Is it possible to control the D/C pin of a TFT LCD externall

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alexdry
 
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Is it possible to control the D/C pin of a TFT LCD externall

Post by alexdry »

I'm using this TFT LCD (https://www.adafruit.com/product/2090) and for what I need it to do, the reset pin is not necessary, meaning, I tried to use it with the RST pin not connected (in the tutorial it connects to Pi's GPIO 24 https://learn.adafruit.com/adafruit-2-8 ... -and-setup) and it works fine for what I need.
I'm sort of short on pins on Pi's 40 pin header, and tried to use it with the D/C pin unconnected, but that didn't work. Checking the source code, in adafruit_rgb_display/rgb.py, this pin is used in the write() function of the DisplaySPI() class. Is it possible to send a signal in software, say with OSC, and have an external device control this pin, like an Arduino or a Teensy? Would such a setup work? Or would there be latency that would make the setup malfunction?

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