1 files changed, 54 insertions, 0 deletions
diff --git a/include/spi.h b/include/spi.h
new file mode 100644
index 0000000..04ea726
--- /dev/null
+++ b/include/spi.h
@@ -0,0 +1,54 @@
+/*
+ * spi.h
+ *
+ *  Created on: 17.04.2009
+ *      Author: leo
+ */
+
+#ifndef SPI_H_
+#define SPI_H_
+
+#define SPI_PORT      	PORTB		/* SPI Connection port */
+#define SPI_DDR       	DDRB		/* SPI Direction port */
+#define SPI_SS		0
+#define SPI_SCK		1
+#define SPI_MOSI	2
+#define SPI_MISO	3
+
+
+/* SPI macros */
+
+#define SPI_SET_SPEED_F_2		do {SPCR = (1<<SPE) | (1<<MSTR) | (0<<SPR1) | (0<<SPR0); SPSR = (1<<SPI2X); } while(0)
+#define SPI_SET_SPEED_F_4		do {SPCR = (1<<SPE) | (1<<MSTR) | (0<<SPR1) | (0<<SPR0); SPSR = (0<<SPI2X); } while(0)
+#define SPI_SET_SPEED_F_8		do {SPCR = (1<<SPE) | (1<<MSTR) | (0<<SPR1) | (1<<SPR0); SPSR = (1<<SPI2X); } while(0)
+#define SPI_SET_SPEED_F_16		do {SPCR = (1<<SPE) | (1<<MSTR) | (0<<SPR1) | (1<<SPR0); SPSR = (0<<SPI2X); } while(0)
+#define SPI_SET_SPEED_F_32		do {SPCR = (1<<SPE) | (1<<MSTR) | (1<<SPR1) | (0<<SPR0); SPSR = (1<<SPI2X); } while(0)
+#define SPI_SET_SPEED_F_64		do {SPCR = (1<<SPE) | (1<<MSTR) | (1<<SPR1) | (0<<SPR0); SPSR = (0<<SPI2X); } while(0)
+#define SPI_SET_SPEED_F_128		do {SPCR = (1<<SPE) | (1<<MSTR) | (1<<SPR1) | (1<<SPR0); SPSR = (0<<SPI2X); } while(0)
+
+/** switch to fast SPI Clock */
+#define SPISetFastClock() 	 SPI_SET_SPEED_F_2
+#define SPISetSlowClock() 	 SPI_SET_SPEED_F_8
+#define SPISetMMCInitClock() SPI_SET_SPEED_F_64
+
+
+static inline void spi_wait() {
+	loop_until_bit_is_set(SPSR,SPIF);
+}
+
+static inline void spi_write(uint8_t a) {
+	SPDR = a;
+}
+
+static inline void spi_xmit(uint8_t a){
+	spi_write(a);
+	spi_wait();
+}
+
+static inline uint8_t spi_rcvr(void) {
+	SPDR = 0xFF;
+	spi_wait();
+	return SPDR;
+}
+
+#endif /* SPI_H_ */