Merge pull request #35 from resterampeberlin/master

Added threshold handling

Author: caternuson

Adafruit_MAX31865.cpp

@@ -61,6 +61,7 @@ bool Adafruit_MAX31865::begin(max31865_numwires_t wires) {
   setWires(wires);
   enableBias(false);
   autoConvert(false);
+  setThresholds(0, 0xFFFF);
   clearFault();
 
   // Serial.print("config: ");
@@ -139,6 +140,41 @@ void Adafruit_MAX31865::enable50Hz(bool b) {
   writeRegister8(MAX31865_CONFIG_REG, t);
 }
 
+/**************************************************************************/
+/*!
+    @brief Write the lower and upper values into the threshold fault
+    register to values as returned by readRTD()
+    @param lower raw lower threshold
+    @param upper raw upper threshold
+*/
+/**************************************************************************/
+void Adafruit_MAX31865::setThresholds(uint16_t lower, uint16_t upper) {
+  writeRegister8(MAX31865_LFAULTLSB_REG, lower & 0xFF);
+  writeRegister8(MAX31865_LFAULTMSB_REG, lower >> 8);
+  writeRegister8(MAX31865_HFAULTLSB_REG, upper & 0xFF);
+  writeRegister8(MAX31865_HFAULTMSB_REG, upper >> 8);
+}
+
+/**************************************************************************/
+/*!
+    @brief Read the raw 16-bit lower threshold value
+    @return The raw unsigned 16-bit value, NOT temperature!
+*/
+/**************************************************************************/
+uint16_t Adafruit_MAX31865::getLowerThreshold(void) {
+  return readRegister16(MAX31865_LFAULTMSB_REG);
+}
+
+/**************************************************************************/
+/*!
+    @brief Read the raw 16-bit lower threshold value
+    @return The raw unsigned 16-bit value, NOT temperature!
+*/
+/**************************************************************************/
+uint16_t Adafruit_MAX31865::getUpperThreshold(void) {
+  return readRegister16(MAX31865_HFAULTMSB_REG);
+}
+
 /**************************************************************************/
 /*!
     @brief How many wires we have in our RTD setup, can be MAX31865_2WIRE,

Adafruit_MAX31865.h

@@ -73,6 +73,10 @@ class Adafruit_MAX31865 {
   void clearFault(void);
   uint16_t readRTD();
 
+  void setThresholds(uint16_t lower, uint16_t upper);
+  uint16_t getLowerThreshold(void);
+  uint16_t getUpperThreshold(void);
+
   void setWires(max31865_numwires_t wires);
   void autoConvert(bool b);
   void enable50Hz(bool b);