nrfx timers - unhandled interrupt on CPU0

Question

Hello,

I am trying to use nrfx timers from nrf v2.5.0 and I cam across a weird issue.

As I enable the CC interrupt a CPU fatal error happens:

00> [00:00:00.250,732] <err> os: >>> ZEPHYR FATAL ERROR 1: Unhandled interrupt on CPU 0
00> [00:00:00.250,762] <err> os: Current thread: 0x200089f0 (unknown)
00> [00:00:00.375,823] <err> fatal_error: Resetting system[0m

over and over again.

I tried to add this piece od code

IRQ_CONNECT(TIMER2_IRQn, 0, timer2_interrupt_handler, NULL, 0);

as I found in other posts but this causes the fw to hang on boot and never reach main:

00> *** Booting nRF Connect SDK v2.5.0 ***

I really do not know what is going on.

Thank you.

Here is the code:

static uint32_t old_cap = 0;
static void timer2_interrupt_handler( nrf_timer_event_t event_type, void *p_context )
{
	uint32_t cap = nrfx_timer_capture_get(&m_timer2, NRF_TIMER_CC_CHANNEL0);
	if (cap != old_cap) {
		LOG_INF("cap: %d", cap);
		old_cap = cap;
	}
}


static void init_timer( void )
{
nrfx_err_t err;

nrfx_timer_uninit(&m_timer2);

nrfx_timer_config_t tmr_config = NRFX_TIMER_DEFAULT_CONFIG(1000000);
tmr_config.bit_width = (nrf_timer_bit_width_t)NRF_TIMER_BIT_WIDTH_16;

err = nrfx_timer_init(&m_timer2, &tmr_config, timer2_interrupt_handler);
if (err != NRFX_SUCCESS) {
LOG_INF("nrfx_timer_init error: 0x%08X", err);
}
/*
nrfx_timer_extended_compare(&m_timer2, NRF_TIMER_CC_CHANNEL0, 200, NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK, true);
*/
nrfx_timer_compare(&m_timer2, NRF_TIMER_CC_CHANNEL0, 200, true);

//nrfx_timer_compare_int_enable(&m_timer2, NRF_TIMER_CC_CHANNEL0);

nrfx_timer_enable(&m_timer2);
}

Jørgen Holmefjord · Accepted Answer

Hi, 
 I tried to add this piece od code 
 
 Fullscreen 1 IRQ_CONNECT(TIMER2_IRQn, 0, timer2_interrupt_handler, NULL, 0); XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX IRQ_CONNECT(TIMER2_IRQn, 0, timer2_interrupt_handler, NULL, 0); 
 
 Since you are using the nrfx timer driver, you should connect the interrupt to the interrupt handler defined in the nrfx driver, not to the event handler in your application. The interrupt handler in the driver will check/clear the events from the peripheral and pass appropriate events to your application event handler when needed. 
 Either use the macro as shown in nrfx_timer sample in upstream Zephyr , or write out the name like it is done in the nrfx sample in Zephyr . 
 Best regards, Jørgen

nrfx timers - unhandled interrupt on CPU0

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