LPUART causing deadlock

RE: LPUART causing deadlock

Chris H — Tue, 22 Jun 2021 11:46:28 GMT

Hi,

thank you very much for answering! It seems to work stable with the version you provided, but anyway I will also try the version with the pullups added.

Kind regards,
Christian

RE: LPUART causing deadlock

Simon — Mon, 21 Jun 2021 14:19:05 GMT

Check out this PR as well https://github.com/zephyrproject-rtos/zephyr/pull/36366, which should make LPUART more stable.

RE: LPUART causing deadlock

Krzysztof Chruscinski — Thu, 13 May 2021 08:39:04 GMT

Hi,

the problem is with GPIOTE interrupt level, by default zephyr is using level 5 for it and `NRF_DEFAULT_IRQ_PRIORITY` for others. There is no clear reason for that but it's just been like this for ages. Low power UART assumes that GPIOTE and UARTE interrupts are on the same level and have no protection mechanisms. There is PR with fixes for that https://github.com/nrfconnect/sdk-nrf/pull/4418.

You can try to apply overlay change in hci_lpuart app https://github.com/nrfconnect/sdk-nrf/pull/4418/commits/4dc8fc024d318c47d7c66abc070a513fff846af6

And similar change in nrf9160ns application: github.com/.../267f4410eaecc870e08bc6c1b0cb00b8fd20bc63

RE: LPUART causing deadlock

Simon — Mon, 10 May 2021 14:13:18 GMT

Hello Christian,

There has been some updates to the LPUART driver lately (E.g. PR #4020), would you be able to test the latest NCS master and check if the deadlock still happens? If you still encounter the issue, please tell me and I will try to reproduce/investigate it.

Best regards,

Simon