[chirp_devel] Random double ACK during upload

[Jim Unroe]

I am working with a radio that I am having a problem with the upload
procedure. Normally, after a "frame" is sent, the radio replies with
an ACK and the programming software sends the next "frame", another
ACK is received and so on.

The problem is that randomly the radio with reply with 2 ACKs instead
of 1. Currently my upload progresses fine until the double ACK is
encountered.

My upload code is below. Does anyone have any suggestions for how I
can bypass these occasional extra ACKs?

Thanks in advance,
Jim

def _upload(radio):
    """Upload procedure"""

    MEM_SIZE = 0x7000

    # put radio in program mode and identify it
    _do_ident(radio)

    # UI progress
    status = chirp_common.Status()
    status.cur = 0
    status.max = MEM_SIZE / BLOCK_SIZE
    status.msg = "Cloning to radio..."
    radio.status_fn(status)

    # the fun start here
    for addr in range(0, MEM_SIZE, BLOCK_SIZE):
        # sending the data
        data = radio.get_mmap()[addr:addr + BLOCK_SIZE]

        frame = _make_frame("W", addr, BLOCK_SIZE, data)

        _send(radio, frame)

        # receiving the response
        ack = _rawrecv(radio, 1)
        if ack != "\x06":
            msg = "Bad ack writing block 0x%04x" % addr
            raise errors.RadioError(msg)

         # UI Update
        status.cur = addr / BLOCK_SIZE
        status.msg = "Cloning to radio..."
        radio.status_fn(status)

    _exit_program_mode(radio)