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st7789.go
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st7789.go
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// Package st7789 implements a driver for the ST7789 TFT displays, it comes in various screen sizes.
//
// Datasheet: https://cdn-shop.adafruit.com/product-files/3787/3787_tft_QT154H2201__________20190228182902.pdf
//
package st7789 // import "tinygo.org/x/drivers/st7789"
import (
"image/color"
"machine"
"time"
"errors"
)
type Rotation uint8
// Device wraps an SPI connection.
type Device struct {
bus machine.SPI
dcPin machine.Pin
resetPin machine.Pin
blPin machine.Pin
width int16
height int16
columnOffsetCfg int16
rowOffsetCfg int16
columnOffset int16
rowOffset int16
rotation Rotation
batchLength int32
isBGR bool
}
// Config is the configuration for the display
type Config struct {
Width int16
Height int16
Rotation Rotation
RowOffset int16
ColumnOffset int16
}
// New creates a new ST7789 connection. The SPI wire must already be configured.
func New(bus machine.SPI, resetPin, dcPin, blPin machine.Pin) Device {
dcPin.Configure(machine.PinConfig{Mode: machine.PinOutput})
resetPin.Configure(machine.PinConfig{Mode: machine.PinOutput})
blPin.Configure(machine.PinConfig{Mode: machine.PinOutput})
return Device{
bus: bus,
dcPin: dcPin,
resetPin: resetPin,
blPin: blPin,
}
}
// Configure initializes the display with default configuration
func (d *Device) Configure(cfg Config) {
if cfg.Width != 0 {
d.width = cfg.Width
} else {
d.width = 240
}
if cfg.Height != 0 {
d.height = cfg.Height
} else {
d.height = 240
}
d.rotation = cfg.Rotation
if cfg.RowOffset != 0 {
d.rowOffsetCfg = cfg.RowOffset
} else {
d.rowOffsetCfg = 80
}
if cfg.ColumnOffset != 0 {
d.columnOffsetCfg = cfg.ColumnOffset
}
d.batchLength = int32(d.width)
if d.height > d.width {
d.batchLength = int32(d.height)
}
d.batchLength += d.batchLength & 1
// reset the device
d.resetPin.High()
time.Sleep(5 * time.Millisecond)
d.resetPin.Low()
time.Sleep(20 * time.Millisecond)
d.resetPin.High()
time.Sleep(150 * time.Millisecond)
// Common initialization
d.Command(SWRESET)
time.Sleep(150 * time.Millisecond)
d.Command(SLPOUT)
time.Sleep(500 * time.Millisecond)
d.Command(COLMOD)
d.Data(0x55)
time.Sleep(10 * time.Millisecond)
d.SetRotation(d.rotation)
d.Command(CASET)
d.Data(0x00)
d.Data(uint8(d.columnOffset))
d.Data((240 + uint8(d.columnOffset)) >> 8)
d.Data(((240 + uint8(d.columnOffset)) >> 8) & 0xFF)
d.Command(RASET)
d.Data(0x00)
d.Data(uint8(d.rowOffset))
d.Data((240 + uint8(d.rowOffset)) >> 8)
d.Data(((240 + uint8(d.rowOffset)) >> 8) & 0xFF)
d.InvertColors(true)
d.Command(NORON)
time.Sleep(10 * time.Millisecond)
d.Command(DISPON)
time.Sleep(500 * time.Millisecond)
d.blPin.High()
}
// Display does nothing, there's no buffer as it might be too big for some boards
func (d *Device) Display() error {
return nil
}
// SetPixel sets a pixel in the screen
func (d *Device) SetPixel(x int16, y int16, c color.RGBA) {
if x < 0 || y < 0 ||
(((d.rotation == NO_ROTATION || d.rotation == ROTATION_180) && (x >= d.width || y >= d.height)) ||
((d.rotation == ROTATION_90 || d.rotation == ROTATION_270) && (x >= d.height || y >= d.width))) {
return
}
d.FillRectangle(x, y, 1, 1, c)
}
// setWindow prepares the screen to be modified at a given rectangle
func (d *Device) setWindow(x, y, w, h int16) {
x += d.columnOffset
y += d.rowOffset
d.Tx([]uint8{CASET}, true)
d.Tx([]uint8{uint8(x << 8), uint8(x), uint8((x + w - 1) >> 8), uint8(x + w - 1)}, false)
d.Tx([]uint8{RASET}, true)
d.Tx([]uint8{uint8(y >> 8), uint8(y), uint8((y + h - 1) >> 8), uint8(y + h - 1)}, false)
d.Command(RAMWR)
}
// FillRectangle fills a rectangle at a given coordinates with a color
func (d *Device) FillRectangle(x, y, width, height int16, c color.RGBA) error {
k, i := d.Size()
if x < 0 || y < 0 || width <= 0 || height <= 0 ||
x >= k || (x+width) > k || y >= i || (y+height) > i {
return errors.New("rectangle coordinates outside display area")
}
d.setWindow(x, y, width, height)
c565 := RGBATo565(c)
c1 := uint8(c565 >> 8)
c2 := uint8(c565)
data := make([]uint8, d.batchLength*2)
for i := int32(0); i < d.batchLength; i++ {
data[i*2] = c1
data[i*2+1] = c2
}
j := int32(width) * int32(height)
for j > 0 {
if j >= d.batchLength {
d.Tx(data, false)
} else {
d.Tx(data[:j*2], false)
}
j -= d.batchLength
}
return nil
}
// FillRectangle fills a rectangle at a given coordinates with a buffer
func (d *Device) FillRectangleWithBuffer(x, y, width, height int16, buffer []color.RGBA) error {
i, j := d.Size()
if x < 0 || y < 0 || width <= 0 || height <= 0 ||
x >= i || (x+width) > i || y >= j || (y+height) > j {
return errors.New("rectangle coordinates outside display area")
}
if int32(width)*int32(height) != int32(len(buffer)) {
return errors.New("buffer length does not match with rectangle size")
}
d.setWindow(x, y, width, height)
k := int32(width) * int32(height)
data := make([]uint8, d.batchLength*2)
offset := int32(0)
for k > 0 {
for i := int32(0); i < d.batchLength; i++ {
c565 := RGBATo565(buffer[offset+i])
c1 := uint8(c565 >> 8)
c2 := uint8(c565)
data[i*2] = c1
data[i*2+1] = c2
}
if k >= d.batchLength {
d.Tx(data, false)
} else {
d.Tx(data[:k*2], false)
}
k -= d.batchLength
offset += d.batchLength
}
return nil
}
// DrawFastVLine draws a vertical line faster than using SetPixel
func (d *Device) DrawFastVLine(x, y0, y1 int16, c color.RGBA) {
if y0 > y1 {
y0, y1 = y1, y0
}
d.FillRectangle(x, y0, 1, y1-y0+1, c)
}
// DrawFastHLine draws a horizontal line faster than using SetPixel
func (d *Device) DrawFastHLine(x0, x1, y int16, c color.RGBA) {
if x0 > x1 {
x0, x1 = x1, x0
}
d.FillRectangle(x0, y, x1-x0+1, y, c)
}
// FillScreen fills the screen with a given color
func (d *Device) FillScreen(c color.RGBA) {
if d.rotation == NO_ROTATION || d.rotation == ROTATION_180 {
d.FillRectangle(0, 0, d.width, d.height, c)
} else {
d.FillRectangle(0, 0, d.height, d.width, c)
}
}
// SetRotation changes the rotation of the device (clock-wise)
func (d *Device) SetRotation(rotation Rotation) {
madctl := uint8(0)
switch rotation % 4 {
case 0:
madctl = MADCTL_MX | MADCTL_MY
d.rowOffset = d.rowOffsetCfg
d.columnOffset = d.columnOffsetCfg
break
case 1:
madctl = MADCTL_MY | MADCTL_MV
d.rowOffset = d.columnOffsetCfg
d.columnOffset = d.rowOffsetCfg
break
case 2:
d.rowOffset = 0
d.columnOffset = 0
break
case 3:
madctl = MADCTL_MX | MADCTL_MV
d.rowOffset = 0
d.columnOffset = 0
break
}
if d.isBGR {
madctl |= MADCTL_BGR
}
d.Command(MADCTL)
d.Data(madctl)
}
// Command sends a command to the display
func (d *Device) Command(command uint8) {
d.Tx([]byte{command}, true)
}
// Command sends a data to the display
func (d *Device) Data(data uint8) {
d.Tx([]byte{data}, false)
}
// Tx sends data to the display
func (d *Device) Tx(data []byte, isCommand bool) {
if isCommand {
d.dcPin.Low()
d.bus.Tx(data, nil)
} else {
d.dcPin.High()
d.bus.Tx(data, nil)
}
}
// Size returns the current size of the display.
func (d *Device) Size() (w, h int16) {
if d.rotation == NO_ROTATION || d.rotation == ROTATION_180 {
return d.width, d.height
}
return d.height, d.width
}
// EnableBacklight enables or disables the backlight
func (d *Device) EnableBacklight(enable bool) {
if enable {
d.blPin.High()
} else {
d.blPin.Low()
}
}
// InverColors inverts the colors of the screen
func (d *Device) InvertColors(invert bool) {
if invert {
d.Command(INVON)
} else {
d.Command(INVOFF)
}
}
// IsBGR changes the color mode (RGB/BGR)
func (d *Device) IsBGR(bgr bool) {
d.isBGR = bgr
}
// RGBATo565 converts a color.RGBA to uint16 used in the display
func RGBATo565(c color.RGBA) uint16 {
r, g, b, _ := c.RGBA()
return uint16((r & 0xF800) +
((g & 0xFC00) >> 5) +
((b & 0xF800) >> 11))
}