SPI Dot-Matrix

Net Name	Pin Number	Pin Number	Net Name
3.3V	1	2	5.0V
Not Used	3	4	5.0V
Not Used	5	6	GND
Not Used	7	8	Not Used
GND	9	10	Not Used
Not Used	11	12	Not Used
Not Used	13	14	GND
Not Used	15	16	Not Used
3.3V	17	18	Not Used
MOSI	19	20	GND
Not Used	21	22	Not Used
SCK	23	24	CE0
GND	25	26	Not Used

LED Matrix Shield is available on this version of the kernel.
- ODORID-C2: 3.14.29-32 or higher
- ODROID-XU4: 3.10.82 or higher
This guide is tested by,
- ODROID-C1+: ubuntu-16.04.2-mate-odroid-c1-20170220.img
- ODROID-C2: ubuntu64-16.04.2lts-mate-odroid-c2-20170301.img
- ODROID-XU4: ubuntu-16.04.2-mate-odroid-xu4-20170510.img
- ODROID-N2: ubuntu-18.04.2-4.9-minimal-odroid-n2-20190217.img.xz
- ODROID-C4: TBD

You have to enable SPI feature first to use this shield.

Please refer to this guide.

Make sure that the SPI feature on your Odroid is enabled correctly. A short way to check out is finding spidev file under /dev directory.

See the following.

root@odroid:~# ll /dev/spidev*
crw------- 1 root root 153, 0 Apr  3 09:17 /dev/spidev0.0

git clone https://github.com/codewalkerster/led_matrix_shiled.git
./build.sh

Execute that built file, and you can see the results like the below.

odroid@odroid64:~$ sudo ./dot_test
spi mode: 0
bits per word: 8
max speed: 500000 Hz (500 KHz)

In Odroid-C2, although you set to 500 KHz, it actually operates at 390KHz since C2 runs SPI in the bit-banging method.

git clone https://github.com/codewalkerster/led_matrix_shiled.git
./build.sh

Execute that built file, and you can see the results like the below.

odroid@odroid64:~$ sudo ./dot_shift_test
max speed: 1000000 Hz (1000 KHz)

git clone https://github.com/codewalkerster/led_matrix_shiled.git
cd wiringpi
./build.sh

Execute that built file, and you can see the results like the below.

odroid@odroid64:~$ sudo ./dot_shift_test
max speed: 1000000 Hz (1000 KHz)

Enable SPI