Zhengdian Atom i.MX93 Development Board] Heterogeneous inter-core communication--5 Heterogeneous core GPIO experiment

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Zhengdian Atom i.MX93 Development Board] Heterogeneous inter-core communication--5 Heterogeneous core GPIO experiment [Copy link]

The heterogeneous core GPIO experiment uses RPMSG's heterogeneous core communication to implement the operation of sending control commands from the A55 core to the M33 core for control execution.

1 Modify the device tree

Modify the kernel device tree file imx93-11x11-atk.dts. Disable Linux's call to the LED driver, that is, assign the status attribute in the LED node to disabled.

The path of the imx93-11x11-atk.dts file is /arch/arm64/boot/dts/freescale/imx93-11x11-atk.dts

After the modification is completed, you need to recompile the device tree and replace the generated imx93-11x11-atk.dtb file into the Linux kernel.

cp imx93-11x11-atk.dtb  /run/media/mmcblk0p1/

2 Program customization and modification

LED0 is connected to GPIO_IO04, so the pin multiplexing needs to be modified (the default SDK file has been modified).

3 Compile M33 core firmware

Enter the 01_rpmsg_rtos_tty_led project folder and execute the build_all.sh script to build the Cortex-M33 firmware file.

4 Loading M33 core firmware

cd /lib/firmware
modprobe imx_rpmsg_tty
./load_remoteproc.sh rpmsg_rtos_led_imxcm33.elf

5 Control Testing

The Cortex-A55 terminal executes the following instructions to control the onboard LED light.

Cortex-A55 终端执行以下指令点亮板载 LED 灯
echo "ON" > /dev/ttyRPMSG<num>

Cortex-A55 终端执行以下指令熄灭板载 LED 灯
echo "OFF" > /dev/ttyRPMSG<num>

During the A55 control process, the Cortex-M33 terminal will print relevant messages, and the controlled red LED will also light up and turn off normally.

rpmsg-led

freebsder

Awesome, let’s learn!