Pull down SDA pin i2c

[Hkhan7861]

Good day

I am developing on the nrf9160dk with a tag reader using i2c and am wanting to know if there is a function to pull down the SDA or SCL pins during operation in order to wake up the slave device.

Thank you in advance.

Kind regards,

Hassan

[Hkhan7861]

I will post a picture at a later stage thank you.  I am still not able to find this function.  I am not sure you understand my question.  Please refer me to where the start condition is handled.

[Vidar Berg]

Hkhan7861 said:

I am still not able to find this function.  I am not sure you understand my question.  Please refer me to where the start condition is handled.

There is no function for this because it is handled in HW.

[Hkhan7861]

Oh I see okay thank you ! so would I just need to use 

nrf_twim_task_trigger(p_twim, NRF_TWIM_TASK_STARTTX) and the startup condition will be handled?  

Thank you .

 

[Vidar Berg]

The TWIM peripheral must be configured to transmit data before you can trigger the start task. It is easier to just use the driver APIs to start a transaction as it will take care of the configurations for you.

[Hkhan7861]

Good afternoon

By driver API's, do you mean this function.

     struct i2c_msg *DevFnc ;

     DevFnc->buf = &devSelCode;

     DevFnc->len = 8;

     DevFnc->flags = 1;

     i2c_nrfx_twim_transfer(i2c_dev,DevFnc,1, 0x53 );

If so, are there any samples where I can see the use of this.

Kind regards,

Hassan