SerialControledDAC

/*
 * GccApplication3.c
 *
 * Created: 13.03.2018 15:41:25
 * Author : nicx321
 */

#include <avr/interrupt.h>
#define F_CPU 3333333
#define USART0_BAUD_RATE(BAUD_RATE) ((float)F_CPU * 64 / (16 * (float)BAUD_RATE))
#include <avr/io.h>
#include <util/delay.h>

void SendChr(char X){
    while(!(USART0.STATUS & USART_DREIF_bm)){}
    USART0.TXDATAL = X;
}
/*
void SendStr(char *str){
    int i = 0;
    while(str[i] != '\0' && str[i] != 13){
        while(!(USART0.STATUS & USART_DREIF_bm)){}
        USART0.TXDATAL = str[i];
        i++;
    }
}
*/
char USART_readChr(){
    while(!(USART0.STATUS & USART_RXCIF_bm));
    return USART0.RXDATAL;
}

void USART_read(char *cp)
{
    int state = 0;
    if((USART0.STATUS & USART_RXCIF_bm))
    {
        while ((USART0.STATUS & USART_RXCIF_bm)){
            cp[state] = USART0.RXDATAL;
            state++;
        }
        cp[state+1]=0;
    }
}

void InitUart(){
    PORTB.DIRSET = PIN2_bm; // RX pin as output
    PORTB.OUTCLR = PIN2_bm; //
    PORTB.DIRCLR = PIN3_bm; // TX pin set as input
    PORTB_PIN3CTRL &= ~PORT_PULLUPEN_bm; // Leave it as pulled-off
    USART0.BAUD = (uint16_t)USART0_BAUD_RATE(9600);
    USART0.CTRLB = 0 << USART_MPCM_bp       /* Multi-processor Communication Mode: disabled */
        | 0 << USART_ODME_bp     /* Open Drain Mode Enable: disabled */
        | 1 << USART_RXEN_bp     /* Reciever enable: enabled */
        | USART_RXMODE_NORMAL_gc /* Normal mode */
        | 0 << USART_SFDEN_bp    /* Start Frame Detection Enable: disabled */
        | 1 << USART_TXEN_bp;    /* Transmitter Enable: enabled */
    USART0.CTRLA |= 0x80;
}

void initDac43(){
    VREF.CTRLA |= 0b00000011;
    VREF.CTRLA &= 0b11111011;
    DAC0.DATA = 0;
    DAC0.CTRLA |= 0b11000001;
}

int main(void)
{
    initDac43();
    PORTC.DIRSET = 1;
    InitUart();
    sei();
    while(1){}
}

ISR(USART0_RXC_vect){
    cli();
    char X = USART_readChr();
    DAC0.DATA = X;
    SendChr(X);
    sei();
}