On Sun, Nov 04, 2007 at 01:20:34PM +0100, [EMAIL PROTECTED] wrote: > Hi > > I have a milling machine here which i want to control with emc. Fo the > first tests im using the "normal" parallel port adapter. I'm, however, > afraid of loosing steps on my stepping motors so im planing to use some > quadratur encoder to also measure the position of the axes. My questions > now are: > > 1. Is it better to use a dedicated board which is able to control the > stepper motor and readout the quadratur encoders. The board is connected > via usb (usbserial modul) and the board can send a command for either > speed or steps of the motor.
No USB hardware is supported by emc at this time. > 2. How would i readout quadratur encoder on the parallel port Use the 'encoder' module. After installing emc, "man 9 encoder". > 3. How many stepper motor can i control maximum with one parallelport > and emc? Each stepper motor requires 2 hardware output pin. The parallel port has 13. So if no pins are required for other purposes, 6 stepper motors can be controlled, with one output pin left over. > I know that question one implies writing a adaper for the hal. I have > basic experience in xenomai programming. Would it be hard to implement > the usb board into emc? You'd need a very thorough, low-level knowledge of USB in order to make a USB driver fit the HAL model (hardware read and write takes place according to function position in HAL threads, not based on interrupts or DMA). I don't even know whether this is possible. Jeff ------------------------------------------------------------------------- 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
