ESP8266 with ST7796S 4.0inch TFT SPI

[izumo]

Hello,

I want to use 4.0inch TFT SPI display with Wemos D1 (ESP8266)
I download TFT_eSPI library.
When i upload graphic example with choosen ILI9341 display works with 2/3 of screen (1/3 screen is white)
With setup ST7796 i have just white screen,

graphictest.ino

#define TFT_DC D3
#define TFT_CS D8

User_Setup.h

#define ST7796_DRIVER

User_Setup_Select.h

#include <User_Setups/Setup28_RPi_ST7796_ESP8266.h>

Setup36_RPi_touch_ST7796.h

//#define RPI_DISPLAY_TYPE
#define ST7796_DRIVER // 20MHz maximum SPI

#define TFT_MISO D6
#define TFT_MOSI D7
#define TFT_SCLK D5
#define TFT_CS D8 // Chip select control pin
#define TFT_DC D3 // Data Command control pin
#define TFT_RST D4 // Reset pin (could connect to RST pin)

#define SPI_FREQUENCY 27000000

I also test display with Adafruit ILI9341 and display works with 2/3 of screen (1/3 screen is white)

Any sugestions ?

[david_prentice]

Go on. Post a link to the actual screen that you bought. Post a link to the actual ESP8266 board that you bought.

I always advise connecting TFT_RST pin. In other words, follow the wiring in the User_Setup.

David.

[izumo]

I change i user_setup

//#define TFT_RST PIN_D4 // Reset pin (could connect to NodeMCU RST, see next line)
#define TFT_RST -1 // Set TFT_RST to -1 if the display RESET is connected to NodeMCU RST or 3.3V

I change connection from wemos pinD4 to reset with no result

[david_prentice]

You have a Red SPI display. There is no Touch Controller.

I strongly advise you to start with User_Setups/Setup28_RPi_ST7796_ESP8266.h comment the #define RPI_DISPLAY_TYPE and save as your custom Setup with a descriptive name e.g. SetupNN_ST7796_ESP8266.h

Wire screen to the ESP8266 D1 board according to the defines.

Select "Wemos D1 R1" board in the IDE.

David.

[izumo]

I almost give up. Still not working, maybe i messed up with this config files…

Setup28_RPi_ST7796_ESP8266.h (4.71 KB)

User_Setup.h (15.1 KB)

User_Setup_Select.h (10.3 KB)

[david_prentice]

User_Setup_Select.h

// Only ONE line below should be uncommented.  Add extra lines and files as needed.

//#include <User_Setup.h>           // Default setup is root library folder
...
#include <User_Setups/Setup28_RPi_ST7796_ESP8266.h>  // ESP8266 RPi MHS-4.0 inch Display-B
...

Bodmer provides lots of ready-made Setups. You must follow his instructions. e.g. Only ONE line below should be uncommented.

David.

[izumo]

I reinstall library.

User_Setup_Select.h

//#include <User_Setup.h>
#include <User_Setups/Setup28_RPi_ST7796_ESP8266.h>

Setup28_RPi_ST7796_ESP8266.h

//#define RPI_DISPLAY_TYPE
#define TFT_CS PIN_D2 // Chip select control pin D2
#define TFT_DC PIN_D3 // Data Command control pin
//#define TFT_RST PIN_D4 // Reset pin (could connect to NodeMCU RST, see next line)
#define TFT_RST -1 // Set TFT_RST to -1 if the display RESET is connected to NodeMCU RST or 3.3V
//#define TOUCH_CS PIN_D1 // Chip select pin (T_CS) of touch screen
#define SPI_FREQUENCY 27000000
#define SUPPORT_TRANSACTIONS

Connection:

WemosD1 TFT
D2 → CS
D3/SCL/D15 → DC/RS
D5/SCK/D13 → SCK
D6/MISO/D12 → SDO(MISO)
D7/MOSI/D11 -->SDI(MOSI)
RESET → RESET

Still white screen

TFT_eSPI ver = 2.3.4
Processor    = ESP8266
Frequency    = 80MHz
Voltage      = 3.22V
Transactions = Yes
Interface    = SPI
SPI overlap  = No

Display driver = 7796
Display width  = 320
Display height = 480

TFT_CS   = PIN_D2
TFT_DC   = PIN_D3

Font GLCD   loaded
Font 2      loaded
Font 4      loaded
Font 6      loaded
Font 7      loaded
Font 8      loaded
Smooth font enabled

Display SPI frequency = 27.00

[david_prentice]

If you follow my advice, I will continue.

If you don't, I will give up. I waste too much time replying to posters that choose to ignore advice.

David.

[izumo]

User_Setup_Select.h

//#include <User_Setup.h>
#include <User_Setups/SetupNN_ST7796_ESP8266.h>

SetupNN_ST7796_ESP8266.h
//#define RPI_DISPLAY_TYPE
#define TFT_CS PIN_D2 // Chip select control pin D2
#define TFT_DC PIN_D3 // Data Command control pin
#define TFT_RST PIN_D4 // Reset pin (could connect to NodeMCU RST, see next line)
//#define TFT_RST -1 // Set TFT_RST to -1 if the display RESET is connected to NodeMCU RST or 3.3V
//#define TOUCH_CS PIN_D1 // Chip select pin (T_CS) of touch screen
#define SPI_FREQUENCY 27000000
#define SUPPORT_TRANSACTIONS

WemosD1 TFT
D2 → CS
D3/SCL/D15 → DC/RS
D4/SDA/14 → RESET
D5/SCK/D13 → SCK
D6/MISO/D12 → SDO(MISO)
D7/MOSI/D11 -->SDI(MOSI)

[david_prentice]

I would expect everything to work now.

I have a D1 R1 board and a Red SPI with ST7796. I select "Wemos R1 D1" board in IDE.

Ok, I use different wiring (because my Adapter works on other Arduino boards):

#define TFT_MOSI D11
#define TFT_MISO D12
#define TFT_SCK  D13
#define TFT_CS   D10  // Chip select control pin D8
#define TFT_DC   D9  // Data Command control pin
#define TFT_RST  D8  // Reset pin (could connect to NodeMCU RST, see next line)
#define TOUCH_CS D3  // Chip select pin (T_CS) of touch screen

But your wiring should work 100% too.

David.

[izumo]

I have selected Wemos R1 D1

i have also shield made by my own very long time ago and some chinese stand for esp
i’ll try to run it on them

[izumo]

Now its working, it must be something with Wemos.

THX for help.

[izumo]

There are different adress of pins in wemos
After change pins TFT works on wemos too