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RS 232

 
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umka



Joined: 28 Aug 2007
Posts: 99
Location: New Zealand

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RS 232
PostPosted: Tue Sep 25, 2007 3:07 pm     Reply with quote
i have made a crude laptimer that out puts the most recent 3 lap times and current lap time on a 4line lcd but the rs232 part is not outputting to the computer. the lap time resets and transmits on a button press

here is the code. i have connected TX(pin 25) to through a max 232 to the computers serial port.

Code:
#include <16F877a.H>
#fuses XT, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock = 4000000)
#use rs232(baud=9600, xmit=PIN_b2,rcv=PIN_b1,BITS =8, PARITY=n, stop=2)
#include <Flex_LCD420.c>   

unsigned int8 msec, msec1, msec2, msec3;
unsigned int8 sec, sec1, sec2, sec3;
unsigned int8 min, min1, min2, min3;
unsigned int8 lap_num,but_state;

//===================================
void main()
{
lcd_init();
delay_ms(500);
printf(lcd_putc, "\f");
delay_ms(500);

   msec=0; sec=0; min=0; msec1=0; sec1=0; min1=0; msec2=0; sec2=0;
   min2=0; msec3=0; sec3=0; min3=0;
   lap_num =0;
   
while(1)
  {
  but_state = input(PIN_B5);
 
     if (but_state == 0)
      {
         delay_ms(10);
         msec++;
                 
            if (msec==100)
            { 
               sec++;
               msec=0;
               
               printf(lcd_putc, "\fCurrent Lap %02u:%02u" ,min,sec);
               printf(lcd_putc, "\nLap %02u   %02u:%02u:%02u" ,lap_num, min1,sec1,msec1);
               printf(lcd_putc, "\nLap %02u   %02u:%02u:%02u" ,lap_num-1,min2,sec2,msec2); 
               printf(lcd_putc, "\nLap %02u   %02u:%02u:%02u" ,lap_num-2,min3,sec3,msec3); 
            }
           
            if (sec==59)
            {
               min++;
               sec=255;
            }
      }
     
      if( but_state==1 )   //button PIN B5 goes high
      {
      printf("Lap %02u   %02u:%02u:%02u\n\r" ,lap_num+1, min,sec,msec);
     
         msec3=msec2; sec3=sec2; min3=min2;
         
         msec2=msec1; sec2=sec1; min2=min1;     
         
         msec1=msec;  sec1=sec;  min1=min;

         msec=0;      sec=0;     min=0;
         
         while(but_state == 1)      //waits for button PIN B5 to be go low
            {
               but_state = input(PIN_B5);
               delay_ms(1);
            }
           
         lap_num++;         
      }
  }
}


thanks
for any help
Ttelmah
Guest
PostPosted: Tue Sep 25, 2007 3:19 pm     Reply with quote
Er.
You have connected pin 25 to the MAX232, but told the code to use pin 35....
As an 'aside', do you really need to use 2 stop bits?. This means the data cannot be sent by the hardware UART, unless you start fiddling (send 9 bits, and set the 9th bit high).

Best Wishes
umka



Joined: 28 Aug 2007
Posts: 99
Location: New Zealand

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PostPosted: Tue Sep 25, 2007 4:01 pm     Reply with quote
no i dont need the 2 stop bits i guess

yes i see its on b2 my mistake

cheers for the help
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