Use TWI in blocking mode

[ran]

1.How do I use TWI \ TWIM Read\Write in blocking mode ? 

I am facing an issues with my nrf52840 based design, where I issue consecutive TWI write\read . 

I am monitoring the I2C bus transaction with Logic Analyzer. When executed step-by-step ( debug ) , all transactions goes well on the bug. 

( or when using 200 ms delay between transactions for ex.  ) 

When "running" ( no bkp ) - the transactions are not complete , so it seems that I am writing\reading a new transaction while the previous is on-going. 

I'd like to use the TWI in a complete blocking mode ( i.e not returning before transaction is completed , using xfer-done and events is complicated in my case ) 

Thanks, 

Ran

[BinderT]

If the event_handler parameter is passed as NULL in nrf_drv_twi_init(). TWI will be put in blocking mode.
From the SDK

 * @param[in] event_handler   Event handler provided by the user. If NULL, blocking mode is enabled.

ret_code_t nrf_drv_twi_init(nrf_drv_twi_t const *        p_instance,
                            nrf_drv_twi_config_t const * p_config,
                            nrf_drv_twi_evt_handler_t    event_handler,
                            void *                       p_context);

[ran]

Thanks, 

That is my impl. ( NULL for evt_handler ) . What else might be the reason for different bus transaction between step-by-step and "running" ? 

It seems like "blocking" does not really works , I will upload screen shots tomorrow if it helps

[Øyvind]

Hello Ran, 

Can you please provide more information? Have you verified your timing with the TWI device? Since it works in debug and not when running, it sounds like a timing issue.

Kind regards,
Øyvind

[atlesilgjerd]

It seemes I have this problem too... SPI event comes when I step through debugging. But when I run without breakpoints in the code, it hangs waiting for the event. 

while(!NRF_SPI1->EVENTS_READY);

It seems to be the same problem with SPI0. I am running on nRF52840 and using Segger Jlink lite.

best regards,

Atle

[Øyvind]

Hi atlesilgjerd,
Can you please enter your question in a new support ticket? 

Thank you!

Kind regards,
Øyvind