From f20896ef3b147ac07769eb36c67ba436c6d2ed22 Mon Sep 17 00:00:00 2001
From: Martin Ashby <martin@martin-laptop.lan>
Date: Mon, 28 May 2018 16:29:18 +0100
Subject: New unicorns for displaing animated gifs! Tests pass on both old &
 new for fakes

---
 unicorn/RealUnicorn2.go | 69 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)
 create mode 100644 unicorn/RealUnicorn2.go

(limited to 'unicorn/RealUnicorn2.go')

diff --git a/unicorn/RealUnicorn2.go b/unicorn/RealUnicorn2.go
new file mode 100644
index 0000000..991e79f
--- /dev/null
+++ b/unicorn/RealUnicorn2.go
@@ -0,0 +1,69 @@
+// +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
+}
+
+// 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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