eink/eink.hpp

#pragma once

#include <stdint.h>

#include <avr/pgmspace.h>

#include "../clock.hpp"
#include "../io/io.hpp"

template <typename Spi>
class Epd {
	static constexpr auto width = uint16_t{200};
	static constexpr auto height = uint16_t{200};

	io::Pin<io::P::C1> m_rst;
	io::Pin<io::P::C0> m_dc;
	io::Pin<io::P::C2> m_bsy;

  public:
	Epd() = default;
	~Epd() = default;

	int Init()
	{
		m_rst.dir(io::Dir::OUT);
		m_dc.dir(io::Dir::OUT);
		m_bsy.dir(io::Dir::IN);
		Spi::init();

		/* EPD hardware init start */
		Reset();

		WaitUntilIdle();
		SendCommand(0x12); // SWRESET
		WaitUntilIdle();

		SendCommand(0x01); // Driver output control
		SendData(0xC7);
		SendData(0x00);
		SendData(0x01);

		SendCommand(0x11); // data entry mode
		SendData(0x01);

		SendCommand(0x44); // set Ram-X address start/end position
		SendData(0x00);
		SendData(0x18); // 0x18-->(24+1)*8=200

		SendCommand(0x45); // set Ram-Y address start/end position
		SendData(0xC7);    // 0xC7-->(199+1)=200
		SendData(0x00);
		SendData(0x00);
		SendData(0x00);

		SendCommand(0x3C); // BorderWavefrom
		SendData(0x05);

		SendCommand(0x18); // Read built-in temperature sensor
		SendData(0x80);

		SendCommand(0x4E); // set RAM x address count to 0;
		SendData(0x00);
		SendCommand(0x4F); // set RAM y address count to 0X199;
		SendData(0xC7);
		SendData(0x00);
		WaitUntilIdle();

		/* EPD hardware init end */

		return 0;
	}

	void SendCommand(unsigned char command)
	{
		m_dc = false;
		SpiTransfer(command);
	}

	void SendData(unsigned char data)
	{
		m_dc = true;
		SpiTransfer(data);
	}

	void WaitUntilIdle()
	{
		while (m_bsy) {
			_delay_ms(100);
		}
	}

	void Reset()
	{
		m_rst = true;
		_delay_ms(200);
		m_rst = false; // module reset
		_delay_ms(10);
		m_rst = true;
		_delay_ms(200);
	}

	void DisplayFrame(const unsigned char *frame_buffer_black, const unsigned char *frame_buffer_red)
	{
		SendCommand(0x24);
		for (auto i = uint16_t{0}; i < width * height / 8; i++) {
			SendData(pgm_read_byte(&frame_buffer_black[i]));
		}
		SendCommand(0x26);
		for (auto i = uint16_t{0}; i < width * height / 8; i++) {
			SendData(~pgm_read_byte(&frame_buffer_red[i]));
		}

		SendCommand(0x22);
		SendData(0xF7);
		SendCommand(0x20);
		WaitUntilIdle();
	}

	void DisplayClear()
	{
		SendCommand(0x24);
		for (auto i = uint16_t{0}; i < width * height / 8; i++) {
			SendData(0xff);
		}
		SendCommand(0x26);
		for (auto i = uint16_t{0}; i < width * height / 8; i++) {
			SendData(0x00);
		}

		SendCommand(0x22);
		SendData(0xF7);
		SendCommand(0x20);
		WaitUntilIdle();
	}

	void Sleep()
	{
		SendCommand(0x10); // power setting
		SendData(0x01);    // gate switch to external
		_delay_ms(100);
	}

	void SpiTransfer(unsigned char data)
	{
		Spi::select(true);
		Spi::transfer(data);
		Spi::select(false);
	}
};