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,

nrf gpio are always made up of a combination of port & pin number. 
thus .. 
"the numbers 26 and 27 are simply used, as 26 and 27"
simply implies the port value is zero (0) 

Kind regards,
   nRF5xFanBoy

[MuRa]

Hey and cheers, 

so the number 8 and 2 could be easily used?  

Best.

[nRF5xFanboy]

Hi MuRa,

The correct way to be sure what pin/port is used is to look & check with the electrical drawing of your board.
Sometimes it is easy because the make has written the silkscreen text on the PCB (like with the nRF52DK)

Kind regards,
   nRF5xFanBoy

[nRF5xFanboy]

What vendor/brand is the board with your nrf52820

[MuRa]

PAN1781

[nRF5xFanboy]

Hi Mura,

Panasonic PAN1781 is just a module.
What is vendor of the rest of the hardware?

One of advantage of the Noridc micrcontroller nrf52 is you can configure the routing of IO pins.
So they are not fixed, yet.
The TWI port/pins of the nrf52820 inside the pan1781 module are becoming fixed by solder the pan1781 and external parts onto the PCB. 

Thus a electrical drawing of your board is mandatory to find out the TWI port/pins.

Kind regards,
   nRF5xFanBoy

[nRF5xFanboy]

Hi Mura,

Do you have an electrical drawing of your board because it
holds the answer to you question of the TWI port/pins.

Kind regards,
   nRF5xFanBoy

[MuRa]

There is no rest of the hardware, this is a prototype :)

[MuRa]

The el schematics is here: New Output (panasonic.de) !

Best.