And between those instructions, is there a one, which changes what PORTC pins to use, when sending data out? Except the DATA_ONE and DATA_ZERO defines?
Therefore please look at the caller, which is in this case AsicPushWork in klondike.c, the argument there is DATA_SPLIT, which does the bits for single bank mode. In double bank mode one bank gets a one, the other a zero for MSB. Please also look what exactly the asm code tells, the last lines in send32 function differ from the others.
Steamboat and Marty's group have been unable to get this design to work.