Jon Elson wrote: > [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.
Thx allot for your answer Jon and Jeff. I will have a closer look at the drivers you mentioned adn try to get it running. jan ------------------------------------------------------------------------- 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
