Lpc2000

Hi,

someone can help me to notice because the following happens:

I have 3 PWM (of accelerometers ADXL202E)with periods of more or less
100Hz and I want to measure the duty cycle. If I only enable 2 of the
3 interruptions that pretend everything works well, but if I enables
the third interruption the results are not the expected (the duty
cycle have errors, for example I'm an duty cycle of 0.50 and once in a
while appear pick 1.5).

I'm using LPC2129 and the GCC 3.4.1 compiler for ARM.


T1CCR |= TCCR_CR0_I | TCCR_CR0_R | TCCR_CR0_F; // enable timer1
interrupt on rising edge of CR0 capture (eixo dos xx)

T1CCR |= TCCR_CR1_I | TCCR_CR1_R | TCCR_CR1_F;

T1CCR |= TCCR_CR2_I | TCCR_CR2_R | TCCR_CR2_F;



//interrupt function

void captura(void){
   ISR_ENTRADA();
			
		
	if(T1IR & TIR_CR0I){		
	   T1IR |= TIR_CR0I;
	    
	    acel_cap_eixo_x();

	}

	if(T1IR & TIR_CR1I){		
	   T1IR |= TIR_CR1I;

	   acel_cap_eixo_y();

	}

	if(T1IR & TIR_CR2I){		
	   T1IR |= TIR_CR2I;			

	  acel_cap_eixo_z();

	}

	VICSoftIntClr = (1<<VIC_TIMER1);


	VICVectAddr = 0x00000000;             // clear this interrupt from
the VIC
	ISR_SAIDA();                           // recover registers and return
}





void acel_cap_eixo_x(void){
	u32 tpu; 
	
	if(IOPIN0 & ACEL_asc_x){	//verify rising edge
	   tpu=T1CR0;
           INS_ACEL_ESCREVE(0,
((ACEL_T2_x-ACEL_T1_x)<<14)/(tpu-ACEL_T1_x));
	   
           ACEL_T1_x=tpu;
		
	}else{			//falling edge
	   ACEL_T2_x = T1CR0;
		
	      	}
return;
}

...
...


#define  ACEL_BUFFER_TAM  8
#define  ACEL_BUFFER_MASK  0x07

static u32   	ACEL_BUFFER[3][ACEL_BUFFER_TAM+1];
static unsigned char	ACEL_BUFFER_ESC[3];


char INS_ACEL_ESCREVE(char eixo, u32 valor){
	
	if( (ACEL_BUFFER_ESC[eixo]+1)&ACEL_BUFFER_MASK ==
ACEL_BUFFER_LER[eixo] ) 
		return -1;
		
	ACEL_BUFFER[eixo][ACEL_BUFFER_ESC[eixo]]=valor;
	ACEL_BUFFER_ESC[eixo]++;
	
	if(ACEL_BUFFER_ESC[eixo]>ACEL_BUFFER_TAM){
		ACEL_BUFFER_ESC[eixo]=0;
	}

Thanks 
      Domingos
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