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Writing ARM application containing both C code and assemply code

Note: This was originally posted on 6th September 2007 at http://forums.arm.com

Hi I need to put one ARM instruction in ARM application written in C.
Basically my application looks like
void main(void)
{
................
   ................
   enable_IRQ();
   program_dma();   /* programs DMA with st address, dest addr, xfer length etc and enables DMA*/
   /* Here I want to put a ARM instruction(assembly) */
   ..............
}

Extra information:
            After enabling DMA, I want to execute WaitForInterrupt instruction by doing

MCR p15, 0, Rd, c7, c0, 4

Since this is C code I cant directly put that instruction( I guess).
Can you tell me how can I put that MCR instruction in my C code

Top replies

Simon Craske over 12 years ago +1 verified

Note: This was originally posted on 10th September 2007 at http://forums.arm.com Pavan, ARMCC also provides "embedded" assembler which allows simple creation of assembler functions within C source code;...

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0 OnePutt OnePutt over 12 years ago

Note: This was originally posted on 12th September 2007 at http://forums.arm.com

__asm void WFI(void)
{
   MCR p15,0,r0,c7,c0,4; // wait-for-interrupt
   BX lr; // return from function
}

Should I be able to use
__asm
{
   WFI
}

The RVDS compiler does not like this for some reason, but accepts the MCR... line ok. Are these equivalent?
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0 OnePutt OnePutt over 12 years ago

Note: This was originally posted on 12th September 2007 at http://forums.arm.com

__asm void WFI(void)
{
   MCR p15,0,r0,c7,c0,4; // wait-for-interrupt
   BX lr; // return from function
}

Should I be able to use
__asm
{
   WFI
}

The RVDS compiler does not like this for some reason, but accepts the MCR... line ok. Are these equivalent?
Cancel
Vote up 0 Vote down

Cancel

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