Systemclockupdate

I removed systemclockupdate nd i included system init(). Now its working. but am not getting expected result. I need a square wave of ON period of 1ms and OFF period of 15ms, totally 16ms duty cycle. But am getting 16.9ms duty cycle.I duno where it gone wrong..? Can u help me please.

Thank You.

I removed systemclockupdate nd i included system init(). Now its working. but am not getting expected result. I need a square wave of ON period of 1ms and OFF period of 15ms, totally 16ms duty cycle. But am getting 16.9ms duty cycle.I duno where it gone wrong..? Can u help me please.

Thank You.

"I need a square wave of ON period of 1ms and OFF period of 15ms, totally 16ms duty cycle. But am getting 16.9ms duty cycle.I duno where it gone wrong..? Can u help me please."

So must be something wrong with line 123 then.

Per,
Dnt be sarcastic. But the comment was funny.(sic)

Divya,
The prescale value or the match register value is not proper. But that are only my guesses.
Post the code. we cant solve anything without looking at the code.

Oki sir. I ,ll check it out. Anyway i ll show my code.

void TIMER0_IRQHandler (void)
{ if ( LPC_TIM0->IR & (0x1<<0) )
{ LPC_TIM0->IR = 0x1<<0;
timer0_m0_counter++;
if ( ( LPC_TIM0->TCR == TIME_INTERVALmS * 15) )
{ reset_timer( 0 );
enable_timer (0);
LPC_TIM0->MR0 = TIME_INTERVALmS * 1;
LPC_GPIO0->FIOSET|=(1<<21);
LPC_GPIO1->FIOSET = 1<<29;
} if (LPC_TIM0->TC == TIME_INTERVALmS * 1 )
{ reset_timer( 0 );
enable_timer (0);
LPC_GPIO0->FIOCLR|=(1<<21);
LPC_GPIO1->FIOCLR = 1<<29;
LPC_TIM0->MR0 = TIME_INTERVALmS * 15;
} }
if ( LPC_TIM0->IR & (0x1<<1) )
{ LPC_TIM0->IR = 0x1<<1;
timer0_m1_counter++;
} if ( LPC_TIM0->IR & (0x1<<4) )
{ LPC_TIM0->IR = 0x1<<4;
timer0_capture0++;
} if ( LPC_TIM0->IR & (0x1<<5) )
{ LPC_TIM0->IR = 0x1<<5;
timer0_capture1++;
} return;
}

uint32_t init_timer ( uint8_t timer_num, uint32_t TimerInterval )
{ uint32_t pclkdiv, pclk;
if ( timer_num == 0 )
{ timer0_m0_counter = 0;
timer0_m1_counter = 0;
timer0_capture0 = 0;
timer0_capture1 = 0;
LPC_SC->PCONP |= (0x01<<1);
#if TIMER_MATCH
LPC_PINCON->PINSEL3 &= ~((0x3<<24)|(0x3<<26));
LPC_PINCON->PINSEL3 |= ((0x3<<24)|(0x3<<26));
#else
LPC_PINCON->PINSEL3 &= ~((0x3<<20)|(0x3<<22));
LPC_PINCON->PINSEL3 |= ((0x3<<20)|(0x3<<22));
#endif
LPC_TIM0->IR = 0x0F;
pclkdiv = (LPC_SC->PCLKSEL0 >> 2) & 0x03;
switch ( pclkdiv )
{ case 0x00:
default:
pclk = SystemFrequency/4;
break;
case 0x01:
pclk = SystemFrequency;
break;
case 0x02:
pclk = SystemFrequency/2;
break;
case 0x03:
pclk = SystemFrequency/8;
break;
} LPC_TIM0->PR = pclk/1000000; /* set prescaler to get 1 M counts/sec */
LPC_TIM0->MR0 = TIME_INTERVALmS * 15; /* Set up 15 mS interval */
#if TIMER_MATCH
LPC_TIM0->EMR &= ~(0xFF<<4);
LPC_TIM0->EMR |= ((0x3<<4)|(0x3<<6));
#else
/* Capture 0 and 1 on rising edge, interrupt enable. */
LPC_TIM0->CCR = (0x1<<0)|(0x1<<2)|(0x1<<3)|(0x1<<5);
#endif
LPC_TIM0->MCR = (0x3<<0); //|(0x3<<3); /* Interrupt and Reset on MR0 and MR1 */
NVIC_EnableIRQ(TIMER0_IRQn);
return (TRUE);
}

Please help me where i done mistake...

Thank You.