How to change libuarte rx buffer at any time

RE: How to change libuarte rx buffer at any time

snail_2 — Thu, 02 Feb 2023 11:19:06 GMT

Thanks, problem solved

RE: How to change libuarte rx buffer at any time

Simonr — Thu, 02 Feb 2023 09:40:23 GMT

Can you explain what you mean by the nrf_libuarte_async_rx_free() not working properly? It is intentional that the buffer is only freed on the buffer boundary. It will not work correctly if you don't provide the correct lengths to the rx_free function. If you want to set the buffer sizes after a connection is done, I think you need to uninit and reinitialize the libuarte with this new buffer size. However I don't think it will be necessary if you just set it to 255 bytes, then the iOS devices will be able to use that buffer size as well. If you set the buffer size to 255 bytes and read 184 bytes, the second transfer should be split into two buffers, one of 71 bytes, and the next in 113 bytes.

Best regards,

Simon

RE: How to change libuarte rx buffer at any time

snail_2 — Wed, 01 Feb 2023 03:18:57 GMT

nrf_libuarte_async_rx_free（） is not working properly.

RE: How to change libuarte rx buffer at any time

snail_2 — Tue, 31 Jan 2023 13:27:51 GMT

How to change the libuarte rx buffer to the MTU size set in the connection after a connection.

RE: How to change libuarte rx buffer at any time

snail_2 — Tue, 31 Jan 2023 08:04:45 GMT

Sorry, I wrote it wrong.How to change the buffer to the MTU size set in the connection after a connection.

RE: How to change libuarte rx buffer at any time

Simonr — Tue, 31 Jan 2023 07:17:19 GMT

Same rules/answer applies for the TX buffer as for the RX buffer. The peripheral application won't have a clue if it connects to an Android device or an iOS device, but I guess you can change the buffer after a connection is made to whatever the MTU size is set to in the connection to get the same buffer size as what the central device supports. However, it should also be fine to just set the TX buffer to 244 during init, and then leave it like that when connecting to iOS devices as well.

Best regards,

Simon

RE: How to change libuarte rx buffer at any time

snail_2 — Mon, 30 Jan 2023 13:50:46 GMT

Can I change the tx buffer after initialization

RE: How to change libuarte rx buffer at any time

Simonr — Mon, 30 Jan 2023 13:25:00 GMT

The peripheral application won't have a clue if it connects to an Android device or an iOS device, but I guess you can change the buffer after a connection is made to whatever the MTU size is set to in the connection to get the same buffer size as what the central device supports. However, it should also be fine to just set the RX buffer to 244 during init, and then leave it like that when connecting to iOS devices as well.

Best regards,

Simon