1 files changed, 5 insertions, 0 deletions

diff --git a/firmware/include/fixedpoint.h b/firmware/include/fixedpoint.h
index 3e14bdd68e..584bd58d84 100644
--- a/firmware/include/fixedpoint.h
+++ b/firmware/include/fixedpoint.h
@@ -102,6 +102,11 @@ unsigned long isqrt(unsigned long x);
 #define FP_INF          (0x7fffffff)
 #define FP_NEGINF      -(0x7fffffff)
 
+/** FIXED POINT EXP10
+ * Return 10^x as FP integer.  Argument is FP integer.
+ */
+long fp_exp10(long x, unsigned int fracbits);
+
 /* fracbits in range 12 - 22 work well. Higher is better for
  * calculating dB, lower is better for calculating factor.
  */