In SX Microcontrollers, SX/B Compiler and SX-Key Tool, metron9 wrote:

The only thing I can see is the difference in the time the signals are transitioned and held between the two sets of code.

Just for fun, try using a pause 1 between every high and low code in both the initialize code and the subroutines.  It may be at high speeds the transitions are not doing what you think they are because of stray capacitance or something else.  If it's not that then all I can offer is more scope output on pins you wish to see using the sx28 chip.

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