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.

1 files changed, 5 insertions, 9 deletions

diff --git a/Demos/Device/ClassDriver/GenericHID/GenericHID.c b/Demos/Device/ClassDriver/GenericHID/GenericHID.c
index 13db6bf74..c27558b9e 100644
--- a/Demos/Device/ClassDriver/GenericHID/GenericHID.c
+++ b/Demos/Device/ClassDriver/GenericHID/GenericHID.c
@@ -94,18 +94,12 @@ void SetupHardware(void)
 	/* Hardware Initialization */

 	LEDs_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);

 }

 

 /** Event handler for the library USB Connection event. */

 void EVENT_USB_Device_Connect(void)

 {

-	LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);

+	LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);	

 }

 

 /** Event handler for the library USB Disconnection event. */

@@ -121,6 +115,8 @@ void EVENT_USB_Device_ConfigurationChanged(void)
 

 	if (!(HID_Device_ConfigureEndpoints(&Generic_HID_Interface)))

 	  LEDs_SetAllLEDs(LEDMASK_USB_ERROR);

+

+	USB_Device_EnableSOFEvents();

 }

 

 /** Event handler for the library USB Unhandled Control Request event. */

@@ -129,8 +125,8 @@ void EVENT_USB_Device_UnhandledControlRequest(void)
 	HID_Device_ProcessControlRequest(&Generic_HID_Interface);

 }

 

-/** ISR to keep track of each millisecond interrupt, for determining the HID class idle period remaining when set. */

-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(&Generic_HID_Interface);

 }