golang libusb wraper
https://pkg.go.dev/github.com/google/gousb
package main
import (
"fmt"
"log"
"github.com/google/gousb"
)
func main() {
// Initialize a new Context.
ctx := gousb.NewContext()
defer ctx.Close()
// Iterate through available Devices, finding all that match a known VID/PID.
vid, pid := gousb.ID(0x04f2), gousb.ID(0xb531)
devs, err := ctx.OpenDevices(func(desc *gousb.DeviceDesc) bool {
// this function is called for every device present.
// Returning true means the device should be opened.
return desc.Vendor == vid && desc.Product == pid
})
// All returned devices are now open and will need to be closed.
for _, d := range devs {
defer d.Close()
}
if err != nil {
log.Fatalf("OpenDevices(): %v", err)
}
if len(devs) == 0 {
log.Fatalf("no devices found matching VID %s and PID %s", vid, pid)
}
// Pick the first device found.
dev := devs[0]
// Switch the configuration to #2.
cfg, err := dev.Config(2)
if err != nil {
log.Fatalf("%s.Config(2): %v", dev, err)
}
defer cfg.Close()
// In the config #2, claim interface #3 with alt setting #0.
intf, err := cfg.Interface(3, 0)
if err != nil {
log.Fatalf("%s.Interface(3, 0): %v", cfg, err)
}
defer intf.Close()
// In this interface open endpoint #6 for reading.
epIn, err := intf.InEndpoint(6)
if err != nil {
log.Fatalf("%s.InEndpoint(6): %v", intf, err)
}
// And in the same interface open endpoint #5 for writing.
epOut, err := intf.OutEndpoint(5)
if err != nil {
log.Fatalf("%s.OutEndpoint(5): %v", intf, err)
}
// Buffer large enough for 10 USB packets from endpoint 6.
buf := make([]byte, 10*epIn.Desc.MaxPacketSize)
total := 0
// Repeat the read/write cycle 10 times.
for i := 0; i < 10; i++ {
// readBytes might be smaller than the buffer size. readBytes might be greater than zero even if err is not nil.
readBytes, err := epIn.Read(buf)
if err != nil {
fmt.Println("Read returned an error:", err)
}
if readBytes == 0 {
log.Fatalf("IN endpoint 6 returned 0 bytes of data.")
}
// writeBytes might be smaller than the buffer size if an error occurred. writeBytes might be greater than zero even if err is not nil.
writeBytes, err := epOut.Write(buf[:readBytes])
if err != nil {
fmt.Println("Write returned an error:", err)
}
if writeBytes != readBytes {
log.Fatalf("IN endpoint 5 received only %d bytes of data out of %d sent", writeBytes, readBytes)
}
total += writeBytes
}
fmt.Printf("Total number of bytes copied: %d\n", total)
}
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