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Re: PBP command execution time
@8mhz each instruction takes 0.5uS what you are looking at there are macro's you need the asm to see the actual code
it wood go something like
mainloop:
movf 0fh,w
movwf trisa
movf 1,w
movwf porta
movf 0,w
movwf porta
goto mainloop
ps pbp probably sticks a clrwdt in there somewhere too
Last edited by richard; - 16th December 2014 at 03:47. Reason: ps
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Re: PBP command execution time
I found this by looking for mainloop in the LST file:
A lot more going on before and after that snippet.Code:... 00086 LABEL?L _mainloop M RST?RP M if (PREV_ALT != 0) M bcf WDTCON, ADSHR M PREV_ALT = 0 M endif M if (PREV_BANK != 0) M movlb 0 M PREV_BANK = 0 M endif M ifdef PM_USED M LALL M _mainloop M XALL M else 000074 M _mainloop M endif 00087 MOVE?CB 0FCh, TRISA M CHK?RP TRISA M if (((TRISA) & 8000h) != PREV_ALT) M if ((TRISA) & 8000h) M bsf WDTCON, ADSHR M else M bcf WDTCON, ADSHR M endif M PREV_ALT = (TRISA) & 8000h M endif M if ((((TRISA) & 0fffh) > BANKA_END) & (((TRISA) & 0fffh) < (0f01h + BANKA_END))) M if (((TRISA) & 0f00h) != (PREV_BANK << 8)) M movlb high (TRISA) M PREV_BANK = high (TRISA) M endif M endif M if (low (0FCh) == 0) M clrf TRISA M else M if (low (0FCh) == 255) M setf TRISA M else 000074 0EFC M movlw low (0FCh) 000076 6E92 M movwf TRISA M endif M endif MPASM 5.49 BLINK1~1.ASM 12-15-2014 22:49:14 PAGE 15 LOC OBJECT CODE LINE SOURCE TEXT VALUE 00088 MOVE?CB 001h, PORTA M CHK?RP PORTA M if (((PORTA) & 8000h) != PREV_ALT) M if ((PORTA) & 8000h) M bsf WDTCON, ADSHR M else M bcf WDTCON, ADSHR M endif M PREV_ALT = (PORTA) & 8000h M endif M if ((((PORTA) & 0fffh) > BANKA_END) & (((PORTA) & 0fffh) < (0f01h + BANKA_END))) M if (((PORTA) & 0f00h) != (PREV_BANK << 8)) M movlb high (PORTA) M PREV_BANK = high (PORTA) M endif M endif M if (low (001h) == 0) M clrf PORTA M else M if (low (001h) == 255) M setf PORTA M else 000078 0E01 M movlw low (001h) 00007A 6E80 M movwf PORTA M endif M endif 00089 MOVE?CB 002h, PORTA M CHK?RP PORTA M if (((PORTA) & 8000h) != PREV_ALT) M if ((PORTA) & 8000h) M bsf WDTCON, ADSHR M else M bcf WDTCON, ADSHR M endif M PREV_ALT = (PORTA) & 8000h M endif M if ((((PORTA) & 0fffh) > BANKA_END) & (((PORTA) & 0fffh) < (0f01h + BANKA_END))) M if (((PORTA) & 0f00h) != (PREV_BANK << 8)) M movlb high (PORTA) M PREV_BANK = high (PORTA) M endif M endif M if (low (002h) == 0) M clrf PORTA M else M if (low (002h) == 255) M setf PORTA M else 00007C 0E02 M movlw low (002h) 00007E 6E80 M movwf PORTA M endif M endif 00090 MOVE?CB 0F3h, TRISA MPASM 5.49 BLINK1~1.ASM 12-15-2014 22:49:14 PAGE 16 LOC OBJECT CODE LINE SOURCE TEXT VALUE M CHK?RP TRISA M if (((TRISA) & 8000h) != PREV_ALT) M if ((TRISA) & 8000h) M bsf WDTCON, ADSHR M else M bcf WDTCON, ADSHR M endif M PREV_ALT = (TRISA) & 8000h M endif M if ((((TRISA) & 0fffh) > BANKA_END) & (((TRISA) & 0fffh) < (0f01h + BANKA_END))) M if (((TRISA) & 0f00h) != (PREV_BANK << 8)) M movlb high (TRISA) M PREV_BANK = high (TRISA) M endif M endif M if (low (0F3h) == 0) M clrf TRISA M else M if (low (0F3h) == 255) M setf TRISA M else 000080 0EF3 M movlw low (0F3h) 000082 6E92 M movwf TRISA M endif M endif 00091 MOVE?CB 004h, PORTA M CHK?RP PORTA M if (((PORTA) & 8000h) != PREV_ALT) M if ((PORTA) & 8000h) M bsf WDTCON, ADSHR M else M bcf WDTCON, ADSHR M endif M PREV_ALT = (PORTA) & 8000h M endif M if ((((PORTA) & 0fffh) > BANKA_END) & (((PORTA) & 0fffh) < (0f01h + BANKA_END))) M if (((PORTA) & 0f00h) != (PREV_BANK << 8)) M movlb high (PORTA) M PREV_BANK = high (PORTA) M endif M endif M if (low (004h) == 0) M clrf PORTA M else M if (low (004h) == 255) M setf PORTA M else 000084 0E04 M movlw low (004h) 000086 6E80 M movwf PORTA M endif M endif 00092 MOVE?CB 008h, PORTA M CHK?RP PORTA MPASM 5.49 BLINK1~1.ASM 12-15-2014 22:49:14 PAGE 17 LOC OBJECT CODE LINE SOURCE TEXT VALUE M if (((PORTA) & 8000h) != PREV_ALT) M if ((PORTA) & 8000h) M bsf WDTCON, ADSHR M else M bcf WDTCON, ADSHR M endif M PREV_ALT = (PORTA) & 8000h M endif M if ((((PORTA) & 0fffh) > BANKA_END) & (((PORTA) & 0fffh) < (0f01h + BANKA_END))) M if (((PORTA) & 0f00h) != (PREV_BANK << 8)) M movlb high (PORTA) M PREV_BANK = high (PORTA) M endif M endif M if (low (008h) == 0) M clrf PORTA M else M if (low (008h) == 255) M setf PORTA M else 000088 0E08 M movlw low (008h) 00008A 6E80 M movwf PORTA M endif M endif 00093 GOTO?L _mainloop M L?GOTO _mainloop ...
Robert
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Re: PBP command execution time
that why your own asm routines are often used , if you know every thing is in the same mem bank then ALL that bank ckecking (chk:rp) can be eliminated ,but what you have there is a lst file I would expect any decent compiler to optimise most if not all that unnecessary code out , the assembled file should look cleaner than that, but need to disassemble the hex file to see it
Last edited by richard; - 16th December 2014 at 04:10.
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Re: PBP command execution time
When I look in the folder where I compile, I see that ASM file I copied above, plus BAS, HEX, LST, MAC and O files.
I don't see a "trimmed" assembler file.
Robert
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Re: PBP command execution time
my badWhen I look in the folder where I compile, I see that ASM file I copied above, plus BAS, HEX, LST, MAC and O files.
I really meant the actual assembled code ---- you need a disassembler to see what really happened
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Re: PBP command execution time
So Darryl must have been using a development tool to know exactly what was going on in the background?Originally Posted by richard
Robert
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Re: PBP command execution time
each instruction takes 4 clock cycles . a clock cycle is 1/8000000 = 125nS therefore 1 instruction = 4*125 nS = 0.5uSHow do we get calculate 0.5uS again? I never remember how to do that. I'm sure the datasheet comes into play.
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Re: PBP command execution time
Unless I can't use a Saleae probe properly, each asm macro ran in 1uS (4uS for one pass). That's not bad considering the chunk of asm in there.
Robert
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Re: PBP command execution time
means the compiler is making nicely optimised codeeach asm macro ran in 1uS (4uS for one pass). That's not bad considering the chunk of asm in there.
I'm sure dt would have had some nice tools , my disassembler won't function any longer it steeps back to windows98 days , but since I gave up hand assembly its not missed that much .
imho most compliers do a reasonable job except maybe the free version of xc8 which is apparently deliberately de-optimised
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Re: PBP command execution time
I think you're not using it properly. As far as I can see you have the sampling rate set to 4Mhz, so there's no way the logic analyzer is going to resolve anythning shorter than 1us. Increase the sampling rate and see if it makes any difference.Unless I can't use a Saleae probe properly, each asm macro ran in 1uS (4uS for one pass). That's not bad considering the chunk of asm in there.
By the way, these chk:rp macro things, aren't those assembler macros, ie they check, at compile time, if there's a need to switch banks and only then actually inserts the code? Ie, chk:rp isn't runtime code, it's assembly time code.
/Henrik.
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Re: PBP command execution time
How do we get calculate 0.5uS again? I never remember how to do that. I'm sure the datasheet comes into play.
Yup, right after the GOTO at the bottom....ps pbp probably sticks a clrwdt in there somewhere too
Robert
My Creality Ender 3 S1 Plus is a giant paperweight that can't even be used as a boat anchor, cause I'd be fined for polluting our waterways with electronic devices.
Not as dumb as yesterday, but stupider than tomorrow!
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