how to read data from slave via TWI

[Anisa]

Hi,

I am trying to use GPIOTE_PIN_HANDLER in the master nrf52. What is the correct way to read data from slave?

Slave device is sending data using nrfx_twis_tx_prepare() and in master device, I am trying to receive data like below:

void gpiote_pin_event_handler(nrf_drv_gpiote_pin_t pin, nrf_gpiote_polarity_t action)
{
	if ((pin == INTERRUPT_PIN) && (NRF_GPIOTE_POLARITY_HITOLO)) {

    	uint8_t rx_buf[1];

        err_code = nrfx_twim_rx(&m_twi, ADDR_SLAVE, rx_buf, sizeof(rx_buf));
        APP_ERROR_CHECK(err_code);
    }

I could not receive anything in master as nrfx_twim_rx() does not executes fully.

Is above the correct way to receive data in master device? Or does master first need to transmit buffer to slave and then slave fills that buffer with data?

If any examples exist for this kind of scenario, please provide pointers.

[awneil]

So are you still trying to connect two nRF52s together via I2C - one nRF52 as a Master, the other nRF52 as a Slave?

https://devzone.nordicsemi.com/f/nordic-q-a/49316/twi-communication-between-two-nrf52-device

[Anisa]

yes, Connection between master and slave works and slave device is detected as well. Now trying to use GPIOTE pin handler.

[awneil]

So what does this have to do with TWI?

Your question doesn't make sense!

[Anisa]

Can you tell me how TWIS_EVT_READ_REQ event and TWIS_EVT_WRITE_REQ is called? Does master calls it? 

Nordic SDK documentation is not clear.

[awneil]

We've been through all this before.

See my reply in your original thread:

https://devzone.nordicsemi.com/f/nordic-q-a/49316/twi-communication-between-two-nrf52-device/196292#196292