
  35
  36 uint8_t number_keys[10]=
  37         {KEY_0,KEY_1,KEY_2,KEY_3,KEY_4,KEY_5,KEY_6,KEY_7,KEY_8,KEY_9};
  38
  39 uint16_t idle_count=0;
  40
  41 int main(void)
  42 {
  43         uint8_t b, d, mask, i, reset_idle;
  44         uint8_t b_prev=0xFF, d_prev=0xFF;
  45
  46         // set for 16 MHz clock
  47         CPU_PRESCALE(0);
  48
  49         // Configure all port B and port D pins as inputs with pullup resistors.
  50         // See the "Using I/O Pins" page for details.
  51         // http://www.pjrc.com/teensy/pins.html
  52         DDRD = 0x00;
  53         DDRB = 0x00;
  54         PORTB = 0xFF;
  55         PORTD = 0xFF;
  56
  57         // Initialize the USB, and then wait for the host to set configuration.
  58         // If the Teensy is powered without a PC connected to the USB port,
  59         // this will wait forever.
  60         usb_init();
  61         while (!usb_configured()) /* wait */ ;
  62
  63         // Wait an extra second for the PC's operating system to load drivers
  64         // and do whatever it does to actually be ready for input
  65         _delay_ms(1000);
  66
  67         // Configure timer 0 to generate a timer overflow interrupt every
  68         // 256*1024 clock cycles, or approx 61 Hz when using 16 MHz clock
  69         // This demonstrates how to use interrupts to implement a simple
  70         // inactivity timeout.
  71         TCCR0A = 0x00;
  72         TCCR0B = 0x05;
  73         TIMSK0 = (1<<TOIE0);
  74
  75         print("Begin keyboard example program\n");
  76         print("All Port B or Port D pins are inputs with pullup resistors.\n");
  77         print("Any connection to ground on Port B or D pins will result in\n");
  78         print("keystrokes sent to the PC (and debug messages here).\n");
  79         while (1) {
  80                 // read all port B and port D pins
  81                 b = PINB;
  82                 d = PIND;
  83                 // check if any pins are low, but were high previously
  84                 mask = 1;
  85                 reset_idle = 0;
  86                 for (i=0; i<8; i++) {
  87                         if (((b & mask) == 0) && (b_prev & mask) != 0) {
  88                                 //usb_keyboard_press(KEY_B, KEY_SHIFT);
  89                                 //usb_keyboard_press(number_keys[i], 0);
  90                                 print("Port B, bit ");
  91                                 phex(i);
  92                                 print("\n");
  93                                 reset_idle = 1;
  94                         }
  95                         if (((d & mask) == 0) && (d_prev & mask) != 0) {
  96                                 //usb_keyboard_press(KEY_D, KEY_SHIFT);
  97                                 //usb_keyboard_press(number_keys[i], 0);
  98                                 print("Port D, bit ");
  99                                 phex(i);
 100                                 print("\n");
 101                                 reset_idle = 1;
 102                         }
 103                         mask = mask << 1;
 104                 }
 105                 // if any keypresses were detected, reset the idle counter
 106                 if (reset_idle) {
 107                         // variables shared with interrupt routines must be
 108                         // accessed carefully so the interrupt routine doesn't
 109                         // try to use the variable in the middle of our access
 110                         cli();
 111                         idle_count = 0;
 112                         sei();
 113                 }
 114                 // now the current pins will be the previous, and
 115                 // wait a short delay so we're not highly sensitive
 116                 // to mechanical "bounce".
 117                 b_prev = b;
 118                 d_prev = d;
 119                 _delay_ms(2);
 120         }
 121 }
 122
 123 // This interrupt routine is run approx 61 times per second.
 124 // A very simple inactivity timeout is implemented, where we
 125 // will send a space character and print a message to the
 126 // hid_listen debug message window.
 127 ISR(TIMER0_OVF_vect)
 128 {
 129         idle_count++;
 130         if (idle_count > 61 * 8) {
 131                 idle_count = 0;
 132                 print("Timer Event :)\n");
 133                 //usb_keyboard_press(KEY_SPACE, 0);
 134         }
 135 }
 136
 137