New Adafruit generic OLED display driver for Raspberry PI
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Ok. I changed the Raspberry Pi wiring back to Adafruit. I can run Adafruit's Python examples okay. I changed those 2 lines in 'ArduiPi_OLED_lib.h'. I 'sudo make' the library files, and 'sudo make' the example. When I run 'sudo ./oled_demo -o 1' nothing happens.
I put some 'printf' commands in the example for debugging, and it seems to lock up after it calls 'display.begin()'.
I can't find where the function display.begin() is so I can diagnose/debug it further.
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I downloaded the older ArduiPi_SSD1306 and tried that, but same thing. Freezes after it runs 'display.begin()'. I changed the RESET and DC in the .h file as you mentioned. I don't understand why I can't access the display in C++, but Python works perfectly. I'm using a Raspberry Pi 2 if that makes a difference, and an SSD1306 1.3" 128x64 purchased from Adafruit.
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Update: I setup my OLED in I2C mode and changed the address to 3D, and it worked. But I would still rather use SPI mode.
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That's an interesting point, I did not tried on a PI V2, I have one at home, I need to test just in case, because the driver relies on old BCM2835 library that may be I need to update for PI V2, worth checking.
Good to know it works with I2C but I understand you prefer SPI, for sure it's so much faster.
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Hi, Charles. Any progress with testing the library on a PI v2? Is the BCM2836 extremely different than the BCM2835?
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Thank you for the detailed blog post. I followed your instructions and got 2 problems :
- there is no libi2c available, the only thing similar I've found is libi2c-dev so I installed that;
- I got error messages while trying to "sudo make" within the example folder, here is a photo showing the result.
http://i.imgur.com/MkWvXbC.jpg
Btw I am on a Pi B V2. One strange thing is that when I ran "sudo i2cdetect -y 1" there is nothing on the table. But while I tried to use Adafruit_SSD1306 library, the oled would respond (weirdly).
Thanks
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the i2c smbus_ is a know problem
you just need to intall again lm-sensors package (even if correctly installed) then all shoud go fine. Something obvious I’d like to understand, but it seems to work.
look below how I resolved it.
root@pi03:~/github/ArduiPi_SSD1306/examples# make g++ -Ofast -mfpu=vfp -mfloat-abi=hard -march=armv6zk -mtune=arm1176jzf-s -Wall -lssd1306 ssd1306_demo.cpp -o ssd1306_demo /usr/local/lib/libssd1306.so: undefined reference to `i2c_smbus_write_i2c_block_data' /usr/local/lib/libssd1306.so: undefined reference to `i2c_smbus_write_byte_data' /usr/local/lib/libssd1306.so: undefined reference to `i2c_smbus_write_word_data' collect2: ld returned 1 exit status make: *** [ssd1306_demo] Error 1 root@pi03:~/github/ArduiPi_SSD1306/examples# dpkg --get-selections | grep i2c i2c-tools install libi2c-dev install root@pi03:~/github/ArduiPi_SSD1306/examples# dpkg --get-selections | grep lm lm-sensors install root@pi03:~/github/ArduiPi_SSD1306/examples# apt-get install lm-sensors Reading package lists... Done Building dependency tree Reading state information... Done lm-sensors is already the newest version. The following packages were automatically installed and are no longer required: libblas3gf liblapack3gf Use 'apt-get autoremove' to remove them. 0 upgraded, 0 newly installed, 0 to remove and 14 not upgraded. root@pi03:~/github/ArduiPi_SSD1306/examples# make clean rm -rf ssd1306_demo teleinfo-oled root@pi03:~/github/ArduiPi_SSD1306/examples# cd .. root@pi03:~/github/ArduiPi_SSD1306# make clean rm -rf *.o libssd1306.* /usr/local/lib/libssd1306.* root@pi03:~/github/ArduiPi_SSD1306# make g++ -Wall -fPIC -fno-rtti -Ofast -mfpu=vfp -mfloat-abi=hard -march=armv6zk -mtune=arm1176jzf-s -c Adafruit_SSD1306.cpp ./ArduiPi_SSD1306.h:51:21: warning: ‘oled_type_str’ defined but not used [-Wunused-variable] g++ -Wall -fPIC -fno-rtti -Ofast -mfpu=vfp -mfloat-abi=hard -march=armv6zk -mtune=arm1176jzf-s -c Adafruit_GFX.cpp ./ArduiPi_SSD1306.h:51:21: warning: ‘oled_type_str’ defined but not used [-Wunused-variable] gcc -Wall -fPIC -Ofast -mfpu=vfp -mfloat-abi=hard -march=armv6zk -mtune=arm1176jzf-s -c bcm2835.c g++ -shared -Wl,-soname,libssd1306.so.1 -Ofast -mfpu=vfp -mfloat-abi=hard -march=armv6zk -mtune=arm1176jzf-s -o libssd1306.so.1.0 Adafruit_SSD1306.o Adafruit_GFX.o bcm2835.o [Install Library] [Install Headers] root@pi03:~/github/ArduiPi_SSD1306# cd examples/ root@pi03:~/github/ArduiPi_SSD1306/examples# make g++ -Ofast -mfpu=vfp -mfloat-abi=hard -march=armv6zk -mtune=arm1176jzf-s -Wall -lssd1306 ssd1306_demo.cpp -o ssd1306_demo g++ -Ofast -mfpu=vfp -mfloat-abi=hard -march=armv6zk -mtune=arm1176jzf-s -Wall -lssd1306 teleinfo-oled.cpp -o teleinfo-oled root@pi03:~/github/ArduiPi_SSD1306/examples#For the i2cbus detection, nothing to do with my lib, i2cdetect is a tool distribued with your linux distro.
So to be sure I've just gone on my PI V2 to test
root@pi01(rw):~/ArduiPi_OLED/examples# i2cdetect -y 1 0 1 2 3 4 5 6 7 8 9 a b c d e f 00: -- -- -- -- -- -- -- -- -- -- -- -- -- 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 30: -- -- -- -- -- -- -- -- -- -- -- -- 3c -- -- -- 40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 70: -- -- -- -- -- -- -- --root@pi01(rw):~/ArduiPi_OLED/examples# ./oled_demo -o 3 x: 9y: 0dy: 3 x: 30y: 0dy: 2 x: 111y: 0dy: 2 x: 81y: 0dy: 4 x: 41y: 0dy: 2 x: 85y: 0dy: 5So @Mr_Tom yes it works on Pi V2 (at least in I2C mode) but should be the same for SPI; look below
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I've got the lm-sensors module in there, and the make on examples worked.
But only still I can't get my Pi to recognize my oled screen, and I have another device on the i2c bus which works perfectly.
I just ordered another oled (a seeed 96*96) to see if that would work.Thank you for your detailed reply!
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Meng,
Even if Seeed OLED will be seen, it won't work because it"s another driver in it (SSD1308) and I didn't port this one in the example code, something I wanted to do but never had time do do it.
By the way Seeed OLED 96x96 is the best OLED I ever saw, excellent display and gray level.
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Meng
did you tried your non working OLED on an Arduino with I2CScan sketch just to see ? -
Hi, Charles,
I've tested my oled with I2CScan, and it wasn't detected... maybe a broken one. And I have another oled screen here which can be detected on Arduino, but not on Pi.
Here is a library by Seeed themselves : https://github.com/DexterInd/GrovePi/tree/master/Software/Python/grove_oled
I'll see if that would work once the oled screen arrives. Happy to know that it looks amazing. -
Meng,
yeah Seeed library works fine on Arduino, but not sure there is a port on Raspberry Pi -
This 96*96 oled screen is detected by my Pi and it is working with Seeed's own library, and it would also put out stuff while running your oled_demo.
Does your library has a manual? It doesn't looks like python when I peek into your library files... Sorry I am quite a beginner. Thank you.
I use my Pi to generate sound, and if I do oled operations within the same piece of .py file that does sound, any oled writing operations would block the sound. But if I open 2 terminal instances (I am using SSH), and run sound code on one, oled code on another, it wouldn't block the sound. So it is certainly not a CPU speed issue...
Why does this happen? And if I make my Pi running some python code at boot, how I can make the codes running like within multiple terminals?
Thank you!
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I also try to run it on RPi2 with an SPI OLED 128x64 and ran into the same problem. The program freezes in display.begin(). What can be wrong?
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Hi gbona,
Did you checked that your I2C oled is visible with i2cdetect ? If so does his I2C address is 0x3C ? -
Hi Charles. I am trying to use your library to drive a 128x64 SPI OLED display I got from the internet. It is advertised as being SSD1106 (which I assume means SH1106). I have hacked the CS detect line of your code to force it to use SPI instead of the default I2C (this display has no CS pin). I am getting something on the display, but quite garbled.
Here is a video of it running your OLED_demo. https://youtu.be/bETtabNliYc
Are these symptoms familiar to you. Any ideas of what might need tweaking.
Many thanks
Graham
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@boik,
Strange, first time I see SPI oled without CS line, would you mind post a picture of the back ?You're right I forgot to add SPI option for SH1106 in oled_demo.
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Hi Charles,
[IMG]http://i68.tinypic.com/6zwsjl.jpg[/IMG]
Heres a pic of it running the circle, square, triangle cross demo. Just displays the bottom 8 lines of the image but at the top of the OLED.
[IMG]http://i64.tinypic.com/2mhbn7k.jpg[/IMG]
Not sure if this forum accepts IMG tags?
Graham
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Hello Charles
I got a freebox server out of ordre.
There is a ssd1327 screen on it.
If i send you the pcb pictures can you help me to find the good pin to plug it to my PI ?
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@Deennoo
you can post the picture on the forum, may be some other will know, because I'm not sure I will.
