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nRF9160 > Count pulse on GPIO

Dear Team,

what is the way to do it in Zephyr? 

I have a signal up-to 10kHz, what is the best way to keep the counter in the background?

Thank you and best

Oleh

Parents Reply
  • Almost.

    In addition to

    PERPIH("NRF_DPPI", NRF_DPPIC_NS, CONFIG_SPM_NRF_DPPIC_NS),
    in spm.c:304 and

    if (IS_ENABLED(CONFIG_SPM_NRF_GPIOTE1_NS)) {
        NRF_SPU->DPPI[0].PERM = 0;
    }
    in spm.c:326

    I also had to add

    PERIPH("NRF_RTC0", NRF_RTC0, CONFIG_SPM_NRF_RTC0_NS),
    in spm.c:305,

    config SPM_NRF_DPPIC_NS
    	bool "DPPI is Non-Secure"
    	default y
    
    config SPM_NRF_RTC0_NS
    	bool "RTC0 is Non-Secure"
    	default y
    in ncs/nrf/subsys/spm/Kconfig:180, and

    CONFIG_PPI_TRACE_PIN_RTC_COMPARE_EVT=10
    CONFIG_PPI_TRACE_PIN_RTC_TICK_EVT=11
    CONFIG_PPI_TRACE_PIN_LFCLOCK_STARTED_EVT=12
    in prj.conf

Children
  • Hi Didrik, thanks! that was to make the ppi_trace to work. 

    could you please help on wiring Counter and Timer to get it with DPPI as here: https://devzone.nordicsemi.com/f/nordic-q-a/9036/measuring-input-gpio-pin-frequency-with-soft-device-running ?

  • am I on the right way?

    static void timer_init()
    {
     NRF_TIMER1_NS->TASKS_STOP = 1;
     NRF_TIMER1_NS->MODE = TIMER_MODE_MODE_Timer;
     NRF_TIMER1_NS->PRESCALER = 8; // Fhck / 2^8 
     NRF_TIMER1_NS->CC[0] = 62500; // 62500 - 1s
     
     NRF_TIMER1_NS->BITMODE = (TIMER_BITMODE_BITMODE_16Bit << TIMER_BITMODE_BITMODE_Pos); 
     
     NRF_TIMER1_NS->TASKS_CLEAR = 1;
     NRF_TIMER1_NS->INTENSET = (TIMER_INTENSET_COMPARE0_Enabled << TIMER_INTENSET_COMPARE0_Pos);
     
     NRF_TIMER1_NS->EVENTS_COMPARE[0] = 0;
    }
    
    static void counter_init()
    {
     NRF_TIMER2_NS->TASKS_STOP = 1; 
     NRF_TIMER2_NS->MODE = TIMER_MODE_MODE_Counter;
     NRF_TIMER2_NS->BITMODE = (TIMER_BITMODE_BITMODE_24Bit << TIMER_BITMODE_BITMODE_Pos);
     NRF_TIMER2_NS->TASKS_CLEAR = 1;
     NRF_TIMER2_NS->EVENTS_COMPARE[0] = 0;
    }
    
    #define SENSE_PIN 13
    static void gpiote_init(uint32_t pin)
    {
     NRF_GPIOTE1_NS->CONFIG[0]  =  0x01 << 0;         // MODE: Event
     NRF_GPIOTE1_NS->CONFIG[0]  |=  SENSE_PIN << 8;       // Pin number
     NRF_GPIOTE1_NS->CONFIG[0]  |=  NRF_GPIOTE_POLARITY_LOTOHI << 16;  // Event rising edge  
    }
    
    static void ppi_timer_stop_counter_init()
    {
     //NRF_DPPIC_NS->CHEN |= 1 << 0;
     //*(&(NRF_DPPIC_NS->CH0_EEP)) = (uint32_t)&NRF_TIMER1_NS->EVENTS_COMPARE[0];
     //*(&(NRF_DPPIC_NS->CH0_TEP)) = (uint32_t)&NRF_TIMER2_NS->TASKS_STOP;
     //NRF_DPPIC_NS->CHENSET |= 1 << 0;
     
     #define EVT_IX_TIMER1__COMPARE 1
     #define TSK_IX_TIMER2__STOP_COUNTER 1
        // Configure GPIOTE Index 0 to be an Event -> 
        nrf_gpiote_event_configure(EVT_IX_TIMER1__COMPARE, nrf_timer_event_address_get(NRF_TIMER1_NS, NRF_TIMER_EVENT_COMPARE_1) ...);
        // Configure GPIOTE Index 1 to be a Task -> 
        nrf_gpiote_task_configure(TSK_IX_TIMER2__STOP_COUNTER, nrf_timer_event_address_get(NRF_TIMER2_NS, NRF_TIMER_TASK_COUNT) ...);
        // Index 0 will Publish on DPPI Channel 0 
        nrf_gpiote_publish_set(NRF_GPIOTE_EVENTS_IN_0, DPPI_CHANNEL);
        // Index 1 will Subscribe on DPPI Channel 0 
        nrf_gpiote_subscribe_set(NRF_GPIOTE_TASKS_OUT_1, DPPI_CHANNEL);
        // Enable Publish and Subscribe 
        nrf_gpiote_event_enable(EVT_IX_TIMER1__COMPARE);
        nrf_gpiote_task_enable(TSK_IX_TIMER2__STOP_COUNTER);
        // Enable DPPI Channel 
        nrf_dppi_channels_enable(NRF_DPPIC, DPPI_BIT_SET(DPPI_CHANNEL));
    }
    
    static void ppi_gpiote_counter_init()
    {
     NRF_DPPIC_NS->CHEN |= 1 << 1;
     *(&(NRF_DPPIC_NS->CH1_EEP)) = (uint32_t)&NRF_GPIOTE1_NS->EVENTS_IN[0];
     *(&(NRF_DPPIC_NS->CH1_TEP)) = (uint32_t)&NRF_TIMER2_NS->TASKS_COUNT;
     NRF_DPPIC_NS->CHENSET |= 1 << 1;
    }

  • Hi, and apologies for the late answer.

    I believe that most of the code you posted should work, but especially the parts concerning PPI would not work due to differences between PPI and DPPI.

    I was able to port an example written by  for another case. The sample is made to measure much higher frequencies than what you have, so you might want to edit some of the timer configurations in main().

    dppi_frequency.zip

    To make the sample compile, you must also add

    #define GPIOTE_IRQn GPIOTE0_IRQn

    in ncs/zephyr/ext/hal/nordic/nrfx_config_nrf9160.h, on line 200.

    Also, you must configure the DPPI peripheral as non-secure as done in a previous comment.

    A pre-compiled hex file is included for your convenience.

    Best regards,

    Didrik

  • thank you, now I am trying to make it working on the latest ncs git... but getting errors...

     is there anything I have to change?

    ***** Booting Zephyr OS build v1.14.99-ncs3-snapshot2-2647-gd6e67554cfeb *****
    starting application...
    starting init gpiote...
    prepare time 1 cfg...
    uninit time 1...
    init time 1...
    prepare time 2 cfg...
    uninit time 2...
    init time 2...
    nrfx_timer_ms_to_ticks...
    nrfx_timer_extended_compare...
    gpiote_setup...
    gpiote_setup...
    gpiote_evt_addr: 0x5000d100
    NRF_GPIOTE_EVENTS_IN_0: 0x00000100
    NRF_GPIOTE1_NS: 0x40031000
    gpiote_evt_addr - NRF_GPIOTE0_S: 0x0ffdc100
    [00:00:00.069,274] <err> os: ***** BUS FAULT *****
    [00:00:00.069,274] <err> os:   Precise data bus error
    [00:00:00.069,274] <err> os:   BFAR Address: 0x40010088
    [00:00:00.069,305] <err> os: r0/a1:  0x00000000  r1/a2:  0x00000001  r2/a3:  0x80000000
    [00:00:00.069,305] <err> os: r3/a4:  0x40010088 r12/ip:  0x00000030 r14/lr:  0x0000061f
    [00:00:00.069,305] <err> os:  xpsr:  0x29000000
    [00:00:00.069,305] <err> os: Faulting instruction address (r15/pc): 0x00000632
    [00:00:00.069,335] <err> os: >>> ZEPHYR FATAL ERROR 0: CPU exception
    [00:00:00.069,335] <err> os: Current thread: 0x20000274 (unknown)
    [00:00:00.140,075] <err> os: Halting system

  • Hi.

    A pull request for a sample demonstrating how to use the nrfx drivers in Zephyr was just opened.

    Hopefully, it is able to help you.

    https://github.com/zephyrproject-rtos/zephyr/pull/20089/files

    Best regards,

    Didrik

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