From e22682db0094881577a58ce8412d74e01135e55e Mon Sep 17 00:00:00 2001
From: The_Spider <nhyatt@smoothnet.org>
Date: Sat, 30 Oct 2021 10:34:00 -0500
Subject: [PATCH] unknown stack error

---
 cmd/go-temper/main.go     | 116 ++++++++++++++++++++++++++++++++++++++
 go.mod                    |   5 ++
 go.sum                    |   2 +
 internal/temper/temper.go |  71 +++++++++++++++++++++++
 4 files changed, 194 insertions(+)
 create mode 100644 cmd/go-temper/main.go
 create mode 100644 go.mod
 create mode 100644 go.sum
 create mode 100644 internal/temper/temper.go

diff --git a/cmd/go-temper/main.go b/cmd/go-temper/main.go
new file mode 100644
index 0000000..ece56a1
--- /dev/null
+++ b/cmd/go-temper/main.go
@@ -0,0 +1,116 @@
+package main
+
+import (
+	"log"
+	"time"
+
+	"gitea.smoothnet.org/nhyatt/go-temper/internal/temper"
+)
+
+func main() {
+	/*
+		temp, err := GetTemperature()
+
+		if err == nil {
+			log.Printf(
+				"Temperature: %.2f°K %.2f°F %.2f°C\n",
+				temp.Temperature+273.15,
+				9.0/5.0*temp.Temperature+32,
+				temp.Temperature,
+			)
+		} else {
+			log.Fatalf("Failed: %s", err)
+		}
+	*/
+	dev, err := temper.GetDevice()
+	if err != nil {
+		log.Fatalf("[FATAL] Unable to get TEMPer Device ID: %v\n", err)
+	}
+
+	defer dev.Device.Close()
+
+	for {
+		temp, err := dev.GetTemperature()
+		if err != nil {
+			log.Printf("[WARNING] Unable to get temperature from device: %v\n", err)
+		} else {
+			log.Printf(
+				"Temperature: %.2f°K %.2f°F %.2f°C\n",
+				temp+273.15,
+				9.0/5.0*temp+32,
+				temp,
+			)
+		}
+
+		time.Sleep(time.Duration(5 * time.Second))
+	}
+}
+
+/*
+type DeviceTemperature struct {
+	Device      *gousb.Device
+	Temperature float64
+}
+
+func GetTemperature() (DeviceTemperature, error) {
+	ctx := gousb.NewContext()
+	defer ctx.Close()
+
+	vid, pid := gousb.ID(0x0c45), gousb.ID(0x7401)
+	devs, err := ctx.OpenDevices(func(desc *gousb.DeviceDesc) bool {
+		return desc.Vendor == vid && desc.Product == pid
+	})
+
+	if err != nil {
+		return DeviceTemperature{}, err
+	}
+
+	if len(devs) == 0 {
+		return DeviceTemperature{}, fmt.Errorf("no devices found matching VID %s and PID %s", vid, pid)
+	}
+
+	// Pick the first device found.
+	dev := devs[0]
+	devs[0].SetAutoDetach(true)
+
+	for _, d := range devs {
+		defer d.Close()
+	}
+
+	temp, err := getDeviceTemperature(dev)
+	return temp, err
+}
+
+func getDeviceTemperature(dev *gousb.Device) (DeviceTemperature, error) {
+	cfg, err := dev.Config(1)
+	if err != nil {
+		return DeviceTemperature{}, err
+	}
+	defer cfg.Close()
+
+	intf, err := cfg.Interface(1, 0)
+	if err != nil {
+		return DeviceTemperature{}, err
+	}
+	defer intf.Close()
+
+	epIn, err := intf.InEndpoint(0x82)
+	if err != nil {
+		return DeviceTemperature{}, err
+	}
+
+	_, err = dev.Control(
+		0x21, 0x09, 0x0200, 0x01, []byte{0x01, 0x80, 0x33, 0x01, 0x00, 0x00, 0x00, 0x00},
+	)
+	if err != nil {
+		return DeviceTemperature{}, err
+	}
+
+	buf := make([]byte, 8)
+	if _, err = epIn.Read(buf); err != nil {
+		return DeviceTemperature{}, err
+	}
+
+	return DeviceTemperature{Device: dev, Temperature: float64(buf[2]) + float64(buf[3])/256}, nil
+}
+*/
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..c1f7db6
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,5 @@
+module gitea.smoothnet.org/nhyatt/go-temper
+
+go 1.17
+
+require github.com/google/gousb v1.1.1
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..1e79240
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,2 @@
+github.com/google/gousb v1.1.1 h1:2sjwXlc0PIBgDnXtNxUrHcD/RRFOmAtRq4QgnFBE6xc=
+github.com/google/gousb v1.1.1/go.mod h1:b3uU8itc6dHElt063KJobuVtcKHWEfFOysOqBNzHhLY=
diff --git a/internal/temper/temper.go b/internal/temper/temper.go
new file mode 100644
index 0000000..d7bf941
--- /dev/null
+++ b/internal/temper/temper.go
@@ -0,0 +1,71 @@
+package temper
+
+import (
+	"fmt"
+
+	"github.com/google/gousb"
+)
+
+type TEMPer struct {
+	Device *gousb.Device
+}
+
+// GetDevice will return the first temper device found.
+func GetDevice() (*TEMPer, error) {
+	ctx := gousb.NewContext()
+	defer ctx.Close()
+
+	vid, pid := gousb.ID(0x0c45), gousb.ID(0x7401)
+	devs, err := ctx.OpenDevices(func(desc *gousb.DeviceDesc) bool {
+		return desc.Vendor == vid && desc.Product == pid
+	})
+
+	if err != nil {
+		return &TEMPer{}, err
+	}
+
+	if len(devs) == 0 {
+		return &TEMPer{}, fmt.Errorf("no devices found matching VID %s and PID %s", vid, pid)
+	}
+
+	devs[0].SetAutoDetach(true)
+
+	for i := 1; i <= len(devs)-1; i++ {
+		defer devs[i].Close()
+	}
+
+	return &TEMPer{Device: devs[0]}, nil
+}
+
+func (d *TEMPer) GetTemperature() (float64, error) {
+	cfg, err := d.Device.Config(1)
+	if err != nil {
+		return 0, err
+	}
+	defer cfg.Close()
+
+	intf, err := cfg.Interface(1, 0)
+	if err != nil {
+		return 0, err
+	}
+	defer intf.Close()
+
+	epIn, err := intf.InEndpoint(0x82)
+	if err != nil {
+		return 0, err
+	}
+
+	_, err = d.Device.Control(
+		0x21, 0x09, 0x0200, 0x01, []byte{0x01, 0x80, 0x33, 0x01, 0x00, 0x00, 0x00, 0x00},
+	)
+	if err != nil {
+		return 0, err
+	}
+
+	buf := make([]byte, 8)
+	if _, err = epIn.Read(buf); err != nil {
+		return 0, err
+	}
+
+	return float64(buf[2]) + float64(buf[3])/256, nil
+}