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GPIO

BeagleV Ahead has cape header pins similar to BeagleBone Black. You can check the documentation page below to know the pin connection to TH1520 SoC:

https://beaglev-ahead.beagleboard.io/docs/latest/boards/beaglev/ahead/connectros.html

To test the GPIO functionality of the pins you can follow steps below:

Clone BeagleBoard-DeviceTrees

Access the shell with the help of debug.md
Connect to WiFi usig WiFi.md
Change directory to home using like below:
```
beagle@BeagleV:~$ cd
```

Clone the repo using command below:

beagle@BeagleV:~$ git clone https://git.beagleboard.org/beaglev-ahead/BeagleBoard-DeviceTrees.git

Provide your credentials and the wait for cloning to complete.

Teset gpio-leds with BONE-LED

Follow the steps below to test,

change the directory to home,
```
 ```
 beagle@BeagleV:~$ cd
 ```
```

If not already cloned clone the BeagleBoard-DeviceTrees repo,

beagle@BeagleV:~$ git clone https://git.beagleboard.org/beaglev-ahead/BeagleBoard-DeviceTrees.git

Change directory to the repo,

beagle@BeagleV:~$ cd BeagleBoard-DeviceTrees/

This step is not required for the first run but handy for further debugging,
```
beagle@BeagleV:~$ make clean
```
make all the devicetree files and overlays for riscv
```
beagle@BeagleV:~$ make all_riscv
```

Until uboot overlays support is functional you can use this command to update the base device tree file to include our overlay,

beagle@BeagleV:~$ fdtoverlay \
-i src/riscv/light-beagle.dtb \
-o src/riscv/light-beagle.dtb \
src/riscv/overlays/BONE-LED_P8_03.dtbo

Install all the files to your board,

beagle@BeagleV:~$ sudo make install_riscv

Reboot your board,
```
beagle@BeagleV:~$ sudo reboot
```
You should see LED blinking if connected to P8_03.

Testing other pins

The overlay can be updated for other header pins and same steps can be used to test the pins as well.

You'll have to change this line according to the pin you want to use.

NOTE: It's okay if you don't change anything else like file name and other parts of the overlay to test other pins, you just have to change the reference according to the pin you want to test.

For P8_03 the reference used is bone_led_P8_03 for other pin like P8_04 you need to change it to bone_led_P8_04. For example, testing P8_22 will require you to make the change below:

&bone_led_P8_22 {
    status = "okay";
    // access: sys/class/leds/led_P8_22
    label = "led_P8_22";
    linux,default-trigger = "heartbeat";
    default-state = "on";
};

please note that this is only the portion of the code we need to edit, everything else can be exactly the same unless you really see the need to change it for yourself because it will not affect the testing procedure of the pin.

Capes

Overlays for LOAD cape and Relay cape are also available to test under overlays folder,

https://git.beagleboard.org/beaglev-ahead/BeagleBoard-DeviceTrees/-/tree/v5.10.x-ti-unified/src/riscv/overlays