usb keyboard demo
https://github.com/m5stack/M5Cardputer/tree/master/examples/Basic/keyboard

Masterkey - USB WiFi Keylogger
https://github.com/justcallmekoko/USBKeylogger

Use cad plane to measure dimensions is 12 mm

Check if the wiring is correct

new link
https://lang-ship.com/reference/unofficial/M5StickC/Device/SPI/SD/

https://protopedia.net/prototype/2395
https://github.com/610t/M5bit-less

no M5-Core to try
https://github.com/m5stack/M5Tough/blob/master/src/M5Display.h

class M5Display : public TFT_eSPI {
    public:
      static M5Display* instance;
      M5Display();
      void begin();
      void sleep();
      void wakeup();
      void setBrightness(uint8_t brightness);
      void clearDisplay(uint32_t color=ILI9341_BLACK) { fillScreen(color); }
      void clear(uint32_t color=ILI9341_BLACK) { fillScreen(color); }
      void display() {}

so you can try this

#include <M5Display.h>

M5.Lcd.setBrightness(value);    //uint8_t  Brightness (0: Off - 255:Full)

https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/docs/UIFlow-StickC-Book-English.pdf

1.M5Stack.Lcd use Brightness (0: Off - 255:Full)
https://github.com/m5stack/m5-docs/blob/master/docs/en/api/lcd.md#setbrightness

https://github.com/Bodmer/TFT_eSPI#tips
or 2.edit User_Setup.h or rename

// ########################################################
// Section 2. Define the pins that are used to interface with the display here
//#######################################################

// If a backlight control signal is available then define the TFT_BL pin in Section 2
// below. The backlight will be turned ON when tft.begin() is called, but the library
// needs to know if the LEDs are ON with the pin HIGH or LOW. If the LEDs are to be
// driven with a PWM signal or turned OFF/ON then this must be handled by the user
// sketch. e.g. with digitalWrite(TFT_BL, LOW);

#define TFT_BL   32            // LED back-light control pin
#define TFT_BACKLIGHT_ON HIGH  // Level to turn ON back-light (HIGH or LOW)

https://github.com/Bodmer/TFT_eSPI
compiles to 293KB

#define SerialMon Serial
#include <TFT_eSPI.h>
TFT_eSPI Tft = TFT_eSPI();
void debug(String msg) {
    SerialMon.print(msg);
    Tft.print(msg);
}

void debugln(String msg) {
    SerialMon.println(msg);
    Tft.println(msg);
}

void setup() {
    SerialMon.begin(115200);
    Tft.init();
    Tft.fillScreen(TFT_BLACK);
    Tft.setTextSize(3);
    Tft.setTextColor(TFT_WHITE, TFT_BLACK);
    debugln(F("If found, call"));
    debugln(F("xxxxxxxx"));
    debugln(F("xxxxxxxxxxxxx"));
    debugln(F(""));
    debugln(F("or return to"));
    debugln(F("xxxxxxxxxx"));
    debugln(F("xxxxxxxx"));
    debugln(F("xxxxxxxxxxxx"));
    debugln(F("xxxxxxxxxxxx"));
    }

void loop() {
}

https://forum.m5stack.com/topic/3613/how-to-run-lvgl-on-m5stack/14#

https://grabcad.com/library/m5stack_m5stackcore2-1