/*
 * uart.c
 */ 

#include "../defines.h"
#include <avr/io.h>
#include <stdlib.h>
#include <stdint.h>
#include "uart.h"

static volatile unsigned char strTxBuffer[1024];
static volatile unsigned char strRxBuffer[1024];


void uart_characterPut( unsigned char data )
{
    while(!(UCSR0A & (1<<UDRE0))){};
    UDR0 = data;
}

void uart_init(unsigned int ubrr)
{   
    /* Set baud rate */
    UBRR0H = ubrr >> 8;
    UBRR0L = ubrr & 0xFF;

    /* Enable receiver and transmitter */
    //UCSR0B |= (1<<RXCIE0)|(1<<RXEN0)|(1<<TXEN0); // RXCIE0: RX Interrupt
    UCSR0B |= (1<<RXEN0)|(1<<TXEN0); // RXCIE0: RX Interrupt

    /* Set frame format: 8data, 1stop bit */
    UCSR0C = (1<<UCSZ00)|(1<<UCSZ01);
}

void uart_flush(void)
{
    uint8_t dummy;
    while (UCSR0A & (1<<RXC0))
    {
        dummy = UDR0;
    }
}

void uart_stringPut(char *s)
{
    while(*s)
    {
        uart_characterPut(*s);
        s++;
    }
}

char uart_characterWaitGet( void )
{
    // Wait for data to be rec<F7>eived
    while ( !(UCSR0A & (1<<RXC0)) ) {};
    // Get and return received data from buffer
    return UDR0;
}

char uart_characterNoWaitGet( void )
{
    unsigned char retVal;
    if ((1<<RXC0) == (UCSR0A & (1<<RXC0)))
    {
        retVal = UDR0;
    }
    else
    {
        retVal = 0;
    }

    return retVal;
}

uint8_t uart_stringGet(char* buffer_pc, uint8_t maxLen_u8)
{
    char nextChar_c;
    uint8_t strLen_u8 = 0;

    nextChar_c = uart_characterWaitGet();

    while ((nextChar_c != '\r') && (nextChar_c != '\n') && (strLen_u8 < maxLen_u8 - 1))
    {
        *buffer_pc++ = nextChar_c;
        strLen_u8++;
        nextChar_c = uart_characterWaitGet();
    }

    *buffer_pc = '\0';

    return strLen_u8;
}