forked from M-Labs/artiq
coredevice/comm_serial: give up on garbage received after baudrate change
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cad5933709
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@ -88,16 +88,20 @@ class Comm:
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_write_exactly(self.port, struct.pack(
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">lbl", 0x5a5a5a5a, _H2DMsgType.SET_BAUD_RATE.value, baud))
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handshake = 0
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fails = 0
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while handshake < 4:
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recv = struct.unpack(
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"B", _read_exactly(self.port, 1))
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if recv[0] == 0x5a:
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(recv, ) = struct.unpack("B", _read_exactly(self.port, 1))
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if recv == 0x5a:
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handshake += 1
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else:
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# FIXME: when loading immediately after a board reset,
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# we erroneously get some zeros back.
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logger.warning("unexpected sync character: {:02x}".format(int(recv[0])))
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logger.warning("unexpected sync character: {:02x}".format(int(recv)))
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handshake = 0
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if recv != 0:
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fails += 1
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if fails > 3:
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raise IOError("Baudrate ack failed")
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self.set_baud(baud)
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logger.debug("synchronized")
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