Styjun

I´m building a project where i want to transfer an analog signal from a mikrocontroller (PIC16F1827) to an Arduino via IR-diodes. The PIC takes a analog signal (0-5 V) from a potentiometer (10k Ohm) and converts it with ADC to 8-bit digital code. After that i want to send the binary code that i get from the conversion over IR.
My plan is to have the output do a squarewave signal where the a "1" = HIGH and a "0" = LOW.
ex. input = 3.093V which gives the binary code "10011100" this would then be converted to a squarwave output "HIGH,LOW,LOW,HIGH,HIGH,HIGH,LOW,LOW" so that my IR diode can send it as a package.

The Arduino with an IR transmitter is connected directly to an Arduino Nano on my bread board.

The PIC code only generates a 4000 Hz PWM signal right now but thats wrong, i have not managed to get i to represent it in the wanted "bit signal". The PWM signal is correct and I can se the PWM signal good on my oscilloscope where the duty cycle span is around (0-92%) so around (0-4.6 V).

// INCLUDE
#include <stdio.h>
#include <stdlib.h>
#include <xc.h>

// CONFIG
#pragma config FOSC = HS // Oscillator Selection bits (HS oscillator)
#pragma config WDTE = OFF // Watchdog Timer Enable bit (WDT disabled)
#pragma config PWRTE = ON // Power-up Timer Enable bit (PWRT enabled)
#pragma config BOREN = OFF // Brown-out Reset Enable bit (BOR disabled)
#pragma config LVP = ON // Low-Voltage (Single-Supply) In-Circuit Serial Programming Enable bit (RB3/PGM pin has PGM function; low-voltage programming enabled)
#pragma config CPD = OFF // Data EEPROM Memory Code Protection bit (Data EEPROM code protection off)
#pragma config WRT = OFF // Flash Program Memory Write Enable bits (Write protection off; all program memory may be written to by EECON control)
#pragma config CP = OFF // Flash Program Memory Code Protection bit (Code protection off)

#define _XTAL_FREQ 4000000 //Klockoscillatorfrekvens Fosc=4 MHz
#define BAUDRATE 9600



//Datasheet PIC16F1827
//PWM on page = DS41391D-page 208


//Prototype ---------------------------------------------------------
void PWM_Initialize();
void ADC_Initialize();
unsigned int ADC_Read(unsigned char channel);
void init();
void main();

//----------------------------
void PWM_Initialize()

 PR2 = 254;
 CCP3CON = 0b00001100; //CCP3 i PWM-mode
 CCPTMRS = 0b01001010; //CCP3 use Timer2
 T2CON = 0b00100100; //Timer2 On, Pre-scaler = 1 gives PWM = 4 kHz
 //PR2 = 0b00011001 ;
 //T2CON = 0b00000101 ;
 //CCPR1L = 0b00001100 ;
 //CCP3CON = 0b00111100 ;


//------------------------------
void ADC_Initialize()

 ADCON0 = 0x01; //ADON 
 ADCON1 = 0b01000000; //Left written, AD-clock = Fosc / 4, Vref VDD och VSS
 ADRESL = 0x00;
 ADRESH = 0x00; 


//------------------------------------------
unsigned int ADC_Read(unsigned char channel)

 ADCON0 = (ADCON0 & 0b10000011)
//----------------------------------------------
void init()

 OSCCON = 0b01101000; //Intern clock 4 MHz
 OSCTUNE = 0x00; // TUN 0;
 BORCON = 0x00; // SBOREN disabled;
 ANSELA = 0b00000001; //PortA bit 0 (RA0) analog, all other bit digital
 ANSELB = 0b00000000; //PORTB alla bits digital
 TRISA = 0b00100001; //PORTA bit 0 (RA0) and 5 (RA5) input, rest output
 TRISB = 0x00000000; //PORTB all as output

//Main-program ----------------------------------------------------------------
void main()
{
 int adc_value;
 init(); // Init PORTS
 ADC_Initialize(); // Initializes ADC Module
 PWM_Initialize(); // This sets the PWM frequency of PWM1
 do
 
 adc_value = ADC_Read(0); //Reading Analog Channel 0 from RA0
 PORTB = adc_value; // Indicate bit numbers with 8 LED´s on PORT (RB0-RB7) for tetsing 
 __delay_ms(50); 
 CCPR3L = adc_value; // ADC to PWM signal converter
 __delay_ms(50); 

 while(1); //Infinite Loop

How do i get this conversion? Like this:

I have no knowledge i how to set a squarewave HIGH for x us "to represent a 1 in the squarewave output" and set the squarewave LOW for y us "to represent a 0 in the squarewave output"

so for exempel how do i write a code that for Ex

if ADC_read = "1"
 set squarewave HIGH for 600 us;

if ADC_read"0"
 set squarewave LOW for 1000 us;

Would appreciate any help, Thanks!