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arria v ds-5 arm compiler inline assembly

bsp_user
初學者
2,294 檢視

Hi,

I try to read the cntfreq register in arria V evaluation board , ds-5 arm compiler 5.

I use the following line:

 

__asm volatile("mrc p15, 0, %0, c14, c0, 0" : "=r" (val)));

 

compilation failed with #18: expected a ")"

 

whar am I dong wrong?

 

 

thanks

0 積分
1 解決方案
Jeet14
員工
2,080 檢視

Hi,


compiler v7 can have the single line syntax like below-


__asm("[;]");

__asm{[;]}


for reading CNTFREQ, assign global variable with volatile.

And try to run again,


volatile unsigned int freq=0;


void printReg()

{

__asm

{

mrc p15, 0, freq, c14, c0, 0

}

printf("freq=0x%X", freq);

}


let me know if you have any query on this.


Regards

Jeetesh



在原始文章中檢視解決方案

7 回應
Jeet14
員工
2,274 檢視

Hi,


Its seems error in the syntax used-

remove the one closing ) from the syntax.


Regards

Tiwari


bsp_user
初學者
2,249 檢視

I apologies, I wrote it here wrong.

 

 

I encountered two issues:

 

1. I tried to use "regular" syntax which I saw in other places as well and it didn't work.

(1.png)

I don't know what is wrong with this syntax.

 

 

2. I tried another syntax (2.png). now the code compiles but I have two problems:

- There is no volatile statement

- When I execute this asm code via debugger it halts when it reaches the asm code and that's it (I don't see the print value and can't continue to next step or running the debugger)

 

 

Thank you

 

 

Jeet14
員工
2,201 檢視

Hi,


Can you try changing your first syntax by below-

__asm__ volatile("mrc p15, 0, %0, c14, c0, 0" : "=r" (freq));


Regards

Tiwari


bsp_user
初學者
2,113 檢視

this is not working as well (the syntax).

is it valid to arm compiler v5?

Jeet14
員工
2,168 檢視

Hi,

 

If you have any other question on the matter, please let me know.

 

Regards

Jeetesh


bsp_user
初學者
2,113 檢視

I replied to your previous message above. Thank you for your help

Jeet14
員工
2,081 檢視

Hi,


compiler v7 can have the single line syntax like below-


__asm("[;]");

__asm{[;]}


for reading CNTFREQ, assign global variable with volatile.

And try to run again,


volatile unsigned int freq=0;


void printReg()

{

__asm

{

mrc p15, 0, freq, c14, c0, 0

}

printf("freq=0x%X", freq);

}


let me know if you have any query on this.


Regards

Jeetesh



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