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USBHost: Wait for device to implement SET ADDRESS #10651

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May 31, 2019
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USBHost: Wait for device to implement SET ADDRESS #10651

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7 changes: 7 additions & 0 deletions features/unsupported/USBHost/USBHost/USBHost.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -163,6 +163,13 @@ void USBHost::usb_process()
devices[i].activeAddress(true);
USB_DBG("Address of %p: %d", &devices[i], devices[i].getAddress());

// Wait for the device to actually set the address. The Status stage
// of SET ADDRESS happens before the device implements the request.
// According to Universal Serial Bus Specification Revision 2.0 chapter
// 9.2.6.3 Set Address Processing, the device is allowed SetAddress()
// recovery interval of 2 ms.
ThisThread::sleep_for(2);

// try to read again the device descriptor to check if the device
// answers to its new address
res = getDeviceDescriptor(&devices[i], buf, 8);
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