sdcard: add support for fatfs

examples/sdcard/tinyfs/main.go

@@ -0,0 +1,49 @@
+package main
+
+import (
+	"fmt"
+	"machine"
+	"time"
+
+	"github.com/tinygo-org/tinyfs/fatfs"
+	"tinygo.org/x/drivers/examples/sdcard/tinyfs/console"
+	"tinygo.org/x/drivers/sdcard"
+)
+
+var (
+	spi    machine.SPI
+	sckPin machine.Pin
+	sdoPin machine.Pin
+	sdiPin machine.Pin
+	csPin  machine.Pin
+	ledPin machine.Pin
+)
+
+func main() {
+	waitSerial()
+
+	sd := sdcard.New(spi, sckPin, sdoPin, sdiPin, csPin)
+	err := sd.Configure()
+	if err != nil {
+		fmt.Printf("%s\r\n", err.Error())
+		for {
+			time.Sleep(time.Hour)
+		}
+	}
+
+	filesystem := fatfs.New(&sd)
+
+	// Configure FATFS with sector size (must match value in ff.h - use 512)
+	filesystem.Configure(&fatfs.Config{
+		SectorSize: 512,
+	})
+
+	console.RunFor(&sd, filesystem)
+}
+
+// Wait for user to open serial console
+func waitSerial() {
+	for !machine.Serial.DTR() {
+		time.Sleep(100 * time.Millisecond)
+	}
+}