Does the 2.2 inch 320x240 TFT (ILI9340) support MISO mode?

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paulstoffregen
 
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Does the 2.2 inch 320x240 TFT (ILI9340) support MISO mode?

Post by paulstoffregen »

I have a quick technical question regarding Adafruit's 2.2 inch 320x240 TFT display with the ILI9340 controller.

Is the SDO signal from the LCD's pin 7 (documented on page 5 of this datasheet) routed to the MISO pin on the edge of Adafruit's PCB? Or is MISO connected only to the SD card, as on the other TFT LCDs Adafruit sells?

I read through the Adafruit_ILI9340 library code. It never issues any of the commands which would use the SDO pin.

I am curious to try writing an Arduino library that supports alpha blending and transparency. Since no Arduino has 154K of free RAM, the only way to achieve this would require using that signal to implement read-modify-write operations.

Please, if anyone from Adafruit has access to the schematic, would it be possible to post it or at least check if the LCD's SDO signal connects through to the MISO pin?

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adafruit_support_rick
 
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Re: Does the 2.2 inch 320x240 TFT (ILI9340) support MISO mod

Post by adafruit_support_rick »

According to the schematic, MISO connects to both the SD and the LCD

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paulstoffregen
 
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Re: Does the 2.2 inch 320x240 TFT (ILI9340) support MISO mod

Post by paulstoffregen »

Thank Rick, for checking the schematic for me.

I ordered one of these displays today. When/if I ever get alpha-blending working, I'll demo it first on this Adafruit display!

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adafruit_support_rick
 
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Re: Does the 2.2 inch 320x240 TFT (ILI9340) support MISO mod

Post by adafruit_support_rick »

cool!

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