I've found a little bug, and the solution can be helpful to someone:

A have a TB6560 based board (4v3 - "the red one"). There were a lot of errors, missing steps, the motors sometimes worked sometimes not...I've tried everything. Finally the solution was, that I needed to invert the ENABLE signal ...

Oops, forget it, there is one tiny problem: whenever a limit is reached, I coudn't move the motors again...
If I don't want to use "if-else" in every motorcommand-cycle, I'm afraid it is necessary to do the checking procedure in an interrupt...

Hi Martin,

Shall I suggest a little improvement in your arduino code?
I inserted the following declarations in the setup():

pinMode(A0, INPUT); // PC0, X1 limit switch
pinMode(A1, INPUT); // PC1, X2 limit switch
pinMode(A2, INPUT); // PC2, Y1 limit switch
pinMode(A3, INPUT); // PC3, X2 limit ...

Hello everyone!
First of all, I didn’t make any improvements in the topic, I just used Jerome and Martin’s work, so every credit is over there. As a lame, like me, I spent several days to figure it out how exactly this stepper-motor commanding stuff works. So I’d like to share my experience ...

Hi guys,
I never wrote to the forum, but today I must.
Jerome and Martin: big Gratitude for your work! Finally my chinese (TB6560-based) board came alive, and the motors spinning like a dream:) I didn't have any arduino, so I refined a little Martin's code (to be able to load it up without arduino ...