TWI_Scanner example on PCA10040 not Working

[Ameer Usman]

The TWI_Scanner example is building and downloading fine (using SES) but it just prints:

"TWI scanner started."

Then nothing in terms of scanning addresses etc.

It does not give any app error checks. Seems it gets stuck inside:

err_code = nrf_drv_twi_rx(&m_twi, address, &sample_data, sizeof(sample_data));

Let me know if further information is needed.

[Ali Rumane]

Hi,

Can you add DEBUG in Preprocessor Symbol Defines, set Optimization Level to 1 and try to debug which function is causing error?

You can look at the following links to debug your code:

Link

Link

Basics of Debugging - Segger Embedded Studio

Are your TWI pins connected and configured correctly? Are you using DK or custom board?  Which SDK are you using?

[Ameer Usman]

I am using nRF52832 DK at the moment with SDK 15.3. If I pause the program it shows being here:

__STATIC_INLINE bool nrf_twim_event_check(NRF_TWIM_Type * p_reg,
                                          nrf_twim_event_t event)
{
    return (bool)*(volatile uint32_t *)((uint8_t *)p_reg + (uint32_t)event);
}

[Ali Rumane]

Hi,

It is a bool function and shouldn't stop there. Can you watch the video from third link and debug if you come across errors or something?

[Ameer Usman]

No errors found in debugging.

[Ameer Usman]

Found the problem and was on my end. Actually another device was connected on the same pins of I2C that was not using I2C communication (I guess it was using SPI). Removing that device fixed the problem.