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-rw-r--r--src/core/ao_data.h6
1 files changed, 4 insertions, 2 deletions
diff --git a/src/core/ao_data.h b/src/core/ao_data.h
index 339afe69..5a232885 100644
--- a/src/core/ao_data.h
+++ b/src/core/ao_data.h
@@ -18,6 +18,8 @@
#ifndef _AO_DATA_H_
#define _AO_DATA_H_
+#define GRAVITY 9.80665
+
#if HAS_ADC
#define AO_DATA_ADC (1 << 0)
#else
@@ -300,8 +302,8 @@ typedef int16_t accel_t;
#define HAS_GYRO 1
-typedef int16_t gyro_t;
-typedef int32_t angle_t;
+typedef int16_t gyro_t; /* in raw sample units */
+typedef int16_t angle_t; /* in degrees */
/* Y axis is aligned with the direction of motion (along) */
/* X axis is aligned in the other board axis (across) */