On 08/26/2016 12:00 AM, rolfm@dds.nl wrote:

hi,

in another thread i explained that my Raspberry situates the Arduino on port 0.

when comport is defined like [comport 0 115200] there's a message in the Pd console: port number out of range (1-99).

but comport will connect with port 0. and it seems to work, at least the sending from Pd to the Arduino.

my question: can i trust it?

trust what?

on w32 all comports are available as COM%d (e.g. COM1,COM2,...)

on unix things are a bit different: a serial device is (like any other device) just a file, usually one that goes by the name /dev/ttyS* or similar. since there is no "natural" numbering of serial devices (unlike on w32), comport does a little trick: when given a numeric device specification (e.g. 3), it will enumerate some known device names (/dev/ttyA*, /dev/ttyS*, /dev/ttyU*) and the first device in this enumeration will get the number 0 assigned (so device '3' is the 4th device found by this method).

so you cannot trust that '0' is the device that you used to connect your Arduino board to.

because i suppose the message means that the code is written for 1-99.

well, no - not necessarily. i guess the reason why it mentions 1-99, is that the error method was copied between w32 and un*x implementation. (otoh, skimming through the code¹, it seems that this error message only gets triggered in the w32 code section, so i wonder how you manage to get it on the raspi).

fmgdsar IOhannes

¹ pd-svn rev.17625