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rami_shama
Joined: 29 Apr 2010
Posts: 11
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| How can I count 5 pulses and then active an output at 16f877 |
 Posted: Mon May 17, 2010 7:29 am |
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Hello,
How can I count 5 pulses ( T=1 sec, Duty cycle = 1/2 f= 1Hz) at input B0, and then make active B5 ?
And I'm use PIC 16F877A and PIC C program.
Thank you. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon May 17, 2010 11:26 am |
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You can use the INT_EXT feature of Pin B0 to detect the edge of the
pulse. You can do it with, or without an #int_ext interrupt routine.
Just increment a count variable every time you detect an edge.
When the count = 5, the set pin B5 to a high level.
To do it with interrupts, create an #int_ext function and increment a
static int8 variable inside the function (which is initialized to 0).
Increment it every time an interrupt occurs. When the count = 5,
then set Pin B5 high.
To do it without interrupts, you can wait in a while() loop. Use the
interrupt_active() function to tell if the edge of the pulse has been
detected. Then increment a counter and call the clear_interrupt()
function (to clear the INT_EXT interrupt). When the count = 5, then
set pin B5 high. |
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rami_shama
Joined: 29 Apr 2010
Posts: 11
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| Posted: Mon May 17, 2010 12:00 pm |
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This is my code
so what can i do??
and i need it to count the Pulses when the program at:
| Code: | while (true)
{ "here"
.
.
.
} |
| Code: | #include "F:\cc\main.h"
int check_change();
void menu();
void end();
void cursor();
int which_MSG();
int sen1,sen2,sen3=0,i;
int x;
void standby();
int s1,s2,s3;
int which;
void main()
{
setup_adc_ports(NO_ANALOGS);
setup_adc(ADC_CLOCK_DIV_2);
setup_psp(PSP_DISABLED);
setup_spi(FALSE);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_comparator(NC_NC_NC_NC);
setup_vref(FALSE);
output_low(PIN_B0);
output_low(PIN_B1);
output_low(PIN_B2);
set_tris_a(0x11);
set_tris_b(0xE8);
output_high(PIN_B5);
if(input(PIN_A0))
sen1=1;
if(input(PIN_A1))
sen2=1;
if(input(PIN_A2))
sen3=1;
x=0;
while (true)
{
if(input(PIN_A0))
s1=1;
else
s1=0;
if(input(PIN_A1))
s2=1;
else
s2=0;
if(input(PIN_A2))
s3=1;
else
s3=0;
standby();
//if (check_change()==1 && input(PIN_B3)==0)
if(!(sen1==s1 && sen2==s2 && sen3==s3) && input(PIN_B3)==0)
{
end();
end();
menu();
menu();
menu();
cursor();
cursor();
cursor();
cursor();
menu();
which=which_MSG();
if(s1==1 && s2==1 && s3==1)
{
for(i=0; i<7; i++)
cursor();
}
else
for(i=0; i<which; i++)
cursor();
menu();
menu();
cursor();
menu();
menu();
cursor();
menu();
menu();
end();
delay_ms(1000);
if(input(PIN_A0))
sen1=1;
else
sen1=0;
if(input(PIN_A1))
sen2=1;
else
sen2=0;
if(input(PIN_A2))
sen3=1;
else
sen3=0;
}
}
}
/*int check_change()
{
int s1,s2,s3;
if(input(PIN_A0))
s1=1;
else
s1=0;
if(input(PIN_A1))
s2=1;
else
s2=0;
if(input(PIN_A2))
s3=1;
else
s3=0;
if(sen1!=s1 || sen2!=s2 || sen3!=s3)
return 1;
else
return 0;
}
*/
void menu()
{
output_high(PIN_B0);
delay_ms(300);
output_low(PIN_B0);
delay_ms(300);
}
void end()
{
output_high(PIN_B1);
delay_ms(300);
output_low(PIN_B1);
delay_ms(300);
}
void cursor()
{
output_high(PIN_B2);
delay_ms(300);
output_low(PIN_B2);
delay_ms(300);
}
int which_MSG()
{
delay_ms(3000);
if(input(PIN_A0))
s1=1;
else
s1=0;
if(input(PIN_A1))
s2=1;
else
s2=0;
if(input(PIN_A2))
s3=1;
else
s3=0;
delay_ms(300);
if(s1==0 && s2==0 && s3==0)
return 0;
else if(s1==0 && s2==0 && s3==1)
return 1;
else if(s1==0 && s2==1 && s3==0)
return 2;
else if(s1==0 && s2==1 && s3==1)
return 3;
else if(s1==1 && s2==0 && s3==0)
return 4;
else if(s1==1 && s2==0 && s3==1)
return 5;
else if(s1==1 && s2==1 && s3==0)
return 6;
else if(s1==1 && s2==1 && s3==1)
return 7;
}
void standby()
{
output_low(PIN_B5);
delay_ms(90);
output_high(PIN_B5);
delay_ms(90);
}
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Please help me if you can! |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Mon May 17, 2010 12:12 pm |
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What is the purpose of your project ?
What signal are you trying to count ? Why ? |
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rami_shama
Joined: 29 Apr 2010
Posts: 11
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| Posted: Mon May 17, 2010 10:29 pm |
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My project is to send status message when any input changed.
The Pulses is output of vibration of the mobile, so i wanna let the pic to open the call "Press send". |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue May 18, 2010 1:25 pm |
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You have too much code, and I have no idea what it's doing.
My advice is to make a test program which has the purpose of detecting
the "ring" vibration on your cell phone. The only thing this program will
do, is to test routines for vibration detection.
Then, when you a reliable routine for "vibration detection", you can
combine it with your main program. |
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rami_shama
Joined: 29 Apr 2010
Posts: 11
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| Posted: Tue May 18, 2010 9:46 pm |
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I thought it is too hard to do it, as I'm still beginner in CCS programing.
So I will take the Signal from vibration and enter it to a Opto Coupler.
and the opto will active SEND bottom..
Thanks all |
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