diff --git a/Makefile b/Makefile
index 3faee76..dd39ff1 100644
--- a/Makefile
+++ b/Makefile
@@ -54,7 +54,7 @@ RESETPORT = /dev/ttyU0
 
 
 TARGET = pyrorf
-SRC = main.c lcd.c 
+SRC = main.c lcd.c spi.c
 CXXSRC =
 ASRC = i2cmaster.S
 MCU = atmega2560
diff --git a/schema.pdf b/schema.pdf
new file mode 100644
index 0000000..0710a30
Binary files /dev/null and b/schema.pdf differ
diff --git a/spi.c b/spi.c
index cb4a1b8..e293a04 100644
--- a/spi.c
+++ b/spi.c
@@ -2,78 +2,21 @@
 #include <util/delay.h>
 
 
-void spi_begin() {
-#if defined(SPCR)
-#error to write ...
-	// Set SS to high so a connected chip will be "deselected" by default
-	digitalWrite(SS, HIGH);
-	// When the SS pin is set as OUTPUT, it can be used as
-	// a general purpose output port (it doesn't influence
-	// SPI operations).
-	pinMode(SS, OUTPUT);
-	// Warning: if the SS pin ever becomes a LOW INPUT then SPI
-	// automatically switches to Slave, so the data direction of
-	// the SS pin MUST be kept as OUTPUT.
-	SPCR |= _BV(MSTR);
-	SPCR |= _BV(SPE);
-	// Set direction register for SCK and MOSI pin.
-	// MISO pin automatically overrides to INPUT.
-	// By doing this AFTER enabling SPI, we avoid accidentally
-	// clocking in a single bit since the lines go directly
-	// from "input" to SPI control.
-	// http://code.google.com/p/arduino/issues/detail?id=888
-	pinMode(SCK, OUTPUT);
-	pinMode(MOSI, OUTPUT);
-#else
-    PRR &= ~(_BV(PRUSI));
-	USICR = _BV(USIWM0);
-	USCK_DDR |= _BV(USCK_BIT); //set the USCK pin as output
-	DO_DDR |= _BV(DO_BIT); //set the DO pin as output
-	DI_DDR &= ~_BV(DI_BIT); //set the DI pin as input
-#endif
+
+void spi_init_master() {
+
+    SPCR = _BV(SPE) | _BV(MSTR) | _BV(SPR0);
+    
+    SPI_PORT |= _BV(SCK_PIN);
+    SPI_DDR |= _BV(MOSI_PIN) | _BV(SCK_PIN) | _BV(SS_PIN);
+   
 }
 
 uint8_t spi_transfer(uint8_t b) {
-#if defined(SPCR)
+
 	SPDR = b;
 	while (!(SPSR & _BV(SPIF)));
 	return SPDR;
-#else
-	USIDR = b;
-	USISR = _BV(USIOIF);
-	do {
-		USICR = _BV(USIWM0) | _BV(USICS1) | _BV(USICLK) | _BV(USITC);
-//		_delay_ms(1);
-	}while ((USISR & _BV(USIOIF)) == 0);
-	return USIDR;
-#endif
-}
-
-void spi_end() {
-#if defined(SPCR)
-	SPCR &= ~_BV(SPE);
-#else
-	USICR &= ~(_BV(USIWM1) | _BV(USIWM0));
-#endif
-}
-
-void spi_setBitOrder(uint8_t bitOrder)
-{
-#if defined(SPCR)
-	if(bitOrder == LSBFIRST) {
-		SPCR |= _BV(DORD);
-	} else {
-		SPCR &= ~(_BV(DORD));
-	}
-#endif
-}
-
-void spi_setDataMode(uint8_t mode)
-{
-#if defined(SPCR)
-	SPCR = (SPCR & ~SPI_MODE_MASK) | mode;
-#else
-
-#endif
+
 }
 
diff --git a/spi.h b/spi.h
index eabdb91..10325b4 100644
--- a/spi.h
+++ b/spi.h
@@ -4,20 +4,32 @@
 #include <stdint.h>
 #include <avr/io.h>
 #include <util/atomic.h>
+#include "defines.h"
+
 
 #ifdef __cplusplus
 extern "C"{
 #endif
 
+#if defined (__AVR_ATmega32__)
 
-//SPI data modes
-#define SPI_MODE0 0x00
-#define SPI_MODE1 0x04
+#elif defined (__AVR_ATmega2560__)
+#define SPI_PORT PORTB
+#define SPI_DDR DDRB
+
+#define SS_PIN PB0
+#define SCK_PIN PB1
+#define MOSI_PIN PB2
+#define MISO_PIN PB3
+
+#endif
+
+
+void spi_init_master(void);
+void spi_init_slave(void);
 
-void spi_begin(void);
-void spi_setDataMode(uint8_t spiDataMode);
 uint8_t spi_transfer(uint8_t spiData);
-void spi_end(void);
+
 
 
 #ifdef __cplusplus