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- /* Keyboard example with debug channel, for Teensy USB Development Board
- * http://www.pjrc.com/teensy/usb_keyboard.html
- * Copyright (c) 2008 PJRC.COM, LLC
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
-
- #include <avr/io.h>
- #include <avr/pgmspace.h>
- #include <avr/interrupt.h>
- #include <util/delay.h>
- #include "usb_keyboard_debug.h"
- #include "print.h"
-
- #define LED_CONFIG (DDRD |= (1<<6))
- #define LED_ON (PORTD &= ~(1<<6))
- #define LED_OFF (PORTD |= (1<<6))
- #define CPU_PRESCALE(n) (CLKPR = 0x80, CLKPR = (n))
-
- uint8_t number_keys[10]=
- {KEY_0,KEY_1,KEY_2,KEY_3,KEY_4,KEY_5,KEY_6,KEY_7,KEY_8,KEY_9};
-
- uint16_t idle_count=0;
-
- int main(void)
- {
- uint8_t b, d, mask, i, reset_idle;
- uint8_t b_prev=0xFF, d_prev=0xFF;
-
- // set for 16 MHz clock
- CPU_PRESCALE(0);
-
- // Configure all port B and port D pins as inputs with pullup resistors.
- // See the "Using I/O Pins" page for details.
- // http://www.pjrc.com/teensy/pins.html
- DDRD = 0x00;
- DDRB = 0x00;
- PORTB = 0xFF;
- PORTD = 0xFF;
-
- // Initialize the USB, and then wait for the host to set configuration.
- // If the Teensy is powered without a PC connected to the USB port,
- // this will wait forever.
- usb_init();
- while (!usb_configured()) /* wait */ ;
-
- // Wait an extra second for the PC's operating system to load drivers
- // and do whatever it does to actually be ready for input
- _delay_ms(1000);
-
- // Configure timer 0 to generate a timer overflow interrupt every
- // 256*1024 clock cycles, or approx 61 Hz when using 16 MHz clock
- // This demonstrates how to use interrupts to implement a simple
- // inactivity timeout.
- TCCR0A = 0x00;
- TCCR0B = 0x05;
- TIMSK0 = (1<<TOIE0);
-
- print("Begin keyboard example program\n");
- print("All Port B or Port D pins are inputs with pullup resistors.\n");
- print("Any connection to ground on Port B or D pins will result in\n");
- print("keystrokes sent to the PC (and debug messages here).\n");
- while (1) {
- // read all port B and port D pins
- b = PINB;
- d = PIND;
- // check if any pins are low, but were high previously
- mask = 1;
- reset_idle = 0;
- for (i=0; i<8; i++) {
- if (((b & mask) == 0) && (b_prev & mask) != 0) {
- //usb_keyboard_press(KEY_B, KEY_SHIFT);
- //usb_keyboard_press(number_keys[i], 0);
- print("Port B, bit ");
- phex(i);
- print("\n");
- reset_idle = 1;
- }
- if (((d & mask) == 0) && (d_prev & mask) != 0) {
- //usb_keyboard_press(KEY_D, KEY_SHIFT);
- //usb_keyboard_press(number_keys[i], 0);
- print("Port D, bit ");
- phex(i);
- print("\n");
- reset_idle = 1;
- }
- mask = mask << 1;
- }
- // if any keypresses were detected, reset the idle counter
- if (reset_idle) {
- // variables shared with interrupt routines must be
- // accessed carefully so the interrupt routine doesn't
- // try to use the variable in the middle of our access
- cli();
- idle_count = 0;
- sei();
- }
- // now the current pins will be the previous, and
- // wait a short delay so we're not highly sensitive
- // to mechanical "bounce".
- b_prev = b;
- d_prev = d;
- _delay_ms(2);
- }
- }
-
- // This interrupt routine is run approx 61 times per second.
- // A very simple inactivity timeout is implemented, where we
- // will send a space character and print a message to the
- // hid_listen debug message window.
- ISR(TIMER0_OVF_vect)
- {
- idle_count++;
- if (idle_count > 61 * 8) {
- idle_count = 0;
- print("Timer Event :)\n");
- //usb_keyboard_press(KEY_SPACE, 0);
- }
- }
-
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