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  VS Arduino › Visual Micro › General Board › PROGMEM and Memory Usage
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goge
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PROGMEM and Memory Usage
Sep 30th, 2014 at 10:32pm
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It seems memory usage doesn't take into account strings / values stored in program flash using PROGMEM or the F() macro.

Is there a way to get such strings' memory removed from the Memory Usage count?
  
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Tim@Visual Micro
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Re: PROGMEM and Memory Usage
Reply #1 - Oct 1st, 2014 at 9:01am
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Hi,

The compiler memory indicator works the same way that the Arduino IDE works.

If you have the Plus version of Visual Micro you can switch on the advanced memory report which might help. You can also provide your own switches for the report if required but the default might do what you need. More info here

http://www.visualmicro.com/page/User-Guide.aspx?doc=Project-Properties-Reference...
  
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stevech
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Re: PROGMEM and Memory Usage
Reply #2 - Oct 25th, 2014 at 7:45am
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I looked at the asm code for the mega328 from a large C/C++ program. The GCC compiler does some clever things with the AVR registers. 
But too, I see the 8 bitter struggle with many lines of code just to check if a uint32_t is 0.
On an ARM Cortex, it's one instruction.

that's the way it is.
« Last Edit: Oct 25th, 2014 at 7:45am by stevech »  
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Tim@Visual Micro
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Re: PROGMEM and Memory Usage
Reply #3 - Oct 25th, 2014 at 10:46am
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My knowledge is weak in this area.

What I do know is that an 8 bit processor needs to process each of the 4 bytes (4x8 bits) to make a 32 bit number whereas a 32 bit processor processes bytes in blocks of 4

Not sure it that is an answer  Smiley
« Last Edit: Oct 25th, 2014 at 10:46am by Tim@Visual Micro »  
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stevech
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Re: PROGMEM and Memory Usage
Reply #4 - Dec 13th, 2014 at 7:52pm
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It's too bad that today's ARM micros can't more quickly supersede AVRs - because for newbies, having native ints be 32 bits, and eliminating the PITA/horrid dual address space that AVR and PIC have (Harvard architecture) simplifies so many things, esp. libraries.

I work with ARMs now more than AVR. It's like the difference between driving a 1959 VW and a Lexus, both of which I've owned.

  
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