-// ----- 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 -----
-#if defined(_at90usb162_) || defined(_atmega32u4_) || defined(_at90usb646_) || defined(_at90usb1286_)
-#define CPU_PRESCALE(n) (CLKPR = 0x80, CLKPR = (n))
-#endif
-
-
-
-// ----- Function Declarations -----
-
-
-
-// ----- 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)
-{
-
-// AVR
-#if defined(_at90usb162_) || defined(_atmega32u4_) || defined(_at90usb646_) || defined(_at90usb1286_)
-
- // For each pin, 0=input, 1=output
-#if defined(__AVR_AT90USB1286__)
- DDRA = 0x00;
-#endif
- DDRB = 0x00;
- DDRC = 0x00;
- DDRD = 0x00;
- DDRE = 0x00;
- DDRF = 0x00;
-
-
- // Setting pins to either high or pull-up resistor
-#if defined(__AVR_AT90USB1286__)
- PORTA = 0x00;
-#endif
- PORTB = 0x00;
- PORTC = 0x00;
- PORTD = 0x00;
- PORTE = 0x00;
- PORTF = 0x00;
-
-// ARM
-#elif defined(_mk20dx128_)
- // TODO - Should be cleared, but not that necessary due to the pin layout
-#endif
-}
-
-
-inline void usbTimerSetup(void)
+int main()
{
-// AVR
+ // AVR - Teensy Set Clock speed to 16 MHz
#if defined(_at90usb162_) || defined(_atmega32u4_) || defined(_at90usb646_) || defined(_at90usb1286_)
-
- // Setup with 16 MHz clock
- CPU_PRESCALE( 0 );
-
- // 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);
-
-// ARM
-#elif defined(_mk20dx128_)
- // 48 MHz clock by default
-
- // System Clock Gating Register Disable
- SIM_SCGC6 |= SIM_SCGC6_PIT;
-
- // Enable Timers
- PIT_MCR = 0x00;
-
- // Setup ISR Timer for flagging a kepress send to USB
- // 1 ms / (1 / 48 MHz) - 1 = 47999 cycles -> 0xBB7F
- PIT_LDVAL0 = 0x0000BB7F;
- PIT_TCTRL0 = 0x3; // Enable Timer 0 interrupts, and Enable Timer 0
-
- // Insert the required vector for Timer 0
- NVIC_ENABLE_IRQ( IRQ_PIT_CH0 );
+ CLKPR = 0x80;
+ CLKPR = 0x00;
#endif
-}
-
-
-int main(void)
-{
- // Configuring Pins
- pinSetup();
// Enable CLI
CLI_init();
Macro_setup();
Scan_setup();
- // Setup ISR Timer for flagging a kepress send to USB
- usbTimerSetup();
-
// Main Detection Loop
while ( 1 )
{
// Acquire Key Indices
// Loop continuously until scan_loop returns 0
cli();
- //while ( scan_loop() );
+ while ( Scan_loop() );
sei();
// Run Macros over Key Indices and convert to USB Keys
Macro_process();
- // Send keypresses over USB if the ISR has signalled that it's time
- if ( !sendKeypresses )
- continue;
-
- // Send USB Data
+ // Sends USB data only if changed
Output_send();
-
- // Clear sendKeypresses Flag
- sendKeypresses = 0;
- }
-}
-
-
-// ----- Interrupts -----
-
-// USB Keyboard Data Send Counter Interrupt
-#if defined(_at90usb162_) || defined(_atmega32u4_) || defined(_at90usb646_) || defined(_at90usb1286_) // AVR
-ISR( TIMER0_OVF_vect )
-#elif defined(_mk20dx128_) || defined(_mk20dx256_) // ARM
-void pit0_isr(void)
-#endif
-{
- sendKeypressCounter++;
- if ( sendKeypressCounter > USB_TRANSFER_DIVIDER ) {
- sendKeypressCounter = 0;
- sendKeypresses = 1;
}
-
-#if defined(_mk20dx128_) // ARM
- // Clear the interrupt flag
- PIT_TFLG0 = 1;
-#endif
}
-
-// ----- CLI Command Functions -----
-
-