ESP32 timer clarification - Help Wanted

RE: ESP32 timer clarification

frogandtoad — Thu, 21 Apr 2022 17:28:05 +0000

@zander

Posted by: @zander

@inq Yes, I found some info as well, but it was a while ago and at least a few problems have been fixed and there may be workarounds. Part of the problem today was coming up with a test sketch, now that I have the real sketch and hardware done, I can test with the real code. From what I read today I may just delete the timer and re-create it as long as the call to get remaining time works. Worst case I can save a millis() of the start of each timer. I have 3 buttons that trigger 3 different timeouts, that is the reason for this. Tomorrow will be better.

You never responded to my last message on timers:

https://forum.dronebotworkshop.com/help-wanted/using-a-pin-to-signal-another-pin/paged/3/#post-27653

...although not ESP32 related, the theoretical tutorial may help.

RE: ESP32 timer clarification

Ron — Wed, 20 Apr 2022 05:00:44 +0000

@inq Yes, I found some info as well, but it was a while ago and at least a few problems have been fixed and there may be workarounds. Part of the problem today was coming up with a test sketch, now that I have the real sketch and hardware done, I can test with the real code. From what I read today I may just delete the timer and re-create it as long as the call to get remaining time works. Worst case I can save a millis() of the start of each timer. I have 3 buttons that trigger 3 different timeouts, that is the reason for this. Tomorrow will be better.

RE: ESP32 timer clarification

Inq — Wed, 20 Apr 2022 04:30:06 +0000

I don't have any experience with ESP32... yet. I use timers extensively on the ESP8266, JavaScript and Windows programming. So... I Google ESP32 with some of the timer functions you mentioned above and apparently many people have trouble with them. It must be handled differently on an ESP32 than other architectures.

ESP32 timer clarification

Ron — Tue, 19 Apr 2022 20:03:26 +0000

I have a need for an alarm. Once it is going, I may need to set another alarm on the SAME timer, basically determine if the amount of time left on the original timer is more than what I now want then do nothing else (and this is the question) what is the sequence of commands to replace the existing alarm and add a new alarm. I can't tell the difference between TimerEnd and timerStop. Also there is also timerRestart, and timerStart

NOTE these are one shot not repeating alarms, the ISR has NO code other than a status flag to allow me to shut off a led that was lit when the timer started.

Using multiple timers doesn't change my problem much, I still need to understand the purpose of not only the above commands but a couple more now to deal with multiples.