GPIOET interrupt and PPI in S110

Question

Hi，

I want to measure the time of two signals to calculate the speed and sent the data with BLE. I find the SD effect the GPIOTE_interrupt sometimes, when I try to use GPIOTE and timer to calcluate the time . So I use the PPI function, connect the NRF_GPIOTE->EVENTS_IN[ ] to the NRF_TIMER2->TASKS. But the program can not boot up with PPI and GPIOTE_interrupt and SD. I debugged the program. Looks it go to the "System Reset".

If I use PPI and GPIOTE interrupt without BLE SD, it works well. I can measure the time accurately. If I use PPI with SD and disable the interrupt, it works well. If I use the GPIOTE interrupt with SD and disable the PPI, it works well too.

void time1_init(void)  
{

    NRF_TIMER2->MODE        = TIMER_MODE_MODE_Timer;	
    NRF_TIMER2->PRESCALER   = 4;  
    NRF_TIMER2->CC[2]       = (50000U);  
    NRF_TIMER2->INTENSET    = TIMER_INTENSET_COMPARE2_Enabled << TIMER_INTENSET_COMPARE2_Pos;		
    NRF_TIMER2->SHORTS      = (TIMER_SHORTS_COMPARE2_CLEAR_Enabled << TIMER_SHORTS_COMPARE2_CLEAR_Pos);
		NVIC_ClearPendingIRQ(TIMER2_IRQn);			
    NVIC_SetPriority(TIMER2_IRQn,3);				
		NVIC_EnableIRQ(TIMER2_IRQn);  					
	//  NRF_TIMER2->TASKS_START = 1; 
}

 void ppi_init(void)
{
    // Configure PPI channel 0 to start Timer 2 
    NRF_PPI->CH[0].EEP = (uint32_t)(&NRF_GPIOTE->EVENTS_IN[0]);
		NRF_PPI->CH[0].TEP = (uint32_t)(&NRF_TIMER2->TASKS_START);

    // Configure PPI channel 1 to capture Timer2
    NRF_PPI->CH[1].EEP = (uint32_t)(&NRF_GPIOTE->EVENTS_IN[1]);
    NRF_PPI->CH[1].TEP = (uint32_t)(&NRF_TIMER2->TASKS_CAPTURE[0]);

    // Enable only PPI channels 0 and 1.
    NRF_PPI->CHEN = (PPI_CHEN_CH0_Enabled << PPI_CHEN_CH0_Pos) | (PPI_CHEN_CH1_Enabled << PPI_CHEN_CH1_Pos);
}

void EXIT_KEYS_Init(void)
{

		nrf_gpio_cfg_input(S1,GPIO_PIN_CNF_PULL_Pullup);
		nrf_gpio_cfg_input(S2,GPIO_PIN_CNF_PULL_Pullup);
//		NVIC_SetPriority(GPIOTE_IRQn,1);

	
    NRF_GPIOTE->CONFIG[0] =  (GPIOTE_CONFIG_POLARITY_HiToLo << GPIOTE_CONFIG_POLARITY_Pos)	
                           | (S1 << GPIOTE_CONFIG_PSEL_Pos)  																
                           | (GPIOTE_CONFIG_MODE_Event << GPIOTE_CONFIG_MODE_Pos);					
		NRF_GPIOTE->CONFIG[1] =  (GPIOTE_CONFIG_POLARITY_HiToLo << GPIOTE_CONFIG_POLARITY_Pos)
                           | (S2 << GPIOTE_CONFIG_PSEL_Pos)  
                           | (GPIOTE_CONFIG_MODE_Event << GPIOTE_CONFIG_MODE_Pos);

         NVIC_EnableIRQ(GPIOTE_IRQn);   //must disable GPIOTE interrupt or PPI
		NRF_GPIOTE->INTENSET  = GPIOTE_INTENSET_IN0_Set << GPIOTE_INTENSET_IN0_Pos;
		NRF_GPIOTE->INTENSET  = GPIOTE_INTENSET_IN1_Set << GPIOTE_INTENSET_IN1_Pos;
}

int main(void)
{
	
	uint16_t speeds;

	time1_init(); 
	EXIT_KEYS_Init(); 
	ppi_init();
    // Initialize
    leds_init();
    timers_init();
    buttons_init();
    uart_init();
	
    ble_stack_init();
    gap_params_init();
    services_init();
    advertising_init();
    conn_params_init();
    sec_params_init();
    
    simple_uart_putstring(START_STRING);	
    
    advertising_start();
	  LED_Init();
		capture_state=1;

    for (;;)
    {........}
}

I use the example S110 \experimental\ble_app_uart.

SofeDevices: S110 6.0.0

Board: PCA10001

IC: nRF51822 xxaa

Any idea about it?

Linlei · Accepted Answer

I can use PPI with the SDK 10.0. The errors of the time datas were less than 10us, although they were a bit of volatility. But I can not use GPIOTE interrupt with SD. If I set the interrupt of GPIOTE, it can run at first time. After that, it looks the SD clear the interrupt of GPIOTE, I can see the GPIOTE events be on, but it doesn't respond to the interrupt of GPIOTE events.

Linlei · Answer

Ambystomalabs, thank you very much for your answer. Now, I am trying the SD8.0 . I know I use the new SD must match the API. I tested the example program "ble_app_uart", because it is close to that I want. The example program works well on my board.

The APP is very simple. It get the time of signals on the two pins, calculate and send the datas out by Bluetooth and uart. So I don't worry about the bluetooth traffic will effect the measurement. Now I can use the PPI,it can work. And I can set the interrupt of GPIOTE. I add my codes in the GPIOTE_IRQHandle() in the nrf_drv_gpiote.c . Looks, it can work well.

void GPIOTE_IRQHandler(void)
{
    uint32_t status = 0;
    uint32_t input = 0;
    //these are my codes
	if ((NRF_GPIOTE->EVENTS_IN[0] == 1) && (NRF_GPIOTE->INTENSET & GPIOTE_INTENSET_IN0_Msk))
    {
        NRF_GPIOTE->EVENTS_IN[0] = 0; //ÖÐ¶ÏÊÂ¼þÇåÁã.
		if(capture_state==1)
		{
			//	NRF_TIMER2->TASKS_START = 1; 
			//NRF_TIMER2->TASKS_CLEAR = 1; 
		    capture_state=2; 
		}		
	}
		
	if ((NRF_GPIOTE->EVENTS_IN[1] == 1) && (NRF_GPIOTE->INTENSET & GPIOTE_INTENSET_IN1_Msk))
    {
				
        NRF_GPIOTE->EVENTS_IN[1] = 0; //ÖÐ¶ÏÊÂ¼þÇåÁã.
				if(capture_state==2)
				{		
					NRF_TIMER2->TASKS_CAPTURE[0] = 1;
					shoot_flag=1;						
					capture_time= NRF_TIMER2->CC[0];
					nrf_gpio_pin_clear(20);
					lock_time=10; 
					capture_state=3;
					NRF_TIMER2->TASKS_START = 1;					
				}
	//		  NRF_TIMER2->TASKS_STOP = 1;		//Í£Ö¹¶¨Ê±Æ÷
	//		NRF_TIMER2->TASKS_CAPTURE[0] = 1;		//²¶×½ÈÎÎñ
	//		capture_time= NRF_TIMER2->CC[0];		//»ñµÃÊ±¼ä		
	    }
			if(capture_state==3) lock_time=10;
			

    /* collect status of all GPIOTE pin events. Processing is done once all are collected and cleared.*/
    uint32_t i;
   nrf_gpiote_events_t event = NRF_GPIOTE_EVENTS_IN_2;// nrf_gpiote_events_t event = NRF_GPIOTE_EVENTS_IN_0;			//´ÓÊÂ¼þ0¿ªÊ¼
    uint32_t mask = (uint32_t)NRF_GPIOTE_INT_IN2_MASK;//uint32_t mask = (uint32_t)NRF_GPIOTE_INT_IN0_MASK;			//ÖÐ¶Ï0±êÖ¾Î» mask±êÖ¾£¬ÆðÊ¼µÄµØÖ·
    for (i = 2; i < NUMBER_OF_GPIO_TE; i++)//for (i = 2; i < NUMBER_OF_GPIO_TE; i++)						//0-4
   ...............

GPIOET interrupt and PPI in S110

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