Driver fails with 64x32 display about stm32-ssd1306 HOT 6 CLOSED

No, the library was never tested with 0.49" 64x32 displays. Please make sure you are using proper SSD1306_WIDTH and SSD1306_HEIGHT values https://github.com/afiskon/stm32-ssd1306/blob/master/ssd1306/ssd1306_conf_template.h If you are certain there is a bug please feel free submitting a pull request.

from stm32-ssd1306.

I got the code working now after completely re-doing the ssd1306_Init. I looked into the how u8g2 library does the init for SSD1306 it closely matches the sequence in the datasheet so I used that as a basis. I also had to set SSD1306_X_OFFSET to 32 but I consider that configuration and not a bug. So the delta for the pull request will be considerable and possibly with regressions for other display geometries.

from stm32-ssd1306.

Also got DMA working:

@400kHz iic 4 pages (1 frame) takes around 7 ms. Potential frame rate 140 Hz with zero CPU usage for frame transfer.

from stm32-ssd1306.

as indicated ssd1306_Init() is:

1. not maintainable
2. definitely not working with 64x32 and very likely also not working with other odd formats

In case of issues with the proposed change finding an issue is relatively easy. With the current implementation it is like finding a needle in a haystack as I experienced myself. I took me more then 6 hours to get the 64x32 display working. ssd1306_Init() is a mess and completely diverging from the init in the datasheet.

I2C DMA is nicely implemented with an optional compile switch and there is no dependency with a SPI implementation.

If the pull request is not acceptable for you I will maintain a separate fork or alternative implementation. Without DMA support the applicability of the library for "real" application is limited unless you want to burn CPU cycles with your 32-bit microcontroller.

from stm32-ssd1306.

I took me more then 6 hours to get the 64x32 display working.

Glad that you managed to fix this issue. Please consider submitting a pull request.

If the pull request is not acceptable for you I will maintain a separate fork or alternative implementation. Without DMA support the applicability of the library for "real" application is limited unless you want to burn CPU cycles with your 32-bit microcontroller.

I don't see how DMA is related to this discussion.

from stm32-ssd1306.

Will maintain a fork.

from stm32-ssd1306.