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msp: put the host first in a serial passthrough #12003

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msp: put the host first in a serial passthrough #12003

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8 changes: 7 additions & 1 deletion src/main/fc/fc_msp.c
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Original file line number Diff line number Diff line change
Expand Up @@ -223,7 +223,13 @@ static void mspSerialPassthroughFn(serialPort_t *serialPort)
{
serialPort_t *passthroughPort = mspFindPassthroughSerialPort();
if (passthroughPort && serialPort) {
serialPassthrough(passthroughPort, serialPort, NULL, NULL);
// The port the request came in on goes first, as it does in the CLI. Both of the
// things serialPassthrough() does for whoever opened the session are done for its
// first port only: the +++ that ends the session is looked for there, and a USB
// host's line coding is mirrored onto the other port from there. Passed the other
// way round, a session opened over MSP could not be closed and could not raise the
// rate of the port it opened, which is what an SRXL2 ESC negotiates up to 400000
serialPassthrough(serialPort, passthroughPort, NULL, NULL);
}
}

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