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Aratti,
i've found a glitch in the microstepping mode, maybe you can confirm if it's software related.

If you enummerate the coils from A to D, then when changing from coil D to A the transition...

You can build up an interpreter for the serial stream with another pic, no so pretty but is a simple and fast solution.

Working fine on the 16F628A

In my design I upgraded the power stage to an ULN2068 (1.5A max per output) and put an embedded FTDI usb to USART chip. All on a 100x50mm single sided PCB (I'll share...

Seems like a nice way of driving steppers, really a clever solution with gate logic.
(long live gates, gates are[n't] dead)

One question:

The hex file included is version compatible with the...