help with code for rfPIC12F675

[mariuszoll]

Hi,

Could you help me please with an example of C code for rfPIC12F675?
It is my first RF application.
The application is going to work at 433MHZ, ASK mode.

Thank you.

 

[Golden Electronics]

what type example u require

 

[mariuszoll]

Could you give me please a "Hello World" example?
For instance, if I press the button from Tx board, the LED from Rx board turns on.

 

[mariuszoll]

I started to write the software for the transmitter board, but unfortunately it doesn't work.
Could you help me please to fix it?
Please find attached my C code:

#include <htc.h>
#include <pic.h>
#include <picrf675f.h>

// Internal registers configuration

/* Data Memory Code Protection disabled (CPD_OFF)
* Program Memory Code Protection disabled(CP_OFF)
* Brown-out Detection disabled(BOREN_OFF)
* MCLR pin function is I/O(MCLR_OFF)
* Power-up Timer disabled(PWRTE_OFF)
* Watchdog Timer disabled(WDTE_OFF)
* Internal Oscillator(FOSC_INTRCCLK) */

__CONFIG(INTIO&CPD_OFF&CP_OFF&BOREN_OFF&MCLRE_OFF&PWRTE_OFF&WDTE_OFF&FOSC_INTRCCLK);

// definitions
#define _XTAL_FREQ 4000000

#define TXD		GPIO2 	// serial data out
#define RFEN	GPIO5	// transmitter enable
#define SW1		GPIO3	// Button1
#define SW2		GPIO4	// Button2

unsigned char temp;
char encoded[2];	// this is an array of two bytes(manchester encoded that represent the one byte put in)

void SendData(unsigned char txbyte)
{
	int i,j,b,me;

	b=txbyte;

	for(i=0;i<2;i++)	// manchester encoded txbyte
	{
		me=0;
		for(j=0;j<4;j++)
		{
			me>>=2;
			if(b&(1)!=0) 
			{	
				me|=0x40;	// 1->0; 01000000
			}
			else
			{
				me|=0x80;	// 0->1; 10000000
			}
			b>>=1;
		}	
		encoded[i]=me;
	}
}

// main function
void main(void)
{
	// GPIO settings
	TRISIO=0b00010000;	// GP3 and GP4 inputs
	ANSEL=0;			// configurred port as digital
	WPU=0b00010000;		// pull-up on for GP4 
	IOC=0b00011000;		//	wake up on change enabled for GP3 and GP4

	// Interrupts
	INTCON=0b00010000;	// enable port change wakeup from sleep

	// Comparator module-- setings for sleep mode
	CMCON=7;			// Comparator disable
	VRCON=0;			// disable the voltage reference

	// Configurations
	OPTION_REG=0;		// GPIO pull-ups enabled

	TXD=0;				// no data transmitted
	RFEN=0;				// RF transmitter off	

	while(1)
	{
		if((SW1==1)&&(SW2==1))
		{
			RFEN=0;		// disable transmission
		}
		if(SW1==1)		// button1 pressed
		{
			temp=0x23;	// data to be sent
			SendData(temp);
		}
		if(SW2==1)		// button 2 pressed
		{
			temp=0x43;	// data to be sent
			SendData(temp);
		}
	}

 

[Golden Electronics]

U require port change interrupt bit3 & u enable bit 4 which is external interrupt. Also no ISR routine if interrupt occur. no Global interrupt enable.

Also what is switch default condition. If it is high then u require pull up. If it low then u require pull down /............

 

[mariuszoll]

this is the remote control schematic:
View attachment Transmitter_433Mhz.pdf

 

[Golden Electronics]

this is the remote control schematic:
View attachment 101545

https://ww1.microchip.com/downloads/en/AppNotes/tb069a.pdf

 

[mariuszoll]

Thanks, it looks similar to mine.