Error: unterminated string

[DonKracho]

First of all, thanks for sharing your great work.

I use the polarshield server comiled for an Arduino Mega/Ramps 1.4 configuration (with A4988 drivers installed for Y and E1)

The polargraph cotroller struggled with garbage on the COM Port. There is a bug in comms.ino in the function void comms_extractParams(char* inS). When allocating space for the string on stack there has to be room for the trailing 0 character at the end of a C-string. (strlen() does not count this).

Therefore the first line (line:191) of the function should read as char in[strlen(inS) + 1];
The subsequent strcpy(in, inS) takes care about the trailing 0 of a C-string. so that's OK then.

Just another hint: My A4988 drivers did not get enabled. In configuration.ino I had to set the last parameter of setPinsInverted(false, false, true) to false, because the signal isn't inverted.

[euphy]

Thanks for the note! That's a good spot, you've done this before I think!

The a4988 driver itself does enable when pulled low. How come yours don't? It's not a RAMPS thing is it?

[DonKracho]

The drivers were sold as A4988 and the board is a RAMPS 1.4. I got my polar graph up and running now. For some reasons I had to configure 100 setps/revolution for a 16 teeth pulley and a GT2 belt (32mm/revolution). The Stepper has 1.8°/step. I have to figure out what's going on there.