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Add USB send timeout #152

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Add USB send timeout #152

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11 changes: 10 additions & 1 deletion cores/arduino/USB/USBCore.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -602,6 +602,9 @@ uint8_t USBDeviceClass::armRecv(uint32_t ep)
return usbd.epBank0ByteCount(ep);
}

// Timeout for sends
#define TX_TIMEOUT_MS 70

// Blocking Send of data to an endpoint
uint32_t USBDeviceClass::send(uint32_t ep, const void *data, uint32_t len)
{
Expand Down Expand Up @@ -672,9 +675,15 @@ uint32_t USBDeviceClass::send(uint32_t ep, const void *data, uint32_t len)
// RAM buffer is full, we can send data (IN)
usbd.epBank1SetReady(ep);

// convert the timeout from microseconds to a number of times through
// the wait loop; it takes (roughly) 16 clock cycles per iteration.
uint32_t timeout = microsecondsToClockCycles(TX_TIMEOUT_MS * 1000) / 16;

// Wait for transfer to complete
while (!usbd.epBank1IsTransferComplete(ep)) {
; // need fire exit.
if (timeout-- == 0) {
return -1;
}
}
written += length;
len -= length;
Expand Down