[EMAIL PROTECTED] wrote: > > I already looked at the emc2/src/hal/drivers directory out i only found > functions which write directly to a set of i/o pins. Isn't there any > function/example to directly write a speed or number of step ticks with > a frequency? Well, you could look at the hal_ppmc.c driver. It uses the parallel port as a communication channel to control boards that do this. There are 3 different products. One is a traditional analog velocity servo interface, with a 16-bit DAC. One generates step/direction, and the last generates a PWM signal. All work like a servo, you read position from an encoder counter, compute a new velocity command in the PID routine (not in the driver but in another part of EMC2/HAL) and then send the new velocity to the controller. This sounds like what your board does using USB. One reason I have not gone with USB is that there is that 1 KHz frame clock. Maybe that is not a limitation with rtusb. I see that high speed usb has 8 micro-frames per ms.
Jon ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
