epaper_spi_ssd1681.h

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#pragma once
 
#include "epaper_spi_ssd1683.h"
 
namespace esphome::epaper_spi {
 
// Partial refreshes compare RAM 0x24 (new image) with RAM 0x26 (image on the panel) and drive only changed pixels.
class EPaperSSD1681 : public EPaperSSD1683 {
 public:
  EPaperSSD1681(const char *name, uint16_t width, uint16_t height, const uint8_t *init_sequence,
                size_t init_sequence_length)
      : EPaperSSD1683(name, width, height, init_sequence, init_sequence_length) {
    // 0x12 puts the display option register back to its default, which turns off the RAM ping-pong the panel's
    // OTP enables; without it the controller no longer carries 0x24 over to 0x26 after a partial refresh
    this->software_reset_ = false;
  }
 
 protected:
  // Reads the previous frame to compute the changed window for a partial refresh
  bool needs_previous_frame() const override { return true; }
  // Shrinks the update bounds to the bytes that differ from the frame last sent
  void bounds_from_changes_();
  bool transfer_data() override;
  void refresh_screen(bool partial) override;
};
 
}  // namespace esphome::epaper_spi