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Multiplexing

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naren

Joined: 18 Nov 2016
Posts: 10

Multiplexing

Posted: Tue Nov 29, 2016 12:26 am

Can anyone teach how to convert this c code to multiplexing since I used different ports for different 7 segment display.

Code:

#include <18f452.h>
#include <string.h>
#USE DELAY (CLOCK=4000000)
#FUSES XT, NOWDT, NOPROTECT, DEBUG

main(void)
{
int i=0,j=0;
set_tris_b(0xFF);

while(1){

start:if(input(PIN_C0)){ //PIN CO to start program
for(j=0;j<6;j++) {{{ //For the seven segment display for seconds

output_a(0x3F); //value 0
delay_us(650);
output_a(0x06); //value 1
delay_us(650);
output_a(0x5B); //value 2
delay_us(650);
output_a(0x4F); //value 3
delay_us(650);
output_a(0x66); //value 4
delay_us(650);
output_a(0x6D); //value 5
delay_us(650);
output_a(0x7D); //value 6
delay_us(650);
output_a(0x07); //value 7
delay_us(650);
output_a(0xFF); //value 8
delay_us(650);
output_a(0x67); //value 9
delay_us (650);

}

switch(j) { //For the seven segment display for seconds
case 0 :output_d(0x06);
output_a(0x3F);
break;
case 1 :output_d(0x5B);
output_a(0x3F);
break;
case 2 :output_d(0x4F);
output_a(0x3F);
break;
case 3 :output_d(0x66);
output_a(0x3F);
break;
case 4 :output_d(0x6D);
output_a(0x3F);
break;
case 5 :output_d(0x3F);
output_a(0x3F);
break;
}
}

if (j==5){ //For the seven segment display for minutes
i++;
switch(i){
case 1 :output_b(0x06);
break;
case 2 :output_b(0x5B);
break;
case 3 :output_b(0x4F);
break;
case 4 :output_b(0x66);
break;
case 5 :output_b(0x6D);
break;
case 6 :output_b(0x7D);
break;
case 7 :output_b(0x07);
break;
case 8 :output_b(0xFF);
break;
case 9 :output_b(0x67);
i=-1;
break;
default: output_b(0x3F);
}
}
}

}

if (input(PIN_C1)){ //TO reset the stopwatch
output_b (0x3F) ; //display will show a 0
output_d (0x3F) ; //display will show a 0
output_a (0x3F) ; //display will show a 0
i=0;
j=0;
goto start;
}

}
}

_________________
naren

Mike Walne

Joined: 19 Feb 2004
Posts: 1785
Location: Boston Spa UK

Re: Multiplexing

Posted: Tue Nov 29, 2016 4:13 am

naren wrote:

Can anyone teach how to convert this c code to multiplexing since I used different ports for different 7 segment display.

Learn to use the code button, it preserves formatting and should make your code easier to read.

I don't understand your question.

Are you wanting to drive all your LED cathodes from one port and anodes from another?

If so there are loads of examples on this forum and CCS.

Mike

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