How to write assemble programs in IDE without loop.

v_a_kulkarni — Sat, 24 Dec 2016 05:18:17 GMT

Hi, I have executed following code.

int main(void) {
__asm(
"MOV R1,#0X00\n\r"
"loop: AND R1,R1,#0xFFFFFFFF\n\r"
" NOP\n\r"
" NOP\n\r"
"BL loop"

I want to execute only 04 instructions MOV AND NOP NOP. How to do this? With loop instruction, program will be executed repeatedly. I want to stop after executing 04 instructions. With this I can measure average current taken to execute these 04 instructions.

Re: How to write assemble programs in IDE without loop.

converse — Sat, 24 Dec 2016 08:57:41 GMT

To stop execution, set a breakpoint on the BL instruction. An alternative may be to use a WFI instruction, which will 'sleep' the processor (until an interrupt).

However, I think what you are trying to do is a waste of time, unless you have some very very expensive measuring equipment - assuming your core is running at a sensible speed (25MHz, 100MHz?) then the 4 instructions you are trying to measure will execute so quickly, you will will not see anything measurable (at 100MHz, 4 instructions will take 40nS.

LPCXpresso IDEのトピックRe: How to write assemble programs in IDE without loop.

How to write assemble programs in IDE without loop.

Re: How to write assemble programs in IDE without loop.