From 2c7c91e64775af35732e8233bb7b34f75dbe40cc Mon Sep 17 00:00:00 2001
From: Dave Cheney <dave@cheney.net>
Date: Sun, 25 Oct 2026 13:25:31 +1100
Subject: [PATCH] examples/apa102: add red Cylon sweep example for Blinkt!

---
 examples/apa102/blinkt-cylon/main.go | 37 ++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 examples/apa102/blinkt-cylon/main.go

diff --git a/examples/apa102/blinkt-cylon/main.go b/examples/apa102/blinkt-cylon/main.go
new file mode 100644
index 000000000..1a4c22972
--- /dev/null
+++ b/examples/apa102/blinkt-cylon/main.go
@@ -0,0 +1,37 @@
+// Draws a red Cylon sweep on a Pimoroni Blinkt! connected to the 40 pin
+// header of a Waveshare RP2040-PiZero.
+// https://shop.pimoroni.com/products/blinkt
+package main
+
+import (
+	"image/color"
+	"machine"
+	"time"
+
+	"tinygo.org/x/drivers/apa102"
+)
+
+const numLEDs = 8
+
+func main() {
+	// Blinkt! uses BCM23 for data and BCM24 for clock. These are not
+	// hardware SPI pins on the RP2040, so use software SPI.
+	leds := apa102.NewSoftwareSPI(machine.GP24, machine.GP23, 1)
+
+	var c [numLEDs]color.RGBA
+	pos, dir := 0, 1
+	for {
+		for i := range c {
+			c[i].R /= 4
+			c[i].A = 0x20
+		}
+		c[pos].R = 0xff
+		leds.WriteColors(c[:])
+
+		if pos+dir < 0 || pos+dir >= numLEDs {
+			dir = -dir
+		}
+		pos += dir
+		time.Sleep(80 * time.Millisecond)
+	}
+}