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/* Keyboard example 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.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);
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);
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);
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.
ISR(TIMER0_OVF_vect)
{
idle_count++;
if (idle_count > 61 * 8) {
idle_count = 0;
usb_keyboard_press(KEY_SPACE, 0);
}
}
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