#define I2C_PIN_SDA PINB0
#define AO_CONST_ATTRIB PROGMEM
+typedef int32_t alt_t;
#define FETCH_ALT(o) ((alt_t) pgm_read_dword(&altitude_table[o]))
-#define AO_ALT_VALUE(x) ((x) * 10)
+#define AO_ALT_VALUE(x) ((x) * (alt_t) 10)
#endif /* _AO_PINS_H_ */