Anybody know how to set this display up to run 2 wire on the XIAO ESP32
The example code is for an old arduino using Ports and throws compile errors
The other libraries for tft ST7789 use the more wire setup, also i am using XIAO Grove Expansion Board so i need to use pin sets that are on that board connector
just black screen
Can anyone help me with this?
Hi there,
I’m pretty sure it’s not I2C , but SPI with not MISO(9) SCL would be (8)SCLK and MOSI(10) for SDA
ie. no Address associated with it being I2C but try a scanner run first to verify it’s not an I2C obscured address device. Also note with any spi device the init needs to Assert the pins prior to the SPI.begin();
HTH
GL 
PJ 
If it’s the RGB-OLED ST7789 ver. 1.0
I have one around this pile somewhere If I’m able to locate it I’ll try it out and post.
Yes… V1.0… no IIC
I think you are right, that is about as far as my troubleshooting has got me
The problem being that XIAO Expansion boards do not expose 8 and 10 together in a port
So i need a software solution
Can i define any pin, i think that was what the original “Fast” lib was trying to do was bit bang the output… I am sure it is something simple i dont know YET… lol I tried many different libs and have not gotten it to work, and i think a large part of the problem is the grove connector,… no one else is writing libs or tutorials to service this ecosystem
I am wondering if their is a 2 wire constructor that i do not know
Remember I posed the question of Grove SPI on the Discord… but did not get any engagement!
Maybe Citric would know… but I try not to monopolize
I dont like being Helplessly Hopeless … or Hoplessly Helpless…
Hi there,
So I found an old UNO I had. Hooked it up ,copy & pasted code ,compiled and worked without edit.
#include <Adafruit_GFX.h>
#include <Arduino_ST7789_Fast.h>
#define SCK 7
#define SDA 8
Arduino_ST7789 lcd = Arduino_ST7789(SCK, SDA);
void setup(void)
{
lcd.init();
lcd.fillScreen(BLACK);
lcd.setCursor(0, 0);
lcd.setTextColor(RED,BLACK);
lcd.setTextSize(3);
lcd.println("HELLO WORLD");
}
void loop()
{
}
compiler output…
FQBN: arduino:avr:uno
Using board 'uno' from platform in folder: C:\Users\Dude\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.6
Using core 'arduino' from platform in folder: C:\Users\Dude\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.6
Detecting libraries used...
Using library Adafruit GFX Library at version 1.11.9 in folder: D:\Arduino_projects\libraries\Adafruit_GFX_Library
Using library Adafruit BusIO at version 1.16.1 in folder: D:\Arduino_projects\libraries\Adafruit_BusIO
Using library Wire at version 1.0 in folder: C:\Users\Dude\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.6\libraries\Wire
Using library SPI at version 1.0 in folder: C:\Users\Dude\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.6\libraries\SPI
Using library Fast ST7789 Library at version 1.0.4 in folder: D:\Arduino_projects\libraries\Fast_ST7789_Library
"C:\\Users\\Dude\\AppData\\Local\\Arduino15\\packages\\arduino\\tools\\avr-gcc\\7.3.0-atmel3.6.1-arduino7/bin/avr-size" -A "C:\\Users\\Dude\\AppData\\Local\\Temp\\arduino\\sketches\\39D9A1C7B5D071B7F4BC89D551846045/sketch_jun23c.ino.elf"
Sketch uses 7514 bytes (23%) of program storage space. Maximum is 32256 bytes.
Global variables use 258 bytes (12%) of dynamic memory, leaving 1790 bytes for local variables. Maximum is 2048 bytes.
"C:\Users\Dude\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino17/bin/avrdude" "-CC:\Users\Dude\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino17/etc/avrdude.conf" -v -V -patmega328p -carduino "-PCOM16" -b115200 -D "-Uflash:w:C:\Users\Dude\AppData\Local\Temp\arduino\sketches\39D9A1C7B5D071B7F4BC89D551846045/sketch_jun23c.ino.hex:i"
avrdude: Version 6.3-20190619
Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
Copyright (c) 2007-2014 Joerg Wunsch
System wide configuration file is "C:\Users\Dude\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino17/etc/avrdude.conf"
Using Port : COM16
Using Programmer : arduino
Overriding Baud Rate : 115200
AVR Part : ATmega328P
Chip Erase delay : 9000 us
PAGEL : PD7
BS2 : PC2
RESET disposition : dedicated
RETRY pulse : SCK
serial program mode : yes
parallel program mode : yes
Timeout : 200
StabDelay : 100
CmdexeDelay : 25
SyncLoops : 32
ByteDelay : 0
PollIndex : 3
PollValue : 0x53
Memory Detail :
Block Poll Page Polled
Memory Type Mode Delay Size Indx Paged Size Size #Pages MinW MaxW ReadBack
----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
eeprom 65 20 4 0 no 1024 4 0 3600 3600 0xff 0xff
flash 65 6 128 0 yes 32768 128 256 4500 4500 0xff 0xff
lfuse 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00
hfuse 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00
efuse 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00
lock 0 0 0 0 no 1 0 0 4500 4500 0x00 0x00
calibration 0 0 0 0 no 1 0 0 0 0 0x00 0x00
signature 0 0 0 0 no 3 0 0 0 0 0x00 0x00
Programmer Type : Arduino
Description : Arduino
Hardware Version: 3
Firmware Version: 4.4
Vtarget : 0.3 V
Varef : 0.3 V
Oscillator : 28.800 kHz
SCK period : 3.3 us
avrdude: AVR device initialized and ready to accept instructions
Reading | ################################################## | 100% 0.00s
avrdude: Device signature = 0x1e950f (probably m328p)
avrdude: reading input file "C:\Users\Dude\AppData\Local\Temp\arduino\sketches\39D9A1C7B5D071B7F4BC89D551846045/sketch_jun23c.ino.hex"
avrdude: writing flash (7514 bytes):
Writing | ################################################## | 100% 1.21s
avrdude: 7514 bytes of flash written
avrdude done. Thank you.
Looks good, BRIGHT!! I’ll try the Nrf52840 and ESP32’s as time permits. Long and short of it is it’s not I2C and probably needs SPI to run on the others.
HTH
GL PJ
time for refreshment
Thanks boss… I also have been working… I pulled out my male and female dupont connector to Grove connectors and hardwired
Also working on a source code that had a bunch of unnecessary extras and trying to clean it up … right now the code is blocking my serial montor… as soon as the code uploads the USB link goes down… i think the code is manipulating the pins the USB is on…
Hi there,
-1 for the reset , makes it use the arduino’s or mcu’s , You must define a CS even if you don’t use one the LIB requires it. also you have to Set and reset the SCL and SDA pins prior to the Begin();(that’s what the FAST lib is doing also.
on the uno it only worked on the PINS allowed to be spi pins, the i2c pins were a no go as well.
HTH
GL PJ
/***************************************************
This is a library for the ST7789 IPS SPI display.
****************************************************/
#include <Adafruit_GFX.h> // Core graphics library by Adafruit
#include <Arduino_ST7789.h> // Hardware-specific library for ST7789 (with or without CS pin)
#include <SPI.h>
#define TFT_DC -1
#define TFT_RST -1
#define TFT_MOSI 10 // for hardware SPI data pin (all of available pins)
#define TFT_SCLK 8 // for hardware SPI sclk pin (all of available pins)
Arduino_ST7789 tft = Arduino_ST7789(TFT_DC, TFT_RST, TFT_MOSI, TFT_SCLK); //for display without CS pin
//Arduino_ST7789 tft = Arduino_ST7789(TFT_DC, TFT_RST, TFT_MOSI, TFT_SCLK, TFT_CS); //for display with CS pin
float p = 3.1415926;
void setup(void)
{//Begin Main Setup
Serial.begin(19200);
Serial.println("Hello! ST7789 TFT Test");
tft.init(240, 240); // initialize a ST7789 chip, 240x240 pixels
}// End Main Setup
void testlines(uint16_t color)
{//Begin testlines
tft.fillScreen(BLACK);
for (int16_t x=0; x < tft.width(); x+=6)
{//Begin for
tft.drawLine(0, 0, x, tft.height()-1, color);
}// End for
for (int16_t y=0; y < tft.height(); y+=6)
{//Begin for
tft.drawLine(0, 0, tft.width()-1, y, color);
}// End for
tft.fillScreen(BLACK);
for (int16_t x=0; x < tft.width(); x+=6)
{//Begin for
tft.drawLine(tft.width()-1, 0, x, tft.height()-1, color);
}// End for
for (int16_t y=0; y < tft.height(); y+=6)
{//Begin for
tft.drawLine(tft.width()-1, 0, 0, y, color);
}// End for
tft.fillScreen(BLACK);
for (int16_t x=0; x < tft.width(); x+=6)
{//Begin for
tft.drawLine(0, tft.height()-1, x, 0, color);
}// End for
for (int16_t y=0; y < tft.height(); y+=6)
{//Begin for
tft.drawLine(0, tft.height()-1, tft.width()-1, y, color);
}// End for
tft.fillScreen(BLACK);
for (int16_t x=0; x < tft.width(); x+=6)
{//Begin for
tft.drawLine(tft.width()-1, tft.height()-1, x, 0, color);
}// End for
for (int16_t y=0; y < tft.height(); y+=6)
{//Begin for
tft.drawLine(tft.width()-1, tft.height()-1, 0, y, color);
}// End for
}// End testlines
void testdrawtext(char *text, uint16_t color)
{//Begin testdrawtext
tft.setCursor(0, 0);
tft.setTextColor(color);
tft.setTextWrap(true);
tft.print(text);
}// End testdrawtext
void testfastlines(uint16_t color1, uint16_t color2)
{//Begin testfastlines
tft.fillScreen(BLACK);
for (int16_t y=0; y < tft.height(); y+=5)
{//Begin for
tft.drawFastHLine(0, y, tft.width(), color1);
}// End for
for (int16_t x=0; x < tft.width(); x+=5)
{//Begin for
tft.drawFastVLine(x, 0, tft.height(), color2);
}// End for
}// End testfastlines
void testdrawrects(uint16_t color)
{//Begin testdrawrects
tft.fillScreen(BLACK);
for (int16_t x=0; x < tft.width(); x+=6)
{//Begin for
tft.drawRect(tft.width()/2 -x/2, tft.height()/2 -x/2 , x, x, color);
}// End for
}// End testdrawrects
void testfillrects(uint16_t color1, uint16_t color2)
{//Begin testfillrects
tft.fillScreen(BLACK);
for (int16_t x=tft.width()-1; x > 6; x-=6)
{//Begin for
tft.fillRect(tft.width()/2 -x/2, tft.height()/2 -x/2 , x, x, color1);
tft.drawRect(tft.width()/2 -x/2, tft.height()/2 -x/2 , x, x, color2);
}// End for
}// End testfillrects
void testfillcircles(uint8_t radius, uint16_t color)
{//Begin testfillcircles
for (int16_t x=radius; x < tft.width(); x+=radius*2)
{//Begin for-1
for (int16_t y=radius; y < tft.height(); y+=radius*2)
{//Begin for-2
tft.fillCircle(x, y, radius, color);
}// End for-2
}// End for-1
}// End testfillcircles
void testdrawcircles(uint8_t radius, uint16_t color)
{//Begin testdrawcircles
for (int16_t x=0; x < tft.width()+radius; x+=radius*2)
{//Begin for-1
for (int16_t y=0; y < tft.height()+radius; y+=radius*2)
{//Begin for-2
tft.drawCircle(x, y, radius, color);
}// End for-2
}// End for-1
}// End testdrawcircles
void testtriangles()
{//Begin testtriangles
tft.fillScreen(BLACK);
int color = 0xF800;
int t;
int w = tft.width()/2;
int x = tft.height()-1;
int y = 0;
int z = tft.width();
for(t = 0 ; t <= 15; t++)
{//Begin for
tft.drawTriangle(w, y, y, x, z, x, color);
x-=4;
y+=4;
z-=4;
color+=100;
}// End for
}// End testtriangles
void testroundrects()
{//Begin testroundrects
tft.fillScreen(BLACK);
int color = 100;
int i;
int t;
for(t = 0 ; t <= 4; t+=1)
{//Begin for-1
int x = 0;
int y = 0;
int w = tft.width()-2;
int h = tft.height()-2;
for(i = 0 ; i <= 16; i+=1)
{//Begin for-2
tft.drawRoundRect(x, y, w, h, 5, color);
x+=2;
y+=3;
w-=4;
h-=6;
color+=1100;
}// End for-2
color+=100;
}// End for-1
}// End testroundrects
void tftPrintTest()
{//Begin tftPrintTest
tft.setTextWrap(false);
tft.fillScreen(BLACK);
tft.setCursor(0, 30);
tft.setTextColor(RED);
tft.setTextSize(1);
tft.println("Hello DSTIKE");
tft.setTextColor(YELLOW);
tft.setTextSize(2);
tft.println("Hello DSTIKE");
tft.setTextColor(GREEN);
tft.setTextSize(3);
tft.println("Hello DSTIKE");
tft.setTextColor(BLUE);
tft.setTextSize(4);
tft.print(1234.567);
delay(1500);
tft.setCursor(0, 0);
tft.fillScreen(BLACK);
tft.setTextColor(WHITE);
tft.setTextSize(0);
tft.println("DSTIKE!");
tft.setTextSize(1);
tft.setTextColor(GREEN);
tft.print(p, 6);
tft.println(" Want pi?");
tft.println(" ");
tft.print(8675309, HEX); // print 8,675,309 out in HEX!
tft.println(" Print HEX!");
tft.println(" ");
tft.setTextColor(WHITE);
tft.println("Sketch has been");
tft.println("running for: ");
tft.setTextColor(MAGENTA);
tft.print(millis() / 1000);
tft.setTextColor(WHITE);
tft.print(" seconds.");
}// End tftPrintTest
void mediabuttons()
{//Begin mediabuttons
// play
tft.fillScreen(BLACK);
tft.fillRoundRect(25, 10, 78, 60, 8, WHITE);
tft.fillTriangle(42, 20, 42, 60, 90, 40, RED);
delay(500);
// pause
tft.fillRoundRect(25, 90, 78, 60, 8, WHITE);
tft.fillRoundRect(39, 98, 20, 45, 5, GREEN);
tft.fillRoundRect(69, 98, 20, 45, 5, GREEN);
delay(500);
// play color
tft.fillTriangle(42, 20, 42, 60, 90, 40, BLUE);
delay(50);
// pause color
tft.fillRoundRect(39, 98, 20, 45, 5, RED);
tft.fillRoundRect(69, 98, 20, 45, 5, RED);
// play color
tft.fillTriangle(42, 20, 42, 60, 90, 40, GREEN);
tft.setCursor(60, 200);
tft.setTextColor(RED);
tft.setTextSize(4);
tft.println("DSTIKE");
}// End mediabuttons
void tftLoop(void)
{//Begin tftLoop
Serial.println("Begin TFT Loop");
uint16_t time = millis();
tft.fillScreen(BLACK);
time = millis() - time;
Serial.println(time, DEC);
delay(500);
// large block of text
tft.fillScreen(BLACK);
testdrawtext("Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur adipiscing ante sed nibh tincidunt feugiat. Maecenas enim massa, fringilla sed malesuada et, malesuada sit amet turpis. Sed porttitor neque ut ante pretium vitae malesuada nunc bibendum. Nullam aliquet ultrices massa eu hendrerit. Ut sed nisi lorem. In vestibulum purus a tortor imperdiet posuere. ", WHITE);
delay(1000);
// tft print function
tftPrintTest();
delay(2000);
// a single pixel
tft.drawPixel(tft.width()/2, tft.height()/2, GREEN);
delay(500);
// line draw test
testlines(YELLOW);
delay(500);
// optimized lines
testfastlines(RED, BLUE);
delay(500);
testdrawrects(GREEN);
delay(500);
testfillrects(YELLOW, MAGENTA);
delay(500);
tft.fillScreen(BLACK);
testfillcircles(10, BLUE);
testdrawcircles(10, WHITE);
delay(500);
testroundrects();
delay(500);
testtriangles();
delay(500);
mediabuttons();
delay(500);
tft.invertDisplay(true);
delay(500);
tft.invertDisplay(false);
delay(500);
Serial.println("done");
delay(500);
}// End tftLoop
void loop()
{//Begin Main Loop Function
tftLoop(); //tft Demo Loop
}// End Main Loop Function
I got this working on XIAO ESP32C3… i get the serial monitor feedback… but screen is backlight on but screen black
So you didn’t get it going then?, look at using the older LIBs, check the compiler output.
all the examples appear to work properly.
Pins need to be the right ones too. 
GL PJ
Thanks PJGatto for reminding me sometimes you just have to go back to basics
I dug out my old Atruino Uno… what da?
Im now trying to use tft_espi same as round display to work on esp devices… still working on user config file
Hi there,
Yea , I dabbled a bit with TFT_eSPI.lib, but you still need to do some SPI transaction code in front of it to get it to work, FYI. Also RUN the “Read_User_Setup.ino” (in examples, under diags) code after you edit your config.h to see the settings.
I have found they must be SPot on and agree with the PINOUTs to work.
HTH
GL PJ
output like this.
[code]
TFT_eSPI ver = 2.4.2
Processor = Generic
Transactions = Yes
Interface = SPI
Display driver = 7789
Display width = 240
Display height = 320
MOSI = GPIO -1
MISO = GPIO -1
SCK = GPIO -1
TFT_CS = GPIO -1
TFT_DC = GPIO -1
TFT_RST = GPIO -1
Font GLCD loaded
Font 2 loaded
Font 4 loaded
Font 6 loaded
Font 7 loaded
Font 8 loaded
Smooth font enabled
Display SPI frequency = 10.00
[/code]
Go watch this Video , to help you make sense of it all.
do you know how to declare the user setup in the code and not the lib? I am thinking an include… but which one do you remove? i know the lib has some error checking to keep you from double defining…
It’s in the first few lines of the TFT_eSPI.h thats loaded by the include of the main LIB. LiB say’s
#include user setups selects.h" kinda thing.
GL PJ
also when you are done with edits. copy "USER_SETUP.h " to the root LIBRARY folder for it to take.
Im gonna just put it in with all the other setups in User Setups Folder… I think
I just dont want to mess up my XIAO Round display code…
Hi there,
Yes I copy all of them to a seperate folder as backup, If you change or roll back versions it wipes them out, FYI. 
You know i got the ball example to work… but the basic hello world still throws an error… What da?