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