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AM6442: CC1312R1F3RGZT with AM6442

Embedded Eng.
Prodigy 130 points
Part Number: AM6442


SW: Linux SDK 08.00.00.004

Hi,

My custom board has a AM6442 CPU and a CC1312R1F3RGZT SUB-G.

CC1312R1F3RGZT <-> AM6442 communication should be over UART.

Used balls: C9 (MCU_UART1_RXD) and D9 (MCU_UART1_TXD).

I added this uart in device tree, but could not find it in /dev directory, how this device should appear in /dev ?

I could not find any example for CC1312R1F3RGZT usage with Linux, maybe you can refer me to one?

 

Here is the device tree part I added in order to use the UART:

mcu_uart1_pins_default: mcu-uart1-pins-default {
	pinctrl-single,pins = <
		AM64X_MCU_IOPAD(0x4038, PIN_INPUT, 0) /* (C9) MCU_UART1_RXD */
		AM64X_MCU_IOPAD(0x403C, PIN_OUTPUT, 0) /* (D9) MCU_UART1_TXD */
	>;
};



&mcu_uart1 {
	pinctrl-names = "default";
	status = "okay";
	pinctrl-0 = <&mcu_uart1_pins_default>;
};

Am I missing something?

Thanks

  • 0
    TI__Guru**** 171661 points

    Hi,

    Please check the kernel patches mentioned in the e2e post below for enabling MCU UART1 in Processor SDK v8.0 Linux kernel..

    e2e.ti.com/.../3894837

  • 0 in reply to Bin Liu
    Prodigy 130 points

    Thanks,

    I applied the patches:

    * 7077.0001-arm64-dts-ti-k3-am64-mcu-Add-support-for-wkup-pinmux.patch

    * 0002-arm64-dts-ti-k3-am642-evm-enable-mcu_uart1-with-pinm.patch (I did it in my devicetree, not in the EVM's)

    * 0003-arm64-dts-ti-k3-am64-mcu-remove-clock-frequency-from.patch

    I also unlocked the MMR region in U-boot.

    I still can see no difference, how this device should appear? should I see it in /dev directory?

    I could not find any example for CC1312R1F3RGZT usage with Linux, maybe you can refer me to one?

    Thanks

  • 0 in reply to Embedded Eng.
    TI__Guru**** 171661 points

    I am not familiar with CC1312R1F3RGZT, but any serial device connected to AM64x UART port can be communicated with Linux tty program which accesses the corresponding UART port. The AM64x MCU_UART1 port is represented as /dev/ttyS1 device node in Linux.

  • 0 in reply to Bin Liu
    Prodigy 130 points

    Since /dev/ttyS1 appears even if I don't enable MCU UART, I was sure this is not the relevant device.

    Now I tried to connect to the device using picocom and it fails if MCU UART is not enabled, so you're right, thanks!

    I will ask about the CC1312R1F3RGZT device in the Sub-1 GHz Group forum.

    Thanks!!

  • 0 in reply to Embedded Eng.
    TI__Guru**** 171661 points

    Glad you made the progress. Thanks for the update.

    There are different places in Linux (dmesg, sysfs, procfs) to check details of each enabled UART port. But the quickest way I use to check which UARTs are enabled is to check dmesg log right after Linux is booted.

    dmesg | grep ttyS