Help me understand the "DRV_RTC_INSTANCE" macro

[doryhealth]

I am reading through the code and would like to understand the following macro

#define DRV_RTC_INSTANCE(id) \
{ \
.p_reg = NRFX_CONCAT_2(NRF_RTC, id), \
.irq = NRFX_CONCAT_3(RTC, id, _IRQn), \
.instance_id = NRFX_CONCAT_3(DRV_RTC_RTC, id, _INST_IDX), \
.cc_channel_count = NRF_RTC_CC_CHANNEL_COUNT(id), \
}

In particular, I don't understand where/how for instance NRF_RTC is declared as there are no other mentions of it in the code.
Or is it simply a concatenation of strings resulting in NRF_RTC1, in this case?

Thank you, in advance, for your time & help.
Jerome

[Einar Thorsrud]

Hi Jerome,

Or is it simply a concatenation of strings resulting in NRF_RTC1, in this case?

Yes, that is what it is. So in this case you get:

• .p_reg = NRF_RTC1
• .irq = RTC1_IRQn
• .instance_id = DRV_RTC_RTC1_INST_IDX
• .cc_channel_count = RTC1_CC_NUM = 4

Einar

[doryhealth]

Thank you Einar.