ESP32C3-2424S012 with GC9A01 display 1.28"

[multiOTP]

/****************************************
 * ESP32C3-2424S012 with GC9A01 display *
*****************************************/
#pragma once
#define LGFX_USE_V1
#include <LovyanGFX.hpp>

#define BACKLIGHT_PIN 3

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

public:
  LGFX(void) {
    {
      // Enable the backlight
      lgfx::gpio_hi(BACKLIGHT_PIN);
      lgfx::pinMode(BACKLIGHT_PIN, lgfx::pin_mode_t::output);

      auto cfg = _bus_instance.config();

      cfg.spi_host    = SPI2_HOST;
      cfg.spi_mode    = 0;
      cfg.freq_write  = 80000000;
      cfg.freq_read   = 20000000;
      cfg.spi_3wire   = false;
      cfg.use_lock    = true;
      cfg.dma_channel = SPI_DMA_CH_AUTO;

      cfg.pin_sclk = 6;
      cfg.pin_mosi = 7;
      cfg.pin_miso = -1;
      cfg.pin_dc   = 2;

      _bus_instance.config(cfg);
      _panel_instance.setBus(&_bus_instance);
    }

    {
      auto cfg = _panel_instance.config();

      cfg.pin_cs   = 10;
      cfg.pin_rst  = -1;
      cfg.pin_busy = -1;

      cfg.panel_width    = 240;
      cfg.panel_height   = 240;
      cfg.memory_width   = 240;
      cfg.memory_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       = false;

      _panel_instance.config(cfg);
    }

    setPanel(&_panel_instance);
  }
};

[5t0x2fH1z]

Text scroll doesn't work with this config thou. It requires cfg.readable = true. Once it is set to true it breaks. I guess cfg.dummy_read_pixel and cfg.dummy_read_bits are misconfigured. Any solution for that?

[marcboon]

If _panel_instance.config.bus_shared = false, then _bus_instance.config.use_lock can also be false, no? The SPI bus doesn't need any locking if the bus is not shared with other peripherals. This saves unnecessary locking/unlocking.