ESP32 Forum

Posted: **Wed Dec 18, 2019 10:24 pm**

Hello,
I need a quicker query whether a new message has arrived. 3ms, even one ms is too long. When a message arrives, I have enough time to evaluate it or wait until the queue is full ... but not for the check in the working-loop.
What is a faster alternative to the standard question:
if (xQueueReceive(CAN_cfg.rx_queue, &rx_frame, 3 * portTICK_PERIOD_MS) == pdTRUE)
{.....}
???
Thanx

Posted: **Thu Dec 19, 2019 1:46 pm**

Can I directly read the status register from the CAN-controller whether a new message has arrived? If yes - how ?
Thank you.

Posted: **Thu Dec 19, 2019 2:21 pm**

You are allowed to specify a wait time of 0. In that case if there are no pending messages to receive then the function just immediately terminates. So, you can poll for CAN frames that way.

Posted: **Thu Dec 19, 2019 5:22 pm**

Very simple and it works...
Thank you

ESP32 Forum

ESP32 CAN fast receive-check

ESP32 CAN fast receive-check

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