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Keil u vision and code composer studio with lm3s8962

Xingjun

Hi Community,

I have a set of FFT codes that is suppose to create an array of number after processing the incoming signal.

When I build my codes in code composer studio it was successfully built.

However, when I run it on debug mode it face problems.

The purpose of my project is to simply program a set of FFT algorithm in c, and allow my LM3s8962 micro-controller to process the incoming signal(Voice or sound).

I have another question, can I use the algorithm to run it in my keil uvision, since the keil uvision has the spectrum/logic analyser which I can see the frequency spectrum.

I will attach my algorithms here, if any kind hearted soul spot any mistakes in my algorithm please enlighten me.

/*
* main.c
*/
#include <stdio.h>
#include <math.h>
#include <stdbool.h>
#include <stdint.h>
#include "inc/hw_memmap.h"
#include "inc/hw_types.h"
#include "inc/hw_ints.h"
#include "driverlib/sysctl.h"
#include "driverlib/adc.h"
#include "driverlib/interrupt.h"
#include "driverlib/gpio.h"
#include "driverlib/pin_map.h"
#include "grlib/grLib.h"
#include "grlib/grLibDriver.h"

short sample[8];

#pragma vector=unused_interrupts
interrupt void user_trap_function(void)  //ISR to handle the end of sampling interrup, being the only enabled interrupt
{
int df = 15625;      //fs/N = 125000/8
int Re[8];
int Im[8];
int Ampl[8];
int fr[8];
int N = 8;        //number of samples
x[N] = (short)sample;    // convert sample values to short integers for computation
int out[2] = {0,0};      //init Re and Im results
int j=0;
for (j = 0; j < N; j++){
  dft(x,j,out);       //call DFT function
  Re[j] = out[0];
  Im[j] = out[1];      //collect real and imaginary parts
  Ampl[j] = ((Re[j]^2)+(Im[j]^2))^(1/2);
  fr[j] = df*j;

  long lX1 = (long)Ampl[j];
  long lX2 = (long)Ampl[j]+1;
  long lY = (long)fr[j];
  long ulValue = 128;

  void LineDrawH (pvDisplayData, lX1, , lX1, lY, ulValue);

}


}

int M = 0;
unsigned long sample[8]

void LineDrawH (void *pvDisplayData, long lX1, long lX2, long lY, unsigned long ulValue);

void ADC_init( void ) {
  SYSCTL_RCGC0_R |= SYSCTL_RCGC0_ADC;            // Enable the clock to the ADC module
  SYSCTL_RCGC0_R |= SYSCTL_RCGC0_ADCSPD125K;       // Configure the ADC to sample at 125KS/s
  ADCSequenceDisable(ADC_BASE, 0);             // Disable sample sequences 0
  ADCSequenceConfigure(ADC_BASE, 0, ADC_TRIGGER_PROCESSOR, 1);  // Configure sample sequence 0: processor trigger, priority = 1
  IntPrioritySet(INT_ADC0SS0,0);             // Set SS0 interrupt priority to 0
  ADCSequenceStepConfigure(ADC_BASE, 0, 0, ADC_CTL_CH0);  // Configure sample sequence 0 to sample external input
  ADCSequenceStepConfigure(ADC_BASE, 0, 1, ADC_CTL_CH0);
  ADCSequenceStepConfigure(ADC_BASE, 0, 2, ADC_CTL_CH0);
  ADCSequenceStepConfigure(ADC_BASE, 0, 3, ADC_CTL_CH0);
  ADCSequenceStepConfigure(ADC_BASE, 0, 4, ADC_CTL_CH0);
  ADCSequenceStepConfigure(ADC_BASE, 0, 5, ADC_CTL_CH0);
  ADCSequenceStepConfigure(ADC_BASE, 0, 6, ADC_CTL_CH0);
  ADCSequenceStepConfigure(ADC_BASE, 0, 7, ADC_CTL_CH0 | ADC_CTL_IE | ADC_CTL_END); //set interrupt flag after the seventh step
  ADCIntEnable(ADC_BASE, 0);         // Enable the interrupt for sample sequence 0
  IntEnable(INT_ADC0SS0);                   // Enable SS0 Interupt in NVIC
  M+=M;               // integer to detect if ADC is initialized
}

unsigned long getADC0(void)
{

ADCProcessorTrigger(ADC0_BASE, 0);     //initiate sampling
while(!ADCIntStatus(ADC0_BASE, 0, false));   //monitor interrupt flag for completion of sampling
ADCSequenceDataGet(ADC0_BASE, 0, sample);  //assign samples to global variable, sample

return sample;         //return sample to calling function
}

int dft(long *x, short k, int *out)   //DFT function
{
  int sumRe = 0;       //init real component
  int sumIm = 0;      //init imaginary component
  int i = 0;
  int N = 8;
  float pi = 3.1416 ;
  float cs = 0;       //init cosine component
  float sn = 0;       //init sine component
  for (i = 0; i < N; i++)    //for N-point DFT
   {
   cs = cos(2*pi*(k)*i/N);   //real component
   sn = sin(2*pi*(k)*i/N);   //imaginary component
   sumRe += x[i]*cs;     //sum of real components
   sumIm -= x[i]*sn;     //sum of imaginary components
   }
  out[0] = sumRe;      //sum of real components
  out[1] = sumIm;      //sum of imaginary components

  return(out);
}
int main(void) {
if (M>0){
  ADC_init();       //initialize ADC module if not already initialized
}
getADC0();        //start conversion. Interrupt flag will be set after sampling and this functioned called again after ISR executes

return 0;
}