Can not use P2.0 P2.1 in nRF54L15 for I2C

[Ziyao Zhou]

Hi,

I have cut SB12 16 and connected SB17,18 and using P 2.01 as SCL (clcok pin), however, the I2C cannot work

&pinctrl {
    /omit-if-no-ref/ i2c22_default: i2c22_default {
        group1 {
            psels = <NRF_PSEL(TWIM_SCL, 2, 1)>,
                <NRF_PSEL(TWIM_SDA, 2, 0)>;
        };
    };

    /omit-if-no-ref/ i2c22_sleep: i2c22_sleep {
        group1 {
            psels = <NRF_PSEL(TWIM_SCL, 2, 1)>,
                <NRF_PSEL(TWIM_SDA, 2, 0)>;
            low-power-enable;
        };
    };
};

[JesseFU]

Hi Ziyao

There is no TWIM/TWIS on P2. For I2C_2x, you should use the pins in P1, and TWIM_SCL needs to use a clock pin.

Best Regards,

Jesse

[Ziyao Zhou]

Thank you! I use P1.04 and P1.08, it works. I also found both pin should be the clock pin, the information is different to the datasheet.

[JesseFU]

It's great to know that you've managed to get I2C working. Typically, it's not necessary for the TWI SDA to use a clock pin. Please ensure that the tested pin is not being used by any other peripherals in the device tree.

Best Regards,

Jesse

[Sai]

The datasheet says you can use dedicated pins for TWIM on P2. Is that not the case? 

[Ziyao Zhou]

I use P1 as P2 cannot work for me

[JesseFU]

Hi Sai,

Please refer to below link

https://docs.nordicsemi.com/bundle/ps_nrf54L15/page/chapters/pin.html#ariaid-title2

For P2, there are dedicated pins for UART20/21, SPI20/21.

Best Regards,

Jesse