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-rw-r--r--mcu/ATtiny85.h11
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diff --git a/mcu/ATtiny85.h b/mcu/ATtiny85.h
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+/* This is specific configuration for ATtiny85.
+ * This configuration also applies on ATtiny45 and ATtiny25.
+ */
+#include <avr/io.h>
+
+#define USI_DIR_REG DDRB
+#define USI_OUT_REG PORTB
+#define USI_IN_REG PINB
+#define USI_USCK_PIN PORTB2
+#define USI_DO_PIN PORTB1
+#define USI_DI_PIN PORTB0