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-rw-r--r--src/core/ao.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/core/ao.h b/src/core/ao.h
index 711b3533..9d801489 100644
--- a/src/core/ao.h
+++ b/src/core/ao.h
@@ -85,7 +85,9 @@ ao_panic(uint8_t reason);
extern volatile __data AO_TICK_TYPE ao_tick_count;
/* Our timer runs at 100Hz */
+#ifndef AO_HERTZ
#define AO_HERTZ 100
+#endif
#define AO_MS_TO_TICKS(ms) ((ms) / (1000 / AO_HERTZ))
#define AO_SEC_TO_TICKS(s) ((s) * AO_HERTZ)