#include <intrins.h>
void test_nop (void) {
P1 = 0xFF;
_nop_ (); /* delay for hardware */
_nop_ ();
_nop_ ();
P1 = 0x00;
}
how i can do this function by codevisionavr ? is it possible?
in this code Says that nop() make delay for hardware
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What does the CodeVision documentation tell you ... ?
What is the source of this code?
My guess is it sets a port bit (p1 = 0xFF;)
then delay's using nop's.
then clears a port bit (p1=0;)
An oscilloscope or logic analyzer connected to that port pin would show a short blip.
A similar function in any c compiler should be trivial if you know your target cpu and compiler.
Jim
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In CV, you would use inline assembler. (if you investigate intrins.h you will also probably find macros for inline assembler)
A single-line inline assembler in CV is explained in the documentation. Example of use:
for (looper = 0; looper < ADC_CHANNELS; looper++)
{
#asm("cli");
adc_total[looper] += adc_raw[looper];
#asm("sei");
}
In your case you would probably want #asm("nop");
If you care to, you could wrap that in a #define called _nop_ or whatever you like.
awneil wrote:
+1
Looks like 8051 and Keil C51 ...
i want to work with atmega32 and codevision error while running this code
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karimi4511 wrote:
error while running this code
I presume you mean that you get errors when you build this code?
This is bound to be the case - because the code is for an entirely different type of chip (an 8051, not an AVR), and relies upon the proprietary extensions of an entirely different compiler (Keil, not CodeVision)!!
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karimi4511 wrote:
Why do you think some code for 8051 is in any way relevant to the AVR? As other have said there are ways to put ASm opcodes in C in Codevision: #asm("NOP") or whatever but maybe an 8051 needs NOPs in some places where nothing in the AVR hardware actually does. So it seems like a very "low level" thing to be trying to port. I would look at the higher level view of things and see if the complete job you are trying to achieve in AVR code is in any way similar to the equivalent 8051 code (seems unlikely).
i want to work with atmega32 and codevision error while running this code
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clawson wrote:
Why do you think some code for 8051 is in any way relevant to the AVR?
Maybe this explains why the OP did not seem to grasp your point (repeated by others) in his/her other thread about reading make & model from a chip ...
EDIT
Link: https://www.avrfreaks.net/comment...
Last Edited: Thu. Dec 14, 2017 - 03:55 PM
karimi4511 wrote:
#include <intrins.h> void test_nop (void) { P1 = 0xFF; _nop_ (); /* delay for hardware */ _nop_ (); _nop_ (); P1 = 0x00; }
how i can do this function by codevisionavr ? is it possible?
Another way to do this, without NOPs, would be
P1 = 0xFF; P1 = 0xFF; /* repeat for as long as you want the pulse hi */ P1 = 0xFF; /* assuming P1 declared 'volatile', these won't be optimized out */ P1 = 0x00;
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clawson wrote:
What if P1 in an 8051 is like PINB in a Mega 328? ;-)
Then OP will come to understand why anybody working with uCs needs a scope. :)