mirror of
https://github.com/tinygo-org/drivers.git
synced 2026-08-16 21:03:23 +00:00
Yurii Soldak
92 lines
2.5 KiB
Go
92 lines
2.5 KiB
Go
package main
|
|
|
|
// Example program for the ST7735 display (Waveshare 1.44" LCD HAT) using the rpio driver on a Raspberry Pi.
|
|
// Build command:
|
|
// GOOS=linux GOARCH=arm64 go build -o rpio-example ./examples/rpio/
|
|
|
|
import (
|
|
"fmt"
|
|
"image/color"
|
|
"time"
|
|
|
|
go_rpio "github.com/stianeikeland/go-rpio/v4"
|
|
"tinygo.org/x/drivers"
|
|
"tinygo.org/x/drivers/rpio"
|
|
"tinygo.org/x/drivers/st7735"
|
|
)
|
|
|
|
var (
|
|
black = color.RGBA{0, 0, 0, 255}
|
|
colors = [...]color.RGBA{
|
|
{255, 0, 0, 255}, // red
|
|
{0, 255, 0, 255}, // green
|
|
{0, 0, 255, 255}, // blue
|
|
{255, 255, 0, 255}, // yellow
|
|
}
|
|
)
|
|
|
|
func main() {
|
|
if err := go_rpio.Open(); err != nil {
|
|
fmt.Println("Error opening GPIO:", err)
|
|
return
|
|
}
|
|
defer go_rpio.Close()
|
|
|
|
// Initialize SPI and pins
|
|
spi := rpio.NewSPI()
|
|
resetPin := rpio.NewPin(27)
|
|
dcPin := rpio.NewPin(25)
|
|
csPin := rpio.NewPin(8)
|
|
blPin := rpio.NewPin(24)
|
|
|
|
rotatePin := rpio.NewPin(20) // middle button on the HAT
|
|
rotatePin.Pin.PullUp() // enable pull-up resistor, our wrapper sets only input mode automatically
|
|
|
|
// Initialize display
|
|
device := st7735.New(spi, resetPin, dcPin, csPin, blPin)
|
|
device.Configure(st7735.Config{
|
|
Width: 128,
|
|
Height: 128,
|
|
Model: st7735.GREENTAB,
|
|
RowOffset: 3,
|
|
ColumnOffset: 2,
|
|
})
|
|
device.InvertColors(false)
|
|
device.EnableBacklight(true)
|
|
device.IsBGR(true) // no effect w/o rotation!
|
|
device.SetRotation(st7735.NO_ROTATION)
|
|
|
|
width, height := device.Size()
|
|
|
|
// Clear display
|
|
device.FillScreen(black)
|
|
|
|
// Draw rectangles in a loop, clockwise rotation of colors
|
|
pos := 0
|
|
for {
|
|
device.FillRectangle(0, 0, width/2, height/2, colors[(pos+0)%len(colors)]) // top left
|
|
device.FillRectangle(0, height/2, width/2, height/2, colors[(pos+1)%len(colors)]) // bottom left
|
|
device.FillRectangle(width/2, height/2, width/2, height/2, colors[(pos+2)%len(colors)]) // bottom right
|
|
device.FillRectangle(width/2, 0, width/2, height/2, colors[(pos+3)%len(colors)]) // top right
|
|
device.FillRectangle(0, 0, 10, 10, black) // rotation marker
|
|
pos++
|
|
|
|
timeout := time.Now().Add(1 * time.Second)
|
|
for time.Now().Before(timeout) {
|
|
// check button pressed
|
|
if !rotatePin.Get() {
|
|
currentRotation := device.Rotation()
|
|
newRotation := (currentRotation + 1) % 4
|
|
device.SetRotation(drivers.Rotation(newRotation))
|
|
// wait for button release
|
|
for !rotatePin.Get() {
|
|
time.Sleep(10 * time.Millisecond)
|
|
}
|
|
break
|
|
}
|
|
time.Sleep(50 * time.Millisecond)
|
|
}
|
|
|
|
}
|
|
}
|