app_timer use with uart_cli

RE: app_timer use with uart_cli

maxx44 — Thu, 22 Oct 2020 18:45:32 GMT

Einar,

I went through the Application Timer Tutorial again and carefully reviewed the settings I was using.

It turns out I missed applying the APP_TIMER_TICKS macro to the interval in app_timer_start. I had a define all set up for it too! As a result I got some integer value in there that was probably a much shorter interval than I was expecting.

Once I got that straightened out, app_timer for a 1 second interval (using APP_TIMER_TICKS(1000) in app_timer_start) works fine in the SDK example twi_master_with_twis_slave.

Max

RE: app_timer use with uart_cli

maxx44 — Thu, 22 Oct 2020 14:30:53 GMT

Thanks Einar. I see app_timer2.c is being used.

In the meantime, I tried setting up a hardware nrfx_timer using a method outlined in this forum. That seems to be working nicely but I have some more testing to do.

Before sending a code sample, I think I'll go back to a copy the original example and just add an app_timer to that to make sure I didn't mess up with other things I was trying to implement. That would be additional CLI commands and some GPIO with a PWM output. I'll let you know what that reveals.

Max

RE: app_timer use with uart_cli

Einar Thorsrud — Thu, 22 Oct 2020 08:43:27 GMT

Hi,

Are you using app_timer.c or app_timer2.c? The original app_timer implementation has a known bug where it can expire immediately in some cases with high timeout values. This (and other issues) should be fixed in app_timer2. Migrating to app_timer2 is covered in the last part of the migration guide for SDK 16.

If this is not the issue then it would be interesting to see your code in order to understand what is happening.