I built a PCB as outlined by the nRF52840 datasheet, however, P0.06 (my SCL line) is not working. I can assign SCL to other pins (like P01.10), however, P0.06 will not work. Why not? It does not mention legal or illegal i2c pins in the datasheet.
The output when using P0.06 is a diamond with a triangle in the middle, instead of actual values.
The following code works, however, I need to use P0.06 for SCL, and P0.27 for SDA.
&uart0 {
pinctrl-0 = <&uart0_default>;
pinctrl-1 = <&uart0_sleep>;
pinctrl-names = "default", "sleep";
status = "okay";
};
&i2c0 {
label = "I2C_0";
compatible = "nordic,nrf-twim";
pinctrl-0 = <&i2c0_tempDEF>;
pinctrl-1 = <&i2c0_tempSLP>;
pinctrl-names = "default", "sleep";
status = "okay";
};
&pinctrl{
i2c0_tempDEF: i2c0_tempDEF {
group1 {
psels = <NRF_PSEL(TWIM_SDA, 1, 1)>,
<NRF_PSEL(TWIM_SCL, 1, 10)>;
};
};
i2c0_tempSLP: i2c0_tempSLP {
group1 {
psels = <NRF_PSEL(TWIM_SDA, 1, 1)>,
<NRF_PSEL(TWIM_SCL, 1, 10)>;
low-power-enable;
};
};
};
EDIT: Still no solution, but I may have found the cause of the problem. Although this is not listed in the datasheet... the following link indicates that P0.06 has a default setting of "UART", and I have intentionally reassigned the original UART pin to something else, without issue there, UART works perfectly fine with its reassignment. Is it possible that I'm being 'blocked' from using P0.06 because even though it's reassigned, the MCU is still reserving it for UART? How can I work around this?
