Hello!
tested reading ports A, B and C syncronously and port reading works OK,
but then tried syncronous writing with REG_PIOx_ODSR command did not succeed ,
although bitwise setting with REG_PIOx_SODR and clearing with REG_PIOx_CODR works OK,
I might have something wrong although tried also setting first REG_PIOx_OWER mask bit for those bits I wanted to write
syncronously ,
another test result still: enabled output to several bits with pinmode (xx, OUTPUT) commands but still the REG_PIOx_ODSR does not write
to the PIO port ,
so as a summary so far: input port reading (bytes , words , double words) reading works OK but
output does not work (yet 
testing continues ....