initial commit

spi.h

@@ -0,0 +1,20 @@
+#ifndef _SPI_H_
+#define _SPI_H_
+
+#include <avr/io.h>
+
+#define SPI_PORT        PORTB	/* target-specific port containing the SPI lines */
+#define SPI_DDR         DDRB	/* target-specific DDR for the SPI port lines */
+
+#define CS_DDR          DDRJ	/* target-specific DDR for chip-select */
+#define CS_PORT         PORTJ	/* target-specific port used as chip-select */
+#define CS_BIT          3	/* target-specific port line used as chip-select */
+
+uint8_t spi_read();
+void spi_write(uint8_t d);
+void spi_select(void);
+void spi_deselect(void);
+unsigned char spi_xchg(unsigned char val);
+void spi_init(void);
+
+#endif