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Forum Index : Microcontroller and PC projects : WARNING: using SDcard slots on displays

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matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 10222
Posted: 10:37pm 29 Jul 2016
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If you are using the MM+ SDcard functionality or my SDcard drivers for the MM2 and are using the SDcard slot on a TFT display you should either:

set up OPTION TOUCH correctly for your wiring or
Set the pin connected to the chip select for the touch controller as an output and set it high. If you don't have a connection to the touch controller chip select add one!

If you don't do one of these there is a significant chance that with the touch chip select floating the touch controller will corrupt the SDcard SPI transactions. It will also corrupt ILI9341 transactions using my enhanced driver that reads from the display memory.

I've just wasted 4-hours on this
 
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