alternate for nrf_delay_ms

[manikandan]

hello,

i am using nrf52832 with lis3dh accelarometer and max30205 temperature sensor in our customised board with sdk 15.2 in my driver for temperature sensor i am using delay function

i need any alternate for delay function which consumes less current 

while (m_xfer_done == false)
;
nrf_delay_ms(5);// in this line i have to wait for 5 ms 

thanks and regards

manikanadan v

[Susheel Nuguru]

You could use a single shot app timer to configure as delay with timer that can make your system go to sleep while sleeping instead of busy while looping.

App timer documentation can be found here

[manikandan]

hello,

i am doing something like this but that does not seems to be working

static void delay_timeout_handler(void *p_context) {

//what should i put here

}

void MAX_temp_mode(void) {

while (m_xfer_done == false)
;

app_timer_stop(timer_for_delay);
err_code = app_timer_start(timer_for_delay, APP_TIMER_TICKS(5), NULL);
//what should i put here

}

thanks and regards 

manikandan v

[Susheel Nuguru]

There are similar requests in the devzone like this one.. That should help you to atleast show the logic of how to use a one shot delay using app_timer

[manikandan]

hello,  

i already know how to use an app timer 

static volatile bool m_le_delay_flag = false;

err_code = app_timer_create(&m_delay, APP_TIMER_MODE_SINGLE_SHOT, timer_evt_Delay);
APP_ERROR_CHECK(err_code);

static void power_manage(void) {
uint32_t err_code = sd_app_evt_wait();
APP_ERROR_CHECK(err_code);
}

/** function for calling low power delay */
uint8_t nrf_delay_ms_app(int ms_delay) {

uint32_t err_code;
err_code = app_timer_start(m_delay, APP_TIMER_TICKS(ms_delay), NULL);
APP_ERROR_CHECK(err_code);
m_delay_flag = true;
while (m_delay_flag) {
power_manage();
}
return 0;
}

static void timer_evt_Delay(void *p_context) {

printf("delay\n");
m_delay_flag = false;
}

but when i call  nrf_delay_ms_app(10); in my application my program get alted in  bove while loop do you happen to know the reason befind this (note :i am calling this function inside an another app timer handler ) kindly check and tell me how can i rectify this

thanks and regards

manikandan v

[Susheel Nuguru]

you cant call this function from another timer handler since the timer handler is called from RTC interrupt handler and you should not be waiting in a while loop in those handlers. The fundemental idea of you trying to create delay in timer callback handler in itself is not correct.