/*
 * Spi.h
 *
 * Created: 06.11.2013 15:41:34
 *  Author: netz
 */ 


#ifndef SPI_H_
#define SPI_H_

#include <avr/io.h>
#include <util/delay.h>
#include "hardware/pin.hpp"

template <typename Port, int cspin, int misopin, int mosipin, int sckpin, int mode>
class Spi {
	public:
		Spi() {
			this->init();
		}
		void CSOn() {
			cs::make_low();
		}
		void CSOff() {
			cs::make_high();
		}
		uint8_t send(uint8_t data) {
			if(mode == 0) {
				return this->send_hard(data);
			} 
			return this->send_soft(data);
		}
		uint8_t has_data() {
			return !miso::read();
		}
	private:
		const typedef avrlib::pin<Port, cspin> cs;
		const typedef avrlib::pin<Port, misopin> miso;
		const typedef avrlib::pin<Port, mosipin> mosi;
		const typedef avrlib::pin<Port, sckpin> sck;
		void init() {
			this->init_port();
			if(mode == 0) {
				this->init_spi();
			}
		}			
		void init_port() {
			mosi::make_low();	//output und low;
			sck::make_low();	//output und low;
			cs::make_high();	//output und low;
			miso::make_input();	//input und low;
		}
		void init_spi() {
			SPCR = (1<<SPE) | (1<<MSTR);
			SPSR = (1<<SPI2X);
		}
		uint8_t send_soft(uint8_t data) {
			uint8_t datain=0;
			for (uint8_t i=0; i<8; i++)
			{
				if (data & 0x80) {
					mosi::make_high();
				}
				else {
					mosi::make_low();
				}
				datain <<= 1;
				if(miso::read()) {
					datain |= 1;
				}
				sck::make_high();
				data<<=1;
				_delay_us(0.3);
				sck::make_low();
			}
			return datain;
		}
		uint8_t send_hard(uint8_t data) {
			SPDR = data;							// Sendet ein Byte
			loop_until_bit_is_set(SPSR, SPIF);		// Wartet bis Byte gesendet wurde
			return SPDR;
		}
};

#endif /* SPI_H_ */