USB 16 Servo Controller Linux

[agising]

Hello!

I cant make my Pololu USB 16 to work on Linux Ubuntu. I am quite sure that my problem is my port settings.
I have seen the example code using the termios structure, but I’m used to use open ports using fopen and I would like to do so in this project too (fopen opens streams).
I started testing my code on my macbook running osX. The program runs without problems, and it shows that the Pololu USB 16 Servo Controller is a great servo controller! Now i want it to work on my small linux computer too!

Once I run the program on the linux machine, the red LED is lit and the yellow led flashes, indicating too slow baudrate. Although, its not the baudrate. I have tried baudrates from 9600 up to 57600, and it works just fine with 9600 baud on my macbook.

I think the trick is to get all the flags correct using stty -F /dev/ttyUSB0.
Can anyone please post ALL the stty flags from a correct set up port, i.e. from a functional USB 16 Servo Controller.

This command gives ALL the stty flags:
stty -F /dev/ttyUSB0 -a

These are my current settings: (I’m using ttyUSB1)

rex@trex:~/ctl$ stty -F /dev/ttyUSB1 -a
speed 9600 baud; rows 0; columns 0; line = 0;
intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = <undef>; eol2 = <undef>; swtch = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R;
werase = ^W; lnext = ^V; flush = ^O; min = 1; time = 0;
-parenb -parodd cs8 hupcl -cstopb cread clocal -crtscts
-ignbrk -brkint ignpar -parmrk -inpck -istrip -inlcr -igncr -icrnl -ixon -ixoff -iuclc -ixany -imaxbel -iutf8
-opost -olcuc -ocrnl onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0
-isig -icanon -iexten -echo -echoe -echok -echonl -noflsh -xcase -tostop -echoprt -echoctl -echoke

Thank you in advance!

EDIT: I have tried the code snippet from lukelukeluke which is using the termios struchture with the same result. Red LED lit, yellow LED flashing.

Making the controller work under linux (setserial...?)

Hello, I don’t think that setserial is a program you should be using. I’ve never used it before, and according to the man page, it’s designed to configure the way linux communicates with your serial port hardware - it does not set the parameters of the actual serial communication, like baud rate and stop bits, and it does not send data to the serial port. In particular, baud_base is not the same thing as baud rate. Also, I’m not sure where you got the idea that you should be using 4700 baud …

[agising]

The problem is my computer, not my code.
I tried the code on an other linux computer and it worked great…
These stty flags worked grat with my Pololu USB 16 Servo Controller: (print screen)

Yes, I used USB0 this time, and I did not change the address in my servo_close()

[paul]

Great, I’m glad you managed to get it working after all. Do you know what the problem was with the first computer?

-Paul

[agising]

I’m afraid not… I have set ALL the flags exactly the same, but it’s still not running. I don’t really know what to do at this point, but I’ll post here when (if) I get it to work!

[msg5393]

I just read over this forum because I’m having trouble finding a code that will allow me to talk to the same servo controller on a mac. I am more of a beginner when it comes to writing code, so I’m sure the error is in the code I’m writing. I was hoping that I could get some help with exactly what the code should look like that you used on your Mac. I generally work with C++ but any language will pretty much help. Thanks.

-Matt

[ryantm]

Hello,

Matt seems to be discussing this same question over at this topic. Let’s continue the discussion about C++ servo controllers programs on the Mac over there.

- Ryan