def readDeviceDataIO(self):
results = self.readData()
lb, hb = results[5] & 0x7F, results[6]
self.eod = (results[5] & 0x80) > 0
resLength = lib.BangInt((lb, hb))
log.info('XXX resLength: %s' % resLength)
#assert resLength < 64, ("cmd low byte count:\n%s" % lib.hexdump(results))
data = results[13:13+resLength]
assert len(data) == resLength
crc = results[-1]
# crc check
log.info('readDeviceDataIO:msgCRC:%r:expectedCRC:%r:data:%s' % (crc, CRC8(data), lib.hexdump(data)))
assert crc == CRC8(data)
return data
def checkAck(self):
log.info('checkAck sleeping .100')
time.sleep(.100)
result = bytearray(self.read(64))
io.info('checkAck:read')
if len(result) == 0:
log.error("ACK is zero bytes!")
return False
raise BadDeviceCommError("ACK is not 64 bytes: %s" % lib.hexdump(result))
commStatus = result[0]
# usable response
assert commStatus == 1, ('commStatus: %02x expected 0x1' % commStatus)
status = result[1]
# status == 102 'f' NAK, look up NAK
if status == 85: # 'U'
log.info('checkACK OK, found %s total bytes' % len(result))
return result[3:]
assert False, "NAK!!"
def clearBuffers(self):
garbage = -1
while garbage:
garbage = bytearray(self.link.read(64))
log.error("found garbage:\n%s" % lib.hexdump(garbage))
