twi_handler doent work after wake up

Are you calling read_sensor_Vibrometer from the NFC interrupt handler? If so, which interrupt priority have you given to the TWI and NFC peripheral when you initialized them? It could sound like there is an issue with interrupt priorities. You could try to lower the NFC IRQ priority.

Hi bjorn

Thanks for your answer

No I dont Calling read_sensor_Vibrometer from NFC handler..

the main is the follow.

int main(void)
{   twi_init();  
    LIS3DH_Turn_on();
    LIS3DH_Temperature();
    ciclomedicion();
    while (true)
    {
      Prepare_NFC_Wake_up(); // here if i enable NFC dindt affect in the ciclomedicion()
      ciclomedicion();
    
      if (m_system_off_mode_on)
        {
         NRF_LOG_INFO(" system go to SLEEP MODE \r\n .");
         NRF_LOG_FLUSH();
         nrf_delay_ms(1000);
         NRF_LOG_INFO("sleep on \r\n .");
         NRF_LOG_FLUSH();
     
         m_system_off_mode_on = false;
         Prepare_NFC_Wake_up(); // here is the original place to activate NFC
                  
         while (true) 
         
         { __WFE();  } 
    }    
}         

And the Function Of NFC are the following

static void Prepare_NFC_Wake_up(void)
{             
          //Enable interrupt for FIELDDETECT Event
          NRF_NFCT->INTENSET = NFCT_INTENSET_FIELDDETECTED_Enabled << NFCT_INTENSET_FIELDDETECTED_Pos;
        
          // Setting Grouping priority 
          //NVIC_SetPriorityGrouping(1);
          
          //Register interrupt for NFCT module
          NVIC_EnableIRQ(NFCT_IRQn);  //  NFCT_IRQn
      
          //Start sensing 
          NRF_NFCT->TASKS_SENSE = 1;
               
}
 
static void Prepare_NFC_Turn_off(void)
{             
          //Enable interrupt for FIELDDETECT Event
          //NRF_NFCT->INTENSET = NFCT_INTENSET_FIELDDETECTED_Enabled << NFCT_INTENSET_FIELDDETECTED_Pos;
    
          //Register interrupt for NFCT module
          NVIC_DisableIRQ(NFCT_IRQn);  //  NFCT_IRQn
      
          //Start sensing 
          NRF_NFCT->TASKS_SENSE = 0;
}

// This IRQ handler will trigger when NFC field is detected
void NFCT_IRQHandler(void)
{
  if (NRF_NFCT->EVENTS_FIELDDETECTED == 1)
  {
    Prepare_NFC_Turn_off();
    NRF_NFCT->EVENTS_FIELDDETECTED = 0;

    NRF_LOG_INFO(" ***************  TURN ON BY NFC  ***************\r\n");
    NRF_LOG_FLUSH();
    
    ciclomedicion();
    
    Prepare_NFC_Wake_up();
  }
}

the function ciclomedicion() is a routine take measure accelerometer and temperature. Both works well even when NFC is turn ON (prepare_NFC_wake_up)

as I can realized the problem is the __WFE it routine doing something with the handler.(handler of TWI or handler of NRF_LOG_FLUSH)

when I turn on with NFC, the routine NFCT_IRQHandler  is start.

I added the following code to check the start again of the program..

NRF_LOG_INFO(" *************** TURN ON BY NFC ***************\r\n");
NRF_LOG_FLUSH();

but the program is stuck here in the while cycle

static void serial_tx(void const * p_context, char const * p_buffer, size_t len)
{
    uint8_t len8 = (uint8_t)(len & 0x000000FF);
    m_xfer_done = false;
    ret_code_t err_code = nrf_drv_uart_tx(&m_uart, (uint8_t *)p_buffer, len8);
    APP_ERROR_CHECK(err_code);
    /* wait for completion since buffer is reused*/
    while (m_async_mode && (m_xfer_done == false))  **** HERE THE PROGRAM STUCK ****
    {

    }

}

if I erased the 

NRF_LOG_INFO(" *************** TURN ON BY NFC ***************\r\n");
NRF_LOG_FLUSH();

the program Stuck in the  while cycle of the read_sensor_Vibrometer...  (read_sensor_Vibrometer is inside of ciclomedicion()

I hope you have all the information...

thanks in advance..

Ricardo

HI.

I add the Twi_ini

void twi_init (void)
{
    ret_code_t err_code;

    const nrf_drv_twi_config_t twi_lm75b_config = {
       .scl                = ARDUINO_SCL_PIN,
       .sda                = ARDUINO_SDA_PIN,
       .frequency          = NRF_DRV_TWI_FREQ_100K,   
       .interrupt_priority = APP_IRQ_PRIORITY_HIGH,
       .clear_bus_init     = false
    };

    err_code = nrf_drv_twi_init(&m_twi, &twi_lm75b_config, twi_handler, NULL); // 
    APP_ERROR_CHECK(err_code);

    nrf_drv_twi_enable(&m_twi);

    
}

thanks

Ok, but you are calling ciclomedicion() in the interrupt handler of the NFC peripheral, so if the NFC IRQ handler has the same priority as the TWI handler, which sets the m_xfer_done flag, then you will never enter the  TWI handler. 

So you can try to set the priority of the NFC IRQ handler lower than the TWI IRQ handler by calling

NVIC_SetPriority(5, 3);

in Prepare_NFC_Wake_up.

HI bjorn

Thanks for your advice, you are right,  the problem is the priority..

I added :

1.- NVIC_SetPriority(NFCT_IRQn, 5); but i have to changed the priotity of the UART

2.- #define UART_DEFAULT_CONFIG_IRQ_PRIORITY 6  // Change from 7 to 6

with both the program doesnt stuck in 

NRF_LOG_FLUSH();

or getting the values from accelerometer (twi)..

and it Works the NFC with rtc event for wakeup...

Thanks