Using the seven segment display driver is rather simple: You can display hex numbers from `0x0` to `0xF` by writing the corresponding **ASCII character** (**not** the raw number!) into the character device file located at `/dev/sevenseg`. Example usage:
Using the seven segment display driver is rather simple: You can display hex numbers from `0x0` to `0xF` by writing the corresponding **ASCII character** (**not** the raw number!) into the character device file located at `/dev/sevenseg`. The character recognition is case-insensitive, so you can write both `a` and `A`, for exmple.
```bash
root@raspberrypi:~# echo 3> /dev/sevenseg
root@raspberrypi:~# echo'3'> /dev/sevenseg
```
This command makes the display show the number `3`, as you most probably figured out on your own. If you want to ensure everything is working fine, you can execute the test script included in the project's root directory:
This command makes the display show the number `3`, as you most probably figured out on your own. You can also leave the quatation marks `'` out, but we consider this to be bad style. If you want to ensure everything is working fine, you can execute the test script included in the project's root directory:
```bash
root@raspberrypi:~/SevenSegController# chmod +x test.sh # Has to be made executeable first
root@raspberrypi:~/SevenSegController# ./test.sh
```
The script will check if the module is loaded correctly. If this is the case, it will automatically count from `0x0` to `0xF`, displaying every number for one second. Remember you have to run the script as root.
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The script will check if the module is loaded correctly. If this is the case, it will automatically count from `0x0` to `0xF`, displaying every number for one second. After that, the display is turned off again. Remember you have to run the script as root.
