lfclk, rtc issue on SDK13

[fteng]

I am trying to set up RTC2 by following an example github.com/.../saadc_low_power I ported it to my project which is running a softdevice on nRF52. It works perfectly fine on SDK11 but has problems on SDK13.0 / 13.1. Seems like nrf_drv_clock_init() or nrf_drv_rtc_init() has conflict with the BLE stack. Any idea what has changed from SDK11 to SDK13?

[pirm]

I have the same problem with SDK 14.1. If I initialize CLOCK and RTC driver before BLE stack I have an error in return of nrf_sdh_enable_request():

<error> app: ERROR 4097 [Unknown error code] 

If I initialize BLE stack first, I can initialize CLOCK (nrf_drv_clock_init()) but RTC initialization fails (nrf_drv_rtc_init()) with the error:

<error> app: SOFTDEVICE: INVALID MEMORY ACCESS

RTC section of sdk_config.h:

// <e> RTC_ENABLED - nrf_drv_rtc - RTC peripheral driver
//==========================================================
#ifndef RTC_ENABLED
#define RTC_ENABLED 1
#endif
// <o> RTC_DEFAULT_CONFIG_FREQUENCY - Frequency  <16-32768> 


#ifndef RTC_DEFAULT_CONFIG_FREQUENCY
#define RTC_DEFAULT_CONFIG_FREQUENCY 32768
#endif

// <q> RTC_DEFAULT_CONFIG_RELIABLE  - Ensures safe compare event triggering
 

#ifndef RTC_DEFAULT_CONFIG_RELIABLE
#define RTC_DEFAULT_CONFIG_RELIABLE 0
#endif

// <o> RTC_DEFAULT_CONFIG_IRQ_PRIORITY  - Interrupt priority
 

// <i> Priorities 0,2 (nRF51) and 0,1,4,5 (nRF52) are reserved for SoftDevice
// <0=> 0 (highest) 
// <1=> 1 
// <2=> 2 
// <3=> 3 
// <4=> 4 
// <5=> 5 
// <6=> 6 
// <7=> 7 

#ifndef RTC_DEFAULT_CONFIG_IRQ_PRIORITY
#define RTC_DEFAULT_CONFIG_IRQ_PRIORITY 7
#endif

// <q> RTC0_ENABLED  - Enable RTC0 instance
 

#ifndef RTC0_ENABLED
#define RTC0_ENABLED 0
#endif

// <q> RTC1_ENABLED  - Enable RTC1 instance
 

#ifndef RTC1_ENABLED
#define RTC1_ENABLED 0
#endif

// <q> RTC2_ENABLED  - Enable RTC2 instance
 

#ifndef RTC2_ENABLED
#define RTC2_ENABLED 1
#endif

// <o> NRF_MAXIMUM_LATENCY_US - Maximum possible time[us] in highest priority interrupt 
#ifndef NRF_MAXIMUM_LATENCY_US
#define NRF_MAXIMUM_LATENCY_US 2000
#endif

[Jørgen Holmefjord]

Error 4097 (0x1001) corresponds to NRF_ERROR_SDM_INCORRECT_INTERRUPT_CONFIGURATION. The second error (INVALID MEMORY ACCESS) indicates that the function is accessing a peripheral restricted or blocked by the softdevice, without using the softdevice API. Can you upload the project for review of the code and debugging?

[pirm]

Thank you for your answer. While trying to purge my code to send the project, I found my mistake: I was declaring an instance of the RTC that was different from wich declared in sdk_config.h : const nrf_drv_rtc_t rtc = NRF_DRV_RTC_INSTANCE(0); /**< Declaring an instance of nrf_drv_rtc for RTC0. */

I change to RTC2 and it works. It was an heritage from previous work with SDK11 and nRF51822 board.