使用Golang实现的操作ST7789,适用于无CS引脚的240x204 LCD显示屏。 目前仅在Raspberry zero 2w上测试通过。
本库根据Python版 https://github.com/solinnovay/Python_ST7789 移植而来，并在此基础上实现了RGBA转RGB565,支持透明图层。
go get github.com/manx98/go-st7789package main
import (
"context"
ST7789 "github.com/manx98/go-st7789"
"github.com/stianeikeland/go-rpio/v4"
"image"
"image/gif"
"log"
"os"
"sync"
"time"
)
// displayGIF
//
// @Description: 显示GIF图片
// @param ctx
// @param canvas 画布
// @param filePath GIF路径
func displayGIF(ctx context.Context, canvas *ST7789.Canvas, filePath string) {
f, err := os.OpenFile(filePath, os.O_RDONLY, os.ModePerm)
if err != nil {
log.Fatalf("failed to open: %v", err)
}
defer func() {
if err = f.Close(); err != nil {
log.Fatalf("failed to close: %v", err)
}
}()
all, err := gif.DecodeAll(f)
if err != nil {
log.Fatalf("failed to decode: %v", err)
}
showWork := make(chan image.Image, 1)
waitGroup := sync.WaitGroup{}
displayCtx, cancelFunc := context.WithCancel(ctx)
waitGroup.Add(1)
var totalTime int64
var total int64
go func() {
defer func() {
waitGroup.Done()
cancelFunc()
}()
for {
select {
case <-displayCtx.Done():
return
case img := <-showWork:
start := time.Now()
canvas.DrawImage(img)
canvas.Flush()
totalTime += time.Now().Sub(start).Milliseconds()
total++
}
}
}()
defer func() {
cancelFunc()
waitGroup.Wait()
log.Printf("平均速度：%dms/fps\n", totalTime/total)
}()
for {
for i, img := range all.Image {
select {
case <-displayCtx.Done():
return
case showWork <- img:
time.Sleep(time.Duration(all.Delay[i]) * time.Millisecond * 10)
}
}
if all.LoopCount < 0 {
break
}
if all.LoopCount != 0 {
all.LoopCount -= 1
}
}
}
type MyPin struct {
rpio.Pin
}
func (m *MyPin) SetOutput() {
m.Mode(rpio.Output)
}
type MySpi struct {
}
func (m *MySpi) SpiSpeed(speed uint32) {
rpio.SpiSpeed(int(speed))
}
func (m *MySpi) SetSpiMode3() {
rpio.SpiMode(1, 1)
}
func (m *MySpi) SpiTransmit(data []byte) {
rpio.SpiTransmit(data...)
}
func main() {
if err := rpio.Open(); err != nil {
log.Fatalf("failed to open rpio: %v", err)
}
defer func() {
if err := rpio.Close(); err != nil {
log.Fatalf("failed to close gpio: %v", err)
}
}()
err := rpio.SpiBegin(rpio.Spi0)
if err != nil {
log.Fatalf("failed to begin gpio: %v", err)
}
device := ST7789.NewST7789(
&MySpi{},
&MyPin{rpio.Pin(25)},
&MyPin{rpio.Pin(27)},
&MyPin{rpio.Pin(24)},
ST7789.Screen240X240,
)
canvas := device.GetFullScreenCanvas()
timeout, cancel := context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()
displayGIF(timeout, canvas, "./sample/TeaTime.gif")
canvas.Clear()
canvas.Flush()
}