UARTE does not receive RX RDY on timeout when double buffering

RE: UARTE does not receive RX RDY on timeout when double buffering

EDLT — Mon, 10 Jan 2022 14:09:26 GMT

Okay thanks for confirming my suspicion. I've offloaded the work into a work handler instead that seems to be working well.

RE: UARTE does not receive RX RDY on timeout when double buffering

Jørgen Holmefjord — Fri, 07 Jan 2022 12:40:58 GMT

Hi,

It sounds like that could be the case yes, that you spend too much time in the handler for the software to count the bytes.

Please refer these configs for HW RX byte counting:

Best regards,
Jørgen

RE: UARTE does not receive RX RDY on timeout when double buffering

EDLT — Thu, 06 Jan 2022 15:56:26 GMT

Hi Jørgen ,

I ran a very similar test to the zephyr provided double buffer test. This worked as expected.

Now I'm running into another issue where some characters are dropped. This appears to happen only when a RX timeout occurs.

For example, I might send 100 characters over UART to my 82 byte double buffers (2 x 82 bytes). I get the UART_RX_RDY for the first buffer full with 82 bytes. The second buffer I'll notice all the data is in memory, but the length of data/number of bytes returned is between 15-17 bytes (short 1-3 bytes).

I'm running a loopback at 115,200 baud. If I do nothing in UART_RX_RDY event, I get all the data and the correct length.

If I do too much work in the event, I then start missing characters. I suspect I need to enable UART hardware counting.

Does this sound correct? What steps do I need to take to enable hardware counting?

RE: UARTE does not receive RX RDY on timeout when double buffering

Jørgen Holmefjord — Mon, 03 Jan 2022 10:43:53 GMT

Hi,

Can you post the code you used for the 3 scenarios (preferably with full samples in order to reproduce on our end)?

Best regards,
Jørgen