Program is frozen after starting a timer with SoftDevice

Question

Using: nRF52840-QIAA(build code: C0) 1024kB, GCC 8.2.1, Debug build (-O0), Softdevice S140 7.0.1, SDK v16.0.0

Source code:

#include <libraries/timer/app_timer.h>
#include <nrf_gpio.h>
#include <nrf_sdh.h>

#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"

NRF_LOG_INTERNAL_MODULE_REGISTER();

APP_TIMER_DEF(test_timer);

static void log_init() {
    ret_code_t err_code = NRF_LOG_INIT(nullptr);
    APP_ERROR_CHECK(err_code);

    NRF_LOG_DEFAULT_BACKENDS_INIT();
}

static void test_timer_handler(void *p_context) {
    UNUSED_PARAMETER(p_context);

    nrf_gpio_pin_toggle(21);
}

void timer_init() {
    ret_code_t err_code = app_timer_init();
    APP_ERROR_CHECK(err_code);

    err_code = app_timer_create(&test_timer, APP_TIMER_MODE_REPEATED, test_timer_handler);
    APP_ERROR_CHECK(err_code);
}

void timer_start() {
    ret_code_t err_code;

    NRF_LOG_INFO("Before timer start");

    err_code = app_timer_start(test_timer, APP_TIMER_TICKS(2000), nullptr);
    APP_ERROR_CHECK(err_code);

    NRF_LOG_INFO("After timer start");
}

int main() {
    log_init();

    ret_code_t err_code = nrf_sdh_enable_request();
    APP_ERROR_CHECK(err_code);

    timer_init();

    nrf_gpio_cfg_output(21);
    nrf_gpio_pin_toggle(21);

    timer_start();

    // Enter main loop.
    for (;;) {
        err_code = sd_app_evt_wait();
        APP_ERROR_CHECK(err_code);
    }
}

In UART console i see:

<info> app_timer: RTC: initialized.
<info> app: Before timer start

So program freezed/crashed in app_timer_start.

If i connect debugger it shows that program is running, and when i pause is shows that in paused in Handler External Interrupt(17) and has backtrace:

#0  WDT_IRQHandler () at /home/server/Programming/NRF/NRF_SDK/modules/nrfx/mdk/gcc_startup_nrf52840.S:358
No locals.
#1  <signal handler called>
No symbol table info available.
#2  0x00028efe in NVIC_SetPendingIRQ (IRQn=RTC1_IRQn) at /home/server/Programming/NRF/NRF_SDK/components/toolchain/cmsis/include/core_cm4.h:1664
No locals.
#3  0x0002957a in drv_rtc_irq_trigger (p_instance=0x20002ecc <m_rtc_inst>) at /home/server/Programming/NRF/NRF_SDK/components/libraries/timer/drv_rtc.c:333
No locals.
#4  0x00028bd2 in timer_request_proc_trigger () at /home/server/Programming/NRF/NRF_SDK/components/libraries/timer/app_timer2.c:483
No locals.
#5  0x00028c1e in timer_req_schedule (type=TIMER_REQ_START, p_timer=0x20003750 <test_timer_data>) at /home/server/Programming/NRF/NRF_SDK/components/libraries/timer/app_timer2.c:510
        fifo_ctx = {last_tail = {tag = 0, pos = {wr = 0, rd = 0}}}
        p_req = 0x20003578 <m_req_fifo_data>
#6  0x00028d44 in app_timer_start (p_timer=0x20003750 <test_timer_data>, timeout_ticks=32768, p_context=0x0) at /home/server/Programming/NRF/NRF_SDK/components/libraries/timer/app_timer2.c:590
        p_t = 0x20003750 <test_timer_data>
#7  0x0002da58 in timer_start () at /home/server/Programming/NRF/timer_test/main.cpp:39
        err_code = 1342177280
#8  0x0002dae4 in main () at /home/server/Programming/NRF/timer_test/main.cpp:56
        err_code = 0
#9  0x0002728e in _start ()

I'm using modified sdk_config from examples/ble_peripheral/ble_app_template/pca10056/s140/config/, diff:

< #define NRFX_CLOCK_CONFIG_LF_SRC 1
> #define NRFX_CLOCK_CONFIG_LF_SRC 2

< #define CLOCK_CONFIG_LF_SRC 1
> #define CLOCK_CONFIG_LF_SRC 2

< #define NRF_LOG_BACKEND_UART_TX_PIN 6
> #define NRF_LOG_BACKEND_UART_TX_PIN 19

< #define NRF_LOG_DEFERRED 1
> #define NRF_LOG_DEFERRED 0

< #define NRF_SDH_CLOCK_LF_SRC 1
> #define NRF_SDH_CLOCK_LF_SRC 2

Changed LF_SRC because on 1 program was not starting, only on 0 or 2.

Defines used to build:

-DAPP_TIMER_V2
-DAPP_TIMER_V2_RTC1_ENABLED
-DBOARD_CUSTOM
-DCONFIG_GPIO_AS_PINRESET
-DFLOAT_ABI_HARD
-DNRF52840_XXAA
-DNRF_SD_BLE_API_VERSION=7
-DS140
-DSOFTDEVICE_PRESENT
-DAPP_RAM_START=0x20002E78
-DRAM_SIZE=0x3D188
-DDEBUG

Why program is stuck after requesting interrupt ? How can i fix it ?

Vidar Berg · Accepted Answer

Hello, 
 IRQ #17 is for RTC1, so it is a bit strange that the program appears to end up in the WDT handler (IRQn 16) instead. 
 Could you check the *.map file to see if the RTC1_IRQHandler is being included in the drv_rtc.o object, and if it does, please check if this address + thumb bit matches the address at <vector table start> + 0x84.

Program is frozen after starting a timer with SoftDevice

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