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Handle stall (EPIPE) which is raised as an exception by pyusb. #9

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Handle stall (EPIPE) which is raised as an exception by pyusb. #9

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18 changes: 16 additions & 2 deletions dfuse/DfuDevice.py
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Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
import usb.util
import time
import errno

DFU_REQUEST_SEND = 0x21
DFU_REQUEST_RECEIVE = 0xa1
Expand Down Expand Up @@ -48,8 +49,21 @@ def upload(self, blockNum, size):
return self.control_msg(DFU_REQUEST_RECEIVE, DFU_UPLOAD, blockNum, size)

def get_status(self):
status = self.control_msg(DFU_REQUEST_RECEIVE, DFU_GETSTATUS, 0, 6)
return (status[0], status[4], status[1] + (status[2] << 8) + (status[3] << 16), status[5])
# An arbitrary number of retries.
for i in range(5):
try:
status = self.control_msg(DFU_REQUEST_RECEIVE, DFU_GETSTATUS, 0, 6)
return (status[0], status[4], status[1] + (status[2] << 8) + (status[3] << 16), status[5])
except usb.core.USBError as ex:
if ex.errno == errno.EPIPE:
# Stalled; wait for it to clear.
time.sleep(.01 * i)
else:
raise
else:
# One last time to either succeed or raise the exception
status = self.control_msg(DFU_REQUEST_RECEIVE, DFU_GETSTATUS, 0, 6)
return (status[0], status[4], status[1] + (status[2] << 8) + (status[3] << 16), status[5])

def clear_status(self):
self.control_msg(DFU_REQUEST_SEND, DFU_CLRSTATUS, 0, None)
Expand Down