waxdred / go-i2c-oled Goto Github PK

const (
	SSD1306_CMD                 = 0x80
	SSD1306_SETDISPLAYCLOCKDIV  = 0xD5
	SSD1306_DISPLAYOFF          = 0xAE
	SSD1306_SETMULTIPLEX        = 0xA8
	SSD1306_SETDISPLAYOFFSET    = 0xD3
	SSD1306_SETSTARTLINE        = 0x0
	SSD1306_CHARGEPUMP          = 0x8D
	SSD1306_MEMORYMODE          = 0x20
	SSD1306_SEGREMAP            = 0xA0
	SSD1306_COMSCANDEC          = 0xC8
	SSD1306_SETCOMPINS          = 0xDA
	SSD1306_SETCONTRAST         = 0x81
	SSD1306_SETPRECHARGE        = 0xD9
	SSD1306_SETVCOMDETECT       = 0xDB
	SSD1306_DISPLAYALLON_RESUME = 0xA4
	SSD1306_NORMALDISPLAY       = 0xA6
	SSD1306_EXTERNALVCC         = 0x1
	SSD1306_SWITCHCAPVCC        = 0x2
)

const (
	SSD1309_SETPRECHARGELEVEL = 0xBB
	SSD1309_SETVCOMH          = 0xBE
	SSD1309_NOP               = 0xE3 // No operation command
)

package main

import (
	"image"
	"log"

	"periph.io/x/periph/conn/display/ssd1306"
	"periph.io/x/periph/conn/i2c/i2creg"
	"periph.io/x/periph/host"
)

const (
	SSD1309_DISPLAYOFF          = 0xAE
	SSD1309_SETDISPLAYCLOCKDIV  = 0xD5
	SSD1309_SETMULTIPLEX        = 0xA8
	SSD1309_SETDISPLAYOFFSET    = 0xD3
	SSD1309_SETSTARTLINE        = 0x00
	SSD1309_CHARGEPUMP          = 0x8D
	SSD1309_MEMORYMODE          = 0x20
	SSD1309_SEGREMAP            = 0xA1 // Different from SSD1306
	SSD1309_COMSCANINC          = 0xC0 // Different from SSD1306
	SSD1309_SETCOMPINS          = 0xDA
	SSD1309_SETCONTRAST         = 0x81
	SSD1309_SETPRECHARGE        = 0xD9
	SSD1309_SETVCOMDETECT       = 0xDB
	SSD1309_DISPLAYALLON_RESUME = 0xA4
	SSD1309_NORMALDISPLAY       = 0xA6
	SSD1309_DISPLAYON           = 0xAF
)

func main() {
	// Initialize periph.io.
	if _, err := host.Init(); err != nil {
		log.Fatal(err)
	}

	// Open I2C bus.
	bus, err := i2creg.Open("")
	if err != nil {
		log.Fatal(err)
	}
	defer bus.Close()

	// Create a new display.
	dev, err := ssd1306.NewI2C(bus, &ssd1306.Opts{
		W:         128,
		H:         64,
		Sequential: true, // SSD1309 typically uses Sequential layout
	})
	if err != nil {
		log.Fatal(err)
	}

	// Initialize the display with SSD1309-specific commands.
	cmds := []byte{
		SSD1309_DISPLAYOFF,
		SSD1309_SETDISPLAYCLOCKDIV, 0x80,
		SSD1309_SETMULTIPLEX, 0x3F,
		SSD1309_SETDISPLAYOFFSET, 0x00,
		SSD1309_SETSTARTLINE | 0x00,
		SSD1309_CHARGEPUMP, 0x14,
		SSD1309_MEMORYMODE, 0x00,
		SSD1309_SEGREMAP | 0x01,
		SSD1309_COMSCANINC,
		SSD1309_SETCOMPINS, 0x12,
		SSD1309_SETCONTRAST, 0xCF,
		SSD1309_SETPRECHARGE, 0xF1,
		SSD1309_SETVCOMDETECT, 0x40,
		SSD1309_DISPLAYALLON_RESUME,
		SSD1309_NORMALDISPLAY,
		SSD1309_DISPLAYON,
	}

	for _, cmd := range cmds {
		if err := dev.Command(cmd); err != nil {
			log.Fatal(err)
		}
	}

	// Clear the display.
	img := image.NewGray(image.Rect(0, 0, 128, 64))
	dev.Draw(dev.Bounds(), img, image.Point{})
}