| Author | beginning argument ( Replies received: 1 ) |
| willnick55 |
 Posted 28-08-2008 at 20:57 |
Registered on :
08-28-2009
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Hi,
This is my first posting here. I am an analogue engineer really but have recently started using an ST7 in a regulator application. I am a software novice.
I was getting on ok with the project until I started getting glitches in the PWM output, with long pulses being produced. This was tracked down to the fact I was setting the ATR value at the same time an a compare occured, now and then.
The solution to this I am told is to use an interrupt to syncronize setting ATR to the overflow of the counter.
However I have been trying this and using Interruot 9 is causing problems. The ATR values is incremented and the frequency output is increased until the frequency increase stops (at too low a frequency) and the programme malfunctions.
I have no idea why this is happening and hope someone can spot the problem.
Thanks,
Nick
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| willnick55 |
Posted 29-08-2008 at 19:13 |
Registered on :
08-28-2009
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I think this is happening due to time delays in the interrupt routine. The PWM timers runs up to about 90Kz, then stops. I was trying to get up to 300KHz.
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Ultralit Interrupt problems