Sebastian, Yes, I think they are pretty close to the same, I was just assuming that at some point on the FPGA side, you had to latch and perhaps bit shift the value in the PCI address space, so that it cannot change while you are doing any operations with that value.
Otherwise, the value calculated by pwmgen.c to be put into the value register does seem to be the correct, and if bits 16 through 27 is where it is to go in that register, then everything on the driver side appears to be correct. I realize that a voltmeter may not be a reliable means of measuring a PWM, but my particular voltmeter does seem to agree with the power output of the laser. It also agrees with the voltages I read when using the standard m5i20 driver, which is already known to produce good values. Thus, given the consistency and linearity of the readings, I am fairly confident that they reasonably reflect what is going on with the PWM output. Regards, Eric By "FPGA register" i mean the register on the 5i20 board where the driver on the PC tells the 5i20 what PWM duty cycle it wants. I think this means both of the things you described. Ok so we're in agreement that the proper PWM value is being requested of the 5i20 board, and the question now is whether the FPGA outputs the proper PWM signal. ... It is my understanding that a normal voltage meter is not a reliable tool for measuring the pulse width of a PWM signal. I'll see if I can borrow an oscilloscope from work... ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
