Dear Robert Hodaszi,
Hi,
Sorry, hopefully that will be a plain-text.
There are a lot of bug announcement, just make a search: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33721
This was apparently fixed three years ago.
And this one six years ago ...
Also, I printed out the buffer addresses, and that temporary RX buffer was not aligned. So the transmit function rounded it down to the alignment boundary, and so caused invalid data transmission. (By the way. Shouldn't the transmit function check whether the alignment is proper, and throw an error message, instead of round it down? That would make more sense.)
Looking at the code one more time, it'd make most sense to simply allocate the buffer NOT on stack, but with some memalign-kind-of call to avoid this abuse of stack. You see, the max packet size is around 2k, which is quite a lot. How does this proposal sound to you ?
Best regards, Marek Vasut