/
Temper.go
62 lines (53 loc) · 1.24 KB
/
Temper.go
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package main
/*
* Temper.go by Thomas Burke (c) 2015 (tburke@tb99.com)
* based on pcsensor.c by Juan Carlos Perez (c) 2011 (cray@isp-sl.com)
* based on Temper.c by Robert Kavaler (c) 2009 (relavak.com)
*/
import (
"github.com/kylelemons/gousb/usb"
"log"
"fmt"
)
func temperature() (float64, error) {
ctx := usb.NewContext()
defer ctx.Close()
devs, err := ctx.ListDevices(func(desc *usb.Descriptor) bool {
return desc.Vendor == 0x0c45 && desc.Product == 0x7401
})
defer func() {
for _, d := range devs {
d.Close()
}
}()
if err != nil {
return 0.0, err
}
if len(devs) == 0 {
return 0.0, fmt.Errorf("No thermometers found.")
}
dev := devs[0]
if err = dev.SetConfig(1); err != nil {
return 0.0, err
}
ep, err := dev.OpenEndpoint(1, 1, 0, 0x82)
if err != nil {
return 0.0, err
}
if _, err = dev.Control(0x21, 0x09, 0x0200, 0x01, []byte{0x01, 0x80, 0x33, 0x01, 0x00, 0x00, 0x00, 0x00}); err != nil {
return 0.0, err
}
buf := make([]byte, 8)
if _, err = ep.Read(buf); err != nil {
return 0.0, err
}
return float64(buf[4]) + float64(buf[5])/256, nil
}
func main() {
c, err := temperature()
if err == nil {
log.Printf("Temperature: %.2fF %.2fC\n", 9.0/5.0*c+32, c)
} else {
log.Fatalf("Failed: %s", err)
}
}