From d11fc8116e7ccd2663ef911249fc7ecb3429b625 Mon Sep 17 00:00:00 2001
From: Daniel Friesel <derf@finalrewind.org>
Date: Sat, 25 Dec 2021 23:14:24 +0100
Subject: lm75: correctly read out sub-zero temperatures

---
 src/driver/lm75.cc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/driver/lm75.cc b/src/driver/lm75.cc
index 6c6c60a..3fd1483 100644
--- a/src/driver/lm75.cc
+++ b/src/driver/lm75.cc
@@ -10,6 +10,8 @@
 #include "driver/soft_i2c.h"
 #endif
 
+#include <stdint.h>
+
 float LM75::getTemp()
 {
 	txbuf[0] = 0;
@@ -17,7 +19,7 @@ float LM75::getTemp()
 	rxbuf[1] = 0;
 	i2c.xmit(address, 1, txbuf, 2, rxbuf);
 
-	return rxbuf[0] + (rxbuf[1] / 256.0);
+	return (int8_t)rxbuf[0] + (rxbuf[1] / 256.0);
 }
 
 unsigned int LM75::getOS()
-- 
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