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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))
-
- #undef STR_MANUFACTURER
- #undef STR_PRODUCT
-
- #define STR_MANUFACTURER L"Clayton G. Hobbs"
- #define STR_PRODUCT L"Music Score Foot Pedal"
-
- uint16_t idle_count = 0;
- uint8_t pressed = 0;
- uint8_t last = 0;
-
- int main(void)
- {
- uint8_t d, mask;
- uint8_t d_prev=0xFF;
-
- // set for 16 MHz clock
- CPU_PRESCALE(0);
-
- // Configure all port B pins as inputs with pullup resistors.
- // See the "Using I/O Pins" page for details.
- // http://www.pjrc.com/teensy/pins.html
- DDRD = 0x00;
- 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 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
- d = PIND;
- // check if any pins are low, but were high previously
- mask = 1 << 5;
- if (((d & mask) == 0) && (d_prev & mask) != 0) {
- cli();
- pressed += 1;
- 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".
- d_prev = d;
- _delay_ms(2);
- }
- }
-
- // This interrupt routine is run approx 61 times per second.
- // All keypresses are sent here. When a single press occurred with nothing
- // else for a whole second, send a page down. Further presses less than a
- // second apart following that timeout send more page downs. If after a period
- // of inactivity, two presses occur within one second, send a page up. Further
- // presses less than a second apart send more page ups.
- ISR(TIMER0_OVF_vect)
- {
- idle_count++;
- if (idle_count > 30 && pressed > 0 && last != KEY_PAGE_UP) {
- usb_keyboard_press(KEY_PAGE_DOWN, 0);
- pressed -= 1;
- idle_count = 0;
- last = KEY_PAGE_DOWN;
- } else if (idle_count <= 30 && pressed == 2 && last != KEY_PAGE_DOWN) {
- usb_keyboard_press(KEY_PAGE_UP, 0);
- pressed -= 1;
- idle_count = 0;
- last = KEY_PAGE_UP;
- } else if (idle_count <= 30 && pressed > 0 && last == KEY_PAGE_DOWN) {
- usb_keyboard_press(KEY_PAGE_DOWN, 0);
- pressed -= 1;
- idle_count = 0;
- last = KEY_PAGE_DOWN;
- } else if (idle_count > 30 && pressed == 0) {
- last = 0;
- pressed = 0;
- idle_count = 0;
- } else if (idle_count > 30 && pressed > 0 && last == KEY_PAGE_UP) {
- last = 0;
- pressed = 0;
- idle_count = 0;
- }
- }
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