Accessing the nrf52820 pins

[MuRa]

Hello all

I am porting the code from the nRF52DK to the nrf52820, and so far so good, however, I am having a question, when configuring the TWI, will this get me the right PINS, for instance, according to the module manufacturer I should be accessing the P0.02 for SDA, while P0.08 for the SCL , this is my code:

void twi_init (void)
{
    ret_code_t err_code;

    const nrf_drv_twi_config_t twi_config = {
       .scl                = NRF_GPIO_PIN_MAP(0, 8), // ARDUINO_SCL_PIN,   //Add you SCL Pin Here
       .sda                = NRF_GPIO_PIN_MAP(0, 2), // ARDUINO_SDA_PIN,   //Add you SDA Pin Here
       .frequency          = NRF_DRV_TWI_FREQ_100K,
       .interrupt_priority = APP_IRQ_PRIORITY_HIGH,
       .clear_bus_init     = false
    };

    err_code = nrf_drv_twi_init(&m_twi, &twi_config, twi_handler, NULL);
    APP_ERROR_CHECK(err_code);

    nrf_drv_twi_enable(&m_twi);
}

This part works on the nrf52dk, for example where I am directly using the P0.27 and P0.26, however, the numbers 26 and 27 are simply used, as 26 and 27... 

hence my question, if I am accessing the pins correctly?

best.

[nRF5xFanboy]

Hi MuRa,

sorry to place the reply here, this site sometimes does not show the reply button under recent tickets. ????

F5 => P0.02
F7 => P0.08

Lets say I would like to assign the TWI, namely F5 = SDA and the F7 = SCL ... not really sure how to consider the in/out properties of the TWI.. with regard to the GPIO configuration...

then just change some code in my given example (see earlier posts)

const uint32_t scl_pin = NRF_GPIO_PIN_MAP(0, 2); /*port-0 pin2 (= F5) */   
const uint32_t sda_pin = NRF_GPIO_PIN_MAP(0, 8); /*port-0 pin8  (=F7) */

By doing this the nrf52820 will route (internally) the pin F5/F7 not to the GPIO but to the TWImaster.
so no worry about gpio input/output (they do not exist then.

2nd question: about testing.
I think about attaching a oscilloscope (or my favorite Saleae a logic analyzer) to the F5 and F7 and check the signals.

Kind regards,
   nRF5xFanBoy