chore: init bj_power monorepo (dashboard/mes/wms/wms_client/workstation), clear subproject git metadata and align naming to folder names

bj_power_wms_client/internal/serialport/port.go

@@ -0,0 +1,77 @@
+package serialport
+
+import (
+	"fmt"
+	"io"
+	"log"
+	"time"
+
+	"go.bug.st/serial"
+
+	"bjhardman.cn/bjhardman/hougai_insize_micrometer/insize"
+)
+
+type Port struct {
+	port   serial.Port
+	frames chan insize.Frame
+	errs   chan error
+	done   chan struct{}
+}
+
+func Open(name string, baud int) (*Port, error) {
+	mode := &serial.Mode{
+		BaudRate: baud,
+		DataBits: 8,
+		Parity:   serial.NoParity,
+		StopBits: serial.OneStopBit,
+	}
+	sp, err := serial.Open(name, mode)
+	if err != nil {
+		return nil, fmt.Errorf("打开串口 %s: %w", name, err)
+	}
+	if err := sp.SetReadTimeout(500 * time.Millisecond); err != nil {
+	}
+
+	p := &Port{
+		port:   sp,
+		frames: make(chan insize.Frame, 16),
+		errs:   make(chan error, 4),
+		done:   make(chan struct{}),
+	}
+	go p.readLoop()
+	return p, nil
+}
+
+func (p *Port) Frames() <-chan insize.Frame { return p.frames }
+
+func (p *Port) Errors() <-chan error { return p.errs }
+
+func (p *Port) Close() error {
+	close(p.done)
+	return p.port.Close()
+}
+
+func (p *Port) readLoop() {
+	reader := insize.NewReader(p.port)
+	for {
+		select {
+		case <-p.done:
+			return
+		default:
+		}
+		f, err := reader.ReadFrame()
+		if err != nil {
+			if err == io.EOF || err == io.ErrUnexpectedEOF {
+				p.errs <- fmt.Errorf("串口读取结束: %w", err)
+				return
+			}
+			log.Printf("serialport: 跳过非法帧: %v", err)
+			continue
+		}
+		select {
+		case p.frames <- f:
+		case <-p.done:
+			return
+		}
+	}
+}