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XC16X: No extern interrupt on Port9.2

Rainer Birkner

Hi, I use an XC164CM controller (on a Infineon Evalboard). My problem is, thats not possible to start an extern interrupt (EX4IN) on Portpin P9.2.
The register values are correct for the simulation with µVision3. Probably I have a hardware problem.
The positive trigger edge is from a 74LS00. But the controller can't detect the edge and no interrupt is started.
Some ideas?
Kindly regards
Rainer

Parents
  • 0

    Could you confirm the values you wrote to registers EXISEL1 and EXICON?

    These are protected registers and if wrote to them after reaching the main routine (EINIT instruction has been executed) then the write was ignored.

    This could also explain why it works with the simulator and not on real hardware.

    Anyway that would be my best guess...

    Best regards
    -Chris

Reply
  • 0

    Could you confirm the values you wrote to registers EXISEL1 and EXICON?

    These are protected registers and if wrote to them after reaching the main routine (EINIT instruction has been executed) then the write was ignored.

    This could also explain why it works with the simulator and not on real hardware.

    Anyway that would be my best guess...

    Best regards
    -Chris

Children
  • 0 in reply to Chris Wunderlich

    Hi Chris,

    here are the values but I think its not the reason because the interrupts (EX4INT and CAPCOM2_Timer7) work at the hardware with my small terminalprogram.
    Only the trigger edge on P9.2 doesnt start the EX4INT interrupt.

    #define CC1_CC12INT 0x1c

    void EX4INT_init (void)
    { EXISEL0 = 0x0000; EXISEL1 = 0x0001; EXICON = 0x0100; CC1_CC12IC = 0x0000; // now disabled; // 0x0048 enable
    }

    void EX4INT (void) interrupt CC1_CC12INT using _FAST_BANK2_ // EX4IN
    { // input from P9.2 printf("trigger..\n");
    }

    // Set Port 9 Direction Control P9.2 Input
    DP9 &= 0xFFFB;
    // Alternate I/O Source Port 9 Selection
    ALTSEL0P9 |= 0x0000;
    ALTSEL1P9 |= 0x0000;

  • 0 in reply to Rainer Birkner

    Hi Chris,

    yes - this was the solution, much thanks!
    Rainer

    Here is the code snippet from Infineon(DAvE):
    void UnlockProtecReg(void)
    { uword uwPASSWORD;

    if((SCUSLS & 0x1800) == 0x0800) // if low protected mode {

    uwPASSWORD = SCUSLS & 0x00FF; uwPASSWORD = (~uwPASSWORD) & 0x00FF; SCUSLC = 0x8E00 | uwPASSWORD; // command 4

    } // end if low protected mode

    if((SCUSLS & 0x1800) == 0x1800) // if write protected mode { SCUSLC = 0xAAAA; // command 0 SCUSLC = 0x5554; // command 1

    uwPASSWORD = SCUSLS & 0x00FF; uwPASSWORD = (~uwPASSWORD) & 0x00FF;

    SCUSLC = 0x9600 | uwPASSWORD; // command 2 SCUSLC = 0x0800; // command 3; new PASSWOR is 0x00

    uwPASSWORD = SCUSLS & 0x00FF; uwPASSWORD = (~uwPASSWORD) & 0x00FF; SCUSLC = 0x8E00 | uwPASSWORD; // command 4

    } // end if write protected mode
    }

  • 0 in reply to Rainer Birkner

    Please read the instructions for how to post code on this forum. They are not hard to find. Just two lines above the text box where you enter your message.

    The code you have posted is unreadable!

  • 0 in reply to ImPer Westermark

    Sorry,

    void UnlockProtecReg(void)
{
  uword uwPASSWORD;
  if((SCUSLS & 0x1800) == 0x0800)      // if low protected mode
  {
    uwPASSWORD = SCUSLS & 0x00FF;
    uwPASSWORD = (~uwPASSWORD) & 0x00FF;
    SCUSLC = 0x8E00 | uwPASSWORD;      // command 4
  }  // end if low protected mode
  if((SCUSLS & 0x1800) == 0x1800)      // if write protected mode
  {
    SCUSLC = 0xAAAA;                   // command 0
    SCUSLC = 0x5554;                   // command 1
    uwPASSWORD = SCUSLS & 0x00FF;
    uwPASSWORD = (~uwPASSWORD) & 0x00FF;
    SCUSLC = 0x9600 | uwPASSWORD;      // command 2
    SCUSLC = 0x0800;                   // command 3; new PASSWOR is 0x00
    uwPASSWORD = SCUSLS & 0x00FF;
    uwPASSWORD = (~uwPASSWORD) & 0x00FF;
    SCUSLC = 0x8E00 | uwPASSWORD;      // command 4
  }  // end if write protected mode
}

    Thanks all for help!
    Rainer