Intial commit

src/spi.h

@@ -0,0 +1,31 @@
+#pragma once
+
+#include <avr/io.h>
+
+
+#if defined __AVR_ATmega328P__
+    #define SPI_DDR  DDRB
+    #define SPI_PORT PORTB
+    #define SPI_SCK  PB5
+    #define SPI_MISO PB4
+    #define SPI_MOSI PB3
+    #define SPI_CS   PB2
+#elif defined  __AVR_ATmega32__ || defined __AVR_ATmega16__
+    #define SPI_PORT PORTB
+    #define SPI_DDR DDRB
+    #define SPI_SCK PB7
+    #define SPI_MOSI PB5
+    #define SPI_CS PB4
+#endif
+
+namespace spi
+{
+    void init();
+    uint8_t transfer(uint8_t data);
+  
+    inline void cs_low() {SPI_PORT &= ~(1<<SPI_CS);}
+
+    inline void cs_high() {SPI_PORT |= (1<<SPI_CS);}
+} // namespace spi
+
+