Hello,
Is there any library that allows communication via SPI?
The default serial port works well when the amount of data is small but too slow to transfer data from a few MB. It would be very interesting to be able to operate with SPI communication, this allows for a very wide range of applications as many microcontrollers have SPI support.
Ftdichip.com provided source code and usage example:
A demonstration to show the Android device reading and writing data via the FT311D SPI host:
SPIMasterDemoActivity.apk
https://www.ftdichip.com/Support/SoftwareExamples/Android/Android.zip
Contents of the FT311SPIMasterInterface.java file:
Is there any library that allows communication via SPI?
The default serial port works well when the amount of data is small but too slow to transfer data from a few MB. It would be very interesting to be able to operate with SPI communication, this allows for a very wide range of applications as many microcontrollers have SPI support.
Ftdichip.com provided source code and usage example:
A demonstration to show the Android device reading and writing data via the FT311D SPI host:
SPIMasterDemoActivity.apk
https://www.ftdichip.com/Support/SoftwareExamples/Android/Android.zip
Contents of the FT311SPIMasterInterface.java file:
B4X:
//User must modify the below package with their package name
package com.SPIMasterDemo;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import android.app.Activity;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.hardware.usb.UsbAccessory;
import android.hardware.usb.UsbManager;
import android.os.Handler;
import android.os.Message;
import android.os.ParcelFileDescriptor;
import android.util.Log;
import android.widget.Toast;
/******************************FT311 GPIO interface class******************************************/
public class FT311SPIMasterInterface extends Activity
{
private static final String ACTION_USB_PERMISSION = "com.SPIMasterDemo.USB_PERMISSION";
public UsbManager usbmanager;
public UsbAccessory usbaccessory;
public PendingIntent mPermissionIntent;
public ParcelFileDescriptor filedescriptor;
public FileInputStream inputstream;
public FileOutputStream outputstream;
public boolean mPermissionRequestPending = false;
public boolean READ_ENABLE = true;
public boolean accessory_attached = false;
public handler_thread handlerThread;
private byte [] usbdata;
private byte [] writeusbdata;
private int readcount;
private byte status;
private byte maxnumbytes = (byte) 63; /*maximum data bytes, except command*/
public boolean datareceived = false;
public Context global_context;
public static String ManufacturerString = "mManufacturer=FTDI";
public static String ModelString = "mModel=FTDISPIMasterDemo";
public static String VersionString = "mVersion=1.0";
/*constructor*/
public FT311SPIMasterInterface(Context context){
super();
global_context = context;
/*shall we start a thread here or what*/
usbdata = new byte[64];
writeusbdata = new byte[64];
/***********************USB handling******************************************/
usbmanager = (UsbManager) context.getSystemService(Context.USB_SERVICE);
// Log.d("LED", "usbmanager" +usbmanager);
mPermissionIntent = PendingIntent.getBroadcast(context, 0, new Intent(ACTION_USB_PERMISSION), 0);
IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);
filter.addAction(UsbManager.ACTION_USB_ACCESSORY_DETACHED);
context.registerReceiver(mUsbReceiver, filter);
inputstream = null;
outputstream = null;
}
/*reset method*/
public void Reset()
{
/*create the packet*/
writeusbdata[0] = (byte) 0x64;
/*send the packet over the USB*/
SendPacket(1);
}
public void SetConfig(byte clockPhase, byte dataOrder, int clockFreq)
{
/*check for maximum clock freq, 24Mhz*/
if(clockFreq > 24000000){
clockFreq = 24000000;
}
writeusbdata[0] = (byte) 0x61;
writeusbdata[1] = clockPhase;
writeusbdata[2] = dataOrder;
writeusbdata[3] = (byte)(clockFreq & 0xff);
writeusbdata[4] = (byte)((clockFreq >> 8) & 0xff);
writeusbdata[5] = (byte)((clockFreq >> 16)& 0xff);
writeusbdata[6] = (byte)((clockFreq >> 24)& 0xff);
SendPacket((int)7);;
}
/*write data*/
public byte SendData(byte numBytes, byte[] buffer, byte [] numReadBytes)
{
status = 0x00; /*error by default*/
/*
* if num bytes are more than maximum limit
*/
if(numBytes < 1){
/*return the status with the error in the command*/
return status;
}
/*check for maximum limit*/
if(numBytes > maxnumbytes){
numBytes = maxnumbytes;
}
/*prepare the packet to be sent*/
for(int count = 0;count<numBytes;count++)
{
writeusbdata[count+1] = buffer[count];
}
/*prepare the usbpacket*/
writeusbdata[0] = (byte) 0x62;
SendPacket((int)(numBytes+1));
datareceived = false;
/*wait while the data is received*/
/*FIXME, may be create a thread to wait on , but any
* way has to wait in while loop
*/
while(true){
if(datareceived == true){
break;
}
}
/*success by default*/
status = 0x00;
if(usbdata[0] == 0x62)
{
/*copy the received data into the buffer*/
for(int count=0;count<(readcount-1);count++){
buffer[count] = usbdata[count+1];
}
/*update the received length*/
numReadBytes[0] = (byte)(readcount-1);
}
/*read the next usb data*/
datareceived = false;
return status;
}
/*write data*/
public byte ReadData(byte numBytes, byte[] buffer, byte [] numReadBytes)
{
status = 0x00; /*error by default*/
/*
* if num bytes are more than maximum limit
*/
if(numBytes < 1){
/*return the status with the error in the command*/
return status;
}
/*check for maximum limit*/
if(numBytes > maxnumbytes){
numBytes = maxnumbytes;
}
/*prepare the packet to be sent*/
for(int count = 0;count<numBytes;count++)
{
writeusbdata[count+1] = buffer[count];
}
/*prepare the usbpacket*/
writeusbdata[0] = (byte) 0x63;
SendPacket((int)(numBytes+1));
datareceived = false;
/*wait while the data is received*/
/*FIXME, may be create a thread to wait on , but any
* way has to wait in while loop
*/
while(true){
if(datareceived == true){
break;
}
}
/*success by default*/
status = 0x00;
if(usbdata[0] == 0x63)
{
/*copy the received data into the buffer*/
for(int count=0;count<(readcount-1);count++){
buffer[count] = usbdata[count+1];
}
/*update the received length*/
numReadBytes[0] = (byte)(readcount-1);
/*read the next usb data*/
datareceived = false;
}
return status;
}
/*method to send on USB*/
private void SendPacket(int numBytes)
{
try {
if(outputstream != null){
outputstream.write(writeusbdata, 0,numBytes);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/*resume accessory*/
public void ResumeAccessory()
{
// Intent intent = getIntent();
if (inputstream != null && outputstream != null) {
return;
}
UsbAccessory[] accessories = usbmanager.getAccessoryList();
if(accessories != null)
{
Toast.makeText(global_context, "Accessory Attached", Toast.LENGTH_SHORT).show();
}
else
{
accessory_attached = false;
return;
}
UsbAccessory accessory = (accessories == null ? null : accessories[0]);
if (accessory != null) {
if( -1 == accessory.toString().indexOf(ManufacturerString))
{
Toast.makeText(global_context, "Manufacturer is not matched!", Toast.LENGTH_SHORT).show();
return;
}
if( -1 == accessory.toString().indexOf(ModelString))
{
Toast.makeText(global_context, "Model is not matched!", Toast.LENGTH_SHORT).show();
return;
}
if( -1 == accessory.toString().indexOf(VersionString))
{
Toast.makeText(global_context, "Version is not matched!", Toast.LENGTH_SHORT).show();
return;
}
Toast.makeText(global_context, "Manufacturer, Model & Version are matched!", Toast.LENGTH_SHORT).show();
accessory_attached = true;
if (usbmanager.hasPermission(accessory)) {
OpenAccessory(accessory);
}
else
{
synchronized (mUsbReceiver) {
if (!mPermissionRequestPending) {
Toast.makeText(global_context, "Request USB Permission", Toast.LENGTH_SHORT).show();
usbmanager.requestPermission(accessory,
mPermissionIntent);
mPermissionRequestPending = true;
}
}
}
} else {}
}
/*destroy accessory*/
public void DestroyAccessory(){
global_context.unregisterReceiver(mUsbReceiver);
if(accessory_attached == true)
{
READ_ENABLE = false; // set false condition for handler_thread to exit waiting data loop
byte [] tmpnRBytes = {0};
byte [] temp2 = new byte[64];
ReadData((byte)3,temp2, tmpnRBytes); // send dummy data for instream.read going
try{Thread.sleep(10);}
catch(Exception e){}
}
CloseAccessory();
}
/*********************helper routines*************************************************/
public void OpenAccessory(UsbAccessory accessory)
{
filedescriptor = usbmanager.openAccessory(accessory);
if(filedescriptor != null){
usbaccessory = accessory;
FileDescriptor fd = filedescriptor.getFileDescriptor();
inputstream = new FileInputStream(fd);
outputstream = new FileOutputStream(fd);
/*check if any of them are null*/
if(inputstream == null || outputstream==null){
return;
}
}
handlerThread = new handler_thread(inputstream);
handlerThread.start();
}
private void CloseAccessory()
{
try{
if(filedescriptor != null)
filedescriptor.close();
}catch (IOException e){}
try {
if(inputstream != null)
inputstream.close();
} catch(IOException e){}
try {
if(outputstream != null)
outputstream.close();
}catch(IOException e){}
/*FIXME, add the notfication also to close the application*/
filedescriptor = null;
inputstream = null;
outputstream = null;
System.exit(0);
}
/***********USB broadcast receiver*******************************************/
private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver()
{
@Override
public void onReceive(Context context, Intent intent)
{
String action = intent.getAction();
if (ACTION_USB_PERMISSION.equals(action))
{
synchronized (this)
{
UsbAccessory accessory = (UsbAccessory) intent.getParcelableExtra(UsbManager.EXTRA_ACCESSORY);
if (intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false))
{
Toast.makeText(global_context, "Allow USB Permission", Toast.LENGTH_SHORT).show();
OpenAccessory(accessory);
}
else
{
Toast.makeText(global_context, "Deny USB Permission", Toast.LENGTH_SHORT).show();
Log.d("LED", "permission denied for accessory "+ accessory);
}
mPermissionRequestPending = false;
}
}
else if (UsbManager.ACTION_USB_ACCESSORY_DETACHED.equals(action))
{
CloseAccessory();
}else
{
Log.d("LED", "....");
}
}
};
/*usb input data handler*/
private class handler_thread extends Thread {
FileInputStream instream;
handler_thread(FileInputStream stream ){
instream = stream;
}
public void run()
{
while(READ_ENABLE == true)
{
try
{
/*dont overwrite the previous buffer*/
if((instream != null) && (datareceived==false))
{
readcount = instream.read(usbdata,0,64);
if(readcount > 0)
{
datareceived = true;
/*send only when you find something*/
}
}
}catch (IOException e){}
}
}
}
}
