Pulsing object here
Graham Stabler
Posts: 2,510
I posted this in a thread on using waitcnt in assembly but thought it might be of more general use as it shows how to do several things I didn'tknow how to do before I wrote it.
The object takes a pin number an on-time and an off-time in clock cycles and produces pulses on that pin with those parameters. There are also methods to modify the times as it runs.
It demonstrates:
* an assembly based object
* passing a pointer to global variables in main ram to the cog
* accessing those variables within assembly
* changing those variables with other methods and from other cogs
The demo program is a simple texted based interface that can output to a TV or VGA (with suggested modifications). It is really easy to knock up programs that will produce PWM etc by setting the on-time+off-time = period and then incrememting one as you decrement the other.
Its really simple actually but I hope my copius comments will help beginners as they helped me when writing it.
Cheers,
Graham
p.s. I cleaned out some random code from the previous version I posted.
The object takes a pin number an on-time and an off-time in clock cycles and produces pulses on that pin with those parameters. There are also methods to modify the times as it runs.
It demonstrates:
* an assembly based object
* passing a pointer to global variables in main ram to the cog
* accessing those variables within assembly
* changing those variables with other methods and from other cogs
The demo program is a simple texted based interface that can output to a TV or VGA (with suggested modifications). It is really easy to knock up programs that will produce PWM etc by setting the on-time+off-time = period and then incrememting one as you decrement the other.
Its really simple actually but I hope my copius comments will help beginners as they helped me when writing it.
Cheers,
Graham
p.s. I cleaned out some random code from the previous version I posted.
