Add fast moving average filter for faster startup

stm-firmware/include/reflow-controller/adc-meas.h

@@ -38,6 +38,12 @@
  */
 #define ADC_PT1000_FILTER_WEIGHT 0.005f
 
+/**
+  * @brief Moving average filter weight used for fast regaulation. This is used when the measured resistance
+  * is more than 20 Ohms away from the current averaged value.
+  */
+#define ADC_PT1000_FILTER_WEIGHT_FAST 0.05
+
 /**
  * @brief ADC channel number of PT1000 sensor input
  */
@@ -99,6 +105,8 @@
  */
 #define ADC_TO_RES(adc) ((float)(adc) / 4096.0f * 2500.0f)
 
+#define RES_TO_ADC(res) ((float)(res) / 2500.0f * 4096.0f)
+
 /**
  * @brief This function sets up the ADC measurement fo the external PT1000 temperature sensor
  *