Uart sending process was interrupted

RE: Uart sending process was interrupted

FormerMember — Tue, 14 Mar 2017 09:46:28 GMT

My previous answer was not entirely correct. When using BLE and UART, the radio will have higher priority than UART. It means that UART will have to be delayed when the radio radio is being used. So it is therefore not possible to avoid the UART pauses when used in conjuction with UART. To be sure to not loose any data on the UART, I would recommend you to use flow control (HWFC).

RE: Uart sending process was interrupted

copperface — Wed, 08 Mar 2017 06:16:18 GMT

Thank you for your answer. So is there a better way to avoid interrupt sending data via UART?

RE: Uart sending process was interrupted

FormerMember — Tue, 07 Mar 2017 14:12:57 GMT

When using the softdevice, the radio handling has the priority APP_IRQ_PRIORITY_HIGHEST, but the application level events have priority APP_IRQ_PRIORITY_MID. It means that if the UART has priority APP_IRQ_PRIORITY_LOW and if there are some BLE application events, the UART will be interrupted.

The only problem I can think of, if having UART priority higher than BLE application events, is if there is a BLE application event that require the application to send a reply (for example during a bonding process) and it is not able to interrupt a UART interrupt.