Jacob Alexander
9 years ago
1 changed files with 1 additions and 92 deletions
+ 1
- 92
main.c
View File
| @@ -35,67 +35,8 @@ | |||
| // ----- 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 | |||
| // ----- 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 ----- | |||
| inline void usbTimerSetup() | |||
| { | |||
| // AVR | |||
| #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_) || defined(_mk20dx128vlf5_) || defined(_mk20dx256_) | |||
| // 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 ); | |||
| #endif | |||
| } | |||
| int main() | |||
| { | |||
| // Enable CLI | |||
| @@ -106,9 +47,6 @@ int main() | |||
| Macro_setup(); | |||
| Scan_setup(); | |||
| // Setup ISR Timer for flagging a kepress send to USB | |||
| usbTimerSetup(); | |||
| // Main Detection Loop | |||
| while ( 1 ) | |||
| { | |||
| @@ -124,37 +62,8 @@ int main() | |||
| // 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(_mk20dx128vlf5_) || defined(_mk20dx256_) // ARM | |||
| void pit0_isr() | |||
| #endif | |||
| { | |||
| sendKeypressCounter++; | |||
| if ( sendKeypressCounter > USB_TRANSFER_DIVIDER ) { | |||
| sendKeypressCounter = 0; | |||
| sendKeypresses = 1; | |||
| } | |||
| #if defined(_mk20dx128_) || defined(_mk20dx128vlf5_) || defined(_mk20dx256_) // ARM | |||
| // Clear the interrupt flag | |||
| PIT_TFLG0 = 1; | |||
| #endif | |||
| } | |||