search

sumotoy / TFT_ST7735

A fast driver for ST7735 displays that works with Arduino's /All Teensy's/ESP8266/SPARK
69 stars 31 forks source link

Hardware SPI Pins on ESP8266? #19

Open arturgoms opened 7 years ago

arturgoms commented 7 years ago

It's possible to use the hardware pins to control this lcd?? gytj6

I mean this up pins, where is GPIO 9 and 10. And not the sofwarepins in GPIO 14 and 13

Thank You.

RichyT commented 6 years ago

I think some of those pins are reserved for the flash memory.

Note that some boards and modules (ESP-12ED, NodeMCU 1.0) also break out pins 9 and 11. These may be used as IO if flash chip works in DIO mode (as opposed to QIO, which is the default one).

http://esp8266.github.io/Arduino/versions/2.0.0/doc/reference.html

I don't know if this helps much. I'd imagine this library isn't equipped to do it.

tbdltee commented 5 years ago

I have try ESP-12F with Ardafruit GFX and it's working. But you need to connect to the correct pins. It won't work if you connect to the wrong pin. Here is my setup.

define TFT_CS 0 // GPIO0 --> if you use SPI on GPIO 9, 10. CS always GPIO0

define TFT_RST 4 // GPIO4

define TFT_DC 2 // GPIO2

define TFT_LED 15 // GPIO15

for RST and DC, you can try other pins but it works for me on this 2 pins. I think it's because of pull-up/pull-down stage at boot. Because CS always GPIO0, you must handle with care. ESP may boot into flash mode. I connect it without pull-down. You can see that I try to resue all ESP configuration pins. If you connected to normal GPIO pin, it works for sure. In the sketch, you must call SPI.pins(6, 7, 8, 0); before init the TFT. and you must compile and upload in DIO mode.

Then, I switch to TFT_ST7735 library without any changes or tweak but it's not working. To be able to use, I need to investigate more on proper software setup. I also doubt that can we use this SPI pin? because it's connect to the internal NAND flash and this lib is using high-speed spi. Anyway, it does not mean "NO". I'm just not try yet. Need more experiment with this good library.

I'm use this library with arduino and very happy and now try to use it with esp8266.

that was my experiment so far. br/tee