Wrong Timer Interruption Mplab

Created Thu, 20 Sep 2012 20:17:19 +0000 by Egwyn

Egwyn

Thu, 20 Sep 2012 20:17:19 +0000

Hi Í'm using a max32 with a MPIDE to get an interrupt every 40us, I do it with the following sketch, this is part of the all code.

#include <plib.h>
#include <Time.h>

#define F_m      25000  // 40us
#define Pout1    13       // 

void setup()
{
  pinMode(Pout1,OUTPUT);
  OpenTimer5(T5_ON, F_CPU / F_m);
  ConfigIntTimer5(T5_INT_ON | T5_INT_PRIOR_3);
}

void loop(){}

extern "C"
{
  void __ISR(_TIMER_5_VECTOR,ipl3) Control(void)
  {
      digitalWrite(Pout1,HIGH);
      digitalWrite(Pout1,LOW);
      mT5ClearIntFlag();  // Clear Flag
   }
}

But now I need change it to MPLAB, and I'm using the following code, the problem is that I am getting the interrupt every 400us. Could someone help me find where is my error. thanks

//****************************************************************************************
//* Libs
//****************************************************************************************
#include <string.h>
#include <proc/p32mx795f512l.h>
#include <plib.h>
//****************************************************************************************
//*  PIC32MX795F512L Configuration
//****************************************************************************************
#pragma config FCANIO	= OFF		// Use Alternate Pins for chipKIT MAX32
#pragma config POSCMOD  = HS            // Primary Oscillator
#pragma config FNOSC    = PRI           // Oscillator Selection
#pragma config FPBDIV   = DIV_2         // Peripheral Clock divisor
#pragma config FWDTEN   = OFF           // Watchdog Timer
#pragma config WDTPS    = PS1           // Watchdog Timer Postscale
#pragma config FCKSM    = CSDCMD        // Clock Switching & Fail Safe Clock Monitor
#pragma config OSCIOFNC = OFF           // CLKO Enable
#pragma config IESO     = OFF           // Internal/External Switch-over
#pragma config FSOSCEN  = OFF           // Secondary Oscillator Enable (KLO was off)
#pragma config CP       = OFF           // Code Protect
#pragma config BWP      = OFF           // Boot Flash Write Protect
#pragma config PWP      = OFF           // Program Flash Write Protect
#pragma config ICESEL   = ICS_PGx2      // ICE/ICD Comm Channel Select
#pragma config DEBUG    = ON            // Background Debugger Enable
//*****************************************************************************************
//* DEFINICION DE COSTANTES
//*****************************************************************************************
#define SYSTEM_FRECUENCY    80000000L
#define PBUS_CLOCK          40000000L
#define SAMPLE_RATE         25000
//****************************************************************************************
//* Main 
//****************************************************************************************
int main(void)
{
//****************************************************************************************
//* TUNE-UP 
//****************************************************************************************
        SYSTEMConfigPerformance(SYSTEM_FRECUENCY);   //
        mOSCSetPBDIV( OSC_PB_DIV_2 );
//****************************************************************************************
//*  TIMER5
//****************************************************************************************
	OpenTimer5(T5_ON | T2_PS_1_1, PBUS_CLOCK / SAMPLE_RATE);
	ConfigIntTimer5(T5_ON | T5_INT_PRIOR_3);
	INTEnableSystemMultiVectoredInt();

//****************************************************************************************
//*  Initial States
//****************************************************************************************
	mPORTASetPinsDigitalOut(BIT_3);
	mPORTAClearBits(BIT_3);
}
//****************************************************************************************
//* RUTINA DE INTERRUPCION TIMER5
//****************************************************************************************
void __ISR(_TIMER_5_VECTOR,ipl3)Timer5Handler(void)
{
    mPORTAToggleBits(BIT_3);            //   -------
    asm("nop");                                  //          1
    asm("nop");                                  //          1
    asm("nop");                                  //          1
    asm("nop");                                  //          1
    mPORTAToggleBits(BIT_3);            //   -------
    mT5ClearIntFlag(); // Clear interrupt flag
}

Egwyn

Mon, 24 Sep 2012 17:33:41 +0000

Solved ... It was so stupid, the correct frecuency on board is 8MHz .. ;), just correct that on C and work fine !