examples: add scanner for Adafruit Clue

Signed-off-by: deadprogram <[email protected]>

Author: deadprogram

examples/clue-scanner/main.go

@@ -0,0 +1,87 @@
+package main
+
+import (
+	"fmt"
+	"image/color"
+	"machine"
+	"time"
+
+	"tinygo.org/x/bluetooth"
+	"tinygo.org/x/drivers/st7789"
+	"tinygo.org/x/tinyterm"
+	"tinygo.org/x/tinyterm/fonts/proggy"
+)
+
+var (
+	display  st7789.Device
+	terminal = tinyterm.NewTerminal(&display)
+
+	black = color.RGBA{0, 0, 0, 255}
+	font  = &proggy.TinySZ8pt7b
+
+	adapter = bluetooth.DefaultAdapter
+)
+
+func main() {
+	initDisplay()
+	time.Sleep(time.Second)
+
+	fmt.Fprintf(terminal, "\nenable interface...")
+	println("enable interface...")
+	must("enable BLE interface", adapter.Enable())
+	time.Sleep(time.Second)
+
+	println("start scan...")
+	fmt.Fprintf(terminal, "\nstart scan...")
+
+	must("start scan", adapter.Scan(scanHandler))
+
+	for {
+		time.Sleep(time.Minute)
+		println("scanning...")
+		fmt.Fprintf(terminal, "\nscanning...")
+	}
+}
+
+func scanHandler(adapter *bluetooth.Adapter, device bluetooth.ScanResult) {
+	println("device:", device.Address.String(), device.RSSI, device.LocalName())
+	fmt.Fprintf(terminal, "\n%s %d %s", device.Address.String(), device.RSSI, device.LocalName())
+}
+
+func must(action string, err error) {
+	if err != nil {
+		for {
+			println("failed to " + action + ": " + err.Error())
+			time.Sleep(time.Second)
+		}
+	}
+}
+
+func initDisplay() {
+	machine.SPI1.Configure(machine.SPIConfig{
+		Frequency: 8000000,
+		SCK:       machine.TFT_SCK,
+		SDO:       machine.TFT_SDO,
+		SDI:       machine.TFT_SDO,
+		Mode:      0,
+	})
+
+	display = st7789.New(machine.SPI1,
+		machine.TFT_RESET,
+		machine.TFT_DC,
+		machine.TFT_CS,
+		machine.TFT_LITE)
+	display.Configure(st7789.Config{
+		Rotation:   st7789.ROTATION_180,
+		Height:     320,
+		FrameRate:  st7789.FRAMERATE_111,
+		VSyncLines: st7789.MAX_VSYNC_SCANLINES,
+	})
+	display.FillScreen(black)
+
+	terminal.Configure(&tinyterm.Config{
+		Font:       font,
+		FontHeight: 10,
+		FontOffset: 6,
+	})
+}