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paef
Joined: 22 Apr 2006
Posts: 2
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| Serial communication tutorial? |
 Posted: Sat Apr 22, 2006 8:21 am |
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Hi, i have a PIC16F84 that i'm trying to get communicate with my computer.. It should currently run at 4mhz with this crystal i use..
So i wonder if there is any good tutorials out there that show how you are suppose to communicate with a computer through the serialport? Tried google but couldn't find any good...
This code is what i use today, but only get scramble tokens to the computer, #&%"!&Y¤##%"??`"#!% something like that.. I try to send hello world from pic processor...
Also a good developer would be nice, i am currently using a program called Cc5x, this prog doesn't seem to work with code i find on the net..
ie the #use stuff doesn't seem to be in it
| Code: |
#include "16F84.h"
/* Circuitprogrammer Configuration: */
#pragma config |= 0x3ff1
#define ON 1
#define OFF 0
#pragma bit lightdiode @ RB1
#pragma bit button @ RB0
bit putchar( char ); /* function prototype */
char text1( char ); /* function prototype */
void delay( char millisec)
/*
Delays a multiple of 1 milliseconds at 4 MHz
using the TMR0 timer
*/
{
OPTION = 2; /* prescaler divide by 8 */
do {
TMR0 = 0;
while ( TMR0 < 125) /* 125 * 8 = 1000 */
;
} while ( -- millisec > 0);
}
void main( void)
{
TRISB = 0b11111100; /* RB0 out, RB1 out */
int i;
lightdiode=ON;
while (1) {
lightdiode=ON;
for(i=0; putchar( text1(i)); i++) ;
}
}
char text1( char x)
{
skip(x); /* internal function CC5x. */
#pragma return[] = "hello, world" '\r' '\n' '\0'
}
/* ECHOS CHARACTER TO PIN */
bit putchar( char d_out ) /* sends one char */
{
char bitCount, ti;
/* One start bit, one stop bit, 8 data bit, no parity = 10 bit. */
/* Baudrate: 9600 baud => 104.167 usec. per bit. */
if(d_out == '\0') return 0; /* refuse to send "end of string" */
PORTB.0 = 0; /* set startbit */
for ( bitCount = 10; bitCount > 0 ; bitCount-- )
{
/* delay one bit 104 usec at 4 MHz (5+30*3-1+1+9=104) */
ti = 30; do ; while( --ti > 0); nop();
Carry = 1; /* stopbit */
d_out = rr( d_out ); /* Rotate Right through Carry */
PORTB.0 = Carry;
}
return 1; /* all done */
}
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Humberto
Joined: 08 Sep 2003
Posts: 1215
Location: Buenos Aires, La Reina del Plata
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| Posted: Sat Apr 22, 2006 8:47 am |
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This forum belongs to CCS.
The posted code was written for another compiler that you actually are using,
so you are looking for help in the wrong forum.
CCS C Compiler has built in functions that enable you to write true C code,
not pseudo-code.
The following code does the same as your code.
| Code: |
#include <16F84.H>
#fuses XT,NOWDT,NOPROTECT,PUT
#use delay (clock=4000000)
#use rs232(baud=9600, xmit=PIN_B1, rcv=PIN_B0)
void main()
{
while(1)
{
printf("Hello World");
delay_ms(500);
}
}
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Humberto |
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Guest
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| Posted: Sat Apr 22, 2006 9:04 am |
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Oh, tnx..
will try this complier then, seems better! |
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paef
Joined: 22 Apr 2006
Posts: 2
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| Posted: Sat Apr 22, 2006 9:12 am |
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| Code: |
#pragma chip PIC16F84, core 14, code 1024, ram 12 : 0x4F
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Invalid pre-processor directive i get from that one.... are there diffrent headerfiles for this complier, and where can i find them in that case?
edit:
BAAH, do you realy have to buy it to get access to that file? its a schoolthing, will probably use it twice.. and cost was abit to much for me when i only will use it once or twice? 125 dollars ? :/
tnx.. |
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Humberto
Joined: 08 Sep 2003
Posts: 1215
Location: Buenos Aires, La Reina del Plata
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| Posted: Sat Apr 22, 2006 10:27 am |
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If you are going to use it only for school things, another choice you have is to download the demo-version wich is free.
It only support 3 type of microcontroller, so you would buy the PIC16F877 (~$10,00.)
You can get the demo-version here:
http://www.ccsinfo.com/content.php?page=compdemo
Humberto |
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rberek
Joined: 10 Jan 2005
Posts: 207
Location: Ottawa, Canada
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| Posted: Sat Apr 22, 2006 11:58 am |
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That code looks like Microchip's C18 code.
They have a student version of their compiler, which is free, as welll. |
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