Changing pins on a mcufriend TFT screen

[ON7EN]

hi

i want to connect a esp32 to my mcufriend screen.
when i use the standard connections screen is working
but i need to change pinorder to fit my pcb
is it possible to change the pins ?

i tried to change the pins like this

#define LCD_CS 16 // Chip select control pin
#define LCD_DC 4 // Data Command control pin - must use a pin in the range 0-31
#define LCD_RST 17 // Reset pin
#define LCD_WR 2 // Write strobe control pin - must use a pin in the range 0-31
#define LCD_RD 15
#define LCD_D0 12
#define LCD_D1 13
#define LCD_D2 32
#define LCD_D3 33
#define LCD_D4 25
#define LCD_D5 26
#define LCD_D6 27
#define LCD_D7 14

but that was not working

any suggestion?

thanks jean-marie

[david_prentice]

Look at mcufriend_shield.h
You will see the "shield" wiring.

Alter the defines to match your wiring in the LCD_ID_readreg example sketch.

Then run LCD_ID_readreg example. If it returns correct values, the defines should work in mcufriend_shield.h (but you should really put them in mcufriend_special.h)

David.

[ON7EN]

david thanks for reaction

i changed this:
//################################### ESP32 ##############################
#elif defined(ESP32) //regular UNO shield on TTGO D1 R32 (ESP32)
#define LCD_RD 21//2 //LED
#define LCD_WR 3//4
#define LCD_RS 1//15 //hard-wired to A2 (GPIO35)
#define LCD_CS 22//33 //hard-wired to A3 (GPIO34)
#define LCD_RST 23//32 //hard-wired to A4 (GPIO36)

#define LCD_D0 12
#define LCD_D1 13
#define LCD_D2 32//26
#define LCD_D3 33//25
#define LCD_D4 25//17
#define LCD_D5 26//16
#define LCD_D6 27
#define LCD_D7 14

but i get this error:
esptool.py v2.6
Serial port COM12
Connecting......
Chip is ESP32D0WDQ5 (revision 1)

A fatal error occurred: Timed out waiting for packet header
i use this:
#include <MCUFRIEND_kbv.h>
MCUFRIEND_kbv tft;

do i need to change something ?

thanks jean-marie

[david_prentice]

Alter the defines to match your wiring in the LCD_ID_readreg example sketch.

Then run LCD_ID_readreg example.

It should give you meaningful report.
e.g. reg(0xD3) will show the ID on most controllers.

When you get a sensible report, paste it to your message.

David.

[ON7EN]

david

i changed the pins in mcufriend shield and in the lcd id readreg ino.
i have this error:

esptool.py v2.6
Serial port COM12
Connecting...........................

A fatal error occurred: Timed out waiting for packet header
A fatal error occurred: Timed out waiting for packet header
when i only hit the verifiy button compiling is ok

my esp is an NODEMCU-32 V1.2 module.in the IDE i choose ESP32 DEV module as bord

jean-marie

[david_prentice]

I edited LCD_ID_readrg.ino e.g.

...
#if defined(ESP32)       //regular UNO shield on TTGO D1 R32 (ESP32)
#define LCD_RD  2  //LED
#define LCD_WR  4
#define LCD_RS 15  //hard-wired to A2 (GPIO35) 
#define LCD_CS 33  //hard-wired to A3 (GPIO34)
#define LCD_RST 32 //hard-wired to A4 (GPIO36)

#define LCD_D0 12
#define LCD_D1 13
#define LCD_D2 26
#define LCD_D3 25
#define LCD_D4 17
#define LCD_D5 16
#define LCD_D6 27
#define LCD_D7 14
#else
//-- Arduino UNO or Mega 2560 Plugged as shield
#define LCD_RST A4
#define LCD_CS A3
#define LCD_RS A2
#define LCD_WR A1
#define LCD_RD A0

#define LCD_D0 8
#define LCD_D1 9
#define LCD_D2 2
#define LCD_D3 3
#define LCD_D4 4
#define LCD_D5 5
#define LCD_D6 6
#define LCD_D7 7
#endif

void setup()
{
    ...

and ran on a ST7781 Shield

reg(0x0000) 77 83 ID: ILI9320, ILI9325, ILI9335, ...

If I trawl through the Compile line you will see that I used v1.8.13 IDE (-DARDUINO=10813) Board = ESP32 DEV (-DARDUINO_ESP32_DEV) and the Core is v1.0.4 ( "-IC:\Users\David Prentice\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.4\variants\esp32")

I suggest that you always try ready-made examples first.

Note that the readreg sketch uses no libraries at all. Just virgin digitalRead() and digitalWrite()

David.