GxEPD2-esphome/tools/gxepd2_harness/run_wrapper_harness.h

#pragma once

// Drives a real GxEPD2_BW<Driver,H>/GxEPD2_3C<Driver,H> wrapper template -
// the actual class GxEPD2 example sketches (and the pre-rewrite gxepd2
// component) instantiate - through one full-screen update via its real
// public API (init/setFullWindow/firstPage/fillScreen+drawPixel/nextPage),
// instead of calling the bare driver's writeImage()/refresh() ourselves.
// This is what actually exercises whatever the wrapper's own firstPage()/
// nextPage() do internally (writeImageForFullRefresh, embedded priming,
// etc.) - which run_harness.h's direct calls don't necessarily match.

#include <cstdio>

#include "spy/Adafruit_GFX.h"
#include "spy/Arduino.h"
#include "spy/SPI.h"
#include "trace.h"

template<typename Driver> struct Peek : Driver {
  using Driver::Driver;
  int busy_level() const { return this->_busy_level; }
  uint16_t reset_duration() const { return this->_reset_duration; }
};

// WrapperT: GxEPD2_BW<PeekDriverT, H> or GxEPD2_3C<PeekDriverT, H> -
// the caller picks which, since that's a fact about the panel (its
// catalog.json "wrapper" field), not something this harness infers.
// PeekDriverT: the same Peek<Driver> passed as WrapperT's first template
// argument - repeated here since GxEPD2_BW/3C don't expose it as a nested
// typedef we could pull back out.
template<typename WrapperT, typename PeekDriverT> void run_wrapper_harness(const char *name, bool three_color) {
  printf("=== %s (via wrapper template) ===\n", name);

  constexpr int16_t CS = 10, DC = 11, RST = 12, BUSY = 13;
  Trace::set_dc_pin(DC);

  WrapperT display(PeekDriverT(CS, DC, RST, BUSY));
  printf("busy_level=%d reset_duration=%u\n", display.epd2.busy_level(), display.epd2.reset_duration());
  Trace::last_busy_release_value = display.epd2.busy_level() == HIGH ? LOW : HIGH;
  display.epd2.selectSPI(SPI, SPISettings());

  printf("--- init(0) ---\n");
  display.init(0);

  printf("--- setFullWindow/firstPage/fillScreen+drawPixel/nextPage ---\n");
  display.setFullWindow();
  display.firstPage();
  do {
    display.fillScreen(GxEPD_WHITE);
    display.drawPixel(0, 0, GxEPD_BLACK);
    if (three_color)
      display.drawPixel(1, 0, GxEPD_RED);
  } while (display.nextPage());
}