st7735

README

ST7735 driver

There are multiple devices using the ST7735 chip, and there are multiple versions ST7735B, ST7735R & ST7735S. Two apparently identical displays might have different configurations. The most common issues are:

• Colors are inverted (black is white and viceversa), invert the colors with display.InvertColors(true)
• Colors are not right (red is blue and viceversa, but green is ok), some displays uses BRG instead of RGB for defining colors, change the mode with display.IsBGR(true)
• There is noise/snow/confetti in the screen, probably rows and columns offsets are wrong, configure them with st7735.Config{RowOffset:XX, ColumnOffset:YY}

If nothing of the above works, your device may need a different boot-up process.

Documentation

Overview

Package st7735 implements a driver for the ST7735 TFT displays, it comes in various screen sizes.

Datasheet: https://www.crystalfontz.com/controllers/Sitronix/ST7735R/319/

Index

• Constants
• func RGBATo565(c color.RGBA) uint16
• type Config
• type Device
  • func New(bus machine.SPI, resetPin, dcPin, csPin, blPin machine.Pin) Device
  • func (d *Device) Command(command uint8)
  • func (d *Device) Configure(cfg Config)
  • func (d *Device) Data(data uint8)
  • func (d *Device) Display() error
  • func (d *Device) DrawFastHLine(x0, x1, y int16, c color.RGBA)
  • func (d *Device) DrawFastVLine(x, y0, y1 int16, c color.RGBA)
  • func (d *Device) EnableBacklight(enable bool)
  • func (d *Device) FillRectangle(x, y, width, height int16, c color.RGBA) error
  • func (d *Device) FillRectangleWithBuffer(x, y, width, height int16, buffer []color.RGBA) error
  • func (d *Device) FillScreen(c color.RGBA)
  • func (d *Device) InvertColors(invert bool)
  • func (d *Device) IsBGR(bgr bool)
  • func (d *Device) SetPixel(x int16, y int16, c color.RGBA)
  • func (d *Device) SetRotation(rotation Rotation)
  • func (d *Device) Size() (w, h int16)
  • func (d *Device) Tx(data []byte, isCommand bool)
• type Model
• type Rotation

Constants

const (
	NOP        = 0x00
	SWRESET    = 0x01
	RDDID      = 0x04
	RDDST      = 0x09
	SLPIN      = 0x10
	SLPOUT     = 0x11
	PTLON      = 0x12
	NORON      = 0x13
	INVOFF     = 0x20
	INVON      = 0x21
	DISPOFF    = 0x28
	DISPON     = 0x29
	CASET      = 0x2A
	RASET      = 0x2B
	RAMWR      = 0x2C
	RAMRD      = 0x2E
	PTLAR      = 0x30
	COLMOD     = 0x3A
	MADCTL     = 0x36
	MADCTL_MY  = 0x80
	MADCTL_MX  = 0x40
	MADCTL_MV  = 0x20
	MADCTL_ML  = 0x10
	MADCTL_RGB = 0x00
	MADCTL_BGR = 0x08
	MADCTL_MH  = 0x04
	RDID1      = 0xDA
	RDID2      = 0xDB
	RDID3      = 0xDC
	RDID4      = 0xDD
	FRMCTR1    = 0xB1
	FRMCTR2    = 0xB2
	FRMCTR3    = 0xB3
	INVCTR     = 0xB4
	DISSET5    = 0xB6
	PWCTR1     = 0xC0
	PWCTR2     = 0xC1
	PWCTR3     = 0xC2
	PWCTR4     = 0xC3
	PWCTR5     = 0xC4
	VMCTR1     = 0xC5
	PWCTR6     = 0xFC
	GMCTRP1    = 0xE0
	GMCTRN1    = 0xE1

	GREENTAB   Model = 0
	MINI80x160 Model = 1

	NO_ROTATION  Rotation = 0
	ROTATION_90  Rotation = 1 // 90 degrees clock-wise rotation
	ROTATION_180 Rotation = 2
	ROTATION_270 Rotation = 3
)

Registers

Functions

func RGBATo565

func RGBATo565(c color.RGBA) uint16

RGBATo565 converts a color.RGBA to uint16 used in the display

Types

type Config

type Config struct {
	Width        int16
	Height       int16
	Rotation     Rotation
	Model        Model
	RowOffset    int16
	ColumnOffset int16
}

Config is the configuration for the display

type Device

type Device struct {
	// contains filtered or unexported fields
}

Device wraps an SPI connection.

func New

func New(bus machine.SPI, resetPin, dcPin, csPin, blPin machine.Pin) Device

New creates a new ST7735 connection. The SPI wire must already be configured.

func (*Device) Command

func (d *Device) Command(command uint8)

Command sends a command to the display

func (*Device) Configure

func (d *Device) Configure(cfg Config)

Configure initializes the display with default configuration

func (*Device) Data

func (d *Device) Data(data uint8)

Command sends a data to the display

func (*Device) Display

func (d *Device) Display() error

Display does nothing, there's no buffer as it might be too big for some boards

func (*Device) DrawFastHLine

func (d *Device) DrawFastHLine(x0, x1, y int16, c color.RGBA)

DrawFastHLine draws a horizontal line faster than using SetPixel

func (*Device) DrawFastVLine

func (d *Device) DrawFastVLine(x, y0, y1 int16, c color.RGBA)

DrawFastVLine draws a vertical line faster than using SetPixel

func (*Device) EnableBacklight

func (d *Device) EnableBacklight(enable bool)

EnableBacklight enables or disables the backlight

func (*Device) FillRectangle

func (d *Device) FillRectangle(x, y, width, height int16, c color.RGBA) error

FillRectangle fills a rectangle at a given coordinates with a color

func (*Device) FillRectangleWithBuffer

func (d *Device) FillRectangleWithBuffer(x, y, width, height int16, buffer []color.RGBA) error

FillRectangle fills a rectangle at a given coordinates with a buffer

func (*Device) FillScreen

func (d *Device) FillScreen(c color.RGBA)

FillScreen fills the screen with a given color

func (*Device) InvertColors

func (d *Device) InvertColors(invert bool)

InverColors inverts the colors of the screen

func (*Device) IsBGR

func (d *Device) IsBGR(bgr bool)

IsBGR changes the color mode (RGB/BGR)

func (*Device) SetPixel

func (d *Device) SetPixel(x int16, y int16, c color.RGBA)

SetPixel sets a pixel in the screen

func (*Device) SetRotation

func (d *Device) SetRotation(rotation Rotation)

SetRotation changes the rotation of the device (clock-wise)

func (*Device) Size

func (d *Device) Size() (w, h int16)

Size returns the current size of the display.

func (*Device) Tx

func (d *Device) Tx(data []byte, isCommand bool)

Tx sends data to the display

type Model

type Model uint8

type Rotation

type Rotation uint8