J7200XSOMXEVM: UART Multiplexer

Hi,

I have unlocked the other thread, but there seems to be some issue in that which makes me unable to reply. Please continue the discussion here.

Regards,
Tanmay

Hi Sarthak,

I believe that you are using the main uart 3 to receive the GNSS data through the  SkyTraq EVB  , right?

If that is the case, TX pin is not needed.

Regards

Gokul Praveen

Hi Gokul,

We aren't using it for the GNSSanymore but using as a general RS232.

Regards,
Sarthak Sharma

HI Sarthak,

So, will you be using MAIN UART 3 for transmission? In that case, the Tx pin will be needed

Just to confirm, the SDK version you are using is this , right?

• I'm using ti-processor-sdk-linux-j7200-evm-10_00_07_03 

Yes - I'm using ti-processor-sdk-linux-j7200-evm-10_00_07_03  sdk.

Regards,

Sarthak Sharma

Hi Gokul,

we'll be using MCU_UART, MAIN_UART1, MAIN_UART0, MAIN_UART3, MAIN_UART7, MAIN_UART9

We are using usb as a hub for RS232.

Regards,

Sarthak

Hi Sarthak.

sarthak sharma said:

Regarding the issue clearly stated in that post - it seems that the TX pin in main_uart3 is missing.

The below patch enables the TX pin on main uart 3.

index 068faaaff..b05df0216 100644
--- a/arch/arm64/boot/dts/ti/k3-j7200-common-proc-board.dts
+++ b/arch/arm64/boot/dts/ti/k3-j7200-common-proc-board.dts
@@ -217,6 +217,7 @@ main_uart3_pins_default: main-uart3-default-pins {
                pinctrl-single,pins = <
                        J721E_IOPAD(0x60, PIN_INPUT, 11) /* (T15) MCAN8_TX.UART3_CTSn */
                        J721E_IOPAD(0x30, PIN_INPUT, 11) /* (Y18) MCAN2_TX.UART3_RXD */
+                       J721E_IOPAD(0x7c, PIN_OUTPUT, 11) /* (Y13) MCAN11_RX.UART3_TXD */
                >;
        };
 

Regards

Gokul Praveen