TWIS (I2C slave) no IRQ

RE: TWIS (I2C slave) no IRQ

Dominik Eugster — Thu, 30 Sep 2021 16:47:02 GMT

I got it worked now, after days. Maybe it would be a good idea to provide some nrfx examples for the TWI and TWIS on the same port with IRQ, I didn't found some example code and its not really clear how the implementation should be. I think other people will have the same problems.

RE: TWIS (I2C slave) no IRQ

Einar Thorsrud — Thu, 30 Sep 2021 13:13:07 GMT

Hi,

The driver should ensure that interrupts are enabled and that the event handler is called as long as an event handler is provided when you call nrfx_twis_init(), which I see you do here. There may be some complications when you use peripheral resource sharing (PRS), though. Can you share the PRS related configurations from your sdk_config.h?

RE: TWIS (I2C slave) no IRQ

Dominik Eugster — Thu, 30 Sep 2021 10:12:17 GMT

[quote userid="107899" url="~/f/nordic-q-a/80128/twis-i2c-slave-no-irq/331831#331831"]conclusion: TWIS and TWI (master and slave) at the same time on different peripherals are not possible?!?[/quote]

correction, when I use he same NRFX instance, its worgking, but still missing the IRQ... Do I have to enable some flags which IRQ is acive or anything else?

const nrfx_twi_t m_twi_1_master = NRFX_TWI_INSTANCE(1);     /**< TWI master 1 instance */
const nrfx_twis_t m_twis_1_slave = NRFX_TWIS_INSTANCE(1);    /**< TWIS slave 1 instance */

RE: TWIS (I2C slave) no IRQ

Dominik Eugster — Thu, 30 Sep 2021 06:49:39 GMT

I just recognized, that the NRF_ERROR_BUSY is in realtion with the TWI instance 0.

const nrfx_twi_t m_twi_0_master = NRFX_TWI_INSTANCE(0); /**< TWI master 0 instance */
const nrfx_twi_t m_twi_1_master = NRFX_TWI_INSTANCE(1); /**< TWI master 1 instance */

I need the TWI instance 0 and 1 as master in normal oiperation. After this, I need the TWI 0 as master and TWI1 as slave (TWIS). When I call nrfx_twi_disable(&m_twi_0_master) and nrfx_twi_uninit (&m_twi_0_master) before calling the init for the TWIS i have ret = success.

conclusion: TWIS and TWI (master and slave) at the same time on different peripherals are not possible?!?

-> please confirm

ret = nrfx_twis_init(&m_twis_1_slave, &twis_config_1, twi_slave_event_handler);

    /* Init TWIS */
    if (NRFX_SUCCESS == ret)
    {
        nrfx_twis_enable(&m_twis_1_slave);
    }

RE: TWIS (I2C slave) no IRQ

Dominik Eugster — Wed, 29 Sep 2021 15:40:04 GMT

In the debug Log I got the output:

<warning> PRS: Function: nrfx_prs_acquire, error code: NRF_ERROR_BUSY.

I use the same TWI port as master before, then I call twi_master_uninit and after this nrfx_twis_init which is causing the error, but why?

I tried with nrfx_prs_release(&m_twi_1_master);, but this is not solving the problem.