From ba984fff20f890df1bf39b849c4d9276ff62f601 Mon Sep 17 00:00:00 2001
From: Jacob Alexander <haata@kiibohd.com>
Date: Fri, 19 Sep 2014 19:33:20 -0700
Subject: [PATCH] Removing USB timer, no longer necessary.

---
 main.c | 93 +---------------------------------------------------------
 1 file changed, 1 insertion(+), 92 deletions(-)

diff --git a/main.c b/main.c
index 3a6096f..d174c47 100644
--- a/main.c
+++ b/main.c
@@ -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
-}
-