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Bodmer / TFT_eSPI

Arduino and PlatformIO IDE compatible TFT library optimised for the Raspberry Pi Pico (RP2040), STM32, ESP8266 and ESP32 that supports different driver chips
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ILI9341 (MRB3205) set to parallel 8bit - ESP32 image problem #784

Closed KamaJogi closed 3 years ago

KamaJogi commented 3 years ago

Hi,

Arduino, libraries and ESP32 are up to date. My ESP32 version -> https://components101.com/microcontrollers/esp32-devkitc I use setup file -> Setup14_ILI9341_Parallel.h LCD pins are soldered to the ESP32 on the board. LCD VDD directly connected to 5V. I had to set the ESP CPU Frequency to 40 MHz. Higher CPU frequency = white screen on LCD.

IMG_20201011_130216

Bodmer commented 3 years ago

This is likely caused by one or more of the following:

  1. Inadequate power supply to the ESP32 and TFT (not enough current)
  2. Inadequate ground (0V or GND) connections between ESP32 and display (too long), add extra connections to avoid "ground bounce"
  3. Wires from ESP32 to the TFT are too long causing "ringing" on signals
  4. Unstable logic level on RD pin
KamaJogi commented 3 years ago
  1. Power 3.3V supply 3A (Oscilloscope test - ok)
  2. Inadequate ground (0V or GND) (Oscilloscope test - ok)
  3. Wires from ESP32 -> long, short or soldered - no diffrence,
  4. Stable logic level on RD pin (Oscilloscope test - ok).

I changed the pin assignments - the same symptoms :(

Maybe there is something wrong with ESP32 - but SPI displays works OK.

Maybe the logic state changes too fast for LCD - pins are directly connected to LCD BUS without HC245 -> How do I slow down the change of logic states in your code?

2 4Inch-TFT-LCD-Touch-Panel-Shield3

KamaJogi commented 3 years ago

ESP32 - DevKitC was caused problem.

I found MH-ET LIVE D1 mini ESP32 - connect to LCD and everything works fine.

Thanks for help.