cont pulse C18

[Mitt]

Sorry, my language maybe wrong becuase I'm Thai'student.
I use pic18f4620. I want to count pulse form input(motion sensor).I want count pulse by count pulse chang 1 to 0 becuase I use pull up at sensor.
Give me app note or example note for guild me please. I use mplab c18.
I begin practice use controller by mplab c18.
Thank you

 

[Arkham00]

Just read the input at regular intervals (let's say in the main loop of your program or during timed interrupt) and store the value in a variable.
When you re-read the value, if the new value is 0 and the old is 1, then increment counter.

...
if (new_value==0) && (old_value==1) {
    counter++ ;
}
old_value = new_value ;
...

 

[Mitt]

Just read the input at regular intervals (let's say in the main loop of your program or during timed interrupt) and store the value in a variable.
When you re-read the value, if the new value is 0 and the old is 1, then increment counter.

...
if (new_value==0) && (old_value==1) {
    counter++ ;
}
old_value = new_value ;
...

Thank you for your answer.
Assume, I want use port RC0 connect to sensor for count pulse.
I want to read pulse for keep in new_value. What do I have to write the code or make any functions? I try to read MPLAB_C18_Users_Guide but my language have a problem,so show me the example code.
thank you

 

[Mitt]

#include <p18f4620.h>
#include <timers.h>
#include <portb.h>


#pragma romdata CONFIG1H = 0x300001
const rom unsigned char config1H = 0b00000110; // HSPLL oscillator

#pragma romdata CONFIG2L = 0x300002
const rom unsigned char config2L = 0b00011111; // Brown-out Reset Enabled in hardware @ 2.0V, PWRTEN disabled

#pragma romdata CONFIG2H = 0x300003
const rom unsigned char config2H = 0b00010010; // HW WD disabled, 1:512 prescaler

#pragma romdata CONFIG3H = 0x300005
const rom unsigned char config3H = 0b10000010; // PORTB digital on RESET

#pragma romdata CONFIG4L = 0x300006
const rom unsigned char config4L = 0b10000001; // DEBUG disabled,
// XINST disabled
// LVP disabled
// STVREN enabled







// prototype section
void int0_isr (void); //Interrupts sevice rounting for External interrupts 0//
void EnableLowInterrupts (void);

/*
* For PIC18xxxx devices, the low interrupt vector is found at 000000018h.
* Change the default code section to the absolute code section named
* low_vector located at address 0x18.
*/
#pragma code low_vector=0x18
void low_interrupt (void)
{
/*
* Inline assembly that will jump to the ISR.
*/

if(INTCONbits.INT0IF == 1)
{
_asm GOTO int0_isr _endasm
}

}

/*
* Returns the compiler to the default code section.
*/
#pragma code

/*
* Specifies the function timer_isr as a low-priority interrupt service
* routine. This is required in order for the compiler to generate a
* RETFIE instruction instead of a RETURN instruction for the timer_isr
* function.
*/
#pragma interruptlow int0_isr

/*
* Define the timer_isr function. Notice that it does not take any
* parameters, and does not return anything (as required by ISRs).
*/
void
int0_isr (void)
{
INTCONbits.INT0IF = 0;

}

int counter;
void main (void)
{

RCONbits.IPEN=1;
INTCONbits.GIEL=1;

OpenRB0INT( PORTB_CHANGE_INT_ON & FALLING_EDGE_INT & PORTB_PULLUPS_ON);

while (1)
{

}
}

void EnableLowInterrupts (void)
{

} At interupts, I want cout pulse keep at Counter.How should I create the code?

 

[Mitt]

#include <p18f4620.h>
#include <timers.h>
#include <portb.h>
int counter;


#pragma romdata CONFIG1H = 0x300001
const rom unsigned char config1H = 0b00000110; // HSPLL oscillator

#pragma romdata CONFIG2L = 0x300002
const rom unsigned char config2L = 0b00011111; // Brown-out Reset Enabled in hardware @ 2.0V, PWRTEN disabled

#pragma romdata CONFIG2H = 0x300003
const rom unsigned char config2H = 0b00010010; // HW WD disabled, 1:512 prescaler

#pragma romdata CONFIG3H = 0x300005
const rom unsigned char config3H = 0b10000010; // PORTB digital on RESET

#pragma romdata CONFIG4L = 0x300006
const rom unsigned char config4L = 0b10000001; // DEBUG disabled,
// XINST disabled
// LVP disabled
// STVREN enabled







// prototype section
void int0_isr (void); //Interrupts sevice rounting for External interrupts 0//
void EnableLowInterrupts (void);

/*
* For PIC18xxxx devices, the low interrupt vector is found at 000000018h.
* Change the default code section to the absolute code section named
* low_vector located at address 0x18.
*/
#pragma code low_vector=0x18
void low_interrupt (void)
{
/*
* Inline assembly that will jump to the ISR.
*/

if(INTCONbits.INT0IF == 1)
{
_asm GOTO int0_isr _endasm
}

}

/*
* Returns the compiler to the default code section.
*/
#pragma code

/*
* Specifies the function timer_isr as a low-priority interrupt service
* routine. This is required in order for the compiler to generate a
* RETFIE instruction instead of a RETURN instruction for the timer_isr
* function.
*/
#pragma interruptlow int0_isr

/*
* Define the timer_isr function. Notice that it does not take any
* parameters, and does not return anything (as required by ISRs).
*/

void int0_isr () // Interrupts sevrvice routine for Interrupts RB0(FALLING_EDGE_INT)//
{
INTCONbits.INT0IF = 0;

counter++;
}


void main (void)
{

RCONbits.IPEN=1;
INTCONbits.GIEL=1;

OpenRB0INT( PORTB_CHANGE_INT_ON & FALLING_EDGE_INT & PORTB_PULLUPS_ON);

while (1)
{

}
}

void EnableLowInterrupts (void)
{

}
I want to simulate simulate this program but i have a problem about simulation process.

 

[Mitt]

**broken link removed**