TWIS (I2C slave) no IRQ

[Dominik Eugster]

Hi

I'm trying to use the nrfx TWI Slave function with IRQ (No Poll), but there is no clean code available I found.

I'm using the following code:

const nrfx_twis_t m_twis_1_slave = NRFX_TWIS_INSTANCE(1);    /**< TWIS slave 1 instance */

#define STEINEL_SENSORS_MY_ADDRESS		0x08

const nrfx_twis_config_t twis_config_1 =
{
	.addr = { (STEINEL_SENSORS_MY_ADDRESS >> 1), 0 }, 
    .scl = RJ11_I2C_SCL,
    .sda = RJ11_I2C_SDA,
    .scl_pull = NRF_GPIO_PIN_NOPULL,
    .sda_pull = NRF_GPIO_PIN_NOPULL,
    .interrupt_priority = APP_IRQ_PRIORITY_HIGH
};

NVIC_ClearPendingIRQ(SPIM1_SPIS1_TWIM1_TWIS1_SPI1_TWI1_IRQn);
NVIC_SetPriority(SPIM1_SPIS1_TWIM1_TWIS1_SPI1_TWI1_IRQn, 6);
NVIC_EnableIRQ(SPIM1_SPIS1_TWIM1_TWIS1_SPI1_TWI1_IRQn);

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

if (NRF_SUCCESS == ret)
	{
		printf("twi slave init success\r\n");
		nrfx_twis_enable(&m_twis_1_slave);
	}

But even if I can see the data on the oscilloscoipe with the address 0x08, the function

static void twis_event_handler(nrfx_twis_evt_t const* const p_event)

never gets triggered. Whats the provblem here? It's not normal to spend hours and days for a I2C slave feature, but without examples its try and error...

Any inputs from Nordic side? Or a example code with IRQ?

[Dominik Eugster]

Dominik Eugster said:

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

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 */

[Einar Thorsrud]

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?

[Dominik Eugster]

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.