252 lines
6.6 KiB
C
252 lines
6.6 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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#include "keymap.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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//
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// scan matrix
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//
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uint8_t MAX_ROW = 9;
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// initialize ports for matrix
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void port_setup(void)
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{
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// Column: input w/pullup
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DDRB = 0x00;
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PORTB = 0xFF;
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// Row: Hi-Z(unselected)
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// PD:0,1,2,3,6,7
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// PC:6,7
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// PF:7
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DDRD = 0x00;
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PORTD = 0x00;
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DDRC = 0x00;
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PORTC = 0x00;
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DDRF = 0x00;
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PORTF = 0x00;
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}
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// select a row of matrix for read
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void select_row(uint8_t row)
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{
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switch (row) {
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case 0:
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DDRD = (1<<0);
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PORTD = 0x00;
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DDRC = 0x00;
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PORTC = 0x00;
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DDRF = 0x00;
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PORTF = 0x00;
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break;
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case 1:
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DDRD = (1<<1);
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PORTD = 0x00;
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DDRC = 0x00;
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PORTC = 0x00;
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DDRF = 0x00;
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PORTF = 0x00;
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break;
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case 2:
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DDRD = (1<<2);
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PORTD = 0x00;
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DDRC = 0x00;
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PORTC = 0x00;
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DDRF = 0x00;
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PORTF = 0x00;
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break;
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case 3:
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DDRD = (1<<3);
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PORTD = 0x00;
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DDRC = 0x00;
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PORTC = 0x00;
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DDRF = 0x00;
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PORTF = 0x00;
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break;
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case 4:
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DDRD = (1<<6);
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PORTD = 0x00;
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DDRC = 0x00;
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PORTC = 0x00;
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DDRF = 0x00;
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PORTF = 0x00;
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break;
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case 5:
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DDRD = (1<<7);
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PORTD = 0x00;
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DDRC = 0x00;
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PORTC = 0x00;
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DDRF = 0x00;
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PORTF = 0x00;
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break;
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case 6:
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DDRD = 0x00;
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PORTD = 0x00;
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DDRC = (1<<6);
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PORTC = 0x00;
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DDRF = 0x00;
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PORTF = 0x00;
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break;
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case 7:
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DDRD = 0x00;
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PORTD = 0x00;
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DDRC = (1<<7);
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PORTC = 0x00;
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DDRF = 0x00;
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PORTF = 0x00;
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break;
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case 8:
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DDRD = 0x00;
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PORTD = 0x00;
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DDRC = 0x00;
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PORTC = 0x00;
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DDRF = (1<<7);
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PORTF = 0x00;
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break;
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}
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}
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uint8_t read_col(void)
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{
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return PINB;
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}
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int main(void)
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{
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uint8_t i, reset_idle;
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uint8_t prev_state[MAX_ROW];
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for (int i=0; i < MAX_ROW; i++) prev_state[i] = 0xFF;
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// set for 16 MHz clock
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CPU_PRESCALE(0);
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port_setup();
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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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uint8_t col;
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uint8_t code;
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while (1) {
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reset_idle = 0;
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for (uint8_t r=0; r < MAX_ROW; r++) {
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select_row(r);
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// without this read unstable value.
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_delay_us(30);
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col = read_col();
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if (col != prev_state[r]) {
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prev_state[r] = col;
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phex(r);
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print(": ");
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pbin(col);
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print("\n");
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for (int c = 0; c < 8; c++) {
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if (col & 1<<c) continue;
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code = get_keycode(r, c);
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phex(code);
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print("\n");
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usb_keyboard_press(code, 0);
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}
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reset_idle = 1;
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}
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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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_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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