Unable to run the library on SSD1327

Type of Raspberry Pi

RPi 3 B+

Linux Kernel version

Linux raspberrypi 4.19.57-v7+ #1244 SMP Thu Jul 4 18:45:25 BST 2019 armv7l GNU/Linux

Expected behaviour

The examples on SSD1327 should run fine. It works in SPI mode but not in I2C mode.

Actual behaviour

The device is not being detected.

pi@raspberrypi:~ $ i2cdetect -y 1
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
70: -- -- -- -- -- -- -- --                         
pi@raspberrypi:~ $ lsmod | grep i2c
i2c_bcm2835            16384  0
i2c_dev                20480  0

Things I tried

I believe the I2C is setup properly because I ran a test with an i2c circuit using an Arduino as a slave (cf. https://radiostud.io/howto-i2c-communication-rpi/) and i2cdetect was able to find the device.

I also know the I2C device works because I was able to control it using an ESP32 and the U8g2 library. I have two of these devices: both of them work with the ESP32, none of them work on the Pi.

I also tried to change my wires just to make sure, but without any success.

I also tried to change from 3.3V to 5V as Vcc (the SSD1327 can support it) but it also did not change anything.

Wiring

Here is how my device is wired:

SSD1327    RPi3
-----------------------
GND            pin 6
Vcc              pin 1
SDA             pin 3
SCL             pin 5

[ssarna1]

I have the same exact problem as @zsmith-ustc. I have confirmed the display itself working with Arduino and U8G2 library, but other libraries did not worked for me. I came across some other posts stating that some of the displays are not sending ACK back to master device, can this be the cause? If so, can the library get away with not getting ACK signal?

[sofian]

@thijstriemstra We have made tests with another model that has SPI jumper (it is SPI by default) and it was working.