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- /* Copyright (C) 2011 by Jacob Alexander
- *
- * 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.
- */
-
- // ----- Includes -----
-
- // AVR Includes
- #include <avr/io.h>
- #include <avr/pgmspace.h>
- #include <avr/interrupt.h>
-
- // Project Includes
- //#include "usb_keys.h"
- #include "scan_loop.h"
- //#include "layouts.h"
- //#include "usb_keyboard.h"
-
- #include "usb_keyboard_debug.h"
- #include "print.h"
- #include "led.h"
-
-
-
- // ----- Defines -----
-
- // Verified Keypress Defines
- #define USB_TRANSFER_DIVIDER 10 // 1024 == 1 Send of keypresses per second, 1 == 1 Send of keypresses per ~1 millisecond
-
-
-
- // ----- Macros -----
- #define CPU_PRESCALE(n) (CLKPR = 0x80, CLKPR = (n))
-
-
-
- // ----- Variables -----
-
- // Timer Interrupt for flagging a send of the sampled key detection data to the USB host
- uint16_t sendKeypressCounter = 0;
-
- // Flag generated by the timer interrupt
- volatile uint8_t sendKeypresses = 0;
-
-
-
- // ----- Functions -----
-
- // Initial Pin Setup, make sure they are sane
- inline void pinSetup(void)
- {
- // For each pin, 0=input, 1=output
- DDRA = 0x00;
- DDRB = 0x00;
- DDRC = 0x00;
- DDRD = 0x00;
- DDRE = 0x00;
- DDRF = 0x00;
-
-
- // Setting pins to either high or pull-up resistor
- PORTA = 0x00;
- PORTB = 0x00;
- PORTC = 0x00;
- PORTD = 0x00;
- PORTE = 0x00;
- PORTF = 0x00;
- }
-
- int main(void)
- {
- // Setup with 16 MHz clock
- CPU_PRESCALE( 0 );
-
- // Configuring Pins
- pinSetup();
-
- // Setup USB Module
- usb_setup();
-
- // Setup ISR Timer for flagging a kepress send to USB
- // Set to 256 * 1024 (8 bit timer with Clock/1024 prescalar) timer
- TCCR0A = 0x00;
- TCCR0B = 0x03;
- TIMSK0 = (1 << TOIE0);
-
- // Main Detection Loop
- while ( 1 ) {
- //scan_loop();
-
- // Loop should never get here (indicate error)
- errorLED( 1 );
-
- // HID Debug Error message
- erro_print("Detection loop error, this is very bad...bug report!");
-
- // Send keypresses over USB if the ISR has signalled that it's time
- if ( !sendKeypresses )
- continue;
-
- // Send USB Data
- usb_send();
-
- // Clear sendKeypresses Flag
- sendKeypresses = 0;
- }
- }
-
- ISR( TIMER0_OVF_vect )
- {
- sendKeypressCounter++;
- if ( sendKeypressCounter > USB_TRANSFER_DIVIDER ) {
- sendKeypressCounter = 0;
- sendKeypresses = 1;
- }
- }
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