I wrote this code found in an example and it works fine:
#include "nrf_drv_config.h"
#include "nrf_drv_timer.h"
//Before I activated TIMER0, TIMER1 and TIMER2 in nrf_drv_config.h
const nrf_drv_timer_t TIMER_LED = NRF_DRV_TIMER_INSTANCE(0);
/**
* @brief Handler for timer events.
*/
void timer_led_event_handler(nrf_timer_event_t event_type, void* p_context)
{
switch(event_type)
{
case NRF_TIMER_EVENT_COMPARE0:
LED_redLed_toggle();
break;
default:
//Do nothing.
break;
}
}
int main(void)
{
LED_init();
uint32_t time_ms = 3000; //Time(in miliseconds) between consecutive compare events.
uint32_t time_ticks;
uint32_t err_code = NRF_SUCCESS;
err_code = nrf_drv_timer_init(&TIMER_LED, NULL, timer_led_event_handler);
APP_ERROR_CHECK(err_code);
time_ticks = nrf_drv_timer_ms_to_ticks(&TIMER_LED, time_ms);
nrf_drv_timer_extended_compare( &TIMER_LED,
NRF_TIMER_CC_CHANNEL0,
time_ticks,
NRF_TIMER_SHORT_COMPARE0_CLEAR_MASK,
true);
nrf_drv_timer_enable(&TIMER_LED);
//ANT_init();
//BLE_init();
// Main Loop
while(1)
{
PWR_sleep();
}
}
When I active the softdevice, removing comments at these lines:
//ANT_init();
//BLE_init();
The code doesn't run. I found that TIMER0 is used by softdevice, so I tried to use TIMER1 or TIMER2 changing this line:
const nrf_drv_timer_t TIMER_LED = NRF_DRV_TIMER_INSTANCE(0);
into:
const nrf_drv_timer_t TIMER_LED = NRF_DRV_TIMER_INSTANCE(1);
and then also into:
const nrf_drv_timer_t TIMER_LED = NRF_DRV_TIMER_INSTANCE(2);
In both cases the interrupt will be continuous, and not after the setted time.
What does could be the issue?
I found on this forum a similar question, but I tried to reduce the timer frequency and I get that I can set the timer untill 2s, but over 2s the timer restart to interrupt continuously. The settings I modified are:
#define TIMER2_ENABLED 1
#if (TIMER2_ENABLED == 1)
#define TIMER2_CONFIG_FREQUENCY NRF_TIMER_FREQ_31250Hz
#define TIMER2_CONFIG_MODE TIMER_MODE_MODE_Timer
#define TIMER2_CONFIG_BIT_WIDTH TIMER_BITMODE_BITMODE_32Bit
#define TIMER2_CONFIG_IRQ_PRIORITY APP_IRQ_PRIORITY_LOW
#define TIMER2_INSTANCE_INDEX (TIMER1_ENABLED+TIMER0_ENABLED)
How can I use the timer to have interrupts every 5 minuts ?
It seems like the TIMER_BITMODE_BITMODE_32Bit doens't set correclty the register behaviour as a 32bit register, but remains at 16bit so, setting timer times bigger than 2seconds make the interrupts arriving continuously.
I need a timer which can interrupt every 5 minuts or more to wakup the application which I put in sleep with sd_app_wait(); (PWR_sleep(); in my code).
How can I reach this?
Thanks.
