Android Question Use Android tablet with /dev/ttyS0 serial port

[Mike1970]

Hi everyone,
I have a project to do that involves using an Android Tablet.
This tablet has several ports and one of these (/dev/ttyS0) is used by a MIFARE UART card reader (called ICM523).

Here on the forum I'm not able to find the correct way to interact with a hardware serial port in order to send and receive bytes... please tell me that it is possible...

Thanks in advance

 

[aeric]

I think it can be achieved using asyncstreams.

[B4X] AsyncStreams Tutorial

New video tutorial: AsyncStreams allows you to read data from an InputStream and write data to an OutputStream without blocking your program. The reading and writing are done with two separate threads. When new data is available the NewData event is raised with the data. When you write data...

www.b4x.com

 

[agraham]

Unless your device is rooted then I don't think this is possible unless there is already a driver accessible to apps installed on the tablet. The fact that the tablet has this port and that you know that it exists would imply to me that this port is likely intended for apps to use and so I would have thought the manufacturer had provided a driver for it. Have you checked with the manufacturers' documentation?

 

[Mike1970]

Unless your device is rooted then I don't think this is possible unless there is already a driver accessible to apps installed on the tablet. The fact that the tablet has this port and that you know that it exists would imply to me that this port is likely intended for apps to use and so I would have thought the manufacturer had provided a driver for it. Have you checked with the manufacturers' documentation?

Hi Agraham,
the manufacturer did not provided any driver. He said it is just a TTY port. Actually I've enumerated all the ports and looks like there are many after ttyS0.
To enumerate the ports, I've used the library found here:
https://www.b4x.com/android/forum/threads/gpio-and-uart.100811/#post-634049
I've tried to send a transmission but no data are received.
I'm trying to interface to a RFID reader with a UART port on it that needs to be set with a baud rate of 115200 and 8N1 dataframe.
The additional questio is how to set the "8N1" parameter.

I've no error using that library, even looking at unfiltered logs.

 

[agraham]

Perhaps I am wrong but I thought that you need a rooted device and an app with root permissions to access any of the system file system folders. Someone with lower level experience of Android than I will have to chip in if they have the relevant knowledge.

Rs232 access denied to /dev/ttyAMA1

I have an industrial Tablet with RS232 BUILT-IN I must read data from RS232 : /dev/ttyAMA1 using Dim sout As OutputStream ' serial out stream Dim sinp As InputStream ' serial in stream StdOut.Initialize ' initialize string builder for StdOut StdErr.Initialize ' initialize...

www.b4x.com

 

[Mike1970]

Hi, I'm using a rooted device.
Using the library I mentioned above in the post #4 IT WORK.
What the problem was?
After struggling with libraries and software, I finally managed to breack the seal and OPEN the Android Panel.
Result: there was a defective contact on the RFID connector....
It seems to work now.
Thank you for your time.

 

[agraham]

Hi, I'm using a rooted device.

You didn't say that in response to my post#2 . Glad you got it working.

 

[Mike1970]

You didn't say that in response to my post#2 . Glad you got it working.

Sorry Agraham, I did not saw your statement. Thanks again.