topic Re: RT1172 lpuart use Single-wire operation mode can not transmitter data in i.MX RT Crossover MCUs

RT1172 lpuart use Single-wire operation mode can not transmitter data

496387703 — Thu, 16 Nov 2023 03:27:20 GMT

hi all:

when I use lpuart Single-wire operation mode. Unable to send data.

CTRL[LOOPS] = 1, CTRL[RSRC] = 1. enable TX and RX. setBaudRate 9600

CTRL[TXDIR] = 1;

LPUART_WriteBlocking(LPUART4, 0xF0,1 )

But no data measured using an oscilloscope.

TX pin external pull-up resistor（4.7K）

How to send data correctly？Please indicate any areas that need attention.

Regards

496387703 — Thu, 16 Nov 2023 04:02:34 GMT

so sorry, send data is ok

but,when I use LPUART_ReadBlocking()，the base->STAT is error，Unable to receive data

EdwinHz — Wed, 22 Nov 2023 01:26:23 GMT

Please make sure you are adequately following the description seen in Section "71.3.6.4 Single-wire operation" of the Reference Manual. You can also base your code from the following post: https://community.nxp.com/t5/Kinetis-Microcontrollers/Issue-with-LPUART-single-wire-mode-on-KL17/m-p/577831

BR,
Edwin.

496387703 — Sat, 02 Dec 2023 11:33:47 GMT

hi Edwin:

But, it`s also cannot work. Unable to receive data。