I'm trying to use the ssd1306(i2c) and it works fine, until i insert the sd card reader(spi, even he if used alone no problems), because when i start the sd, after the next display.display() the code slows down to 4 seconds and the display doesn't update more. I'm using an stm32 with stm32duino, i have 64kb of sram, so i think the problem isn't the sram
Most likely there is a problem with the wiring or the code, or both.
Unfortunatelyhe the wiring is correct and the code too, i have already tested it a lot of times (display work well without the sd reader, and when is present the display.display() function block the screen and slow down the code, but the code still work and the sd card too)
If you say so, fine.
Good luck with your project.
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Resolved, the problem wasn't the wiring but a soldered bridge on the board between the A5 pin where i connected the sc, and the D5 that is the i2c
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