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Gracefully handle SETUP packets whose wLength > 255. #1

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Jan 6, 2021
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Gracefully handle SETUP packets whose wLength > 255. #1

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5 changes: 5 additions & 0 deletions valentyusb/usbcore/cpu/cdc_eptri.py
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Original file line number Diff line number Diff line change
Expand Up @@ -552,6 +552,11 @@ def add(self, wRequestAndType, wValue, mem):
# 4: wIndex.eq(data_recv_payload_delayed),
# 5: wIndex.eq(Cat(wIndex[0:8], data_recv_payload_delayed)),
6: NextValue(wLength,usb.setup_data.fields.data),
# Windows can and will send SETUP packets to this device with
# wLength > 255. Pretend the request length is 255 in this case
# since we don't ever send packets > 255 back. This avoids
# interpreting wLength as modulo 256.
7: If(usb.setup_data.fields.data > 0, NextValue(wLength, 255))
# 7: wLength.eq(Cat(wLength[0:8], data_recv_payload_delayed)),
}),
usb.setup_data.we.eq(1)
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