SWI user flags

Question

Hello to all nordic jedi masters out there! 
 I am using nRF SDK v11.0 with the nRF52832. 
 I am a little bit confused about the usage/meaning of the flag argument in the nrf_drv_swi_trigger function. 
 Is it an arbitrary "context" variable I can use with any unsigned integer value?
If so, then I have noticed that nrf_swi_flags_t is an alias for uint16_t but the flag argument of nrf_drv_swi_trigger is of uint8_t type. 
 Let me piggyback another question. I am using SD13.2 and the app_timer library. In order for me to use a SWI in my application, is it sufficient to define SWI_DISABLE0 ? If I don't, I get the error: "Symbol SWI0_EGU0_IRQHandler multiply defined (by app_timer.o and nrf_drv_swi.o)". 
 Thank you!

Sigurd · Accepted Answer

Hi, 
 Yes, the flags are arbitrary "context" variable, it allows users to pass extra flags to SWI interrupt handler functions. Looks like nrf_swi_flags_t should have been a uint8_t. Regarding the SWI0_EGU0_IRQHandler symbol error, in SDK 11 app_timer uses SWI0_EGU0_IRQn , but you can change it to use SWI1_EGU1_IRQn instead. You can change this in app_timer.c : 
 #elif defined NRF52
#define SWI_IRQn SWI1_EGU1_IRQn
#define SWI_IRQHandler SWI1_EGU1_IRQHandler
#endif
 
 Regarding SWI_DISABLE0 you can read here that: 
 
 To disable specific SWIs from the
pool, add a global define during
compilation (SWI_DISABLE0 to
SWI_DISABLE5). Any disabled SWI will
not be allocated and will therefore
not be available to the user.

SWI user flags

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