RGB_NodeRed

/*
 * rgbMainNodeRed.c
 *
 *  Created on: Feb 10, 2019
 *      Author: rezwan
 */

#include<avr/io.h>
#include<util/delay.h>
#include <stdio.h>
//#include <avr/iom328p.h>
#define F_CPU 16000000UL

#define RedChnl OCR1A
#define GreenChnl OCR1B
#define BlueChnl OCR0A

#define FOSC 16000000 /**< Clock speed for UBRR calculation. refer page 179 of 328p datasheet. */
#define BAUD 9600 /**< Baud Rate in bps. refer page 179 of 328p datasheet. */
#define MYUBRR FOSC/16/BAUD-1 /**< UBRR = (F_CPU/(16*Baud))-1 for asynch USART page 179 328p datasheet. Baud rate 9600bps, assuming 16MHz clock UBRR0 becomes 0x0067*/

/**
 * @brief Initialize USART for 8 bit data transmit no parity and 1 stop bit.
 *
 *@details This is a code snippet from datasheet page 182
 *
 * @param ubrr The UBRR value calculated in macro MYUBRR
 * @see MYUBRR
 */
void USART_init(unsigned int ubrr)
{

    UCSR0C = (0<<USBS0)|(3<<UCSZ00); /// Step 1. Set UCSR0C in Asynchronous mode, no parity, 1 stop bit, 8 data bits
    UCSR0A = 0b00000000;/// Step 2. Set UCSR0A in Normal speed, disable multi-proc

    UBRR0H = (unsigned char)(ubrr>>8);/// Step 3. Load ubrr into UBRR0H and UBRR0L
    UBRR0L = (unsigned char)ubrr;


    UCSR0B = 0b00011000;/// Step 4. Enable Tx Rx and disable interrupt in UCSR0B
}

/**
 * @brief Send 8bit data.
 *
 *@details This is a code snippet from datasheet page 184
 *
 * @param data The 8 bit data to be sent
 */

int USART_send(char c, FILE *stream)
{

    while ( !( UCSR0A & (1<<UDRE0)) )/// Step 1.  Wait until UDRE0 flag is high. Busy Waitinig
    {;}

    UDR0 = c; /// Step 2. Write char to UDR0 for transmission
}

/**
 * @brief Receive 8bit sata.
 *
 *@details This is a code snippet from datasheet page 187
 *
 * @return Returns received data from UDR0
 */
int USART_receive(FILE *stream )
{

    while ( !(UCSR0A & (1<<RXC0)) )/// Step 1. Wait for Receive Complete Flag is high. Busy waiting
        ;

    return UDR0;/// Step 2. Get and return received data from buffer
}
void init_TMR0(){
    OCR0A =255; // 100% duty cycle thats means it's OFF

    TCCR0A |= (1<<COM0A1)|(1<<WGM01)|(1<<WGM00); //fast pwm
    TCCR0B |= (1<<CS00); //prescalar 1:1
    DDRD |= (1<<PD6); //OC0A
}
void init_TMR1(){
            OCR1B = 255;
            OCR1A = 255;
            TCCR1B|=(1<<WGM12);
            TCCR1A|=(1<<COM1A1)|(0<<COM1A0)|(1<<COM1B1)|(0<<COM1B0)|(1<<WGM10);


            //COM1A1:COM1A0 =10 COM1B1:COM1B0 =10 and for Clear OC1A/OC1B on Compare Match, set OC1A/OC1B at TOP
            //For more information 2313 datasheet table 44 pg 104
            // PWM_Frequency= F_osc / (PreScaler*(1+TOP))= 16MHz / (1*(1023+1))=  15625 = 15.63 KHz
            // Resolution= log(TOP+1)/log(2)= 10 bit

            TCCR1B|=(0<<CS12)|(0<<CS11)|(1<<CS10);//CS12->10 = 001 is for 1:1 timer pre-scaler. Start timer
            DDRB|=(1<<PB2)|(1<<PB1);//OC1A and OC1B as output

}
int main(void)
{
        init_TMR0();
        init_TMR1();
        USART_init(MYUBRR);
        stdout = fdevopen(USART_send, NULL);
        stdin = fdevopen(NULL, USART_receive);
        RedChnl = 255;  //OCR1B
        GreenChnl= 255; //OCR1B
        BlueChnl = 255; //OCR0B5
        while(1)
        {


            scanf("%d %d %d",&RedChnl, &GreenChnl, &BlueChnl);
            printf("{ \"Red\": %d} {\"Green\": %d} {\"Blue\": %d}", RedChnl, GreenChnl, BlueChnl); //JOSN object


        }
}