#include <avr/io.h>
#include <stdint.h>
#include <stdbool.h>
#include <util/delay.h>
#include <avr/interrupt.h>
#define FOSC 20000000 // Clock Speed
#define BAUD 250000 //Baud rate for DMX
#define MYUBRR FOSC/16/BAUD-1

volatile uint8_t CH[512];
volatile uint8_t waarde;
//initialisation functions

//Instellen poorten
void InitPorts(void)
{
DDRB = 0xFF; //PORT B input
DDRD = 0xFF;
//instellen ADC
ADMUX=0x20;;
ADCSRA = 0xEF;
}

//Instellen UART
void USART_Init( unsigned int ubrr)
{
UBRR0=ubrr;
UCSR0B = (1<<RXEN0)|(1<<TXEN0|1<<UDRIE0|1<<RXCIE0); //enable RX/TX
UCSR0C = (1<<USBS0)|(3<<UCSZ00); //8bits 2stopbits
}

//main
int main()
{
InitPorts(); //instellen poortenADIF 4 90
USART_Init ( MYUBRR ); //instellen uart
sei();
for(;;){
for (int i = 0; i<11; i++) {
if(waarde >= CH[i+10]){
CH[i+10]=waarde;
}
}
}
return 0;
}

//interrupt voor zenden van DMX
ISR(USART_UDRE_vect){
static uint16_t Counter;
static uint8_t delayCounter;
if(Counter == 512) {
UCSR0B = (1<<RXEN0)|(1<<UDRIE0|1<<RXCIE0); //uitzetten tx
PORTD=0; //signaal laag maken
if(delayCounter == 16) {
UCSR0B = (1<<RXEN0)|(1<<TXEN0|1<<UDRIE0|1<<RXCIE0); //uart weer aanzetten
UDR0=0; //startbyte verzenden
delayCounter = 0;
Counter = 0;
} else {
delayCounter++;
}
} else {
UDR0=CH[Counter];
Counter++;
}
}

//interrupt voor ontvangen van uart RX
ISR(USART_RX_vect){
static bool Break = false;
static bool Mab = false;
static int Counter;
uint8_t dummy;
if (UCSR0A & (1<<FE0)){ //test of er een framing error is geweest
Break = true; //zo ja: zet break op true
Mab = false; //en MAB of false zodat deze weer gecontroleerd word
dummy = UDR0;
} else if(UDR0 == 0 && Break == true) { //test of alles klopt
Break = false;
Mab = true; //als alles klopt: zet MAB op true
Counter = 0; //en counter op 0
} else if(Mab == true) { //test of er echt DMX ontvangen is
CH[Counter-1] = UDR0;
} 
Counter++; //counter verhogen zodat volgend kanaal gelezen word
}

//interrupt voor ADC
ISR(ADC_vect){
waarde=ADCH;
}