One way RF communication between pic 16f877a.

[areeckal]

I need to establish RF communication between two pic 16f877a. I need to transmit a bit according to the sensor output. How to configure pic for this? I studied USART and I have written the following code:

#include <htc.h>
#include "usart.h"

unsigned int data;
void delay()
{
	for(int i=0;i<100;i++)
	{}
}

void main(void)
{
	INTCON=0;	// purpose of disabling the interrupts.

	init_comms();	// set up the USART - settings defined in usart.h

	data=PORTC;
	putch(data);
	delay();
	data=getch();
	PORTD=data;
}

 

[ckshivaram]

refer this Nigel's PIC Tutorial Page

 

[areeckal]

I have written a simple code for transmitter and receiver.. Will this work fine?
Transmitter:

#include <htc.h>
#include "usart.h"

//Chip Settings
__CONFIG(1,0x0200);
__CONFIG(2,0X1E1F);
__CONFIG(3,0X8100);
__CONFIG(4,0X00C1);
__CONFIG(5,0XC00F);

void main()
{
	unsigned int data;
	//Initialize the USART
	USARTInit();
	//Now Read some input
	while(1)
	{
		data=PORTC;
		/* 
      	Now send a Packet
      	Packet Format is AA<data><data inverse>Z
		total Packet size if 5 bytes.
      	*/
		//Stabilize the Tx Module By Sending JUNK data
		//J for Junk
		USARTWriteByte('J');
		//Send 'A'
      	USARTWriteByte('A');
	    //Send Another 'A'
    	USARTWriteByte('A');
	   	//Send the data;
      	USARTWriteByte(data);
	    //Send inverse of data for error detection purpose
	    USARTWriteByte(~data);
		//End the packet by writing 'Z'
      	USARTWriteByte('Z');
		_delay(10);

	}
}

Receiver:

#include <htc.h>
#include "usart.h"

//Chip Settings
__CONFIG(1,0x0200);
__CONFIG(2,0X1E1F);
__CONFIG(3,0X8100);
__CONFIG(4,0X00C1);
__CONFIG(5,0XC00F);

void main()
{
	unsigned int packet[2],data;
	TRISC=0x00;
	//Initialize the USART
	USARTInit();
	//Get data from Tx
	while(1)
	{
			
		//Wait for a packet
		if(USARTReadByte()=='A')
		{
			if(USARTReadByte()=='A')
			{
				packet[0]=USARTReadByte();
				packet[1]=USARTReadByte();
				if((packet[0]!=~(packet[1]))&&(USARTReadByte()!='Z'))
					continue;
				else
				{
					data=packet[0];
					PORTC=data;
				}
			}
		}
	

		
	}
}

I have a doubt. In this case, I am presenting a 1 byte value each time. Ie, iam sending a 5 byte packet. So when TxREG is equal to say 0x01 after transmission, RCREG will get it immediately? Will RCIF will be set to 1 after transmission of a single byte?