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Writing ARM application containing both C code and assemply code

Pavan Kumar
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
Parents
  • 0
    Note: This was originally posted on 14th September 2007 at http://forums.arm.com

    I am working on an ARM7TDMI - I thought this supported the full Thumb 2 instruction set.  Perhaps the compiler does not support Thumb 2...

    Looks like ARM7 does not support Thumb 2 - is there any equivalent fucntionality on ARM7 or do I require external circuitry to go into a low power mode?
Reply
  • 0
    Note: This was originally posted on 14th September 2007 at http://forums.arm.com

    I am working on an ARM7TDMI - I thought this supported the full Thumb 2 instruction set.  Perhaps the compiler does not support Thumb 2...

    Looks like ARM7 does not support Thumb 2 - is there any equivalent fucntionality on ARM7 or do I require external circuitry to go into a low power mode?
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