• State Accepted Answer
  • +1 person also asked this people also asked this
  • Locked Locked
  • Replies 10 replies
  • Subscribers 350 subscribers
  • Views 8392 views
  • Users 0 members are here
2025 survey

We are running a survey to help us improve the experience for all of our members. If you see the survey appear, please take the time to tell us about your experience if you can.

Options
Related
How was your experience today?
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

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 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


    hi

    The ARM C compilers support inline assembly language with the __asm specifier.

    you can use the following code for writing assembly code in C code

    void program_dma()

    {

    __asm
    {
    MCR p15, 0, Rd, c7, c0, 4
    }

    }
    you can use any number of instructions inside the brackets

    regards,
    Rajesh
Reply
  • 0
    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


    hi

    The ARM C compilers support inline assembly language with the __asm specifier.

    you can use the following code for writing assembly code in C code

    void program_dma()

    {

    __asm
    {
    MCR p15, 0, Rd, c7, c0, 4
    }

    }
    you can use any number of instructions inside the brackets

    regards,
    Rajesh
Children
No data