129 lines
3.3 KiB
C
129 lines
3.3 KiB
C
/* Copyright (C) 2011 by Jacob Alexander
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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_keys.h"
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#include "scan_loop.h"
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//#include "layouts.h"
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//#include "usb_keyboard.h"
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// TEMP INCLUDES
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#include "usb_keyboard_debug.h"
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#include "print.h"
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#define CPU_PRESCALE(n) (CLKPR = 0x80, CLKPR = (n))
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// Verified Keypress Defines
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#define USB_TRANSFER_DIVIDER 10 // 1024 == 1 Send of keypresses per second, 1 == 1 Send of keypresses per ~1 millisecond
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// Error LED Control
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void errorLED( uint8_t on )
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{
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// Error LED On
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if ( on ) {
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PORTD |= (1<<6);
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}
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// Error LED Off
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else {
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PORTD &= ~(1<<6);
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}
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}
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// Initial Pin Setup
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// If the matrix is properly set, this function does not need to be changed
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inline void pinSetup(void)
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{
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// For each pin, 0=input, 1=output
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DDRA = 0x00;
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DDRB = 0x00;
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DDRC = 0x00;
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DDRD = 0x40; // LED Setup
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DDRE = 0x00;
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DDRF = 0x00;
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// Setting pins to either high or pull-up resistor
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PORTA = 0x00;
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PORTB = 0x00;
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PORTC = 0x00;
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PORTD = 0x40; // LED Enable
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PORTE = 0x00;
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PORTF = 0x00;
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}
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int main( void )
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{
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// Setup with 16 MHz clock
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CPU_PRESCALE( 0 );
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// Configuring Pins
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pinSetup();
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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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// Setup ISR Timer for flagging a kepress send to USB
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// Set to 256 * 1024 (8 bit timer with Clock/1024 prescalar) timer
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TCCR0A = 0x00;
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TCCR0B = 0x03;
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TIMSK0 = (1 << TOIE0);
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uint16_t led = 0;
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// Main Detection Loop
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while ( 1 ) {
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//scan_loop();
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// Loop should never get here (indicate error)
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errorLED( 1 );
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// HID Debug Error message
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erro_print("Detection loop error, this is very bad...bug report!");
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}
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}
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// Timer Interrupt for flagging a send of the sampled key detection data to the USB host
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uint16_t sendKeypressCounter = 0;
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ISR( TIMER0_OVF_vect )
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{
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sendKeypressCounter++;
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if ( sendKeypressCounter > USB_TRANSFER_DIVIDER ) {
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sendKeypressCounter = 0;
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sendKeypresses = 1;
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}
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}
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