Merge pull request #6 from kunalpowar/spi

samples/.gitignore

@@ -23,3 +23,6 @@ tmp006
 universalblinker
 us020
 watersensor
+spi
+mcp3008
+spimcp3008

samples/mcp3008.go

@@ -0,0 +1,45 @@
+// +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"
+)
+
+const (
+	channel = 0
+	speed   = 1000000
+	bpw     = 8
+	delay   = 0
+)
+
+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()
+
+	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)
+	}
+}

samples/spi.go

@@ -0,0 +1,48 @@
+// +build ignore
+
+package main
+
+import (
+	"fmt"
+
+	"github.com/kidoman/embd"
+	_ "github.com/kidoman/embd/host/all"
+)
+
+func main() {
+	if err := embd.InitSPI(); err != nil {
+		panic(err)
+	}
+	defer embd.CloseSPI()
+
+	spiBus := embd.NewSPIBus(embd.SPIMode0, 0, 1000000, 8, 0)
+	defer spiBus.Close()
+
+	dataBuf := [3]uint8{1, 2, 3}
+
+	if err := spiBus.TransferAndRecieveData(dataBuf[:]); err != nil {
+		panic(err)
+	}
+
+	fmt.Println("received data is: %v", dataBuf)
+
+	dataReceived, err := spiBus.ReceiveData(3)
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Println("received data is: %v", dataReceived)
+
+	dataByte := byte(1)
+	receivedByte, err := spiBus.TransferAndReceiveByte(dataByte)
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println("received byte is: %v", receivedByte)
+
+	receivedByte, err = spiBus.ReceiveByte()
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println("received byte is: %v", receivedByte)
+}

samples/spimcp3008.go

@@ -0,0 +1,50 @@
+// +build ignore
+
+package main
+
+import (
+	"flag"
+	"fmt"
+	"time"
+
+	"github.com/kidoman/embd"
+	_ "github.com/kidoman/embd/host/all"
+)
+
+const (
+	channel = 0
+	speed   = 1000000
+	bpw     = 8
+	delay   = 0
+)
+
+func main() {
+	flag.Parse()
+	if err := embd.InitSPI(); err != nil {
+		panic(err)
+	}
+	defer embd.CloseSPI()
+
+	bus := embd.NewSPIBus(embd.SPIMode0, channel, speed, bpw, delay)
+	defer bus.Close()
+
+	for i := 0; i < 30; i++ {
+		time.Sleep(1 * time.Second)
+		val, err := getSensorValue(bus)
+		if err != nil {
+			panic(err)
+		}
+		fmt.Printf("value is: %v\n", val)
+	}
+}
+
+func getSensorValue(bus embd.SPIBus) (uint16, error) {
+	data := [3]uint8{1, 128, 0}
+
+	var err error
+	err = bus.TransferAndRecieveData(data[:])
+	if err != nil {
+		return uint16(0), err
+	}
+	return uint16(data[1]&0x03)<<8 | uint16(data[2]), nil
+}