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void EpdIf::SpiTransfer(unsigned char data){
	// dc pin handled externaly
	gpio_set_level((gpio_num_t)CS_PIN, LOW);	
	// SPI Transfer
	spi_transaction_t t;
	memset(&t, 0, sizeof(t));       //Zero out the transaction
	t.length=8;                     //Command is 8 bits
	t.tx_buffer=&data;               //The data
	ret=spi_device_transmit(spi, &t);  //Transmit!
	assert(ret==ESP_OK);
	gpio_set_level((gpio_num_t)CS_PIN, HIGH);
}

int EpdIf::IfInit(void) {
	gpio_set_direction((gpio_num_t)PIN_CS, GPIO_MODE_OUTPUT);
        gpio_set_direction((gpio_num_t)PIN_RESET, GPIO_MODE_OUTPUT);
	gpio_set_direction((gpio_num_t)PIN_DC, GPIO_MODE_OUTPUT);
	gpio_set_direction((gpio_num_t)PIN_MOSI, GPIO_MODE_OUTPUT);
	gpio_set_direction((gpio_num_t)PIN_BUSY, GPIO_MODE_INPUT);
	
	spi_bus_config_t buscfg;
	buscfg.miso_io_num = -1;
	buscfg.mosi_io_num = PIN_MOSI;
	buscfg.sclk_io_num = PIN_CLK;
	buscfg.quadwp_io_num = -1;
	buscfg.quadhd_io_num = -1;
	buscfg.max_transfer_sz = 5*1024;
	
	spi_device_interface_config_t dev_config;
	dev_config.mode             = 0;
	dev_config.cs_ena_posttrans = 0;
	dev_config.cs_ena_pretrans  = 0;
	dev_config.clock_speed_hz   = 10*1000*1000;
	dev_config.spics_io_num     = PIN_CS;
	dev_config.flags            = 0;
	dev_config.queue_size       = 7;
	
	//Initialize the SPI bus
	ret=spi_bus_initialize(HSPI_HOST, &buscfg, 1);
	printf("SPI: bus initialization done\r\n");
	assert(ret==ESP_OK);
	
	//Attach the display
	ret=spi_bus_add_device(HSPI_HOST, &dev_config, &spi);
	printf("SPI: display device added to spi bus (%d)\r\n", HSPI_HOST);
	assert(ret==ESP_OK);
		
	return 0;
}

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int Epd::Init(const unsigned char* lut) {
    printf("epd1n54: Init start\r\n");
	
	/* this calls the peripheral hardware interface, see epdif */
    if (IfInit() != 0) {
        printf("epd1n54: init error\r\n");
		return -1;
    }
    /* EPD hardware init start */
    printf("epd1n54: Init done\r\n");
	
   this->lut = lut;
    Reset();
    SendCommand(DRIVER_OUTPUT_CONTROL);
    SendData((EPD_HEIGHT - 1) & 0xFF);
    SendData(((EPD_HEIGHT - 1) >> 8) & 0xFF);
    SendData(0x00);                     // GD = 0; SM = 0; TB = 0;
    SendCommand(BOOSTER_SOFT_START_CONTROL);
    SendData(0xD7);
    SendData(0xD6);
    SendData(0x9D);
    SendCommand(WRITE_VCOM_REGISTER);
    SendData(0xA8);                     // VCOM 7C
    SendCommand(SET_DUMMY_LINE_PERIOD);
    SendData(0x1A);                     // 4 dummy lines per gate
    SendCommand(SET_GATE_TIME);
    SendData(0x08);                     // 2us per line
    SendCommand(DATA_ENTRY_MODE_SETTING);
    SendData(0x03);                     // X increment; Y increment
    SetLut(this->lut);
    /* EPD hardware init end */
    return 0;
}

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// CLK - GPIO 18
#define PIN_CLK 18 // yellow

// MOSI - GPIO 23
#define PIN_MOSI 23 // blue

// RESET - GPIO 16
#define PIN_RESET 16 // white

// DC - GPIO 17
#define PIN_DC 17 // green

// CS - GPIO 5
#define PIN_CS 5 // orange

// Busy - GPIO 4
#define PIN_BUSY 4 // violett

Code: Select all

spi_bus_config_t buscfg={};