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controller/main.c

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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
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#include <avr/io.h>
#include <avr/interrupt.h>
// Project Includes
#include <macro.h>
#include <scan_loop.h>
#include <usb_com.h>
#include <led.h>
#include <print.h>
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// ----- 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;
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// ----- Functions -----
// Initial Pin Setup, make sure they are sane
inline void pinSetup(void)
{
// For each pin, 0=input, 1=output
#if defined(__AVR_AT90USB1286__)
DDRA = 0x00;
#endif
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DDRB = 0x00;
DDRC = 0x00;
DDRD = 0x00;
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DDRE = 0x00;
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DDRF = 0x00;
// Setting pins to either high or pull-up resistor
#if defined(__AVR_AT90USB1286__)
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PORTA = 0x00;
#endif
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PORTB = 0x00;
PORTC = 0x00;
PORTD = 0x00;
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PORTE = 0x00;
PORTF = 0x00;
}
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int main(void)
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{
// Setup with 16 MHz clock
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CPU_PRESCALE( 0 );
// Configuring Pins
pinSetup();
init_errorLED();
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// Setup USB Module
usb_setup();
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// 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);
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// Main Detection Loop
uint8_t ledTimer = 15; // Enable LED for a short time
while ( 1 )
{
// Setup the scanning module
scan_setup();
while ( 1 )
{
// Acquire Key Indices
// Loop continuously until scan_loop returns 0
cli();
while ( scan_loop() );
sei();
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// Run Macros over Key Indices and convert to USB Keys
process_macros();
// Send keypresses over USB if the ISR has signalled that it's time
if ( !sendKeypresses )
continue;
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// Send USB Data
usb_send();
// Clear sendKeypresses Flag
sendKeypresses = 0;
// Indicate Error, if valid
errorLED( ledTimer );
if ( ledTimer > 0 )
ledTimer--;
}
// Loop should never get here (indicate error)
ledTimer = 255;
// HID Debug Error message
erro_print("Detection loop error, this is very bad...bug report!");
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}
}
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// USB Keyboard Data Send Counter Interrupt
ISR( TIMER0_OVF_vect )
{
sendKeypressCounter++;
if ( sendKeypressCounter > USB_TRANSFER_DIVIDER ) {
sendKeypressCounter = 0;
sendKeypresses = 1;
}
}