Use 'adv vref' from HAL instead of constant voltage

Marlin/src/HAL/AVR/HAL.h

@@ -147,8 +147,8 @@ typedef Servo hal_servo_t;
 //
 // ADC
 //
-#define HAL_ADC_VREF        5.0
-#define HAL_ADC_RESOLUTION 10
+#define HAL_ADC_VREF_MV   5000
+#define HAL_ADC_RESOLUTION  10
 
 //
 // Pin Mapping for M42, M43, M226

Marlin/src/HAL/DUE/HAL.h

@@ -123,7 +123,7 @@ typedef Servo hal_servo_t;
 //
 // ADC
 //
-#define HAL_ADC_VREF         3.3
+#define HAL_ADC_VREF_MV   3300
 #define HAL_ADC_RESOLUTION  10
 
 #ifndef analogInputToDigitalPin

Marlin/src/HAL/ESP32/HAL.h

@@ -169,7 +169,7 @@ void _delay_ms(const int ms);
 // MarlinHAL Class
 // ------------------------
 
-#define HAL_ADC_VREF         3.3
+#define HAL_ADC_VREF_MV   3300
 #define HAL_ADC_RESOLUTION  10
 
 class MarlinHAL {

Marlin/src/HAL/LINUX/HAL.h

@@ -80,8 +80,8 @@ extern MSerialT usb_serial;
 #define CRITICAL_SECTION_END()
 
 // ADC
-#define HAL_ADC_VREF           5.0
-#define HAL_ADC_RESOLUTION    10
+#define HAL_ADC_VREF_MV   5000
+#define HAL_ADC_RESOLUTION  10
 
 // ------------------------
 // Class Utilities

Marlin/src/HAL/LPC1768/HAL.h

@@ -127,7 +127,7 @@ extern DefaultSerial1 USBSerial;
                                     // K = 6, 565 samples, 500Hz sample rate, 1.13s convergence on full range step
                                     // Memory usage per ADC channel (bytes): 4 (32 Bytes for 8 channels)
 
-#define HAL_ADC_VREF            3.3 // ADC voltage reference
+#define HAL_ADC_VREF_MV      3300   // ADC voltage reference
 
 #define HAL_ADC_RESOLUTION     12   // 15 bit maximum, raw temperature is stored as int16_t
 #define HAL_ADC_FILTERED            // Disable oversampling done in Marlin as ADC values already filtered in HAL

Marlin/src/HAL/NATIVE_SIM/HAL.h

@@ -114,8 +114,8 @@ extern MSerialT serial_stream_3;
 // ADC
 // ------------------------
 
-#define HAL_ADC_VREF           5.0
-#define HAL_ADC_RESOLUTION    10
+#define HAL_ADC_VREF_MV   5000
+#define HAL_ADC_RESOLUTION  10
 
 /* ---------------- Delay in cycles */
 

Marlin/src/HAL/SAMD21/HAL.h

@@ -111,8 +111,8 @@ typedef Servo hal_servo_t;
 //
 
 #define HAL_ADC_FILTERED     1     // Disable Marlin's oversampling. The HAL filters ADC values.
-#define HAL_ADC_VREF         3.3
-#define HAL_ADC_RESOLUTION   12
+#define HAL_ADC_VREF_MV   3300
+#define HAL_ADC_RESOLUTION  12
 #define HAL_ADC_AIN_START ADC_INPUTCTRL_MUXPOS_PIN3
 #define HAL_ADC_AIN_NUM_SENSORS 3
 #define HAL_ADC_AIN_LEN HAL_ADC_AIN_NUM_SENSORS-1

Marlin/src/HAL/SAMD51/HAL.h

@@ -112,7 +112,7 @@ typedef Servo hal_servo_t;
 //
 
 //#define HAL_ADC_FILTERED          // Disable Marlin's oversampling. The HAL filters ADC values.
-#define HAL_ADC_VREF         3.3
+#define HAL_ADC_VREF_MV   3300
 #define HAL_ADC_RESOLUTION  10      // ... 12
 
 //

Marlin/src/HAL/STM32/HAL.h

@@ -160,7 +160,7 @@ typedef libServo hal_servo_t;
   #define HAL_ADC_RESOLUTION 12
 #endif
 
-#define HAL_ADC_VREF         3.3
+#define HAL_ADC_VREF_MV   3300
 
 //
 // Pin Mapping for M42, M43, M226

Marlin/src/HAL/STM32/temp_soc.h

@@ -341,6 +341,6 @@
 
 #elif defined(TS_TYPICAL_V) && defined(TS_TYPICAL_SLOPE) && defined(TS_TYPICAL_TEMP)
 
-  #define TEMP_SOC_SENSOR(RAW) ((TS_TYPICAL_V - (RAW) / float(OVERSAMPLENR) / float(HAL_ADC_RANGE) * float(ADC_VREF)) / (TS_TYPICAL_SLOPE/1000) + TS_TYPICAL_TEMP)
+  #define TEMP_SOC_SENSOR(RAW) ((TS_TYPICAL_V - (RAW) / float(OVERSAMPLENR) / float(HAL_ADC_RANGE) * (float(ADC_VREF_MV) / 1000.0f)) / ((TS_TYPICAL_SLOPE) / 1000) + TS_TYPICAL_TEMP)
 
 #endif

Marlin/src/HAL/STM32F1/HAL.h

@@ -190,7 +190,7 @@ typedef int8_t pin_t;
   #define HAL_ADC_RESOLUTION 12
 #endif
 
-#define HAL_ADC_VREF         3.3
+#define HAL_ADC_VREF_MV   3300
 
 uint16_t analogRead(const pin_t pin); // need hal.adc_enable() first
 void analogWrite(const pin_t pin, int pwm_val8); // PWM only! mul by 257 in maple!?

Marlin/src/HAL/TEENSY31_32/HAL.h

@@ -101,7 +101,7 @@ uint32_t __get_PRIMASK(void); // CMSIS
   #define analogInputToDigitalPin(p) ((p < 12U) ? (p) + 54U : -1)
 #endif
 
-#define HAL_ADC_VREF         3.3
+#define HAL_ADC_VREF_MV   3300
 #define HAL_ADC_RESOLUTION  10
 
 //

Marlin/src/HAL/TEENSY35_36/HAL.h

@@ -106,7 +106,7 @@ typedef int8_t pin_t;
   #define analogInputToDigitalPin(p) ((p < 12U) ? (p) + 54U : -1)
 #endif
 
-#define HAL_ADC_VREF         3.3
+#define HAL_ADC_VREF_MV   3300
 #define HAL_ADC_RESOLUTION  10
 
 //

Marlin/src/HAL/TEENSY40_41/HAL.h

@@ -124,7 +124,7 @@ typedef int8_t pin_t;
   #define analogInputToDigitalPin(p) ((p < 12U) ? (p) + 54U : -1)
 #endif
 
-#define HAL_ADC_VREF         3.3
+#define HAL_ADC_VREF_MV   3300
 #define HAL_ADC_RESOLUTION  10
 #define HAL_ADC_FILTERED      // turn off ADC oversampling
 

Marlin/src/feature/filwidth.h

@@ -67,7 +67,7 @@ class FilamentWidthSensor {
   }
 
   // Convert raw measurement to mm
-  static float raw_to_mm(const uint16_t v) { return v * float(ADC_VREF) * RECIPROCAL(float(MAX_RAW_THERMISTOR_VALUE)); }
+  static float raw_to_mm(const uint16_t v) { return v * (float(ADC_VREF_MV) / 1000.0f) * RECIPROCAL(float(MAX_RAW_THERMISTOR_VALUE)); }
   static float raw_to_mm() { return raw_to_mm(raw); }
 
   // A scaled reading is ready

Marlin/src/feature/power_monitor.h

@@ -46,11 +46,11 @@ struct pm_lpf_t {
 class PowerMonitor {
 private:
   #if ENABLED(POWER_MONITOR_CURRENT)
-    static constexpr float amps_adc_scale = float(ADC_VREF) / (POWER_MONITOR_VOLTS_PER_AMP * PM_SAMPLE_RANGE);
+    static constexpr float amps_adc_scale = (float(ADC_VREF_MV) / 1000.0f) / (POWER_MONITOR_VOLTS_PER_AMP * PM_SAMPLE_RANGE);
     static pm_lpf_t<amps_adc_scale, PM_K_VALUE, PM_K_SCALE> amps;
   #endif
   #if ENABLED(POWER_MONITOR_VOLTAGE)
-    static constexpr float volts_adc_scale = float(ADC_VREF) / (POWER_MONITOR_VOLTS_PER_VOLT * PM_SAMPLE_RANGE);
+    static constexpr float volts_adc_scale = (float(ADC_VREF_MV) / 1000.0f) / (POWER_MONITOR_VOLTS_PER_VOLT * PM_SAMPLE_RANGE);
     static pm_lpf_t<volts_adc_scale, PM_K_VALUE, PM_K_SCALE> volts;
   #endif
 

Marlin/src/inc/Conditionals_post.h

@@ -31,10 +31,10 @@
 #endif
 
 // ADC
-#ifdef BOARD_ADC_VREF
-  #define ADC_VREF BOARD_ADC_VREF
+#ifdef BOARD_ADC_VREF_MV
+  #define ADC_VREF_MV BOARD_ADC_VREF_MV
 #else
-  #define ADC_VREF HAL_ADC_VREF
+  #define ADC_VREF_MV HAL_ADC_VREF_MV
 #endif
 
 // Linear advance uses Jerk since E is an isolated axis

Marlin/src/inc/Warnings.cpp

@@ -750,10 +750,16 @@
   #warning "Input Shaping for CORE / MARKFORGED kinematic axes is still experimental."
 #endif
 
+/**
+ * Automatic Multistepping Limit
+ */
 #if MULTISTEPPING_LIMIT_WARNING
   #warning "MULTISTEPPING_LIMIT has been automatically set to 128. Use a lower value if the machine is slow to respond."
 #endif
 
+/**
+ * SD Card extras
+ */
 #if SDSORT_CACHE_VFATS_WARNING
   #warning "SDSORT_CACHE_VFATS has been reduced to VFAT_ENTRIES_LIMIT."
 #endif
@@ -768,6 +774,16 @@
   #warning "Place the firmware bin file in a folder named 'STM32F4_UPDATE' on the SD card. Install with 'M936 V2'."
 #endif
 
+/**
+ * ProUI Boot Screen Duration
+ */
 #if ENABLED(DWIN_LCD_PROUI) && BOOTSCREEN_TIMEOUT > 2000
   #warning "For ProUI the original BOOTSCREEN_TIMEOUT of 1100 is recommended."
 #endif
+
+/**
+ * AD595 Minimum Voltage
+ */
+#if HAL_ADC_VREF_MV < 5000 && ANY_THERMISTOR_IS(-1) && DISABLED(ALLOW_AD595_3V3_VREF)
+  #warning "The (-1) AD595 Thermocouple Amplifier requires 5V input supply! Use AD8495 for 3.3V ADC."
+#endif

Marlin/src/module/temperature.cpp

@@ -2142,8 +2142,10 @@ void Temperature::task() {
   UNUSED(ms);
 }
 
-#define TEMP_AD595(RAW)  ((RAW) * 5.0 * 100.0 / float(HAL_ADC_RANGE) / (OVERSAMPLENR) * (TEMP_SENSOR_AD595_GAIN) + TEMP_SENSOR_AD595_OFFSET)
-#define TEMP_AD8495(RAW) ((RAW) * 6.6 * 100.0 / float(HAL_ADC_RANGE) / (OVERSAMPLENR) * (TEMP_SENSOR_AD8495_GAIN) + TEMP_SENSOR_AD8495_OFFSET)
+// For a 5V input the AD595 returns a value scaled with 10mV per °C. (Minimum input voltage is 5V.)
+#define TEMP_AD595(RAW)  ((RAW) * (ADC_VREF_MV / 10) / float(HAL_ADC_RANGE) / (OVERSAMPLENR) * (TEMP_SENSOR_AD595_GAIN) + TEMP_SENSOR_AD595_OFFSET)
+// For a 5V input the AD8495 returns a value scaled with 5mV per °C. (Minimum input voltage is 2.7V.)
+#define TEMP_AD8495(RAW) ((RAW) * (ADC_VREF_MV /  5) / float(HAL_ADC_RANGE) / (OVERSAMPLENR) * (TEMP_SENSOR_AD8495_GAIN) + TEMP_SENSOR_AD8495_OFFSET)
 
 /**
  * Bisect search for the range of the 'raw' value, then interpolate

buildroot/tests/LPC1768

@@ -34,7 +34,7 @@ exec_test $1 $2 "MKS SBASE with SWITCHING_NOZZLE, Grbl Realtime Report" "$3"
 
 restore_configs
 opt_set MOTHERBOARD BOARD_RAMPS_14_RE_ARM_EEB \
-        EXTRUDERS 2 TEMP_SENSOR_1 -1 TEMP_SENSOR_BED 5 \
+        EXTRUDERS 2 TEMP_SENSOR_1 -4 TEMP_SENSOR_BED 5 \
         GRID_MAX_POINTS_X 16 \
         NOZZLE_TO_PROBE_OFFSET '{ 0, 0, 0 }' \
         NOZZLE_CLEAN_MIN_TEMP 170 \

buildroot/tests/LPC1769

@@ -14,7 +14,7 @@ exec_test $1 $2 "Azteeg X5GT Example Configuration" "$3"
 
 restore_configs
 opt_set MOTHERBOARD BOARD_SMOOTHIEBOARD \
-        EXTRUDERS 2 TEMP_SENSOR_0 -5 TEMP_SENSOR_1 -1 TEMP_SENSOR_BED 5 TEMP_0_CS_PIN P1_29 \
+        EXTRUDERS 2 TEMP_SENSOR_0 -5 TEMP_SENSOR_1 -4 TEMP_SENSOR_BED 5 TEMP_0_CS_PIN P1_29 \
         GRID_MAX_POINTS_X 16 \
         NOZZLE_CLEAN_START_POINT "{ {  10, 10, 3 }, {  10, 10, 3 } }" \
         NOZZLE_CLEAN_END_POINT "{ {  10, 20, 3 }, {  10, 20, 3 } }"
@@ -43,6 +43,7 @@ exec_test $1 $2 "Smoothieboard with TFTGLCD_PANEL_SPI and many features" "$3"
 restore_configs
 use_example_configs delta/generic
 opt_set MOTHERBOARD BOARD_COHESION3D_REMIX \
+        TEMP_SENSOR_0 1 \
         X_DRIVER_TYPE TMC2130 Y_DRIVER_TYPE TMC2130 Z_DRIVER_TYPE TMC2130 I_DRIVER_TYPE TB6560 \
         DEFAULT_AXIS_STEPS_PER_UNIT '{ 80, 80, 400, 500, 80 }' \
         DEFAULT_MAX_FEEDRATE '{ 300, 300, 5, 25, 300 }' \