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.

2 files changed, 5 insertions, 8 deletions

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);