Question about stopping all the timers that are used in the application.

[Rajat]

Hi Everyone

I have got 3 timers in my application. 

1 is repeated , and other two are Single shot which are ran from the inputs to the 1st Repeated timer.

The repeated keeps checking the UART for a byte , once the byte is received , One single shot timer is started , which on expiry turn One of my sensor OFF and inside the handler starts another single shot timer which again turns ON the sensor after 1 hour. 

If i stop the repeated timer when i turn OFF the Sensor , and start the Timer when I turn ON the sensor again. The whole thing just comes to a halt and it doesn't work anymore.

I have fixed this issue by using a timer of 10 seconds , which does literally nothing but keep repeating after 10 seconds, but i am not sure if the theory is correct or not.

""If all the timers have been turned OFF , the RTC goes to deep-sleep and it doesn't count anymore and to keep the RTC alive , i have used a repeated timer as desribed above.

It works in this configuration , but i am not sure if the reasoning is correct or not.""

Kindly help me understand this behavior.

Thanks 

Rajat

[Edvin]

I don't need to reproduce, but it is easier to navigate in your project to see what you are doing if I have the project. Your APP_TIMER_CONFIG_RTX_FREQUENCY is 0, meaning your app_timer is running on 32768Hz. 

Where do you set your prescaler to 15?

[Rajat]

Fullscreen timer_interra.c Download

/** @file timer_interra.c
*
* @brief A Timer used to generate the delay functionality, will later try to execute events.
*
* @par
* NOTICE: Property of in-Terra Limited www.in-terra.ch .
*/


#include "timer_interra.h"

APP_TIMER_DEF(m_led_0_timer_id);

uint8_t timer_exp_flag=0;

void timer_0_handler(void * p_context)
{ 
    timer_exp_flag=1; 
    
       
}


/*!
 * @brief Delay using the app timer
 *
 * @param[in] None
 *
 * @return    None
 */

uint8_t delay()
{

    if (timer_exp_flag == 1)
        {
            timer_exp_flag = 0;

            return 1;
        }
    else
        {   
            return 0;
        }
}


/*!
 * @brief Delay using the app timer
 *
 * @param[in] None
 *
 * @return    None
 */

uint8_t timer_ms(uint32_t time_miliseconds)
{

uint32_t err_code;
 
    err_code = app_timer_create(&m_led_0_timer_id,
                                APP_TIMER_MODE_SINGLE_SHOT,
                                timer_0_handler);
    APP_ERROR_CHECK(err_code);

    // Start timers
    err_code =app_timer_start(m_led_0_timer_id, APP_TIMER_TICKS(time_miliseconds), NULL);
    APP_ERROR_CHECK(err_code);
    
  while(delay()!=1);

 // while(timer_exp_flag!=1);
}




/*!
 * @brief Initilaize the Timer
 *
 * @param[in] None
 *
 * @return    None
 */

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

 SEGGER_RTT_printf(0,"Error Code is %ld\r\n", err_code);      
   
}

/*!
 * @brief start the Timer
 *
 * @param[in] milsecond to expire
 *
 * @return    None
 */

void
timer_start(uint32_t ms_time)
{
    

        
   
}

timer_interra.h

[Rajat]

Inside timer_interra.h , i have defined

#define APP_TIMER_PRESCALER             15 

[Rajat]

APP_TIMER_CONFIG_RTC_FREQUENCY 0

or is it this value that decides everything ahead in the software?

I am confused. :(

[Rajat]

i am not able to upload the whole project , it says Error when i upload the zip file.