I'm experiencing some weird issues when trying to receive data from UART while also connecting to a wifi.

Some details about my setup:

Board: Olimex ESP32-Gateway Rev. G
ESP IDF: 5.1.1
UART: UART1
Baud rate: 2400

My application is very time critical which is why I have configured all application ...

Thanks for the help, I was able to get it to work:

* install driver on task with CPU1 affinity
* set rx fifo full threshold to 1 and enable the corresponding interrupt
* block on DATA event (I use the events to detect a bunch of other conditions as well)
* do non blocking uart_read_bytes
* check ...

That means, other tasks will need to yield before I'm able to receive the event. HAL provided by the IDF.


Not in ESP-IDF. We configure FreeRTOS as pre-emptive, meaning that if something happens (in an interrupt or otherwise) that un-blocks a task that is of higher priority than the one ...

event queues have more latency than that due to FreeRTOS context switches

Sounds quite implausible. Source?


From the FreeRTOS docs:

When a task attempts to read from an empty queue the task will be placed into the Blocked state (so it is not consuming any CPU time and other tasks can run ...

Sorry, I wasn't clear about the uart_read_bytes . I called it busy looping on uart_read_bytes since the only option would be to call it with timeout NON_BLOCKING, since, as you say, otherwise the task will be suspended.

I cannot have the task get suspended because once I receive data on UART, it ...

Hi,

I would like to use custom interrupts for handling UART rx. The reason I cannot use event queues is that I will sometimes need to reply within 300us of receiving a byte (and event queues have more latency than that due to FreeRTOS context switches).

Note: I do not need high throughput, only ...