topic Re: Enabling RTS_b for Transmitter request-to-send in Kinetis Microcontrollers

Enabling RTS_b for Transmitter request-to-send

amerzater — Sun, 07 Jul 2019 13:35:04 GMT

on MKV10z32 , (MCUxpresso- SDK2.2.0) , I am using hardware flow control on the transmitter (RTS_b) to control the Rs485 line driver.

UART->MODEM=(1<<(TXRTSPOL)) | (1<<(TXRTSE)) ;

but I realized that enabling the previous line is affecting the RXD line so no reception is taking place despite of that the signal on the rxd pin of the MCU is quite good and noise-free.

when theTXRTSE is disabled, and the transmitter control is handled manually. the reception is working just fine and the data is well received.

Re: Enabling RTS_b for Transmitter request-to-send

nxf54945 — Mon, 08 Jul 2019 23:27:09 GMT

Hi Amer,

The KV10 requires that UARTx_C2[TE] is set before UARTx_MODEM[TXRTSE] is asserted. Could you please check this criteria is met?

Best regards

Javier

Re: Enabling RTS_b for Transmitter request-to-send

amerzater — Mon, 15 Jul 2019 14:41:10 GMT

Many thanks for your help..

setting UARTx_C2[TE] befor handling modem bits has soldved the problem .