spi: added spi feature for all bbb and rpi

samples/spisample.go

@@ -0,0 +1,53 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/kidoman/embd"
+
+	_ "github.com/kidoman/embd/host/all"
+)
+
+func main() {
+	var err error
+	err = embd.InitSPI()
+	if err != nil {
+		panic(err)
+	}
+	defer embd.CloseSPI()
+
+	spiBus := embd.NewSPIBus(embd.SPI_MODE_0, 0, 1000000, 8, 0)
+	defer spiBus.Close()
+
+	dataBuf := make([]uint8, 3)
+	dataBuf[0] = uint8(1)
+	dataBuf[1] = uint8(2)
+	dataBuf[2] = uint8(3)
+
+	err = spiBus.TransferAndRecieveData(dataBuf)
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Println("Recived data is: %v", dataBuf)
+
+	dataReceived, err := spiBus.ReceiveData(3)
+	if err != nil {
+		panic(err)
+	}
+
+	fmt.Println("Recived data is: %v", dataReceived)
+
+	dataByte := byte(1)
+	receivedByte, err := spiBus.TransferAndReceiveByte(dataByte)
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println("Recived byte is: %v", receivedByte)
+
+	receivedByte, err = spiBus.ReceiveByte()
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println("Recived byte is: %v", receivedByte)
+}