i.MX ProcessorsのトピックRe: Serial communication in iMX6ULL

Serial communication in iMX6ULL

mathew_k_t — Mon, 19 Feb 2018 05:12:33 GMT

Hi,

I have configured UART2 as follows,

&uart2 {
   pinctrl-names = "default";
   pinctrl-0 = <&pinctrl_uart2>;
   status = "okay";
};

pinctrl_uart2: uart2grp {
           fsl,pins = <
               MX6UL_PAD_UART2_TX_DATA__UART2_DCE_TX     0x1b0b1
                MX6UL_PAD_UART2_RX_DATA__UART2_DCE_RX     0x1b0b1
           >;
       };

For testing, I tried loopback. But I'm not getting any response.

For loopback I have shorted 1&2 in J1703. I probed TX pin and found that data is transmitting.But nothing received in console.

Also, I tried UART1(default configuartion in imx6ull). For that I'm getting responses.

Could you mention the mistakes in above?

Regards

Re: Serial communication in iMX6ULL

igorpadykov — Mon, 19 Feb 2018 07:07:09 GMT

Hi mathew_k_t

uart2 example can be found on linux/arch/arm/boot/dts/imx6ull-14x14-evk.dts :

linux-imx.git - i.MX Linux Kernel

in particular one can pay attention to fsl,uart-has-rtscts, DTE mode properties

Best regards
igor
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Re: Serial communication in iMX6ULL

mathew_k_t — Mon, 19 Feb 2018 10:04:41 GMT

Thank you for your response.

I modified the dts file according to the reference. But the issue not resolved.

Regards

Re: Serial communication in iMX6ULL

igorpadykov — Mon, 19 Feb 2018 10:41:40 GMT

one can attach jtag and check uart registers: data ready RDR bit,

Best regards
igor

Re: Serial communication in iMX6ULL

mathew_k_t — Tue, 20 Feb 2018 13:56:21 GMT

Hi Igor,

It is found that the UART2 is working at a baud rate of 9600. Because I'm able to receive data when set serial port at 9600. How to change this baud rate to 115200. I tried changing baud rate variable to 115200. But failed to produce output. How to resolve this issue?

regards