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// +build linux,arm linux,arm64
package unicorn
import (
"image"
"log"
"os"
"os/signal"
"syscall"
"github.com/ecc1/spi"
)
type RealUnicorn2 struct {
BaseUnicorn2
device *spi.Device
}
func (u *RealUnicorn2) renderImage(im image.Image) {
b := im.Bounds()
width, height := b.Dx(), b.Dy()
sz := (width * height * 3) + 1
write := make([]byte, sz)
// Write leading bit
write[0] = 0x72
// Write color values
ix := 1
for x := 0; x < width; x++ {
for y := 0; y < height; y++ {
col := im.At(x, y)
r, g, b, _ := col.RGBA()
write[ix] = byte(r)
ix++
write[ix] = byte(g)
ix++
write[ix] = byte(b)
ix++
}
}
// Write to the device
err := u.device.Transfer(write)
if err != nil {
log.Printf("Error writing to SPI device %v", err)
}
}
// NewUnicorn2 ...
// Constructs a new and improved unicorn from stuff and things
func NewUnicorn2() (*RealUnicorn2, error) {
dev, err := spi.Open("/dev/spidev0.0", 9000000, 0)
if err != nil {
return nil, err
}
return &RealUnicorn2{
BaseUnicorn2{},
dev,
}, nil
}
// StartRender ...
// Passes through to base to actually do the render
func (u *RealUnicorn2) StartRender() chan bool {
return u.StartRenderBase(u.renderImage)
}
// MainLoop ...
// Just blocks until sigterm
func (u *RealUnicorn2) MainLoop() {
c := make(chan os.Signal, 2)
signal.Notify(c, os.Interrupt, syscall.SIGTERM)
<-c
}
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