72 lines
1.3 KiB
Go
72 lines
1.3 KiB
Go
package temper
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import (
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"fmt"
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"github.com/google/gousb"
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)
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type TEMPer struct {
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Device *gousb.Device
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}
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// GetDevice will return the first temper device found.
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func GetDevice() (*TEMPer, error) {
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ctx := gousb.NewContext()
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defer ctx.Close()
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vid, pid := gousb.ID(0x0c45), gousb.ID(0x7401)
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devs, err := ctx.OpenDevices(func(desc *gousb.DeviceDesc) bool {
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return desc.Vendor == vid && desc.Product == pid
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})
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if err != nil {
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return &TEMPer{}, err
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}
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if len(devs) == 0 {
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return &TEMPer{}, fmt.Errorf("no devices found matching VID %s and PID %s", vid, pid)
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}
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devs[0].SetAutoDetach(true)
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for i := 1; i <= len(devs)-1; i++ {
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defer devs[i].Close()
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}
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return &TEMPer{Device: devs[0]}, nil
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}
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func (d *TEMPer) GetTemperature() (float64, error) {
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cfg, err := d.Device.Config(1)
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if err != nil {
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return 0, err
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}
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defer cfg.Close()
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intf, err := cfg.Interface(1, 0)
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if err != nil {
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return 0, err
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}
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defer intf.Close()
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epIn, err := intf.InEndpoint(0x82)
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if err != nil {
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return 0, err
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}
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_, err = d.Device.Control(
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0x21, 0x09, 0x0200, 0x01, []byte{0x01, 0x80, 0x33, 0x01, 0x00, 0x00, 0x00, 0x00},
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)
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if err != nil {
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return 0, err
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}
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buf := make([]byte, 8)
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if _, err = epIn.Read(buf); err != nil {
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return 0, err
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}
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return float64(buf[2]) + float64(buf[3])/256, nil
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}
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