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Merge pull request #4675 from jflyper/bfdev-fix-softserial-disappearing-start-bit

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[SOFTSERIAL] Fix disappearing start bit in SERIAL_BIDIR case.
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Michael Keller 2017-11-30 17:56:40 +13:00 • committed by GitHub
commit f0cf65467b
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1 changed files with 7 additions and 6 deletions
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13
src/main/drivers/serial_softserial.c
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@ -161,11 +161,7 @@ static void serialInputPortDeActivate(softSerial_t *softSerial)
TIM_CCxCmd(softSerial->timerHardware->tim, softSerial->timerHardware->channel, TIM_CCx_Disable);
#endif
#ifdef STM32F1
IOConfigGPIO(softSerial->rxIO, IOCFG_IN_FLOATING);
#else
IOConfigGPIOAF(softSerial->rxIO, IOCFG_IN_FLOATING, softSerial->timerHardware->alternateFunction);
#endif
softSerial->rxActive = false;
}
@ -381,9 +377,14 @@ void processTxState(softSerial_t *softSerial)
// Half-duplex: Deactivate receiver, activate transmitter
serialInputPortDeActivate(softSerial);
serialOutputPortActivate(softSerial);
}
return;
// Start sending on next bit timing, as port manipulation takes time,
// and continuing here may cause bit period to decrease causing sampling errors
// at the receiver under high rates.
// Note that there will be (little less than) 1-bit delay; take it as "turn around time".
// XXX We may be able to reload counter and continue. (Future work.)
return;
}
}
if (softSerial->bitsLeftToTransmit) {