void fcBuffers::finalizeFrame()
{
// Called in main loop context.
// Finalize any frames received during the course of this loop iteration,
// and update the status LED.
if (flags & CFLAG_NO_ACTIVITY_LED) {
// LED under manual control
digitalWriteFast(LED_BUILTIN, flags & CFLAG_LED_CONTROL);
} else {
// Use the built-in LED as a USB activity indicator.
digitalWriteFast(LED_BUILTIN, handledAnyPacketsThisFrame);
}
handledAnyPacketsThisFrame = false;
if (pendingFinalizeFrame) {
finalizeFramebuffer();
pendingFinalizeFrame = false;
}
if (pendingFinalizeLUT) {
finalizeLUT();
pendingFinalizeLUT = false;
}
// Let the USB driver know we may be able to process buffers that were previously deferred
usb_rx_resume();
}
void fcBuffers::handleUSB()
{
/*
* Look for incoming USB packets, and file them appropriately.
* Our framebuffer and LUT buffers are arrays of references to USB packets
* which we hold until a new packet arrives to replace them.
*/
bool handledAnyPackets = false;
while (1) {
usb_packet_t *packet = usb_rx(FC_OUT_ENDPOINT);
if (!packet) {
break;
}
handledAnyPackets = true;
unsigned control = packet->buf[0];
unsigned type = control & TYPE_BITS;
unsigned final = control & FINAL_BIT;
unsigned index = control & INDEX_BITS;
switch (type) {
case TYPE_FRAMEBUFFER:
fbNew->store(index, packet);
if (final) {
finalizeFramebuffer();
}
break;
case TYPE_LUT:
lutNew.store(index, packet);
if (final) {
finalizeLUT();
}
break;
case TYPE_CONFIG:
flags = packet->buf[1];
usb_free(packet);
break;
default:
usb_free(packet);
break;
}
}
if (flags & CFLAG_NO_ACTIVITY_LED) {
// LED under manual control
digitalWrite(LED_BUILTIN, flags & CFLAG_LED_CONTROL);
} else {
// Use the built-in LED as a USB activity indicator.
digitalWrite(LED_BUILTIN, handledAnyPackets);
}
}