Adafruit SSD1306 OLED Display Driver for Raspberry Pi

[Charles]

As I had some questions by mail about my SSD1306 SPI and I2C driver port for Raspberry, I decided to get back to this driver and write some documentation. The first time I wrote it, I tested with SPI oled but did… Continue Reading

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[tito]

hello,
I purchased a 128x64 SSD1306 and installed as you described:
git clone https://github.com/hallard/ArduiPi_SSD1306.git
cd ArduiPi_SSD1306
sudo make
cd examples
sudo make

i2c for other devices is working fine on i2c-1.

But after srarting in the examples folder
./ssd1306_demo --verbose --oled 3
#or alternatively
./ssd1306_demo --verbose --oled 4
then I always get an error:
./ssd1306_demo --verbose --oled 4
ssd1306_demo v1.1
-- OLED params --
Oled is : Seeed I2C 128x64
-- Other Stuff --
verbose is : yes

bcm2835_init: Unable to open /dev/mem: Permission denied

what am I doing wrong?

[tito]

I also had added
i2c-bcm2708
i2c-dev
to /etc/modules,
but still the same.
so what might be still wrong?

[tito]

i2c OLED display is from China, i2c addr is 0x3c, attached to i2c-1, correctly detected by
i2cdetect -y 1

not working with your ssd1306-oled examples nevertheless.

[tito]

partially resolved -

1. commands have to beexecuted as sudo
2. old 1306 drivers don't work, I have to use new driver lib and display no. 6 (no idea why, but anyway...).