98 lines
2.6 KiB
Go
98 lines
2.6 KiB
Go
package main
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import (
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"flag"
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"fmt"
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"log"
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"github.com/kylelemons/gousb/usb"
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"github.com/kylelemons/gousb/usbid"
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)
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var (
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debug = flag.Int("debug", 0, "libusb debug level (0..3)")
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)
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func main() {
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flag.Parse()
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// Only one context should be needed for an application. It should always be closed.
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ctx = usb.NewContext()
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defer ctx.Close()
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// Debugging can be turned on; this shows some of the inner workings of the libusb package.
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ctx.Debug(*debug)
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// ListDevices is used to find the devices to open.
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devs, err := ctx.ListDevices(func(bus, addr int, desc *usb.Descriptor) bool {
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// After inspecting the descriptor, return true or false depending on whether
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// the device is "interesting" or not. Any descriptor for which true is returned
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// generates a DeviceInfo which is retuned in a slice.
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return true
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})
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// All DeviceInfo returned from ListDevices must be closed.
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defer func() {
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for _, d := range devs {
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d.Close()
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}
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}()
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// ListDevices can occaionally fail, so be sure to check its return value.
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if err != nil {
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log.Fatalf("list: %s", err)
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}
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for _, dev := range devs {
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// The descriptor (which contains useful information) can always be obtained again
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// from a DeviceInfo.
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desc, err := dev.Descriptor()
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if err != nil {
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log.Printf("desc: %s", err)
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continue
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}
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// The DeviceInfo contains the bus number and bus address of the device.
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bus := dev.BusNumber()
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addr := dev.Address()
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// The usbid package can be used to print out human readable information.
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fmt.Printf("%03d:%03d %s\n", bus, addr, usbid.Describe(desc))
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fmt.Printf(" Protocol: %s\n", usbid.Classify(desc))
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// The configurations can be examined from the DeviceInfo, though they can only
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// be set once the device is opened. All configuration references must be closed,
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// to free up the memory in libusb.
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cfgs, err := dev.Configurations()
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defer func() {
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for _, cfg := range cfgs {
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cfg.Close()
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}
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}()
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if err != nil {
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log.Printf(" - configs: %s", err)
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continue
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}
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// This loop just uses more of the built-in and usbid pretty printing to list
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// the USB devices.
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for _, cfg := range cfgs {
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fmt.Printf(" %s:\n", cfg)
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for _, alt := range cfg.Interfaces {
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fmt.Printf(" --------------\n")
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for _, iface := range alt {
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fmt.Printf(" %s\n", iface)
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fmt.Printf(" %s\n", usbid.Classify(iface))
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for _, end := range iface.Endpoints {
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fmt.Printf(" %s\n", end)
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}
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}
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}
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fmt.Printf(" --------------\n")
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}
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// To actually interact with a device, DevInfo.Open() returns a device handle
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// which can be used to do more I/O with the device and its endpoints.
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}
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}
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