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The Lurker Returns!	by LongFist	2008-08-28 13:11:45
Thread jack: regarding post	by EnzoMatrix	2011-11-07 23:55:38
Thanks. Let me tell you about it...	by LongFist	2011-11-08 08:46:33
A few comments from a EE who hacks firmware...	by AndyA	2011-11-08 09:37:32
'only' 1 KHz..? =)	by EnzoMatrix	2011-11-09 00:53:29
A/D converts speed would be the limiting issue ;-)	by AndyA	2011-11-09 10:03:32
A polling loop would normally be at least 4 instructions in assembler which means 2.5MHz max. More importantly it means the time taken to respond will be anywhere between 1 and 4 instruction cycles with no method of knowing how long. That indeterminate nature can be a killer at times. Interrupts aren't instant and response time can vary depending what the CPU is doing but if you give it a high priority on something simple like an AVR it will generally be far better than any polling loop could be. With the added benefit that you don't need your cpu sitting in a loop doing nothing useful for it to work. Sure it's only 20MHz but things like timers, A/D captures etc... can all take place in the background with zero CPU cost once you have configured them. All you get is an interrupt once the task is done and the data is ready. Things like the AVR and PIC also have very active communities. Like I said, they have their place. If you want to do a one off thing and never touch a micro controller again then they are great. If on the other hand you want to gain experience in how real world products are developed then it's worth learning on the real thing.
[ Reply ]
Ah, to play with the real thing...	by LongFist	2011-11-10 09:58:41
So far anything analog I've done on	by EnzoMatrix	2011-11-11 00:13:33
Well, this project is really straightforward,	by LongFist	2011-11-11 07:02:17
They actually invented a chip to read thermo-	by EnzoMatrix	2011-11-14 00:02:36

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