SPI Dot-Matrix
ODROID-C1/C1+/C2
ODROID-XU4
ODROID-XU4 with shifter shield
LED Matrix Shield is available on this version of kernel.
- ODORID-C2 - 3.14.29-32 or higher
- ODROID-XU4 - 3.10.82 or higher
And 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
How to use SPI
Prepare SPI on ODROID-XU4
To use spidev on your ODROID-XU4 you should fix device tree source.
To use the SPI, you first need to update the kernel version to “3.10.82” or higher.
sudo apt update && sudo apt dist-upgrade
How to enable driver (Only Ubuntu 16.04 or higher is required)
Edit /etc/modprobe.d/blacklist-odroid.conf to comment out following two ines.
blacklist spidev blacklist spi_s3c64xx
Reboot.
reboot
Prepare SPI on ODROID-C2
Since the C2 doesn't support Hardware SPI. This Example is using the GPIO-based bitbanging SPI Master.
In this case, the maximum clock is about 390KHz.
Update the Kernel first. This module drivers are available on 3.14.29-32 or higher.
odroid@odroid64:~$ sudo modprobe spi-bitbang odroid@odroid64:~$ sudo modprobe spi-gpio odroid@odroid64:~$ sudo modprobe spidev odroid@odroid64:~$ lsmod Module Size Used by spidev 5785 0 spi_gpio 5978 0 spi_bitbang 3637 1 spi_gpio fuse 77425 3 autofs4 24813 2 odroid@odroid64:~$
Prepare SPI on ODROID-C1/C1+
root@odroid:~# lsmod Module Size Used by uinput 6669 1 ir_lirc_codec 4243 3 lirc_dev 10110 1 ir_lirc_codec ir_mce_kbd_decoder 3092 0 ir_sanyo_decoder 1638 0 ir_sony_decoder 1667 0 ir_jvc_decoder 1664 0 ir_rc6_decoder 2024 0 ir_rc5_decoder 1552 0 ir_nec_decoder 1776 0 meson_ir 2902 0 joydev 8607 0 hid_logitech_dj 11642 0 fuse 70879 2 nls_cp437 5125 1
root@odroid:~# modprobe spicc
root@odroid:~# lsmod Module Size Used by ads7846 13766 0 spidev 5465 0 spicc 7846 0 uinput 6669 1 ir_lirc_codec 4243 3 lirc_dev 10110 1 ir_lirc_codec ir_mce_kbd_decoder 3092 0 ir_sanyo_decoder 1638 0 ir_sony_decoder 1667 0 ir_jvc_decoder 1664 0 ir_rc6_decoder 2024 0 ir_rc5_decoder 1552 0 ir_nec_decoder 1776 0 meson_ir 2902 0 joydev 8607 0 hid_logitech_dj 11642 0 fuse 70879 2 nls_cp437 5125 1
Check the SPI
C1/C1+/C2
odroid@odroid64:~$ ls /dev/spidev0.0 /dev/spidev0.0 odroid@odroid64:~$
XU4
odroid@odroid:~$ ls /dev/spidev* /dev/spidev1.0 odroid@odroid:~$
Compile & run SPI test example source code
Example code : dot_test.c
odroid@odroid64:~$ wget https://dn.odroid.com/Accessory/examples/Dot-Matrix/dot_test.c odroid@odroid64:~$ gcc -o dot_test dot_test.c
odroid@odroid64:~$ sudo ./dot_test spi mode: 0 bits per word: 8 max speed: 500000 Hz (500 KHz)
- ODROID-C2 - Set to 500 KHz, but it is actually operating at 390KHz.
Example of Scrolling Text
Example code : dot_shift_test.c dotfont.h
WiringPi SPI API use case :
Uncomment this line first. #define USE_WIRING_PI_LIB
Build the example with proper library option. if defined USE_WIRING_PI_LIB
Compile : gcc -o <create excute file name> <source file name> -lwiringPi -lwiringPiDev -lpthread
else
Compile : gcc -o <create excute file name> <source file name>
spidev node : dot_shift_test.c line 68-69 (Uncomment each model)
#define SPIDEV_NODE_NAME "/dev/spidev0.0" // ODROID-C1/C1+/C2 //#define SPIDEV_NODE_NAME "/dev/spidev1.0" // ODROID-XU3/XU4
odroid@odroid64:~$ wget https://dn.odroid.com/Accessory/examples/Dot-Matrix/dot_shift_test.c odroid@odroid64:~$ wget https://dn.odroid.com/Accessory/examples/Dot-Matrix/dotfont.h odroid@odroid64:~$ gcc -o dot_shift_test dot_shift_test.c
odroid@odroid64:~$ sudo ./dot_shift_test max speed: 1000000 Hz (1000 KHz)
