SPI gunk stuck in serial on power off

[jingman]

I was recovering from an "SPI error" and found that on every power cycle, there was a bit of SPI "gunk" spit into the serial prompt right when I powered it off. The gunk persists even after unplugging/replugging.

...
SPI 0xff?
SPI 0xff?
SPI 0xff?
SPI 0ü
Hello from Pinoccio! 
 (Shell based on Bitlash v2.0 (c) 2014 Bill Roy)
 16351 bytes free
 Lead Scout ready
> SPIü
Hello from Pinoccio! 
 (Shell based on Bitlash v2.0 (c) 2014 Bill Roy)
 16351 bytes free
 Lead Scout ready
> SPI 0xþ
Hello from Pinoccio! 
 (Shell based on Bitlash v2.0 (c) 2014 Bill Roy)
 16351 bytes free
 Lead Scout ready

I ran scout.daisy;scout.daisy and there was no response (frozen). I power cycled the board and got the SPI dump problem immediately on boot. Power cycled again, scout.daisy;scout.daisy completed successfully, but I still get SPI in serial on every power-off.

[matthijskooijman]

Weird... I wonder where that output actuall comes from. Grepping through the wifi library, it seems the only messages it outputs containing "SPI" are:

src/GSModule/GSCore.cpp:    dump_byte("SPI: >> ", out, false);
src/GSModule/GSCore.cpp:        SERIAL_PORT_MONITOR.println("SPI 0xff?");
src/GSModule/GSCore.cpp:        SERIAL_PORT_MONITOR.println("SPI 0x00?");
src/GSModule/GSCore.cpp:        SERIAL_PORT_MONITOR.println("SPI ACK received?");

The first is only enabled when GS_DUMP_SPI is defined, which I don't suppose you have Weird...enabled. The other messages don't actually dump the byte received, so that doesn't explain the ü and þ characters. I'm not sure what is going on here, but I'll keep an eye if I find something similar.

[amcjen]

Probably related to: Pinoccio/library-gainspan-s2w#4