#include <avr/io.h>
#include <util/delay.h>
#include <stdio.h>
#include <avr/pgmspace.h>
#include <avr/eeprom.h>
#include <avr/interrupt.h>
#include "uart/USI_UART.h"
//#include "../LUFA-111009/LUFA/Drivers/Misc/RingBuffer.h"

//static RingBuffer_t txBuffer;
//static uint8_t      txBuffer_Data[16];

//int buffer_txbyte(unsigned char);
uint16_t samples[64];
uint8_t sample;

void setup(void);

//FILE uart_str = FDEV_SETUP_STREAM(buffer_txbyte, NULL, _FDEV_SETUP_WRITE);
FILE uart_str = FDEV_SETUP_STREAM(USI_UART_Transmit_Byte, NULL, _FDEV_SETUP_WRITE);

int main(void)
{
	uint16_t a;
	uint8_t i,j;
	setup();
	sei();
	printf_P(PSTR("\r\nHello, World!\r\n"));
	//printf("!\r\n");

	while(1)
	{
		//USI_UART_Transmit_Byte('a');
		//ADCSRA|=(1<<ADSC);
		//while(ADCSRA&(1<<ADSC));
		a=0;
		for(i=0;i<64;i++)
			a+=samples[i];
		a|=( ((uint16_t)ADCH)<<8 );
		printf_P(PSTR("S: %u\r\n"),a);
		_delay_ms(100);
		
	}
}

void setup(void)
{
	stdout=&uart_str;

	//pullup: PB0, PB2
	//output: PB1
	//floating analog: PB3(adc3-), PB4(adc2+)
	PORTB=(1<<1) | (1<<0)|(1<<2);
	DDRB=(1<<1);
	DIDR0=(1<<3)|(1<<4);

	ADMUX=(1<<1); //single ended adc2/pb4
	ADCSRA=(1<<7) | (1<<ADATE)|(1<<ADIE) | (1<<ADPS2)|(1<<ADPS1); //125khz /64
	ADCSRB=0;
	ADCSRA|=(1<<ADSC);
	//RingBuffer_InitBuffer(&txBuffer, txBuffer_Data, sizeof(txBuffer_Data));
}

/*void software_txbyte(uint8_t byte)
{
	//24-38400
	#define BIT_TIME_US 24
	#define PORTX PORTB
	#define DDRX DDRB
	#define PN 1
	uint8_t bit;
	uint8_t inter;
	//byte=0xAA;
	//byte^=0xFF;
	inter=(SREG&(1<<7));
	cli();
	PORTX|=(1<<PN);
	DDRX|=(1<<PN);
	PORTX&=~(1<<PN);
	_delay_us(BIT_TIME_US);
	for(bit=0;bit<8;bit++)
	{
		if((byte>>bit)&0x01)
			PORTX|=(1<<PN);
		else
			PORTX&=~(1<<PN);
		_delay_us(BIT_TIME_US);
	}
	PORTX|=(1<<PN);
	_delay_us(BIT_TIME_US);
	if(inter) sei();
}*/

/*int buffer_txbyte(unsigned char byte)
{
	if(status.no_printf)
		return 0;
	disable_other_interrupts();
	software_txbyte(byte);
	//USI_UART_Transmit_Byte(byte);
	return 0;
}*/
/*int buffer_txbyte(unsigned char byte)
{
	if(RingBuffer_GetFreeCount(&txBuffer)>2)
	{
		RingBuffer_Insert(&txBuffer,byte);
		return 0;
	}else if(RingBuffer_GetFreeCount(&txBuffer)>0)
	{
		RingBuffer_Insert(&txBuffer,'X');
		return 0;
	}
	return 1;
}*/

ISR(ADC_vect,ISR_NOBLOCK)
{
	sample++;
	if(sample>63) sample=0;
	samples[sample]=ADCL;
	samples[sample]|=( ((uint16_t)ADCH)<<8 );
}