Checksumming and USB port searching works

main.go

@@ -1,5 +1,51 @@
 package main
 
+import (
+	"fmt"
+	"github.com/akamensky/argparse"
+	"go-scsupdate/firmware"
+	"go-scsupdate/usb"
+	"os"
+)
+
 func main() {
-	lsusb()
+	parser := argparse.NewParser("go-scsupdate", "Update Firmware of SCS PACTOR modems")
+	serialDevice := parser.String("s", "serialDevice", &argparse.Options{Required: false, Help: "(optional) serial device the modem is attached to, e.g. /dev/ttyUSB0. If not set, go-scsupdate will search for SCS modems."})
+	_ = parser.String("b", "baudrate", &argparse.Options{Required: false, Help: "(optional) sets the serial baudrate, e.g. 115200"})
+	f := parser.String("f", "file", &argparse.Options{Required: false, Help: "(required) the file to flash, e.g. profi41r.pro"})
+	err := parser.Parse(os.Args)
+	if err != nil {
+		fmt.Print(parser.Usage(err))
+		os.Exit(1)
+	}
+	fmt.Println(*serialDevice)
+	var ports []usb.Scsid
+	if *serialDevice == "" {
+		if ports, err = usb.FindSCS(); err == nil {
+			fmt.Println(ports)
+			if len(ports) == 0 {
+				fmt.Println("Found no SCS modem.")
+				//os.Exit(1)
+			}
+			if len(ports) != 1 {
+				fmt.Println("Found more than one SCS modem. You need to choose one with the -s flag.\nfound: ")
+				for _, p := range ports {
+					fmt.Printf("Port: %30s : Name: %s\n", p.Port, p.Name)
+				}
+			}
+		} else {
+			fmt.Println("Error while seaching SCS modems: ", err)
+		}
+	}
+
+	if !firmware.FwExists(*f) {
+		fmt.Printf("Error: firmware file %s does not exist.\n", *f)
+		os.Exit(1)
+	}
+
+	if !firmware.ChkHeader(*f) {
+		os.Exit(1)
+	} else {
+		fmt.Println("all ok")
+	}
 }