altos: Make sure pa to altitude conversion is done with 32 bits

[fw/altos] / src / micropeak / ao_pins.h

diff --git a/src/micropeak/ao_pins.h b/src/micropeak/ao_pins.h
index 257b8694bc3c6301ecea048660dd3c1602e90df0..63e9cb1b26663ce0259d2134003d8fa334b54ae0 100644 (file)
--- a/src/micropeak/ao_pins.h
+++ b/src/micropeak/ao_pins.h
@@ -57,8 +57,9 @@
 #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_ */