Navio2 Raspberry Pi SWD pins

Navio / Edge Hardware
1

Hello guys,

I have already seen your new pinout schematic for the Navio2 board but I have a question that I couldn’t figure it out the answer from previous forum topics on the subject.

From the schematic I could understand that STM32 is communicating PPM, PWM and ADC values with Raspberry Pi through SPI using the following pins:

RCIO_SPI_SCLK - GP21
RCIO_SPI_MOSI - GP20
RCIO_SPI_CS - GP16
RCIO_SPI_MISO - GP19

What I couldn’t understand was the purpose of the remaing pins:

RCIO_SWD_IO - GP13
RCIO_SPI_CLK - GP12
RCIO_PC11 - GP5

RCIO_SWD_IO is the bidirectional data line for SW debug interface. Is the RCIO_SPI_CLK the SWD clock signal? This is confusing because in the schematic there are two SPI clock sources.

Finally, what is doing the RCIO_PC11 pin? Where is it connected to?

Thanks for he attention!

Best regards,

tostini

2

@anon87507504 hey! There’s a mistake on the pinout picture, thanks for catching this. AFAIR GP12 should be SWD_CLK. We’ll fix this. RCIO_PC11 is for an interrupt from the RCIO co-processor.

1 Like
3

Thank you Mikhail!

One more thing, the interrupt is for what?

Best regards

4

The interrupt is used to let Raspberry know of processed transactions on the bus.

5

Thank you Staroselskiy!

Best regards.