Posted on May 17, 2011 at 14:20No sources except to say learn the processor and think.
You have a timer that generates pulses. You want to trigger ADC conversion events synchronized to your pulse generation. If a CC on the timer is available to make trigger generation easier use it. If not, use another timer and keep them running together. Or use external hardware to pull a line that triggers ADC conversion.
Life gets tricky if you need to vary the PWM frequency.
On the subject of Software Design Specifications: don’t make the mistake of specifying something that can’t be implemented. Mr. PICguy recommends actually implementing the hard parts to prove that they can, in fact, be done. And that you can do it.
If you hired me I would start by understanding what you are trying to accomplish with a Cortex processor. Big picture first. Then all of those parts that involve sensing or controlling external hardware have to fit into the big picture. Do you have enough timers, ADC inputs, GPIO, PWM and whatever to do the big picture. Power budget. Processor clock budget. Cost budget. That kind of stuff.
I am a bottom up software guy. I do critical low-level code first. If the low-level command and control can’t work then the product can’t work. It’s better to know that sooner rather than later.
This the wrong place to recount horror stories of software failure brought on by design decision failure.
Parting platitude: Quality is not about adherence to design documents or specs. Quality is your products’ perception in the mind of the customer.
