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16f628 example please

 
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willie.ar



Joined: 21 Jan 2004
Posts: 15
Location: Argentina

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16f628 example please
PostPosted: Wed Jan 21, 2004 9:46 am     Reply with quote
I need something easy to start with for the 16f628: a sample programm turning on and off an output and sending a message to the rs232 port. I'm missing something important that don't let me do any of these things. I already tryed with some lines I used for the 16f84 that were running but with the 16f628 don't work. I should be easer since this chip includes an USART but nothing works.
any help will be welcome !
tks
rwyoung



Joined: 12 Nov 2003
Posts: 563
Location: Lawrence, KS USA

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PostPosted: Wed Jan 21, 2004 4:30 pm     Reply with quote
The following should work.
Assumes 4MHz crystal (HS oscillator mode).
RS232 stream has been named "OUT232" in case you want to try adding a second RS232 software port.
I/O pin defalts to the #use standard_io() method where the compiler is generating code to set the TRIS bit each time it changes the pin state.

Code came from test code used on CCS's 16F877 board but I've changed the header and pin assignments to comply with the 16F628.

Code:

#include <16f628.h>

#fuses HS, NOLVP, NOWDT, PUT
#use delay (clock=4000000)
#use rs232(baud=9600,parity=N,xmit=PIN_B2,rcv=PIN_B1,bits=8,stream=OUT232)

#define LED PIN_A1

void main(void)
{
   while(TRUE) {
      fprintf(OUT232, "\r\nON");
      output_low(LED);
      delay_ms(1000);
      fprintf(OUT232, "\r\nOFF");
      output_high(LED);
      delay_ms(1000);
   }
}

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