Huge problems with RTC1->Counter and S310

[Flemming Jensen]

Hi All,

I am using the nrf51422 and softdevice S310 to send out ANT+ and BT Smart in my project.

I use RTC1->Counter in order to get a timestamp for an interrupt from a hall sensor.

But the there seem to be something strange going on because suddenly i get strange values from the RTC1->Counter register.

If i read the Counter register every second i get the following:

1  00008002
2  0001000E
3  00018002
4  00020005
5  00028002
6  00030005
7  00038002
8  00040008
9  00048004
10  00050006
11  00058002
12  00060005
13  00068002
14  00070005
15  00078002
16  00080003
17  00080014
18  00088002
19  00090005

But look at line 17! Because I am running RTC1 as a 32Khz counter i should see an increment of approx 0x8000 each read.

But suddenly i read a difference of 0x11

I use SEGGER_RTT_printf for the printout

and the following code:

uint32_t timer = NRF_RTC1->COUNTER;

SEGGER_RTT_printf(0, 
	"%d  %04X%04X\n",
	cnt++,
	(uint16_t)(timer >> 16),
	(uint16_t)(timer));

Please help :)