[TriEmbed] ESP8266 Programming tip

[John Vaughters]

Rodney,

Ok so does the os_timer_arm use interrupts? That is the part that confuses me. If so than it is not sequential as I expected. But can be made practically sequential with the bool flag concept. In my case the tasks are definitely simple now. What kind of time frame would one expect to be acceptable in an interrupt task?

Thanks,

John Vaughters






On Wednesday, January 27, 2021, 3:55:49 PM EST, Rodney Radford <ncgadgetry at gmail.com> wrote: 





I just looked at the Ticker library routines and they are only a few lines and basically a wrapper around os_timer_arm which is supposed to have 1 ms accuracy, plus or minus 1ms.

Arduino/Ticker.cpp at master · esp8266/Arduino (github.com)

The os functions are documented here:

2c-esp8266_non_os_sdk_api_reference_en (espressif.com)

Three is also an os_timer_arm_us that is supposed to be accurate to 500us (so basically 0.5 ms) so it doesn't really get you much better resolution

But it should be accurate enough for most operations as long as you keep your interrupt handlers short/simple