IWRL6432BOOST: "UART Echo Callback" example to transmit only 1 character

Alexander Mruga

Part Number: IWRL6432BOOST
Other Parts Discussed in Thread: MMWAVE-L-SDK

Tool/software:

While playing with the "UART Echo Callback" example, I found out that `UART_write()` does not generate a callback if `UART_Transaction.count = 1`. So, I cannot implement this example to receive 1 character and echo back the same. Everything works fine except that I do not see the activation of `uart_echo_write_callback()`. I tested it for MMWAVE-L-SDK 05.04.00.01 and 05.05.02.00 and both results were negative. Does this mean that I cannot use all the features of `UART_write()` in interrupt mode if I have a reason to transmit only 1 character?

Thanks,

Alex.

9 months ago

0 Sharan S S 9 months ago

TI__Expert 4180 points

Hi,

We are looking into your query. Please allow us a couple of days to respond.

Regards,

Sharan

0 Sharan S S 9 months ago

TI__Expert 4180 points

Hi,

Did you try using any other UART operating mode?

Regards,

Sharan

0 Alexander Mruga 9 months ago in reply to Sharan S S

Prodigy 210 points

Hi,

Of course, I can develop my CLI over UART using a different UART mode. But this simple example looks like a good starting point for my further application development, and setting up the TI reference project to work with 1 character is quite desirable.

Thanks.

0 Alexander Mruga 9 months ago in reply to Sharan S S

Prodigy 210 points

Hi,

Is there any progress on my simple question? Let me rephrase it. Can I use all `UART_write()` functions in interrupt mode if I have a reason to only transmit 1 character? Or do I have some restrictions on callbacks, e.g.

Thanks.

0 Sharan S S 9 months ago in reply to Alexander Mruga

TI__Expert 4180 points

Hi,

You can transmit one character via UART_write(). There are no restrictions on callbacks.

Regards

0 Alexander Mruga 9 months ago in reply to Sharan S S

Prodigy 210 points

Hi,

Thanks, I know I can send one character via UART_write(). My question was can I send one character at a time in interrupt mode and get notified in the callback that the character has been sent. If I can't, is this a driver bug or an undocumented feature?

Regards

0 Sharan S S 9 months ago in reply to Alexander Mruga

TI__Expert 4180 points

Hi,

Yes you can do the transfer for one character.

Regards

0 Alexander Mruga 9 months ago in reply to Sharan S S

Prodigy 210 points

Okay, I'm closing the discussion. Suppose I can organize the UART output buffer management for the critical level case and manage the queue to send the stream through the UART Tx callback to eliminate the overflow. In this case, I don't need to wait for 1 character to be sent, I'd rather wait for the outgoing character batch. But I still don't understand why the callback for sending 1 character is not triggered.

Regards

Sensors

Sensors forum

IWRL6432BOOST: "UART Echo Callback" example to transmit only 1 character