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External Interrupt Priority Level Register Cortex M3

Vinayak Ray
Note: This was originally posted on 15th July 2010 at http://forums.arm.com

Hi,
I am trying to program the priority level of external interrupts but without any luck

snippet from the code
-------------------------------------------------------------------------------
#define PRI_3     ((volatile unsigned char *) (0xE000E403))
   *PRI_3 = data;
   __DSB();
------------------------------------------------------------------------------

When I try to read back the data written using

  data = *PRI_3;
  __DSB();

I don't get the expected data
Do I have to set any other registers?

Thanks
Vinayak
Parents
  • Note: This was originally posted on 16th July 2010 at http://forums.arm.com

    Thanks hth.
    I had missed that I could program only MSBs of priority registers.  B)

    What is the value of "data"?

    Depending on the configuration of the Cortex-M3 part in question,
    it may only be possible to write the values 0x00, 0x20, 0x40, 0x60, 0x80, 0xA0, 0xC0 and 0xE0.

    hth
    s.
Reply
  • Note: This was originally posted on 16th July 2010 at http://forums.arm.com

    Thanks hth.
    I had missed that I could program only MSBs of priority registers.  B)

    What is the value of "data"?

    Depending on the configuration of the Cortex-M3 part in question,
    it may only be possible to write the values 0x00, 0x20, 0x40, 0x60, 0x80, 0xA0, 0xC0 and 0xE0.

    hth
    s.
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