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xbee radio communication between PICs

 
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becool123



Joined: 12 Jul 2010
Posts: 2

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xbee radio communication between PICs
PostPosted: Mon Jul 12, 2010 4:23 am     Reply with quote
Hi,
I m trying to send the temperature from one PIC to an other and I am facing some problems.
I work in simulation mode, Proteus 7 for the schematic and CCS C for the C Code.

Here My Code,

the file UART.c
Code:

char RecUART (void);
void EmitUART(char c);
void InitUART(void);
/* Initialisation de l'UART */
void InitUART(void)
{
TXSTA = 0x20;
RCSTA = 0x90;
SPBRG = 0x06;
}
/* Emission d'un octet sur l'UART */
void EmitUART(char c)
{
TXREG = c;
}
/* Reception d'un Octet sur l'UART */
char RecUART (void)
{
return(RCREG);
}

The file xbee.c
Code:

#include "USART.c"

void InitXbee(void)
{
set_tris_d=0x18;
PORTD=0x05;
}
void SendByte(char c)
{
EmitUART(c);
}

char ReadByte(void)
{
return(RecUART());
}

void SendString(const unsigned char *s)
{
int i=0;
while(s[i]!='\0')
{
/* utilisation de lcd_putch */
SendByte(s[i]);DelayMs(100);
i++;
}

void ReadString(const unsigned char *s)
{
int i=0;
while( ReadByte()!='\0')
{
s[i]=ReadByte()
i++;
DelayMs(100);
}
}

Emitters code
Code:

#include <16F877.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>

#include "Lcd.c"
#include "USART.c"

#device adc= 10 //sur 10 bits
#fuses HS, NOWDT, NOLVP, NOBROWNOUT, NOPROTECT, PUT
#use delay(clock=20000000)
#use rs232(baud=19200, xmit=PIN_C6, rcv=PIN_C7)

#byte PortA = 5 // adresse du PORT A
#byte PortB = 6 // adresse du PORT B

long tension;
float val;
char ordre[32];

void main() {

setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);

set_tris_a(0b00001111);
setup_adc_ports(A_ANALOG);

setup_adc(ADC_CLOCK_DIV_32);
set_adc_channel(0);

InitUART();
InitXbee();

while(1)
{
delay_ms(100);
tension = read_adc();
temp=((float)tension/1023)*5*100;
sprintf(ordre,"%f",temp)//pour convertir de float à string
SendString(ordre);
}
}

receiver code
Code:

#include <16F877.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#use delay(clock=20000000)
#fuses HS, NOWDT, NOPROTECT, PUT, NOLVP
#use rs232 (baud = 9600, xmit = PIN_C6, rcv = PIN_C7)
#include "Lcd.c"

#include "Lcd.c"
#include "USART.c"

void main()
{
char ordre[32];

lcd_init();

InitUART();
InitXbee();

while(1 ){
ReadString(ordre);
printf(lcd_putc,"\f%f C",ordre);
}
}
 

Thank you for your future response.
nina



Joined: 20 Apr 2007
Posts: 111

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xbee
PostPosted: Mon Jul 12, 2010 9:35 am     Reply with quote
becool123

where did you get xbee.c ?

tks

nina
ckielstra



Joined: 18 Mar 2004
Posts: 3680
Location: The Netherlands

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PostPosted: Mon Jul 12, 2010 9:38 am     Reply with quote
Quote:
and I am facing some problems.
It helps if you describe what your problem is. Here we are not good in reading minds (yet).

Code:
#include "Lcd.c"

#include "Lcd.c"
1 time is enough.

Code:
void InitUART(void)
{
TXSTA = 0x20;
RCSTA = 0x90;
SPBRG = 0x06;
}
This will overwrite the settings from the '#use RS232' line. Delete these lines.

Code:
/* Emission d'un octet sur l'UART */
void EmitUART(char c)
{
TXREG = c;
}
/* Reception d'un Octet sur l'UART */
char RecUART (void)
{
return(RCREG);
}
Why not use putc() and getc()? These are more portable and CCS has included some code to handle error flags in the UART.

Code:
#use rs232(baud=19200, xmit=PIN_C6, rcv=PIN_C7)
Add 'ERRORS'. This makes the CCS compiler insert code for clearing error flags in the UART.

Code:
void ReadString(const unsigned char *s)
{
int i=0;
while( ReadByte()!='\0')
{
s[i]=ReadByte()
i++;
DelayMs(100);
}
}
Why the 100ms delay? Characters will arrive at 19200bps ~ 1920 characters / second ~ 0.5ms per character.
The hardware UART has a receive buffer for 3 characters. When receiving more data the UART will stop and only start again when the error status is cleared (that's why I like the CCS functions!).
Remove this delay, and many of the other delays as well.
becool123



Joined: 12 Jul 2010
Posts: 2

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PostPosted: Mon Jul 12, 2010 11:10 am     Reply with quote
thank you really for your response Smile
I corrected some lines in my code thanks to your comments, and you have reason about "USART.c", we can use putc(), puts(), getc() , gets() .

So the problem is in Xbee.c :
In the datasheet of xbee, they talk about AT command, RTS, CTS!!!
Should I use them or I can send I receive like I did?
Thank you
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