From a20ac4270203c49279b9110542aae13d55b22147 Mon Sep 17 00:00:00 2001
From: Matteo Pignataro <matteo.pignataro@skywarder.eu>
Date: Mon, 3 Apr 2023 13:56:52 +0000
Subject: [PATCH] [max31855] Fixed temperature sampling using 2 complement
---
src/shared/sensors/MAX31855/MAX31855.cpp | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/src/shared/sensors/MAX31855/MAX31855.cpp b/src/shared/sensors/MAX31855/MAX31855.cpp
index c55d08065..75ab83dc4 100644
--- a/src/shared/sensors/MAX31855/MAX31855.cpp
+++ b/src/shared/sensors/MAX31855/MAX31855.cpp
@@ -68,18 +68,19 @@ bool MAX31855::checkConnection()
TemperatureData MAX31855::sampleImpl()
{
- uint16_t sample;
+ int16_t sample;
{
SPITransaction spi{slave};
sample = spi.read16();
+ sample = sample >> 2;
}
TemperatureData result{};
result.temperatureTimestamp = TimestampTimer::getTimestamp();
// Convert the integer and decimal part separately
- result.temperature = static_cast<float>(sample >> 2) * 0.25;
+ result.temperature = static_cast<float>(sample) * 0.25;
return result;
}
--
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