topic IMX8MQ UART2(SER2) problem in i.MX Processors

IMX8MQ UART2(SER2) problem

prathap_ponnuch — Mon, 27 Jul 2020 05:10:37 GMT

Hi all,

I am trying UART3(SER2 TX and RX) communication.

Following setting are done:

/* ser2 */&uart3 {         pinctrl-names = "default";         pinctrl-0 = <&pinctrl_uart3>;         assigned-clocks = <&clk IMX8MQ_CLK_UART3>;         assigned-clock-parents = <&clk IMX8MQ_CLK_25M>;         uart-has-rtscts;         status = "okay"; };
             /* ser 2 */                pinctrl_uart3: uart3grp {                         fsl,pins = <                                /* SER2_RX */                                MX8MQ_IOMUXC_ECSPI1_SCLK_UART3_DCE_RX           0xe                                /* SER2_TX */                                MX8MQ_IOMUXC_ECSPI1_MOSI_UART3_DCE_TX           0xe                                /* SER2_CTS_N */                                MX8MQ_IOMUXC_ECSPI1_MISO_UART3_DCE_CTS_B        0xe                                /* SER2_RTS_N */                                MX8MQ_IOMUXC_ECSPI1_SS0_UART3_DCE_RTS_B         0xe                        >;                 }; 
After this,
in console side we given the following command:
note:ttymxc2(tx and rx pin, rts)connected to other host at 115200 baudrate.
root@sm2s-imx8m-qc:~# stty -echo raw speed 115200 < /dev/ttymxc2115200 root@sm2s-imx8m-qc:~# echo "testing" > /dev/ttymxc2              root@sm2s-imx8m-qc:~#    After this commands there is no output in host system?
May i know what is the problem and how to check this uart?
Thanks in advance.

Regards,
prathap

Re: IMX8MQ UART2(SER2) problem

igorpadykov — Mon, 27 Jul 2020 07:40:03 GMT

Hi Prathap

what bsp used in the case, for uart3 dts example one can look at

imx8mq-evk.dts\freescale\dts\boot\arm64\arch - linux-imx - i.MX Linux kernel

test with uart unit test and Demo Image:

mxc_uart_test\test - imx-test - i.MX Driver Test Application Software

Demo Image i.MX 8M Quad EVK

Best regards
igor
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Re: IMX8MQ UART2(SER2) problem

prathap_ponnuch — Mon, 27 Jul 2020 10:29:49 GMT

Hi Igor,

Thanks for replay.

we are using the following path to modify:

linux-imx/4.14.98-r0/git/arch/arm64/boot/dts/msc$ vi msc-sm2s-imx8m-qc-001.dts

Regards,

prathap

Re: IMX8MQ UART2(SER2) problem

igorpadykov — Mon, 27 Jul 2020 10:51:55 GMT

Hi Prathap

if this is third party software may be suggested to post issue to tech support

of vendor of that software.

Best regards
igor