I tried lots of hours, to get at least one of those waveshare demos for the tiny board ddisplaying something.
Fiddled through the library and include settings.
Compile gives some warnings but no errors
#warning >>>>------>> DMA is not supported on the ESP32 C3 (possible future update)
I adjusted User_setup.h to these active settings
// For ESP32 Dev board (only tested with GC9A01 display)
// The hardware SPI can be mapped to any pins
#define TFT_MOSI 7 // In some display driver board, it might be written as "SDA" and so on.
#define TFT_SCLK 6
#define TFT_CS 5 // Chip select control pin
#define TFT_DC 4 // Data Command control pin
#define TFT_RST 8 // Reset pin (could connect to Arduino RESET pin)
#define TFT_BL 22 // LED back-light
#define GC9A01_DRIVER
Compile and upload ok, backlight on, display black but nothing on display.
Anyy help is well appreciated .....
Ralf
