From b71ff7c8cd68209a74c8690f4d190cc634ef8fb3 Mon Sep 17 00:00:00 2001
From: Dean Camera <dean@fourwalledcubicle.com>
Date: Sun, 16 Aug 2009 08:51:54 +0000
Subject: Added new EVENT_USB_Device_StartOfFrame() event, controlled by the
 new USB_Device_EnableSOFEvents() and USB_Device_DisableSOFEvents() macros to
 give bus-synchronised millisecond interrupts when in USB device mode.

---
 Projects/Magstripe/Magstripe.c | 12 ++++--------
 Projects/Magstripe/Magstripe.h |  1 +
 2 files changed, 5 insertions(+), 8 deletions(-)

(limited to 'Projects/Magstripe')

diff --git a/Projects/Magstripe/Magstripe.c b/Projects/Magstripe/Magstripe.c
index 5be34492a..3ea505296 100644
--- a/Projects/Magstripe/Magstripe.c
+++ b/Projects/Magstripe/Magstripe.c
@@ -99,12 +99,6 @@ void SetupHardware(void)
 	/* Hardware Initialization */
 	Magstripe_Init();
 	USB_Init();
-
-	/* Millisecond timer initialization, with output compare interrupt enabled for the idle timing */
-	OCR0A  = ((F_CPU / 64) / 1000);
-	TCCR0A = (1 << WGM01);
-	TCCR0B = ((1 << CS01) | (1 << CS00));
-	TIMSK0 = (1 << OCIE0A);
 }
 
 /** Determines if a card has been inserted, and if so reads in each track's contents into the bit buffers
@@ -148,6 +142,8 @@ void ReadMagstripeData(void)
 void EVENT_USB_Device_ConfigurationChanged(void)
 {
 	HID_Device_ConfigureEndpoints(&Keyboard_HID_Interface);
+	
+	USB_Device_EnableSOFEvents();
 }
 
 /** Event handler for the library USB Unhandled Control Packet event. */
@@ -156,8 +152,8 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 	HID_Device_ProcessControlRequest(&Keyboard_HID_Interface);
 }
 
-/** Timer 0 CTC ISR, firing once each millisecond to keep track of elapsed idle time in the HID interface. */
-ISR(TIMER0_COMPA_vect, ISR_BLOCK)
+/** Event handler for the USB device Start Of Frame event. */
+void EVENT_USB_Device_StartOfFrame(void)
 {
 	HID_Device_MillisecondElapsed(&Keyboard_HID_Interface);
 }
diff --git a/Projects/Magstripe/Magstripe.h b/Projects/Magstripe/Magstripe.h
index 7cbda8302..aabf6ac91 100644
--- a/Projects/Magstripe/Magstripe.h
+++ b/Projects/Magstripe/Magstripe.h
@@ -84,6 +84,7 @@
 		
 		void EVENT_USB_Device_ConfigurationChanged(void);
 		void EVENT_USB_Device_UnhandledControlRequest(void);
+		void EVENT_USB_Device_StartOfFrame(void);
 
 		bool CALLBACK_HID_Device_CreateHIDReport(USB_ClassInfo_HID_Device_t* const HIDInterfaceInfo, uint8_t* const ReportID,
                                                  void* ReportData, uint16_t* ReportSize);
-- 
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