Declaring timers

[Malcolm]

I want to include a timer within a structure and also within an array. However the SDK uses a macro to define the declaration of a timer. App_timer.h recommends not to define.

Is there a recommended method that can be used?

Eg.

typedef struct {

  uint16_t anInteger;

  app_timer_t aTimer;

} aStructure_t;

Or

app_timer_t timers[0..TIMERS];

Malcolm

[Einar Thorsrud]

Hi,

There is no recommended way (this is not recommended since it is easy to get things wrong). If you do, remember to look closely at the _APP_TIMER_DEF implementation, or observe the preprocessor output to be sure that you did not miss anything. Assuming you use SDK 16 you are probably using app_timer2, and then this is what you need:

#define _APP_TIMER_DEF(timer_id)                                      \
    static app_timer_t CONCAT_2(timer_id,_data) = { {0} };           \
    static const app_timer_id_t timer_id = &CONCAT_2(timer_id,_data)

[Malcolm]

Thank you for a prompt response. I have basically followed your method (less CONCAT2). It is helpful to know I did not miss any alternative.

Malcolm

[Einar Thorsrud]

Hi Malcolm,

No, that should be good. And just to be clear, CONCAT_2 in turn, is just basic concatenation (##). So if the timer was "my_timer" then you would have "my_timer" and "my_timer_data".