TWI communication

[Vibhu]

Hi Guys,

I am using Si7021 I2C temperature sensor and I want to read the temperature value using nrf52840-DK. I connected the sensor to the 27,26 pin. 

I wanted to read the sensor value. 

Here is the initialization

Here is the read function,

I am not able to find repeated start condition.

Here is the sequence I need to implement

Is there anything wrong in the implementation? It is always failing.

Please Help!

Thanks

Vibhu

[awneil]

Documentation for nrf_drv_twi_tx:

https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.3.0/group__nrf__drv__twi.html#ga6c83eac2d358bc8fb5b53c53f22506b6

The no_stop parameter can be used to disable the STOP condition - ie, to give you a repeated START on the next transaction.

Also take a look at nrf_drv_twi_xfer - which can do the two transactions for one function call:

https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.3.0/group__nrf__drv__twi.html#ga44215084d42d6a29aa4044c3c2792fc0

[Vibhu]

Thank You So Much awneil.

It seems there should be some delay between the transmit and receive command which I have posted and making the last parameter true as you suggested did the trick.

Now it is working.

Thank You