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UART communication in am62a EVM board

meng Ke
Intellectual 910 points
Part Number: AM62A7

Tool/software:

root@am62axx-evm:/opt/edgeai-gst-apps# ls /dev/ttyS*
/dev/ttyS0  /dev/ttyS1  /dev/ttyS10  /dev/ttyS11  /dev/ttyS2  /dev/ttyS3  /dev/ttyS4  /dev/ttyS5  /dev/ttyS6  /dev/ttyS7  /dev/ttyS8  /dev/ttyS9

There are uart port form port 0 to port 11. but i can only SOC_UART0/SOC_UART1/WUP_UART0/MCU_UART0 in the evm.

how dose the port link. If i using open the driver /dev/ttyS2 . Which port is open in the board?

  • 0
    TI__Guru**** 167551 points

    Hi Meng,

    Please use command "cat /proc/tty/driver/serial" to check.

    # cat /proc/tty/driver/serial
serinfo:1.0 driver revision:
0: uart:unknown port:00000000 irq:0
1: uart:unknown port:00000000 irq:0
2: uart:8250 mmio:0x02800000 irq:311 tx:20983 rx:225 RTS|CTS|DTR
3: uart:unknown port:00000000 irq:0
4: uart:unknown port:00000000 irq:0
5: uart:unknown port:00000000 irq:0
6: uart:unknown port:00000000 irq:0
7: uart:unknown port:00000000 irq:0
8: uart:unknown port:00000000 irq:0
9: uart:unknown port:00000000 irq:0
10: uart:unknown port:00000000 irq:0
11: uart:unknown port:00000000 irq:0

    In the example above, /dev/ttyS2 is linked to SOC_UART0 (as shown by mmio:0x02800000). The rest of "unknown" /dev/ttyS* are not linked to any real UART port.

  • 0 in reply to Bin Liu
    Intellectual 910 points

    SOC_UART0 is used for log. And I want to send period message to SOC with the other port. which Uart port should i set. Is the SOC_UART1  avaliable?
    which ttySx should i open?

  • 0 in reply to meng Ke
    Intellectual 910 points

    &wkup_uart0 {
            /* WKUP UART0 is used by DM firmware */
            bootph-pre-ram;
            status = "reserved";
            pinctrl-names = "default";
            pinctrl-0 = <&wkup_uart0_pins_default>;
    };

    &main_uart0 {
            bootph-all;
            status = "okay";
            pinctrl-names = "default";
            pinctrl-0 = <&main_uart0_pins_default>;
            interrupts-extended = <&gic500 GIC_SPI 178 IRQ_TYPE_LEVEL_HIGH>,
                                   <&main_pmx0 0x1c8>; /* (D14) UART0_RXD PADCONFIG114 */
            interrupt-names = "irq", "wakeup";
    };

    &main_uart1 {
            /* Main UART1 is used by TIFS firmware */
            bootph-pre-ram;
            status = "reserved";
            pinctrl-names = "default";
            pinctrl-0 = <&main_uart1_pins_default>;
    };
    I check the dts file. It seems that the dts of uart1 is reaserved. So i need to set the dts for uart1 to enable this device.
    if there are example for setting the uart1. I have no idea how to set the interrupt? thanks very much

  • +1 in reply to meng Ke
    TI__Guru**** 167551 points

    You don't need to change the interrupt. Please refer to the link below for enabling an UART in kernel.

    https://dev.ti.com/tirex/explore/node?node=A__AUDMqu6z4X-MtcRNFPmsuw__AM62A-ACADEMY__WeZ9SsL__LATEST&placeholder=true