topic Re: Trying to enbale UART CTS and RTS flow control not working on imx93 in i.MX Processors

Trying to enbale UART CTS and RTS flow control not working on imx93

arun_mozhi_thevan — Thu, 19 Dec 2024 10:17:56 GMT

Use two NXP-IMX93 custom board and use dupont cable connect to each other , DUT 's UART_B_TX (Pin5) to Server's UART_B_RX (Pin6) , DUT 's UART_B_RTS# (Pin7) to Server's UART_B_CTS# (Pin8)

open minicom on DUT board with hardware flow control enbaled and echo "ABCD" > /dev/ttyLP6 on another server module , but we could not able to get data

while trying to send data from DUT to server through UART , we could not able to send data ,

Please suggest me any fix the solve the issue?

Re: Trying to enbale UART CTS and RTS flow control not working on imx93

June_Lu — Tue, 07 Jan 2025 01:11:03 GMT

You could refer to the DTS below:

https://github.com/nxp-imx/linux-imx/blob/lf-6.6.y/arch/arm64/boot/dts/freescale/imx93-11x11-evk-lpuart.dts#L33

Using command:

stty -F /dev/ttyLPx crtscts to turn it on.

And then echo and cat command.

Good reference:

https://community.nxp.com/t5/i-MX-Processors/i-MX6-how-to-use-RTS-CTS-properly-using-UART-DTE-DCE/m-p/460022