From 32e997346bb5766aefa6ef5f4caa189af128b498 Mon Sep 17 00:00:00 2001
From: Martin Ashby <martin@martin-laptop.lan>
Date: Mon, 21 May 2018 09:54:00 +0100
Subject: Moved unicorn lib to it's own package

---
 unicorn/RealUnicorn.go | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 unicorn/RealUnicorn.go

(limited to 'unicorn/RealUnicorn.go')

diff --git a/unicorn/RealUnicorn.go b/unicorn/RealUnicorn.go
new file mode 100644
index 0000000..4e5c376
--- /dev/null
+++ b/unicorn/RealUnicorn.go
@@ -0,0 +1,66 @@
+// +build linux,arm linux,arm64
+
+package unicorn
+
+import (
+	//"golang.org/x/exp/io/spi"
+	"log"
+
+	"github.com/ecc1/spi"
+)
+
+type RealUnicorn struct {
+	BaseUnicorn
+	device *spi.Device
+}
+
+// NewUnicorn ...
+// Constructs a new real unicorn from fairy dust and sprinkles
+func NewUnicorn() (*RealUnicorn, error) {
+	dev, err := spi.Open("/dev/spidev0.0", 9000000, 0)
+	if err != nil {
+		return nil, err
+	}
+
+	return &RealUnicorn{
+		BaseUnicorn{
+			pixels: makePixels(16, 16),
+		},
+		dev,
+	}, nil
+}
+
+func (u *RealUnicorn) Show() {
+	// Width * height * colours + leading bit
+	width := int(u.GetWidth())
+	height := int(u.GetHeight())
+	sz := (width * height * 3) + 1
+	write := make([]byte, sz)
+
+	// Add the leading bit
+	write[0] = 0x72
+	// Add all the pixel values
+	ix := 1
+	for x := 0; x < width; x++ {
+		for y := 0; y < height; y++ {
+			for j := 0; j < 3; j++ {
+				write[ix] = byte(u.pixels[x][y][j])
+				ix++
+			}
+		}
+	}
+	// Write to the device
+	//err := u.device.Tx(write, nil)
+	err := u.device.Transfer(write)
+	if err != nil {
+		log.Printf("Error writing to SPI device %v", err)
+	}
+}
+
+func (u *RealUnicorn) Off() {
+	u.Close()
+}
+
+func (u *RealUnicorn) Close() error {
+	return u.device.Close()
+}
-- 
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