From bbb7aa5a3986f36f107a947f222f81733e335258 Mon Sep 17 00:00:00 2001
From: Brendan Le Foll <brendan.le.foll@intel.com>
Date: Wed, 10 Sep 2014 15:42:00 +0100
Subject: [PATCH] grove.cxx: drop ADC resolution to 10bit for calculation

Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
---
 src/grove/grove.cxx | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/grove/grove.cxx b/src/grove/grove.cxx
index 955a0567..bd8b5385 100644
--- a/src/grove/grove.cxx
+++ b/src/grove/grove.cxx
@@ -79,8 +79,9 @@ GroveTemp::~GroveTemp()
 int GroveTemp::value ()
 {
     int a = mraa_aio_read(m_aio);
+    a = a >> 2;
     float r = (float)(1023-a)*10000/a;
-    float t = 1/(logf(r/10000)/3975 + 1/298.15)-273.15;
+    float t = 1/(log(r/10000)/3975 + 1/298.15)-273.15;
     return (int) t;
 }