From 5515a97be6586c0a318dd012c2277d985b74371e Mon Sep 17 00:00:00 2001
From: Theo Arends <11044339+arendst@users.noreply.github.com>
Date: Sat, 18 May 2019 16:54:29 +0200
Subject: [PATCH] Provide function FastPrecisePowf

Provide function FastPrecisePowf
---
 sonoff/support.ino          |  6 ++++++
 sonoff/xdrv_04_light.ino    |  4 ----
 sonoff/xsns_27_apds9960.ino | 12 +-----------
 3 files changed, 7 insertions(+), 15 deletions(-)

diff --git a/sonoff/support.ino b/sonoff/support.ino
index 317d25065..c10c81eb0 100644
--- a/sonoff/support.ino
+++ b/sonoff/support.ino
@@ -674,6 +674,12 @@ double FastPrecisePow(double a, double b)
   return r * u.d;
 }
 
+float FastPrecisePowf(const float x, const float y)
+{
+//  return (float)(pow((double)x, (double)y));
+  return (float)FastPrecisePow(x, y);
+}
+
 uint32_t SqrtInt(uint32_t num)
 {
   if (num <= 1) {
diff --git a/sonoff/xdrv_04_light.ino b/sonoff/xdrv_04_light.ino
index 391702b52..a25b63d0e 100644
--- a/sonoff/xdrv_04_light.ino
+++ b/sonoff/xdrv_04_light.ino
@@ -718,10 +718,6 @@ void LightStateClass::HsToRgb(uint16_t hue, uint8_t sat, uint8_t *r_r, uint8_t *
 
 #define POW FastPrecisePowf
 
-float FastPrecisePowf(float a, float b) {
-  return (float) FastPrecisePow(a,b);
-}
-
 void LightStateClass::RgbToXy(uint8_t i_r, uint8_t i_g, uint8_t i_b, float *r_x, float *r_y) {
   float x = 0.31271f;   // default medium white
   float y = 0.32902f;
diff --git a/sonoff/xsns_27_apds9960.ino b/sonoff/xsns_27_apds9960.ino
index 7594a5322..909bb607e 100644
--- a/sonoff/xsns_27_apds9960.ino
+++ b/sonoff/xsns_27_apds9960.ino
@@ -374,21 +374,11 @@ void calculateColorTemperature(void)
   n = (xc - 0.3320F) / (0.1858F - yc);
 
   /* Calculate the final CCT */
-  color_data.cct = (449.0F * powf(n, 3)) + (3525.0F * powf(n, 2)) + (6823.3F * n) + 5520.33F;
+  color_data.cct = (449.0F * FastPrecisePowf(n, 3)) + (3525.0F * FastPrecisePowf(n, 2)) + (6823.3F * n) + 5520.33F;
 
   return;
 }
 
-/**
-*   Taken from the Adafruit-Library
-*    @brief  Implements missing powf function
-*/
-
-float powf(const float x, const float y)
-{
-  return (float)(pow((double)x, (double)y));
-}
-
  /*******************************************************************************
   * Getters and setters for register values
   ******************************************************************************/