240x240 TFT panel with M5StickC Plus2 & GC9A01

main.cpp

// #include <M5GFX.h>
#include <LovyanGFX.hpp>
#include <Arduino.h>

#define CHK_PIN 25

#define SCL_SCLK 26
#define SDA_MOSI 25
#define CS_CS 32
#define DC_DC 33


// M5StickC. Plus 2

// Default display - ST7789V2 / 135 x 240
// G15 - TFT_MOSI
// G13 - TFT_CLK
// G14 - TFT_DC
// G5 - TFT_CS
// G12 - TFT_RST
// G27 - TFT_BL

// HY2.0 - 4P
// GND - 5V - G32 - G33

// TOP
// GND - 5Vout - G26 - G36(in)/G25(out) - G0 - BAT - 3Vout - 5Vin




int counter = 0;
// M5GFX display;

class LGFX : public lgfx::LGFX_Device
{
    lgfx::Panel_GC9A01 _panel_instance;
    lgfx::Bus_SPI _bus_instance;

public:
    LGFX()
    {
        { // SPI bus config
            auto cfg = _bus_instance.config();
            cfg.spi_host = VSPI_HOST;
            cfg.spi_mode = 0;
            cfg.freq_write = 40000000;
            cfg.freq_read = 16000000;
            cfg.spi_3wire = false;
            cfg.use_lock = true;
            cfg.dma_channel = 1;
            cfg.pin_sclk = SCL_SCLK;
            cfg.pin_mosi = SDA_MOSI;
            cfg.pin_miso = -1;
            cfg.pin_dc = DC_DC;
            _bus_instance.config(cfg);
            _panel_instance.setBus(&_bus_instance);
        }

        { // Panel config
            auto cfg = _panel_instance.config();
            cfg.pin_cs = CS_CS;
            cfg.pin_rst = -1;
            cfg.pin_busy = -1;
            cfg.panel_width = 240;
            cfg.panel_height = 240;
            cfg.offset_x = 0;
            cfg.offset_y = 0;
            cfg.offset_rotation = 0;
            cfg.dummy_read_pixel = 8;
            cfg.dummy_read_bits = 1;
            cfg.readable = false;
            cfg.invert = true;
            cfg.rgb_order = false;
            cfg.dlen_16bit = false;
            cfg.bus_shared = true;
            _panel_instance.config(cfg);
        }

        setPanel(&_panel_instance);
    }
};

LGFX display;
int cx, cy;

void setup(void) {
    Serial.begin(115200);
    // display.init();
    // display.setFont(&fonts::FreeSans18pt7b);

    // display.setTextDatum(textdatum_t::middle_center);
    // display.drawString("Hello.", display.width() / 2, display.height() / 2);

    // display.startWrite();

    display.init();
    display.setRotation(0);
    display.fillScreen(TFT_BLACK);

    // border, -1 radius needed with my display
    cx = display.width() / 2;
    cy = display.height() / 2;
    int radius = cx-1;

    // Draw yellow circle border (thin line)
    display.drawCircle(cx, cy, radius, TFT_YELLOW);
    display.fillCircle(cx, cy, radius - 3, TFT_BLACK);

    // display.drawString("Hello GC9A01!", 10, 10);

    display.setFont(&fonts::Font4);
    display.setTextSize(2);

    // Centered string
    display.setTextColor(TFT_YELLOW);
    display.setTextDatum(middle_center); 
    display.drawString("Hello!", cx, cy);

    // pinMode(CHK_PIN, OUTPUT); // this would mess up lgfx
}

void loop(void) {

    display.startWrite();
    display.clear();
    display.setTextDatum(middle_center);

    if (counter%2) {
        display.setTextColor(TFT_RED);
        display.drawString("High", cx, cy);
        // digitalWrite(CHK_PIN, HIGH);
    } else {
        display.setTextColor(TFT_GREEN);
        display.drawString("Low", cx, cy);
        // digitalWrite(CHK_PIN, LOW);
    }
    Serial.printf("counter: %d\n", counter);
    counter++;
    display.endWrite();
    vTaskDelay(1000 / portTICK_PERIOD_MS);
}

platformio.ini

[env:default]
board = m5stick-c
platform = espressif32
; force_verbose = true
monitor_speed = 115200
monitor_filters = 
    time
framework = arduino
lib_deps = 
    m5stack/M5GFX@^0.2.9
    lovyan03/LovyanGFX@^1.1.12