there is interference in pins used as output when I use BLE ???

[CesarBV]

Hello,

I am using a nrf51422 development kit with softdevice S310 and I have a problem in whatever pin I choose as output when I use the bluetooth.

I run the example ble_app_hts for nrf51822 but conditioned to be flashed in nrf51422. In this example, it is implemented a health thermometer profile and it works fine, but I've added to this code a little code to generate a clock signal and to send it to an output pin. The clock pulse works fine when I eliminate the "advertising_start()" line, but I can not connect with bluetooth when I eliminate it, obviously. But when advertising_start() is running, the clock pulse doesn't work fine, some times it stays high or low more time than needed.

So, someone can tell me why when bluetooth is working, there is interference in the output signal??? my code is the next:

---

int main(void)

{

// Initialize.
leds_init();
timers_init();
gpiote_init();
buttons_init();

ble_stack_init();
bond_manager_init();
gap_params_init();

advertising_init();
services_init();

sensor_sim_init();
conn_params_init();
sec_params_init();

// Start execution.
application_timers_start();
advertising_start();

// Enter main loop.
int contador=1;
for (;;)
{
    //power_manage();
		
		if (contador%2==1)
		{
			nrf_gpio_cfg_output(SALIDA);
			nrf_gpio_pin_set(SALIDA);
		}
		else
		{
			nrf_gpio_cfg_output(SALIDA);
			nrf_gpio_pin_clear(SALIDA);
		}
		contador++;
}

}

[Nikita]

You can know when softdevice will take over cpu time with radio notification event devzone.nordicsemi.com/.../ and don't update LCD if you don't have enough time to perform LCD update.

[CesarBV]

I've decided to use a PWM generated with timer interrupts to generate the signal I need for LCD. To do this I have modified the example "pwm_example" (eliminating the part of reading buttons) and added to my code above. But now doesn't work nothing, I have no signal in no any pin. So my question is the next, is there a problem between the configuration of the timers??? because I need one timer for pwm and BLE needs one timer too...

This is my code for the timers configuration

For timer used by BLE

#define APP_TIMER_PRESCALER 0 /< Value of the RTC1 PRESCALER register. */ #define APP_TIMER_MAX_TIMERS 2 /< Maximum number of simultaneously created timers. */ #define APP_TIMER_OP_QUEUE_SIZE 4 /**< Size of timer operation queues. */

static void timers_init(void) { // Initialize timer module, making it use the scheduler APP_TIMER_INIT(APP_TIMER_PRESCALER, APP_TIMER_MAX_TIMERS, APP_TIMER_OP_QUEUE_SIZE, true);

}

[CesarBV]

and this is my code for timer to generate pwm

//Define para TIMER

#define PWM_OUTPUT_PIN_NUMBER (25)

#define MAX_SAMPLE_LEVELS (256UL) /< Maximum number of sample levels. */ #define TIMER_PRESCALERS 6U /< Prescaler setting for timer. */ #define GPIOTE_CHANNEL_NUMBER_2 1

///// TIMER /////

static __INLINE uint32_t next_sample_get(void) { static uint32_t sample_value = 8;

// Read button input.
sample_value = ((/*nrf_gpio_port_read(NRF_GPIO_PORT_SELECT_PORT0)*/0x000000BF) & 0x000000FFUL); // valor del ciclo de trabajo

// This is to avoid having two CC events happen at the same time,
// CC1 will always create an event on 0 so CC0 and CC2 should not.
if (sample_value == 0) 
{
    sample_value = 8;
}

return (uint32_t)sample_value;

}

/** @brief Function for handling timer 2 peripheral interrupts. */ void TIMER2_IRQHandler(void) { static bool cc0_turn = false; /**< Keeps track of which CC register to be used. */

if ((NRF_TIMER2->EVENTS_COMPARE[1] != 0) && 
   ((NRF_TIMER2->INTENSET & TIMER_INTENSET_COMPARE1_Msk) != 0))
{
    // Sets the next CC1 value
    NRF_TIMER2->EVENTS_COMPARE[1] = 0;
    NRF_TIMER2->CC[1]             = (NRF_TIMER2->CC[1] + MAX_SAMPLE_LEVELS);

    // Every other interrupt CC0 and CC2 will be set to their next values.
    uint32_t next_sample = next_sample_get();

    if (cc0_turn)
    {
        NRF_TIMER2->CC[0] = NRF_TIMER2->CC[1] + next_sample;
    }
    else
    {
        NRF_TIMER2->CC[2] = NRF_TIMER2->CC[1] + next_sample;
    }
    // Next turn the other CC will get its value.
    cc0_turn = !cc0_turn;
}

}

/** @brief Function for initializing the Timer 2 peripheral. */ static void timer2_init(void) { // Start 16 MHz crystal oscillator . NRF_CLOCK->EVENTS_HFCLKSTARTED = 0; NRF_CLOCK->TASKS_HFCLKSTART = 1;

// Wait for the external oscillator to start up.
while (NRF_CLOCK->EVENTS_HFCLKSTARTED == 0) 
{
    //Do nothing.
}

NRF_TIMER2->MODE        = TIMER_MODE_MODE_Timer;
NRF_TIMER2->BITMODE     = TIMER_BITMODE_BITMODE_16Bit << TIMER_BITMODE_BITMODE_Pos;
NRF_TIMER2->PRESCALER   = TIMER_PRESCALERS;

// Clears the timer, sets it to 0.
NRF_TIMER2->TASKS_CLEAR = 1;

// Load the initial values to TIMER2 CC registers.
NRF_TIMER2->CC[0] = MAX_SAMPLE_LEVELS + next_sample_get();
NRF_TIMER2->CC[1] = MAX_SAMPLE_LEVELS;

// CC2 will be set on the first CC1 interrupt.
NRF_TIMER2->CC[2] = 0;

// Interrupt setup.
NRF_TIMER2->INTENSET = (TIMER_INTENSET_COMPARE1_Enabled << TIMER_INTENSET_COMPARE1_Pos);

} ///// TIMER /////