i2c and low power

[lyrics]

Hi, all

I'm trying to i2c(twi) in low power..

while(true) {
    __WFE();
    __SEV();
    __WFE();
}

In this case, I want to generate an interrupt through the i2c read function " read_touch_data " (under code).

void read_touch_data(void) 
{
    m_xfer_done = false;

    /* Read 1 byte from the specified address - skip 3 bits dedicated for fractional part of temperature. */
    ret_code_t err_code = nrf_drv_twi_rx(&m_tch_twi, TOUCH_ADDR, &m_touch_value, 2);
    APP_ERROR_CHECK(err_code);
}

Where should I define the "read_touch_data" function to generate an interrupt in low power state?

I originally used do-while statements, but I don't think this is an interrupt, so I ask you a question. Thank you.

do {
  read_touch_data();
  nrf_delay_ms(1000);

  idle_state_handle();

} while(!m_touch_value[1]);  

[Heidi]

Hi!

You want an interrupt that will trigger when the device goes into a low power state, is that correct? I'm not sure that's possible but I will find out and get back to you.

Due to the Easter holidays here in Norway, you can expect an answer on Tuesday 6. april, at the earliest. 

Best regards,

Heidi

[Heidi]

Hi again!

The TWI driver in the nRF5 SDK will enable interrupts for the necessary events if it is configured in non-blocking mode. 

The delay (nrf_delay_ms(1000)) will prevent the CPU from entering sleep for 1000 ms, which means that the TWI transfer will be done long before sleep is entered. The peripheral will still generate the interrupt in non-blocking mode though.