On Sun, Nov 04, 2007 at 03:39:03PM +0100, [EMAIL PROTECTED] wrote:
> Jeff Epler wrote:
> > No USB hardware is supported by emc at this time.
> The card implements the USB CDC class (it lookes like a serial card to
> the operating system with the usbserial modul). So i thought since
> serial connection can be used it would also be possible to use the USB
> counterpart.
The existing "serport" driver merely uses some of the pins on a "serial
port" as dumb I/O--for instance, you could produce a "step and
direction" waveform and hook it to physical pins 3 and 4 on the 9-pin
serial connector. It does not use a "serial protocol".
> 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?
Many of the drivers do this, but in each case the structure of the code
is specific to the device. For instance, in the case of the mesa 5i20
card, the requested analog output value value is turned into a
device-specific "dacCount", then written to the board's memory mapped
register:
http://cvs.linuxcnc.org/lxr/source/src/hal/drivers/hal_m5i20.c#882
Jeff
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