UsbSerial library - Supports FTDI, Arduinos and other USB serial devices

wexican · Jan 8, 2013

Toley said:
Since the library is made to communicate with FTDI/Arduino (which are always 8N1) I don't see the use of changing those settings.

Hi Toley,

I agree the Arduino is fixed at 8N1 but the FTDI devices are not necessarily fixed & are usually settable, e.g. if you plug a FTDI USB to Serial adapter into your desktop pc & open the relevant comport using something like hyperterminal you are given the choice to select these parameters.
Yes most new devices are fixed to 8N1 but there definately are legacy devices out there which are not 8N1. Being able to set data bits to 7 atleast will cover older devices. Also don't forget parity, hardware handshaking etc!

Thanks, Tom

wexican · Jan 8, 2013

Erel said:
@wexican, I will add it if / when they update the native library.

Thanks Erel, I had a feeling you were going to say that!
But in it's current state it is very useable & I like it very much, time to break out the XBee modules & Microchip PICs again, I feel a whole new raft of gadgets being designed!
:sign0060:

sebasianek · Jan 10, 2013

Hi all.
astreams.Write ("abcde". GetBytes ("UTF8")) sends the data to the terminal.
How to receive data from the terminal?:sign0085:

Erel · Jan 10, 2013

AStreams_NewData is raised when data is received. See AsyncStreams tutorial for more information.

mterveen · Jan 10, 2013

thank you - thank you - thank you.

Thuong · Jan 11, 2013

Error opening USB port

Dear Erel
I use your example with : Tablet (android 4.1.1) & FT232R board.
But nothing to happen, on B4A log message "Error opening USB port"

My tablet have OTG

I can not see /dev/ttyUSB0 or similar
Pls help
Thank

Erel said:
This library is a wrapper for this open source project: usb-serial-for-android - Android USB host serial driver library for CDC, FTDI, Arduino and other devices. - Google Project Hosting
It requires Android 3.1+.

Erel · Jan 11, 2013

Android fails to open the USB port.
Try the solution proposed here: http://www.b4x.com/forum/additional...03-usb-rs232-adaptor-driver-5.html#post120979

sebasianek · Jan 11, 2013

Thank you. Now everything works as it should. I receive and send data.

Is it possible to check when the serial interface is connected / installed? Like Usb.IsEnable ?

Erel · Jan 11, 2013

Your activity should be started when the USB is attached. This is the purpose of the intent-filter added with the manifest editor.

microbox · Jan 11, 2013

Trouble running example program

Hi, I'm still new to B4A, I'm now trying to connect my Samsung Tab 7.7 to PC...but I was not able to make it work.
What I did ...
1. Download usb-serial-for-android-v010.jar and the USBSerial to library folder
2. Install the program example to phone.
But no dialog displayed asking whether I want to start your program.
What do you think I'm missing? I hope you anyone can help on this one.

Regards,
microbox

Erel · Jan 11, 2013

Did you try to connect the Samsung device to a USB-serial converter?

Is your device running Android 3+ ?

microbox · Jan 11, 2013

Thanks Erel for the reply, I do have version 3.2 on my device.

Erel said:
Did you try to connect the Samsung device to a USB-serial converter?

I think this part is my trouble...not really clear to me how to :sign0013:
When you say USB-Serial Converter is that the USB to TTL serial converter module? I have 2 of them but only USBpl2303 chip...and there driver is USBpl2303_1.0. But not really sure how to connect them. My observation when I tried to connect the USB serial converter module to my Tablet the module does not power up(no led indicator) unlike when it's connected to the PC.
What I'm really like to see if it's possible on my setup to...
1. Connect my tablet to PC.
2. Connect tablet to serial device LCD.
Hope you can help me.

Thanks in advance,
microbox

Thuong · Jan 12, 2013

Error

Erel said:
Android fails to open the USB port.
Try the solution proposed here: http://www.b4x.com/forum/additional...03-usb-rs232-adaptor-driver-5.html#post120979

Dear Erel
I did that
It is still "Error opening USB port" on log B4A
although Usb Host Controller (from google play) display in Connected USB devices :
6001:0403
FTDI FT232R USB UART

Pls help

scrat · Jan 12, 2013

Hi

i try to use Serial USB example and i have a problem

with a FTDI converter everything works perfectly.
the system prompt to open Serial USB Example, connection and transfer are OK.

With a Leaflabs maple clone from Olimex i always get "Error opening USB port".

I have modified the xml filter with vendor ID and device ID read via lsusb
vendor id is "1eaf" .
and in unfiltered log i have this:

Unable to load component info ResolveInfo{a08f6b88 b4a.example1.main p=0 o=0 m=0x108000}
error java.lang.NumberFormatException: Invalid int: "1eaf"

Vendor Id is in hexadecimal and seems misinterpreted.

Any idea ?

Thanks

Erel · Jan 13, 2013

@microbox, this library doesn't support PL2303 adapters. Try this library instead: PL2303 USB to RS232 adaptor driver

@Thuong, have you added the intent filter? Did you see the permission dialog, asking you to allow the app to access this port?

@scrat, seems like this adapter is not supported by this library.
You can see the supported adapters in the library wiki (there is a link to it in previous pages).

scrat · Jan 13, 2013

hi

I modified th source code for my VENDOR ID and USB ID on the source code from git and now the library works.

i added in CdcAcmSerialDriver.java

supportedDevices.put(Integer.valueOf(UsbId.VENDOR_LEAFLABS),
new int[] {
UsbId.LEAFLABS_MAPLE,
});

in UsbId.java

public static final int VENDOR_LEAFLABS = 0x1eaf;
public static final int LEAFLABS_MAPLE = 0x0004;

device_filter.xml become

<?xml version="1.0" encoding="utf-8"?>
<resources>

<usb-device vendor-id="1027" product-id="24577" />


<usb-device vendor-id="9025" />


<usb-device vendor-id="5824" product-id="1155" />


<usb-device vendor-id="7855" product-id="0004" />

</resources>

if your board is not supported you can try this method

viriato · Jan 17, 2013

Trying your example "USB Serial"

Sorry if this is not the right place to ask ,
I downloaded your example and I followed up your installation procedures and everything looks ok , but I miss probably something , because I got this message ,
can you help ?

-------------------------------------------
Parsing code. Error
Error parsing program.
Error description: Unknown type: usbserial
Are you missing a library reference?
Occurred on line: 15
Dim usb As UsbSerial
------------------------------------
Thanks

Erel · Jan 17, 2013

You should go to the libraries tab (right side of the IDE) and check UsbSerial library.

mikisquiti · Jan 23, 2013

USB to serial

I have downloaded USBSERIALEXAMPLE.ZIP; I have correctly compiled and installed on my Tablet but don't work never; I think my Table don't recognize my Prolific usb to serial convert; otherwaise I don't undestund why don't work never;
pls help me;
Miki

Erel · Jan 23, 2013

This library doesn't support Prolific adapters. There is a link on the first page to a wiki that lists the supported adapters.

UsbSerial library - Supports FTDI, Arduinos and other USB serial devices

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