/** ISR for the general Pipe/Endpoint interrupt vector. This ISR fires when a control request has been issued to the control endpoint,
* so that the request can be processed. As several elements of the Mass Storage implementation require asynchronous control requests
* (such as endpoint stall clearing and Mass Storage Reset requests during data transfers) this is done via interrupts rather than
* polling.
*/
ISR(ENDPOINT_PIPE_vect, ISR_BLOCK)
{
/* Check if the control endpoint has received a request */
if (Endpoint_HasEndpointInterrupted(ENDPOINT_CONTROLEP))
{
/* Clear the endpoint interrupt */
Endpoint_ClearEndpointInterrupt(ENDPOINT_CONTROLEP);
/* Process the control request */
USB_USBTask();
/* Handshake the endpoint setup interrupt - must be after the call to USB_USBTask() */
USB_INT_Clear(ENDPOINT_INT_SETUP);
}
}
/** ISR for the general Pipe/Endpoint interrupt vector. This ISR fires when an endpoint's status changes (such as
* a packet has been received) on an endpoint with its corresponding ISR enabling bits set. This is used to send
* HID packets to the host each time the HID interrupt endpoints polling period elapses, as managed by the USB
* controller.
*/
ISR(ENDPOINT_PIPE_vect, ISR_BLOCK)
{
/* Save previously selected endpoint before selecting a new endpoint */
uint8_t PrevSelectedEndpoint = Endpoint_GetCurrentEndpoint();
#if defined(INTERRUPT_CONTROL_ENDPOINT)
/* Check if the control endpoint has received a request */
if (Endpoint_HasEndpointInterrupted(ENDPOINT_CONTROLEP))
{
/* Clear the endpoint interrupt */
Endpoint_ClearEndpointInterrupt(ENDPOINT_CONTROLEP);
/* Process the control request */
USB_USBTask();
/* Handshake the endpoint setup interrupt - must be after the call to USB_USBTask() */
USB_INT_Clear(ENDPOINT_INT_SETUP);
}
#endif
#if defined(INTERRUPT_DATA_ENDPOINT)
/* Check if Generic IN endpoint has interrupted */
if (Endpoint_HasEndpointInterrupted(GENERIC_IN_EPNUM))
{
/* Select the Generic IN Report Endpoint */
Endpoint_SelectEndpoint(GENERIC_IN_EPNUM);
/* Clear the endpoint IN interrupt flag */
USB_INT_Clear(ENDPOINT_INT_IN);
/* Clear the Generic IN Report endpoint interrupt and select the endpoint */
Endpoint_ClearEndpointInterrupt(GENERIC_IN_EPNUM);
/* Create a temporary buffer to hold the report to send to the host */
uint8_t GenericData[GENERIC_REPORT_SIZE];
/* Create Generic Report Data */
CreateGenericHIDReport(GenericData);
/* Write Generic Report Data */
Endpoint_Write_Stream_LE(&GenericData, sizeof(GenericData));
/* Finalize the stream transfer to send the last packet */
Endpoint_ClearIN();
}
/* Check if Generic OUT endpoint has interrupted */
if (Endpoint_HasEndpointInterrupted(GENERIC_OUT_EPNUM))
{
/* Select the Generic OUT Report Endpoint */
Endpoint_SelectEndpoint(GENERIC_OUT_EPNUM);
/* Clear the endpoint OUT Interrupt flag */
USB_INT_Clear(ENDPOINT_INT_OUT);
/* Clear the Generic OUT Report endpoint interrupt and select the endpoint */
Endpoint_ClearEndpointInterrupt(GENERIC_OUT_EPNUM);
/* Create a temporary buffer to hold the read in report from the host */
uint8_t GenericData[GENERIC_REPORT_SIZE];
/* Read Generic Report Data */
Endpoint_Read_Stream_LE(&GenericData, sizeof(GenericData));
/* Process Generic Report Data */
ProcessGenericHIDReport(GenericData);
/* Finalize the stream transfer to send the last packet */
Endpoint_ClearOUT();
}
#endif
/* Restore previously selected endpoint */
Endpoint_SelectEndpoint(PrevSelectedEndpoint);
}