Arduino Mega 2560's SPI MISO/MOSI Flipped

[soypat]

The lines in question. sdi and sdo seem to be flipped.

It would seem that the correct way of arranging SPI0 according to arduino's documentation would be the following

// SPI configuration
var SPI0 = SPI{
    spcr: avr.SPCR,
    spdr: avr.SPDR,
    spsr: avr.SPSR,
    sck:  PB1,
    sdi:  PB2,
    sdo:  PB3,
    cs:   PB0}

I've tested both ways, the second one seems to actually work.

[soypat]

If someone can get around to testing the Arduino Mega that'd be great. I couldn't get the SPI to work for the life of me.

[soypat]

I have gotten around to testing the Arduino Mega's SPI with the MCP3008 library.

The following setup worked for me:

• Use TinyGo library without modification (works fine right now)
• Connecting Pin 51 to MCP3008 Din (MOSI)
• Connecting Pin 50 to MCP3008 Dout (MISO)
• Connecting Pin 53 to MCP3008 CS (Chip select)
• Connecting Pin 52 to MCP3008 CLK (Serial clock) machine.D51 is equal to machine.PB2 (equal to 10), which appears as sdo in SPI0 configuration, which confused me (I thought SDO was Slave Device Output). I'd like to point out these names are easy to mistake, as manufacturers commonly use SDO/SDI for their pins.

[deadprogram]

We try to follow the guidelines of the Open Source Hardware Association regarding naming of pins in the SPI interface.

Please see: https://www.oshwa.org/a-resolution-to-redefine-spi-signal-names/

Thank you!