SPI Transfer(buf, cnt) use FIFO 16 bit #23
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Update SPI.transfer(buf, cnt) to use the FIFO queue to speed things up. It also speeds things up to pack the data into 16 bit transfers instead of 8 bits. As this code is more complicated, no longer makes sense to inline it, so functions moved from .h to .cpp files. SPI1 and SPI2 transfer functions were updated as well for T3.5 and T3.6
Experiment with making the whole transfer of the buffer act like it is to logically hold the CS pins for that whole transfer. This removes gaps between each 16 bit transfer.
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Update SPI.transfer(buf, cnt) to use the FIFO queue to speed things up.
It also speeds things up to pack the data into 16 bit transfers instead
of 8 bits.
As this code is more complicated, no longer makes sense to inline it,
so functions moved from .h to .cpp files.
SPI1 and SPI2 transfer functions were updated as well for T3.5 and T3.6