Pin Numbers on the nRF5340-QKAA

[Learner]

Good morning Nordic,

I am trying to configure the I2C pins for our board (using nRF5340-QKAA SoC) but I cannot find the pin numbers for I2C_SDA and I2C_SCL.

All I could find in OPS_v0.6.1 is a reference to pin labelled

P0.02 -> W1

P0.03 -> AA1

The same for the A2D

P0.28/AIN07 -> AE31

I am looking for actual pin numbers to use in my .dts  or .overlay files.

Is there a document that maps theses labels AA1 etc... to actual pin numbers on the chip.?

Thank you.

Mohamed

[Andreas]

Hi,

 

See the pin assignments section in the PS.

 

You can also find this through the reference layout.

 

Best regards,

Andreas

[Learner]

Thank you Andreas.

Unfortunately, unless I am missing something, my answer remains unanswered. The two links you sent still show pins labelled as L1, C1 etc... but I need a real number. I expected the pins to be numbered in a continuous manner from 1,2,3,... to 98 or whatever the number of pins on the chip. This is in order to be able to use them in the .dts file e.g. 

&spi2 {
compatible = "nordic,nrf-spim";
status = "okay";
sck-pin = <13>;
miso-pin = <40>;
mosi-pin = <9>;
};

Looking forward to your answer.

Mohamed

[Andreas]

Hi,

 

This number is just the GPIO number, e.g. if you have SCK on P0.13, the you just write <13>. You can read more about this in our nRF Connect SDK tutorial.

 

Best regards,

Andreas

[Learner]

Thank you Andreas,

Hmm! How does the build environment distinguish whether we meant to say P0.13 or P1.13?

Kind regards

Mohamed

[Andreas]

Hi,

 

P1.13 is another way of writing P0.(32+13), just write 45 or respective number in the overlay file.

 

Best regards,

Andreas

[Learner]

But in the .dts file we do not mention which port the pin is on. We just put a number for the pin.

If I did not misunderstand, you said if the sck is on P0.13 just put sck-pin = <13> in the .dts file.

Extrapolating this I would then, if sck is on P1.13 just put sck-pin = <13> in the .dts file.

So, how the Device Tree be able to distinguish between pin 13 on P0 and pin 13 on P1?

Please clarify your answer.

Thank you.

Kind regards

Mohamed

[Andreas]

Hi,

 

Assume SCK is on Px.y, then you shall enter sck-pin = <32*x+y> in the dts file. For P1.13 this is sck-pin=32*1+13 = 45.

 

Best regards,

Andreas

[Learner]

Thank you Andreas.

This is a much clearer answer. I don't think I've seen this mentioned anywhere in the documentation. Is it?

Your earlier answer (shown below) was unclearer hence my follow-up questions.

"This number is just the GPIO number, e.g. if you have SCK on P0.13, the you just write <13>."

We got there at the end. 

Kind regards

[Andreas]

Hi,

 

Sorry for confusing answer previously, happy to hear that I managed to make myself understood in the end. 

 

Best regards,

Andreas