PMW signal mesa 7I76

Hi all,

I have a question: is it possible to get a PMW signal with different duty-cycle and waveform on a 7I76 MESA card?

Thank you.
 

The step/dir outputs on a 7I76 are just 5V buffers so can output PWM
if desired (using firmware that replaces a stepgen with a PWMgen)

Hi, I also want this feature. Don't understand "using firmware...".
Can it be implement in a .ngc program so i can use the program in the toolchanging operation. If possible, can you show how the program looks like?

Thanks,

Standard 7I76 firmware has 5 hardware step generators.
If you don't need all 5 Axis of motion you can install firmware on the
FPGA card that has say 4 Step generators and one PWM
generator, typically brought out on the 7I76s 5th axis step/dir pins

In 7i76e, i think there are 6 step/dir outputs for the drives, but i used up 5 for the 5 axis. I want to preserve the remaining one, as in case i need it in future. Instead, somehow, i intent to write a .ngc program to achieve the outputting a simple and rough pwm duty cycle, is it possible? but:..
>there are no time interrupt feature and goto function for use in Linuxcnc programming as what are in arduino and C language, aren't there ?
>the G4 dwell time limits to 1 second at minimum, isn't it, can i write
0.05 second in it?

You can use LinuxCNCs software PWM component running at the servo
thread rate to generate PWM if you don't need high resolution or a high
base frequency.

man pwmgen

Hello everyone.
I have a 7i76 board and I don't use the step 5 generator, and I also have several free outputs.
What is the firmware on the FPGA board that has 4 step generators and a PWM generator. And how to install it on the 7i76 board.

Do you have a 7I76 or 7I76E?
 
For a 7I76E, you would use 7i76e_7i76x1pD.bit firmware which
replaces the last stepgen with a PWMGen.

If you have a 7I76 + a FPGA card, the firmware depends on the
FPGA card used.

In either case, you use the mesaflash utility to update the firmware.
 

Thanks for answering.
I have a 5i25 + 7i76 card
Updated to LinuxCNC 2.9.

5i25_7i76x2_2pd.bit

Would be the correct firmware, This is in the 5i25.zip file from Mesa
 to write the firmware to a 5i25 card you would unzip the 5i25.zip archive
then cd to the new configs/hostmot2/ directory, and run this command:

sudo mesaflash --device 5i25 --write 5i25_7i76x2_2pd.bit --reload