Posted on May 17, 2011 at 13:26> For USB you should have a USB sniffer to see what hapening...
USB analyzers are kind of pricey for the average hobbyist like me.
Actually, I don't know of any specific USB problems with the STM32 NuttX port; everything works. But sometimes, with debug output off, I see timing issues that make me wonder??? Sometimes it takes awhile for Windows to recognize the mass storage device -- but then things work fine: I can read and write files on the microSD from Windows with no problems. That could mean some low-level USB issues that slows the device recognition and only show up when I disable debug output. Or it could just be Windows being confused when the device suddenly change from a DFU device to a mass storage device. The only way that I would know for sure is with a USB analyzer.
