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20MHz 100 pin megaAVR? ARM HW fp?
All the Cortex-M4F floating point core instruction cycle timings are published in the technical reference manual (cached copy because the ARM website is on the fritz at the time...
Saturday, 31 August 2013 - 21:36
WHILE loop
clawson wrote:You seem to be ignoring David's advice. Use a proven TWI library. If Boolean algebra is still causing the OP this much problem it's better to focus on learning the...
Monday, 12 August 2013 - 14:54
Choice of oscilloscope
Check out the EEVblog forum, the test equipment board is full of oscilloscope talk. Dave Jones of EEVblog has also done video reviews of many of the cheap DSOs, and the current...
Sunday, 11 August 2013 - 20:01
WHILE loop
If you want to wait until either pin (or both) go low, use AND - ie. wait while P1 is high AND P2 is high. Using OR means the wait condition is true until both pins are low.
Sunday, 11 August 2013 - 12:57
Graphics Programming
Older (1980s-90s) graphics textbooks such as Hearn and Baker's "Computer Graphics" should have pretty thorough coverage of drawing algorithms. You can probably pick them up second...
Saturday, 10 August 2013 - 18:00
Designing to pass EMI testing requirements.
Torby wrote:I have an article by Earl McCune, Consultant, and David Wyskiel, Wyskiel Technologies in a PDF, but annoyingly, search engines don't want to give you a link to the pdf...
Wednesday, 7 August 2013 - 12:05
trying to disassemble and am super confused...
Kartman wrote:There's some ics not listed. u8 for example. It has a 400MHz oscillator nearby. The parts list plays fast and loose with units. The "600MHz" USB oscillator is pretty...
Wednesday, 7 August 2013 - 11:39
trying to disassemble and am super confused...
Pretty sure the main CPU is U8, which has an Atmel logo on it. It's not included in the parts list either.
Wednesday, 7 August 2013 - 11:35
Unused computed value
david.prentice wrote:You could equally well say: dummy = SPSR; In fact this is safer. Some compilers won't translate the "SPSR;" properly. Dunno about portability, but I...
Thursday, 1 August 2013 - 21:05
ARM MCU (SAMD20)
bobgardner wrote:I find it somewhat unbelievable that an instruction set that doesn't have a call and return would become so popular. What's so special about them? The "branch-and...
Saturday, 29 June 2013 - 16:33
ARM MCU (SAMD20)
westfw wrote:The clock system is not considered part of the cortex cores, is it? It's more of a vendor-specific peripheral. That is correct. The interrupt controller, core timer...
Saturday, 29 June 2013 - 11:20
ARM MCU (SAMD20)
hobbss wrote:I think if I can find a good tutorial on arm/m0+ in general, I should be able to use the register descriptions in the SAMD20 data sheet to write my code. For learning...
Friday, 28 June 2013 - 07:57

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