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embd/samples/mcp3008.go
2014-05-22 02:33:24 +05:30

43 lines
846 B
Go

// +build ignore
// this sample uses the mcp3008 package to interface with the 8-bit ADC and works without code change on bbb and rpi
package main
import (
"flag"
"fmt"
"time"
"github.com/kidoman/embd"
"github.com/kidoman/embd/convertors/mcp3008"
_ "github.com/kidoman/embd/host/all"
)
func main() {
flag.Parse()
fmt.Println("this is a sample code for mcp3008 10bit 8 channel ADC")
if err := embd.InitSPI(); err != nil {
panic(err)
}
defer embd.CloseSPI()
channel := 0
speed := 1000000
bpw := 8
delay := 0
spiBus := embd.NewSPIBus(embd.SPIMode0, channel, speed, bpw, delay)
defer spiBus.Close()
adc := mcp3008.New(mcp3008.SingleMode, spiBus)
for i := 0; i < 20; i++ {
time.Sleep(1 * time.Second)
val, err := adc.AnalogValueAt(0)
if err != nil {
panic(err)
}
fmt.Printf("analog value is: %v\n", val)
}
}