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 #include "keymap.h"
  31
  32 #define LED_CONFIG      (DDRD |= (1<<6))
  33 #define LED_ON          (PORTD &= ~(1<<6))
  34 #define LED_OFF         (PORTD |= (1<<6))
  35 #define CPU_PRESCALE(n) (CLKPR = 0x80, CLKPR = (n))
  36
  37 uint8_t number_keys[10]=
  38         {KEY_0,KEY_1,KEY_2,KEY_3,KEY_4,KEY_5,KEY_6,KEY_7,KEY_8,KEY_9};
  39
  40 uint16_t idle_count=0;
  41
  42
  43
  44 //
  45 // scan matrix
  46 //
  47 uint8_t MAX_ROW = 9;
  48
  49 // initialize ports for matrix
  50 void port_setup(void)
  51 {
  52         // Column: input w/pullup
  53         DDRB = 0x00;
  54         PORTB = 0xFF;
  55
  56         // Row: Hi-Z(unselected)
  57         // PD:0,1,2,3,6,7
  58         // PC:6,7
  59         // PF:7
  60         DDRD = 0x00;
  61         PORTD = 0x00;
  62         DDRC = 0x00;
  63         PORTC = 0x00;
  64         DDRF = 0x00;
  65         PORTF = 0x00;
  66 }
  67
  68 // select a row of matrix for read
  69 void select_row(uint8_t row)
  70 {
  71     switch (row) {
  72         case 0:
  73             DDRD  = (1<<0);
  74             PORTD = 0x00;
  75             DDRC  = 0x00;
  76             PORTC = 0x00;
  77             DDRF  = 0x00;
  78             PORTF = 0x00;
  79             break;
  80         case 1:
  81             DDRD  = (1<<1);
  82             PORTD = 0x00;
  83             DDRC  = 0x00;
  84             PORTC = 0x00;
  85             DDRF  = 0x00;
  86             PORTF = 0x00;
  87             break;
  88         case 2:
  89             DDRD  = (1<<2);
  90             PORTD = 0x00;
  91             DDRC  = 0x00;
  92             PORTC = 0x00;
  93             DDRF  = 0x00;
  94             PORTF = 0x00;
  95             break;
  96         case 3:
  97             DDRD  = (1<<3);
  98             PORTD = 0x00;
  99             DDRC  = 0x00;
 100             PORTC = 0x00;
 101             DDRF  = 0x00;
 102             PORTF = 0x00;
 103             break;
 104         case 4:
 105             DDRD  = (1<<6);
 106             PORTD = 0x00;
 107             DDRC  = 0x00;
 108             PORTC = 0x00;
 109             DDRF  = 0x00;
 110             PORTF = 0x00;
 111             break;
 112         case 5:
 113             DDRD  = (1<<7);
 114             PORTD = 0x00;
 115             DDRC  = 0x00;
 116             PORTC = 0x00;
 117             DDRF  = 0x00;
 118             PORTF = 0x00;
 119             break;
 120         case 6:
 121             DDRD  = 0x00;
 122             PORTD = 0x00;
 123             DDRC  = (1<<6);
 124             PORTC = 0x00;
 125             DDRF  = 0x00;
 126             PORTF = 0x00;
 127             break;
 128         case 7:
 129             DDRD  = 0x00;
 130             PORTD = 0x00;
 131             DDRC  = (1<<7);
 132             PORTC = 0x00;
 133             DDRF  = 0x00;
 134             PORTF = 0x00;
 135             break;
 136         case 8:
 137             DDRD  = 0x00;
 138             PORTD = 0x00;
 139             DDRC  = 0x00;
 140             PORTC = 0x00;
 141             DDRF  = (1<<7);
 142             PORTF = 0x00;
 143             break;
 144     }
 145 }
 146
 147 uint8_t read_col(void)
 148 {
 149     return PINB;
 150 }
 151
 152 int main(void)
 153 {
 154         uint8_t i, reset_idle;
 155         uint8_t prev_state[MAX_ROW];
 156         for (int i=0; i < MAX_ROW; i++) prev_state[i] = 0xFF;
 157
 158         // set for 16 MHz clock
 159         CPU_PRESCALE(0);
 160
 161         port_setup();
 162
 163
 164         // Initialize the USB, and then wait for the host to set configuration.
 165         // If the Teensy is powered without a PC connected to the USB port,
 166         // this will wait forever.
 167         usb_init();
 168         while (!usb_configured()) /* wait */ ;
 169
 170         // Wait an extra second for the PC's operating system to load drivers
 171         // and do whatever it does to actually be ready for input
 172         _delay_ms(1000);
 173
 174         // Configure timer 0 to generate a timer overflow interrupt every
 175         // 256*1024 clock cycles, or approx 61 Hz when using 16 MHz clock
 176         // This demonstrates how to use interrupts to implement a simple
 177         // inactivity timeout.
 178         TCCR0A = 0x00;
 179         TCCR0B = 0x05;
 180         TIMSK0 = (1<<TOIE0);
 181
 182         print("Begin keyboard example program\n");
 183         print("All Port B or Port D pins are inputs with pullup resistors.\n");
 184         print("Any connection to ground on Port B or D pins will result in\n");
 185         print("keystrokes sent to the PC (and debug messages here).\n");
 186
 187         uint8_t col;
 188         uint8_t code;
 189         while (1) {
 190             reset_idle = 0;
 191
 192             for (uint8_t r=0; r < MAX_ROW; r++) {
 193                 select_row(r);
 194
 195                 // without this read unstable value.
 196                 _delay_us(30);
 197
 198                 col = read_col();
 199                 if (col != prev_state[r]) {
 200                     prev_state[r] = col;
 201                     phex(r);
 202                     print(": ");
 203                     pbin(col);
 204                     print("\n");
 205
 206                     for (int c = 0; c < 8; c++) {
 207                         if (col & 1<<c) continue;
 208                         code = get_keycode(r, c);
 209                         phex(code);
 210                         print("\n");
 211                         usb_keyboard_press(code, 0);
 212                     }
 213
 214                     reset_idle = 1;
 215                 }
 216             }
 217
 218
 219
 220                 // if any keypresses were detected, reset the idle counter
 221                 if (reset_idle) {
 222                         // variables shared with interrupt routines must be
 223                         // accessed carefully so the interrupt routine doesn't
 224                         // try to use the variable in the middle of our access
 225                         cli();
 226                         idle_count = 0;
 227                         sei();
 228                 }
 229
 230                 // now the current pins will be the previous, and
 231                 // wait a short delay so we're not highly sensitive
 232                 // to mechanical "bounce".
 233                 _delay_ms(2);
 234         }
 235 }
 236
 237 // This interrupt routine is run approx 61 times per second.
 238 // A very simple inactivity timeout is implemented, where we
 239 // will send a space character and print a message to the
 240 // hid_listen debug message window.
 241 ISR(TIMER0_OVF_vect)
 242 {
 243         idle_count++;
 244         if (idle_count > 61 * 8) {
 245                 idle_count = 0;
 246                 print("Timer Event :)\n");
 247                 //usb_keyboard_press(KEY_SPACE, 0);
 248         }
 249 }
 250
 251