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adafruit / Adafruit-ST7735-Library

This is a library for the Adafruit 1.8" SPI display http://www.adafruit.com/products/358 and http://www.adafruit.com/products/618
https://learn.adafruit.com/1-8-tft-display
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ST7789 with 240X240 drive failure, but 240*135 succeed? #123

Closed KiraVerSace closed 4 years ago

KiraVerSace commented 4 years ago

Hi, As I said, when I use the Adafruit ST7789 Library drive my TFT, I have several TFTs. When I drive the 240x135 it succeed, but I change to the 240X240 and it is failed, So I try another Library in the git https://github.com/ananevilya/Arduino-ST7789-Library it succeed, I don't know why and the differences between them?

And I find a very interesting question, When I use your library I must connect the CS pin to the IO, and control by your Library, even I connect it to the GND, the TFT never display. And my 240X240 TFT's CS pin was connected to the GND in the PCB, So I can not control the CS pin, May be it's the reason that cause it? May the problem is not your library but the CS pin can not connect to the GND directly?

Could you help me, Thankyou very much.

ladyada commented 4 years ago

we dont support breakouts without CS - please use that library instead!

KiraVerSace commented 4 years ago

we dont support breakouts without CS - please use that library instead!

Thank you for your help! And I want to know why, because the CS pin connect to GND means the chip is selected, in general,SPI with one device, we could not control the CS pin.

Can you give me the reason?

ladyada commented 4 years ago

it is incompatible. you cannot support both. we support CS pin only. use other library please