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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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Difficulty with Wemos D1 Mini TFT Touch Shield - Works with Adafruit_Gfx #413

Closed jpasqua closed 5 years ago

jpasqua commented 5 years ago

I'm confident that this is my error, but I'm having difficulty finding it. I have a Wemos D1 Mini mounted on a 2.4" Touch Shield: https://wiki.wemos.cc/products:d1_mini_shields:tft_2.4_shield

The display and touch controller work well (though slowly) with Adafruit_GFX and the ILI9341 driver. I have been unable to get anything but a white screen when using it with TFT_eSPI. I've tried several of the supplied examples. I have used the TFT_eSPI library successfully with a D1 Mini connected to a 2.8" TFT, but not via the shield.

Here is the setup file I am using and the settings correspond to those I'm using with my successful Adafruit_GFX test:

// See SetupX_Template.h for all options available

#define ILI9341_DRIVER

#define TFT_CS D0  //for D1 mini or TFT I2C Connector Shield (V1.1.0 or later)
#define TFT_DC D8  //for D1 mini or TFT I2C Connector Shield (V1.1.0 or later)
#define TFT_RST -1 //for D1 mini or TFT I2C Connector Shield (V1.1.0 or later)
#define TS_CS D3   //for D1 mini or TFT I2C Connector Shield (V1.1.0 or later)

#define LOAD_GLCD   // Font 1. Original Adafruit 8 pixel font needs ~1820 bytes in FLASH
#define LOAD_FONT2  // Font 2. Small 16 pixel high font, needs ~3534 bytes in FLASH, 96 characters
#define LOAD_FONT4  // Font 4. Medium 26 pixel high font, needs ~5848 bytes in FLASH, 96 characters
#define LOAD_FONT6  // Font 6. Large 48 pixel font, needs ~2666 bytes in FLASH, only characters 1234567890:-.apm
#define LOAD_FONT7  // Font 7. 7 segment 48 pixel font, needs ~2438 bytes in FLASH, only characters 1234567890:.
#define LOAD_FONT8  // Font 8. Large 75 pixel font needs ~3256 bytes in FLASH, only characters 1234567890:-.
#define LOAD_GFXFF  // FreeFonts. Include access to the 48 Adafruit_GFX free fonts FF1 to FF48 and custom fonts

#define SMOOTH_FONT

//#define SPI_FREQUENCY       27000000
#define SPI_FREQUENCY       40000000
#define SPI_READ_FREQUENCY  20000000
#define SPI_TOUCH_FREQUENCY  2500000

//#define SUPPORT_TRANSACTIONS

I've tried this with and without SUPPORT_TRANSACTIONS and with variations of the SPI_FREQUENCY. I am reading the settings back using Read_User_Setup and the values look good:

TFT_eSPI ver = 1.4.16
Processor    = ESP8266
Frequency    = 80 MHz
Voltage      = 3.33 V
Transactions = No 
Interface    = SPI 
SPI overlap  = No 

Display driver = 9341
Display width  = 240 
Display height = 320 

TFT_CS   = D0 (GPIO 16)
TFT_DC   = D8 (GPIO 15)
Font GLCD   loaded
Font 2      loaded
Font 4      loaded
Font 6      loaded
Font 7      loaded
Font 8      loaded
Smooth font enabled

Display SPI frequency = 40.0 MHz

In summary:

jpasqua commented 5 years ago

Ugh. Sorry to have bothered everyone. My setup file used D0, D8, D3 instead of PIN_D0, PIN_D8, PIN_D3. This is an important distinction since the former are variable definitions and the latter are #define's. This screws up the way they are interpreted by TFT_eSPI.h.

I hope my error saves someone else some time.

Bodmer commented 5 years ago

Unfortunately the Arduino Dx designations do not always work for some reason and can map the signals to the wrong pins. Hence the need to use PIN_Dx, as noted in the setup file.