PICStep Firmware development started!

Here is my breadboard with a development version of the firmware displaying on a 10 LED bar. I'm testing the interrupt routine and the mode switching. I'm pretty much pushing the limits on the I/O of the 16F628, but then again what's the use of all those I/O pins if you never use them!

Currently I've got the design laid out as followed :-

• RA0 - CA0 | Coil A Bit 0
• RA1 - CA1 | Coil A Bit 1
• RA2 - CA2 | Coil A Bit 2
• RA3 - CA3 | Coil A Bit 3
• RA4 - MODE0 | Mode Input Bit 0
• RA5 - MODE1 | Mode Input Bit 1
• RB0 - STEP | Step Input
• RB1 - DIR | Direction Input
• RB2 - CB0 | Coil B Bit 0
• RB3 - CB1 | Coil B Bit 1
• RB4 - CB2 | Coil B Bit 2
• RB5 - CB3 | Coil B Bit 3
• RB6 - CBD | Coil B Direction
• RB7 - CAD | Coil A Direction

This means the RA5/MCLR line is turned internally to high so I can use it as an input. I'm also going to design the PCB with a jumper block/DIP switches to enable ICP via a programming header on board. This will allow me to update the firmware in-circuit in case there are some modification I wish to make after the fact (1/32 stepping maybe :)