initial commit

device.go

@@ -0,0 +1,86 @@
+package main
+
+import (
+	"fmt"
+	"time"
+
+	"go.bug.st/serial"
+	"go.bug.st/serial/enumerator"
+)
+
+// Device manages the serial connection to the Cardputer.
+type Device struct {
+	PortName string
+	Port     serial.Port
+	Connected bool
+}
+
+// NewDevice creates a new Device instance.
+func NewDevice() *Device {
+	return &Device{}
+}
+
+// FindCardputer searches for a connected Cardputer by VID.
+func (d *Device) FindCardputer() (string, error) {
+	ports, err := enumerator.GetDetailedPortsList()
+	if err != nil {
+		return "", err
+	}
+	for _, port := range ports {
+		if port.VID == "303a" { // Cardputer VID
+			d.PortName = port.Name
+			return port.Name, nil
+		}
+	}
+	return "", fmt.Errorf("Cardputer not found")
+}
+
+// Connect opens the serial port and requests dev mode.
+func (d *Device) Connect() error {
+	if d.PortName == "" {
+		return fmt.Errorf("no port name set")
+	}
+
+	mode := &serial.Mode{
+		BaudRate: 115200,
+	}
+	port, err := serial.Open(d.PortName, mode)
+	if err != nil {
+		return fmt.Errorf("failed to open port: %w", err)
+	}
+
+	d.Port = port
+	d.Connected = true
+
+	// Send dev mode request
+	// 0xAA 0x04 0x00 0x00 0x00 is the command sequence for dev mode
+	_, err = d.Port.Write([]byte{0xAA, 0x04, 0x00, 0x00, 0x00})
+	if err != nil {
+		d.Close()
+		return fmt.Errorf("failed to send dev mode request: %w", err)
+	}
+    
+    // Allow some time for the device to respond or settle if needed
+    time.Sleep(100 * time.Millisecond)
+
+	return nil
+}
+
+// Close closes the serial port.
+func (d *Device) Close() error {
+	if d.Port != nil {
+		err := d.Port.Close()
+		d.Port = nil
+		d.Connected = false
+		return err
+	}
+	return nil
+}
+
+// Write sends data to the device.
+func (d *Device) Write(data []byte) (int, error) {
+	if !d.Connected || d.Port == nil {
+		return 0, fmt.Errorf("device not connected")
+	}
+	return d.Port.Write(data)
+}