I2c 128x32 Blue OLED LCD Display problem

[karawin]

I am using u8g2 to support a lot of monochrome displays in a software for esp32 with esp_idf (not arduino). using the HAL of https://github.com/nkolban/esp32-snippets/tree/master/hardware/displays/U8G2 It works very well for many 128x64 ssd1306 and sh1106 and many other but i cannot find the right initialization for the 128x32 I2C Oled. I tried u8g2_Setup_ssd1306_i2c_128x32_univision_f u8g2_Setup_ssd1305_i2c_128x32_noname_f without success. With these inits a sh1106 in // shows only a line on the last line of pixels and the 128x32 oled is black.

help ;-) Happy new year

http://pages.ebay.com/link/?nav=item.view&alt=web&id=222740772910

[olikraus]

for the univision device, try to modify the value in this line: https://github.com/olikraus/u8g2/blob/master/csrc/u8x8_d_ssd1306_128x32.c#L51

Try 0x050 or 0x060 instead of 0x040. Will this work?

[karawin]

Thanks for your answer. It is for a customer. I don't have this oled but I bough it and test it soon myself. I will report the test next week in 2018.

ps: on sh1106 0x50 or 0x60 seems to have no effect. Still one line at end.

[olikraus]

you mean the ssd1306 128x32 shows one line with the sh1106 constructor? Maybe you can post a picture.

[karawin]

No, i only tested with the sh1106. We will see that soon. Thanks.

My project embed u8g2 and ucglib with HAL I made. Great library. https://github.com/karawin/Ka-Radio32

[olikraus]

nice project.

[karawin]

Thanks. I am back and with the right lcd now. the ssd1306 128x32 is black but the sh1106 on same i2c shows only a line on the last line. Using u8g2_Setup_ssd1306_i2c_128x32_univision_f With value 0x40 0x50 or 0x60. No change.

With u8g2_Setup_ssd1306_128x64_vcomh0_f the strange thing is that all lines are displayed but compressed. See the picture below

[olikraus]

There should be an alt0 constructor: U8G2_SSD1306_128X64_ALT0_F Can you try this?

[karawin]

Not in c interface u8g2.h and for i2c.

I will try u8g2_Setup_ssd1306_i2c_128x64_alt0 edit; Much better but a shift. Missing some first lines and don't go to the bottom.

Missing a u8g2_Setup_ssd1306_i2c_128x32_alt0

[olikraus]

Missing a u8g2_Setup_ssd1306_i2c_128x32_alt0

Simply spoken: Your OLED is not supported by u8g2. The memory layout of your OLED differs from all known OLEDs.

I think best is to start with the univision constructor: https://github.com/olikraus/u8g2/blob/master/csrc/u8x8_d_ssd1306_128x32.c

The alt0 setting should be correct already (bit 4 should be 0): https://github.com/olikraus/u8g2/blob/master/csrc/u8x8_d_ssd1306_128x32.c#L61

But maybe the start line and display offsets are different for your display: https://github.com/olikraus/u8g2/blob/master/csrc/u8x8_d_ssd1306_128x32.c#L50

As stated initially, we need to try different values here. Somehow I came back to my initial answers.

[karawin]

I think I will fed up.

Nothing is working with u8g2_Setup_ssd1306_i2c_128x32_univision_f I tried to replace u8x8_d_ssd1306_128x32_univision_init_seq but the standard one is good. I tried to replace u8x8_ssd1306_128x32_univision_display_info but without success.

The only way to have some display on it is with u8g2_Setup_sh1106_128x64_noname_f or u8g2_Setup_ssd1306_128x64_vcomh0_f or u8g2_Setup_ssd1306_128x64_noname_f etc but nothing with the univision c interface.

[olikraus]

Hmm difficult to say something without having access to this board

[karawin]

I made it working. In fact i called the init with u8g2_Setup_ssd1306_i2c_128x32_univision_f( &u8g2, U8G2_R0, u8g2_esp32_msg_i2c_cb, u8g2_esp32_msg_i2c_and_delay_cb);

But the answer is u8g2_Setup_ssd1306_128x32_univision_f( &u8g2, U8G2_R0, u8g2_esp32_msg_i2c_cb, u8g2_esp32_msg_i2c_and_delay_cb);

And this is true for all other types. If I call the i2c version of init, it fails. May be because i am using a HAL interface?

[olikraus]

could be, i have not written this HAL.

[karawin]

It seems that https://github.com/nkolban/esp32-snippets/tree/master/hardware/displays/U8G2 is updated for this problem. I close this issue. Thanks for your support.