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while(1)
{
if(PWM1IR&0x10==0x10) //Interrupt flag for capture input 0
{
count++;
print count(count);
PWM1IR=0x10;// to clear the Interrupt need to write 1
}
}
---------- Post added at 06:19 ---------- Previous post was at 06:14 ----------
this will work check it
PWM1TCR=0X0B;
PWM1CTCR=0X01
PINSEL4 |=0x00001000;//select pinP2.6 as PCAP1.0
PWMICCR=0X01
while(1)
{
if(PWM1IR&0X10==0X10)
{
count++;
print the count(count);
PWM1IR=0x10;//to reset the Interrupt
}
}
But as i said the interrupt flag "PWMCAP0" is available only in LPC2468(your micrcontroller)
but not in LPC2368(my microcontroller) thats why i m stuck. what flag to check if an event occurs.
But as i said the interrupt flag "PWMCAP0" is available only in LPC2468(your micrcontroller)
but not in LPC2368(my microcontroller) thats why i m stuck. what flag to check if an event occurs.
Dear embedded partner,thanks a lot for all your replies..actually i was using the User manual meant for LPC2364/65/66/67/68 thats why i was facing problem..
but i haven't tested the code because i am designing the hardware.
for testing purpose i am using LM555 to switch a transistor and later pulse from collector to ucontroller pin.
i don't have any knowledge about the type of pulse i will get from the vehicle speed sensor...
the interface in the vehicle(meant for pulse) contains 3 wire red,black and green...
thanks
dear i have tried you code but it didn't work...don't know why...all the settings are ok but still...
my code is:
PINSEL4 |=0x00001000;//select pinP2.6 as PCAP1.0
PWM1TCR=0X02; //bit 0->Counter Enable,bit1->Counter Reset on next pulse
PWM1CTCR=0X01; //Count Control Register. The CTCR selects between Timer and
//Counter mode, and in Counter mode selects the signal and
//edge(s) for counting.
PWM1CCR=0X04; //A synchronously sampled rising edge on the CAPn.0 input
//will cause CR0 to be loaded with the contents of the TC.
PWM1TCR=0X01; //enable TC
count=0;
while(1)
{
Update_WDT();
if((PWM1IR & 0x10)==0x10) //Interrupt flag for capture input 0
{
uart0Puts("I am IN 2\n\r");
count++;
uart0Puts(conv_itoa(count));
PWM1IR=0x10;// to clear the Interrupt need to write 1
PWM1TCR=0X01;
}
}
PWM mode
causes the shadow registers to operate in connection with
the Match registers.
---------- Post added at 09:52 ---------- Previous post was at 09:52 ----------
A program write to a Match register will
not have an effect on the Match result until the
corresponding bit in PWMLER has been set, followed by the
occurrence of a PWM Match 0 event.
but i think PWMLER is used for PWM generation.but here i am counting external pulse
---------- Post added at 14:09 ---------- Previous post was at 12:44 ----------
hey friend thanks a lot for your help.you were like more than a friend....
actually i didn't initialize the TC and PC. so i did TC=0x00; and PC=0x00; and it worked out.it was such a silly mistake....
i hope our conversation would be useful to other embedded engineers also who are working on the same application.
now only the task left is to install my device in vehicle.but i don't know the no of pulse for 1 complete revolution so as to calculate the distance.i'll have to check out the same physically. will let you know the same.
i implemented the above code using interrupt and set the VICs but my program is not entering the routine
VICVectAddr5 = (unsigned long)PWM_CAPTURE_IRQHandler;/* Set Interrupt Vector */
VICVectCntl2 = (1 << 5) | 8; /* use it for Timer0 Interrupt */
VICIntEnable = (1 << 8);
is the above setting OK?
VICVectAddr5 -> 5 is unused in my code
VICVectCntl2 = (1 << 5) | 8;
here 2 is priority after timer(timer0 is 1) and (1<<5) is enable VIC
VICIntEnable = (1 << 8);
here i am enabling VIC.
please reply....
in the user manual VICVectCntl definition is not there.so i used other resisters..i m not in office thats y i can not send the code i'll send u on Monday...
but tell me....i've given 1st priority to timer0...and 2nd priority to pulse capture counter.. but how it would work.because pulse counting will generate regular interrupt.please reply
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