i.mx6 uart tx

niklasmolin — Tue, 06 May 2014 16:38:56 GMT

Hi.

I'm trying to use the UART5 on the i.mx6 on our board (Yocto project).

I'm using minicom as a terminal and it works fine to receive data, but I can't see any activity on the TX pin (CSI0_DAT14).

I have also tried to write small test code to write on the UART, but the same result.

Anyone who has a suggestion what could be wrong?

Is there anything I need to think of when setting up the UART in my device tree file?

My current settings:

uart5: serial@021f4000 {

compatible = "fsl,imx6q-uart", "fsl,imx21-uart";

reg = <0x021f4000 0x4000>;

interrupts = <0 30 0x04>;

clocks = <&clks 160>, <&clks 161>;

clock-names = "ipg", "per";

dmas = <&sdma 33 4 0>, <&sdma 34 4 0>;

dma-names = "rx", "tx";

status = "disabled";

};

uart5 {

pinctrl_uart5_1: uart5grp-1 {

fsl,pins = <

MX6QDL_PAD_CSI0_DAT15__UART5_RX_DATA 0x1b0b1

MX6QDL_PAD_CSI0_DAT14__UART5_TX_DATA 0x1b0b1

};

&uart5 {

pinctrl-names = "default";

pinctrl-0 = <&pinctrl_uart5_1>;

status = "okay";

};

Thanks,

Niklas

Re: i.mx6 uart tx

niklasmolin — Tue, 06 May 2014 17:11:21 GMT

Seems like I had HW flow control enabled.