Big temperature code update. No longer converts back and forwards between temperature and raw sample value. Reducing complexity, removing code. Also named some variables better. While keeping the safety intact and functionality the same.

12 years ago · 52158dffcc
3 changed files with 291 additions and 266 deletions
--- a/Marlin/temperature.cpp
+++ b/Marlin/temperature.cpp
@ -37,19 +37,14 @@
 //===========================================================================
 //=============================public variables============================
 //===========================================================================
-int target_raw[EXTRUDERS] = { 0 };
-int target_raw_bed = 0;
-#ifdef BED_LIMIT_SWITCHING
-int target_bed_low_temp =0;  
-int target_bed_high_temp =0;
-#endif
-int current_raw[EXTRUDERS] = { 0 };
-int current_raw_bed = 0;
+int target_temperature[EXTRUDERS] = { 0 };
+int target_temperature_bed = 0;
+int current_temperature_raw[EXTRUDERS] = { 0 };
+float current_temperature[EXTRUDERS] = { 0 };
+int current_temperature_bed_raw = 0;
+float current_temperature_bed = 0;

 #ifdef PIDTEMP
-  // used external
-  float pid_setpoint[EXTRUDERS] = { 0.0 };
-  
  float Kp=DEFAULT_Kp;
  float Ki=(DEFAULT_Ki*PID_dT);
  float Kd=(DEFAULT_Kd/PID_dT);
@ -59,9 +54,6 @@ int current_raw_bed = 0;
 #endif //PIDTEMP

 #ifdef PIDTEMPBED
-  // used external
-  float pid_setpoint_bed = { 0.0 };
-  
  float bedKp=DEFAULT_bedKp;
  float bedKi=(DEFAULT_bedKi*PID_dT);
  float bedKd=(DEFAULT_bedKd/PID_dT);
@ -116,12 +108,20 @@ static volatile bool temp_meas_ready = false;
 #endif

 // Init min and max temp with extreme values to prevent false errors during startup
-static int minttemp[EXTRUDERS] = ARRAY_BY_EXTRUDERS(0, 0, 0);
-static int maxttemp[EXTRUDERS] = ARRAY_BY_EXTRUDERS(16383, 16383, 16383); // the first value used for all
-static int bed_minttemp = 0;
-static int bed_maxttemp = 16383;
-static void *heater_ttbl_map[EXTRUDERS] = ARRAY_BY_EXTRUDERS((void *)heater_0_temptable, (void *)heater_1_temptable, (void *)heater_2_temptable);
-static int heater_ttbllen_map[EXTRUDERS] = ARRAY_BY_EXTRUDERS(heater_0_temptable_len, heater_1_temptable_len, heater_2_temptable_len);
+static int minttemp_raw[EXTRUDERS] = ARRAY_BY_EXTRUDERS( HEATER_0_RAW_LO_TEMP , HEATER_1_RAW_LO_TEMP , HEATER_2_RAW_LO_TEMP );
+static int maxttemp_raw[EXTRUDERS] = ARRAY_BY_EXTRUDERS( HEATER_0_RAW_HI_TEMP , HEATER_1_RAW_HI_TEMP , HEATER_2_RAW_HI_TEMP );
+static int minttemp[EXTRUDERS] = ARRAY_BY_EXTRUDERS( 0, 0, 0 );
+static int maxttemp[EXTRUDERS] = ARRAY_BY_EXTRUDERS( 16383, 16383, 16383 );
+//static int bed_minttemp_raw = HEATER_BED_RAW_LO_TEMP; /* No bed mintemp error implemented?!? */
+#ifdef BED_MAXTEMP
+static int bed_maxttemp_raw = HEATER_BED_RAW_HI_TEMP;
+#endif
+static void *heater_ttbl_map[EXTRUDERS] = ARRAY_BY_EXTRUDERS( (void *)HEATER_0_TEMPTABLE, (void *)HEATER_1_TEMPTABLE, (void *)HEATER_2_TEMPTABLE );
+static int heater_ttbllen_map[EXTRUDERS] = ARRAY_BY_EXTRUDERS( HEATER_0_TEMPTABLE_LEN, HEATER_1_TEMPTABLE_LEN, HEATER_2_TEMPTABLE_LEN );
+
+static float analog2temp(int raw, uint8_t e);
+static float analog2tempBed(int raw);
+static void updateTemperaturesFromRawValues();

 #ifdef WATCH_TEMP_PERIOD
 int watch_start_temp[EXTRUDERS] = ARRAY_BY_EXTRUDERS(0,0,0);
@ -179,13 +179,9 @@ void PID_autotune(float temp, int extruder, int ncycles)
 for(;;) {

    if(temp_meas_ready == true) { // temp sample ready
-      //Reset the watchdog after we know we have a temperature measurement.
-      watchdog_reset();
-      
-      CRITICAL_SECTION_START;
-      temp_meas_ready = false;
-      CRITICAL_SECTION_END;
-      input = (extruder<0)?analog2tempBed(current_raw_bed):analog2temp(current_raw[extruder], extruder);
+      updateTemperaturesFromRawValues();
+
+      input = (extruder<0)?current_temperature_bed:current_temperature[extruder];

      max=max(max,input);
      min=min(min,input);
@ -313,21 +309,16 @@ void manage_heater()
  if(temp_meas_ready != true)   //better readability
    return; 

-  //Reset the watchdog after we know we have a temperature measurement.
-  watchdog_reset();
-
-  CRITICAL_SECTION_START;
-  temp_meas_ready = false;
-  CRITICAL_SECTION_END;
+  updateTemperaturesFromRawValues();

  for(int e = 0; e < EXTRUDERS; e++) 
  {

  #ifdef PIDTEMP
-    pid_input = analog2temp(current_raw[e], e);
+    pid_input = current_temperature[e];

    #ifndef PID_OPENLOOP
-        pid_error[e] = pid_setpoint[e] - pid_input;
+        pid_error[e] = target_temperature[e] - pid_input;
        if(pid_error[e] > 10) {
          pid_output = PID_MAX;
          pid_reset[e] = true;
@ -354,20 +345,20 @@ void manage_heater()
          pid_output = constrain(pTerm[e] + iTerm[e] - dTerm[e], 0, PID_MAX);
        }
    #else 
-          pid_output = constrain(pid_setpoint[e], 0, PID_MAX);
+          pid_output = constrain(target_temperature[e], 0, PID_MAX);
    #endif //PID_OPENLOOP
    #ifdef PID_DEBUG
    SERIAL_ECHOLN(" PIDDEBUG "<<e<<": Input "<<pid_input<<" Output "<<pid_output" pTerm "<<pTerm[e]<<" iTerm "<<iTerm[e]<<" dTerm "<<dTerm[e]);  
    #endif //PID_DEBUG
  #else /* PID off */
    pid_output = 0;
-    if(current_raw[e] < target_raw[e]) {
+    if(current_temperature[e] < target_temperature[e]) {
      pid_output = PID_MAX;
    }
  #endif

    // Check if temperature is within the correct range
-    if((current_raw[e] > minttemp[e]) && (current_raw[e] < maxttemp[e])) 
+    if((current_temperature[e] > minttemp[e]) && (current_temperature[e] < maxttemp[e])) 
    {
      soft_pwm[e] = (int)pid_output >> 1;
    }
@ -393,19 +384,19 @@ void manage_heater()
  } // End extruder for loop
  

-		#ifndef PIDTEMPBED
+  #ifndef PIDTEMPBED
  if(millis() - previous_millis_bed_heater < BED_CHECK_INTERVAL)
    return;
  previous_millis_bed_heater = millis();
-    #endif
+  #endif

-  #if TEMP_BED_PIN > -1
+  #if TEMP_SENSOR_BED != 0
  
-		#ifdef PIDTEMPBED
-    pid_input = analog2tempBed(current_raw_bed);
+  #ifdef PIDTEMPBED
+    pid_input = current_temperature_bed;

    #ifndef PID_OPENLOOP
-		  pid_error_bed = pid_setpoint_bed - pid_input;
+		  pid_error_bed = target_temperature_bed - pid_input;
 		  pTerm_bed = bedKp * pid_error_bed;
 		  temp_iState_bed += pid_error_bed;
 		  temp_iState_bed = constrain(temp_iState_bed, temp_iState_min_bed, temp_iState_max_bed);
@ -419,10 +410,10 @@ void manage_heater()
 		  pid_output = constrain(pTerm_bed + iTerm_bed - dTerm_bed, 0, MAX_BED_POWER);

    #else 
-      pid_output = constrain(pid_setpoint_bed, 0, MAX_BED_POWER);
+      pid_output = constrain(target_temperature_bed, 0, MAX_BED_POWER);
    #endif //PID_OPENLOOP

-	  if((current_raw_bed > bed_minttemp) && (current_raw_bed < bed_maxttemp)) 
+	  if((current_temperature_bed > BED_MINTEMP) && (current_temperature_bed < BED_MAXTEMP)) 
 	  {
 	    soft_pwm_bed = (int)pid_output >> 1;
 	  }
@ -432,35 +423,38 @@ void manage_heater()

    #elif not defined BED_LIMIT_SWITCHING
      // Check if temperature is within the correct range
-      if((current_raw_bed > bed_minttemp) && (current_raw_bed < bed_maxttemp)) {
-        if(current_raw_bed >= target_raw_bed)
+      if((current_temperature_bed > BED_MAXTEMP) && (current_temperature_bed < BED_MINTEMP))
+      {
+        if(current_temperature_bed >= target_temperature_bed)
        {
-					soft_pwm_bed = 0;
+          soft_pwm_bed = 0;
        }
        else 
        {
-					soft_pwm_bed = MAX_BED_POWER>>1;
+          soft_pwm_bed = MAX_BED_POWER>>1;
        }
      }
-      else {
-					soft_pwm_bed = 0;
+      else
+      {
+        soft_pwm_bed = 0;
        WRITE(HEATER_BED_PIN,LOW);
      }
    #else //#ifdef BED_LIMIT_SWITCHING
      // Check if temperature is within the correct band
-      if((current_raw_bed > bed_minttemp) && (current_raw_bed < bed_maxttemp)) {
-        if(current_raw_bed > target_bed_high_temp)
+      if((current_temperature_bed > BED_MINTEMP) && (current_temperature_bed < BED_MAXTEMP))
+      {
+        if(current_temperature_bed > target_temperature_bed + BED_HYSTERESIS)
        {
-					soft_pwm_bed = 0;
+          soft_pwm_bed = 0;
        }
-        else 
-          if(current_raw_bed <= target_bed_low_temp)
+        else if(current_temperature_bed <= target_temperature_bed - BED_HYSTERESIS)
        {
-					soft_pwm_bed = MAX_BED_POWER>>1;
+          soft_pwm_bed = MAX_BED_POWER>>1;
        }
      }
-      else {
-					soft_pwm_bed = 0;
+      else
+      {
+        soft_pwm_bed = 0;
        WRITE(HEATER_BED_PIN,LOW);
      }
    #endif
@ -468,86 +462,9 @@ void manage_heater()
 }

 #define PGM_RD_W(x)   (short)pgm_read_word(&x)
-// Takes hot end temperature value as input and returns corresponding raw value. 
-// For a thermistor, it uses the RepRap thermistor temp table.
-// This is needed because PID in hydra firmware hovers around a given analog value, not a temp value.
-// This function is derived from inversing the logic from a portion of getTemperature() in FiveD RepRap firmware.
-int temp2analog(int celsius, uint8_t e) {
-  if(e >= EXTRUDERS)
-  {
-      SERIAL_ERROR_START;
-      SERIAL_ERROR((int)e);
-      SERIAL_ERRORLNPGM(" - Invalid extruder number!");
-      kill();
-  }
-  #ifdef HEATER_0_USES_MAX6675
-    if (e == 0)
-    {
-      return celsius * 4;
-    }
-  #endif
-  if(heater_ttbl_map[e] != 0)
-  {
-    int raw = 0;
-    byte i;
-    short (*tt)[][2] = (short (*)[][2])(heater_ttbl_map[e]);
-
-    for (i=1; i<heater_ttbllen_map[e]; i++)
-    {
-      if (PGM_RD_W((*tt)[i][1]) < celsius)
-      {
-        raw = PGM_RD_W((*tt)[i-1][0]) + 
-          (celsius - PGM_RD_W((*tt)[i-1][1])) * 
-          (PGM_RD_W((*tt)[i][0]) - PGM_RD_W((*tt)[i-1][0])) /
-          (PGM_RD_W((*tt)[i][1]) - PGM_RD_W((*tt)[i-1][1]));  
-        break;
-      }
-    }
-
-    // Overflow: Set to last value in the table
-    if (i == heater_ttbllen_map[e]) raw = PGM_RD_W((*tt)[i-1][0]);
-
-    return (1023 * OVERSAMPLENR) - raw;
-  }
-  return ((celsius-TEMP_SENSOR_AD595_OFFSET)/TEMP_SENSOR_AD595_GAIN) * (1024.0 / (5.0 * 100.0) ) * OVERSAMPLENR;
-}
-
-// Takes bed temperature value as input and returns corresponding raw value. 
-// For a thermistor, it uses the RepRap thermistor temp table.
-// This is needed because PID in hydra firmware hovers around a given analog value, not a temp value.
-// This function is derived from inversing the logic from a portion of getTemperature() in FiveD RepRap firmware.
-int temp2analogBed(int celsius) {
-#ifdef BED_USES_THERMISTOR
-    int raw = 0;
-    byte i;
-    
-    for (i=1; i<bedtemptable_len; i++)
-    {
-      if (PGM_RD_W(bedtemptable[i][1]) < celsius)
-      {
-        raw = PGM_RD_W(bedtemptable[i-1][0]) + 
-          (celsius - PGM_RD_W(bedtemptable[i-1][1])) * 
-          (PGM_RD_W(bedtemptable[i][0]) - PGM_RD_W(bedtemptable[i-1][0])) /
-          (PGM_RD_W(bedtemptable[i][1]) - PGM_RD_W(bedtemptable[i-1][1]));
-      
-        break;
-      }
-    }
-
-    // Overflow: Set to last value in the table
-    if (i == bedtemptable_len) raw = PGM_RD_W(bedtemptable[i-1][0]);
-
-    return (1023 * OVERSAMPLENR) - raw;
-#elif defined BED_USES_AD595
-    return lround(((celsius-TEMP_SENSOR_AD595_OFFSET)/TEMP_SENSOR_AD595_GAIN) * (1024.0 * OVERSAMPLENR/ (5.0 * 100.0) ) );
-#else
-    return 0;
-#endif
-}
-
 // Derived from RepRap FiveD extruder::getTemperature()
 // For hot end temperature measurement.
-float analog2temp(int raw, uint8_t e) {
+static float analog2temp(int raw, uint8_t e) {
  if(e >= EXTRUDERS)
  {
      SERIAL_ERROR_START;
@ -565,10 +482,9 @@ float analog2temp(int raw, uint8_t e) {
  if(heater_ttbl_map[e] != NULL)
  {
    float celsius = 0;
-    byte i;  
+    byte i;
    short (*tt)[][2] = (short (*)[][2])(heater_ttbl_map[e]);

-    raw = (1023 * OVERSAMPLENR) - raw;
    for (i=1; i<heater_ttbllen_map[e]; i++)
    {
      if (PGM_RD_W((*tt)[i][0]) > raw)
@ -591,13 +507,11 @@ float analog2temp(int raw, uint8_t e) {

 // Derived from RepRap FiveD extruder::getTemperature()
 // For bed temperature measurement.
-float analog2tempBed(int raw) {
+static float analog2tempBed(int raw) {
  #ifdef BED_USES_THERMISTOR
    float celsius = 0;
    byte i;

-    raw = (1023 * OVERSAMPLENR) - raw;
-
    for (i=1; i<bedtemptable_len; i++)
    {
      if (PGM_RD_W(bedtemptable[i][0]) > raw)
@ -621,6 +535,24 @@ float analog2tempBed(int raw) {
  #endif
 }

+/* Called to get the raw values into the the actual temperatures. The raw values are created in interrupt context,
+    and this function is called from normal context as it is too slow to run in interrupts and will block the stepper routine otherwise */
+static void updateTemperaturesFromRawValues()
+{
+    for(uint8_t e=0;e<EXTRUDERS;e++)
+    {
+        current_temperature[e] = analog2temp(current_temperature_raw[e], e);
+    }
+    current_temperature_bed = analog2tempBed(current_temperature_bed_raw);
+
+    //Reset the watchdog after we know we have a temperature measurement.
+    watchdog_reset();
+
+    CRITICAL_SECTION_START;
+    temp_meas_ready = false;
+    CRITICAL_SECTION_END;
+}
+
 void tp_init()
 {
  // Finish init of mult extruder arrays 
@ -716,31 +648,87 @@ void tp_init()
  delay(250);

 #ifdef HEATER_0_MINTEMP
-  minttemp[0] = temp2analog(HEATER_0_MINTEMP, 0);
+  minttemp[0] = HEATER_0_MINTEMP;
+  while(analog2temp(minttemp_raw[0], 0) < HEATER_0_MINTEMP) {
+#if HEATER_0_RAW_LO_TEMP < HEATER_0_RAW_HI_TEMP
+    minttemp_raw[0] += OVERSAMPLENR;
+#else
+    minttemp_raw[0] -= OVERSAMPLENR;
+#endif
+  }
 #endif //MINTEMP
 #ifdef HEATER_0_MAXTEMP
-  maxttemp[0] = temp2analog(HEATER_0_MAXTEMP, 0);
+  maxttemp[0] = HEATER_0_MAXTEMP;
+  while(analog2temp(maxttemp_raw[0], 0) > HEATER_0_MAXTEMP) {
+#if HEATER_0_RAW_LO_TEMP < HEATER_0_RAW_HI_TEMP
+    maxttemp_raw[0] -= OVERSAMPLENR;
+#else
+    maxttemp_raw[0] += OVERSAMPLENR;
+#endif
+  }
 #endif //MAXTEMP

 #if (EXTRUDERS > 1) && defined(HEATER_1_MINTEMP)
-  minttemp[1] = temp2analog(HEATER_1_MINTEMP, 1);
+  minttemp[1] = HEATER_1_MINTEMP;
+  while(analog2temp(minttemp_raw[1], 1) > HEATER_1_MINTEMP) {
+#if HEATER_1_RAW_LO_TEMP < HEATER_1_RAW_HI_TEMP
+    minttemp_raw[1] += OVERSAMPLENR;
+#else
+    minttemp_raw[1] -= OVERSAMPLENR;
+#endif
+  }
 #endif // MINTEMP 1
 #if (EXTRUDERS > 1) && defined(HEATER_1_MAXTEMP)
-  maxttemp[1] = temp2analog(HEATER_1_MAXTEMP, 1);
+  maxttemp[1] = HEATER_1_MAXTEMP;
+  while(analog2temp(maxttemp_raw[1], 1) > HEATER_1_MAXTEMP) {
+#if HEATER_1_RAW_LO_TEMP < HEATER_1_RAW_HI_TEMP
+    maxttemp_raw[1] -= OVERSAMPLENR;
+#else
+    maxttemp_raw[1] += OVERSAMPLENR;
+#endif
+  }
 #endif //MAXTEMP 1

 #if (EXTRUDERS > 2) && defined(HEATER_2_MINTEMP)
-  minttemp[2] = temp2analog(HEATER_2_MINTEMP, 2);
+  minttemp[2] = HEATER_2_MINTEMP;
+  while(analog2temp(minttemp_raw[2], 2) > HEATER_2_MINTEMP) {
+#if HEATER_2_RAW_LO_TEMP < HEATER_2_RAW_HI_TEMP
+    minttemp_raw[2] += OVERSAMPLENR;
+#else
+    minttemp_raw[2] -= OVERSAMPLENR;
+#endif
+  }
 #endif //MINTEMP 2
 #if (EXTRUDERS > 2) && defined(HEATER_2_MAXTEMP)
-  maxttemp[2] = temp2analog(HEATER_2_MAXTEMP, 2);
+  maxttemp[2] = HEATER_2_MAXTEMP;
+  while(analog2temp(maxttemp_raw[2], 2) > HEATER_2_MAXTEMP) {
+#if HEATER_2_RAW_LO_TEMP < HEATER_2_RAW_HI_TEMP
+    maxttemp_raw[2] -= OVERSAMPLENR;
+#else
+    maxttemp_raw[2] += OVERSAMPLENR;
+#endif
+  }
 #endif //MAXTEMP 2

 #ifdef BED_MINTEMP
-  bed_minttemp = temp2analogBed(BED_MINTEMP);
+  /* No bed MINTEMP error implemented?!? */ /*
+  while(analog2tempBed(bed_minttemp_raw) < BED_MINTEMP) {
+#if HEATER_BED_RAW_LO_TEMP < HEATER_BED_RAW_HI_TEMP
+    bed_minttemp_raw += OVERSAMPLENR;
+#else
+    bed_minttemp_raw -= OVERSAMPLENR;
+#endif
+  }
+  */
 #endif //BED_MINTEMP
 #ifdef BED_MAXTEMP
-  bed_maxttemp = temp2analogBed(BED_MAXTEMP);
+  while(analog2tempBed(bed_maxttemp_raw) > BED_MAXTEMP) {
+#if HEATER_BED_RAW_LO_TEMP < HEATER_BED_RAW_HI_TEMP
+    bed_maxttemp_raw -= OVERSAMPLENR;
+#else
+    bed_maxttemp_raw += OVERSAMPLENR;
+#endif
+  }
 #endif //BED_MAXTEMP
 }

@ -765,7 +753,7 @@ void disable_heater()
    setTargetHotend(0,i);
  setTargetBed(0);
  #if TEMP_0_PIN > -1
-  target_raw[0]=0;
+  target_temperature[0]=0;
  soft_pwm[0]=0;
   #if HEATER_0_PIN > -1  
     WRITE(HEATER_0_PIN,LOW);
@ -773,7 +761,7 @@ void disable_heater()
  #endif
     
  #if TEMP_1_PIN > -1
-    target_raw[1]=0;
+    target_temperature[1]=0;
    soft_pwm[1]=0;
    #if HEATER_1_PIN > -1 
      WRITE(HEATER_1_PIN,LOW);
@ -781,7 +769,7 @@ void disable_heater()
  #endif
      
  #if TEMP_2_PIN > -1
-    target_raw[2]=0;
+    target_temperature[2]=0;
    soft_pwm[2]=0;
    #if HEATER_2_PIN > -1  
      WRITE(HEATER_2_PIN,LOW);
@ -789,7 +777,7 @@ void disable_heater()
  #endif 

  #if TEMP_BED_PIN > -1
-    target_raw_bed=0;
+    target_temperature_bed=0;
    soft_pwm_bed=0;
    #if HEATER_BED_PIN > -1  
      WRITE(HEATER_BED_PIN,LOW);
@ -1031,33 +1019,16 @@ ISR(TIMER0_COMPB_vect)
    
  if(temp_count >= 16) // 8 ms * 16 = 128ms.
  {
-    #if defined(HEATER_0_USES_AD595) || defined(HEATER_0_USES_MAX6675)
-      current_raw[0] = raw_temp_0_value;
-    #else
-      current_raw[0] = 16383 - raw_temp_0_value;
-    #endif
-
-#if EXTRUDERS > 1    
-    #ifdef HEATER_1_USES_AD595
-      current_raw[1] = raw_temp_1_value;
-    #else
-      current_raw[1] = 16383 - raw_temp_1_value;
-    #endif
+    if (!temp_meas_ready) //Only update the raw values if they have been read. Else we could be updating them during reading.
+    {
+      current_temperature_raw[0] = raw_temp_0_value;
+#if EXTRUDERS > 1
+      current_temperature_raw[1] = raw_temp_0_value;
 #endif
-    
 #if EXTRUDERS > 2
-    #ifdef HEATER_2_USES_AD595
-      current_raw[2] = raw_temp_2_value;
-    #else
-      current_raw[2] = 16383 - raw_temp_2_value;
-    #endif
+      current_temperature_raw[2] = raw_temp_0_value;
 #endif
-    
-    #ifdef BED_USES_AD595
-      current_raw_bed = raw_temp_bed_value;
-    #else
-      current_raw_bed = 16383 - raw_temp_bed_value;
-    #endif
+    }
    
    temp_meas_ready = true;
    temp_count = 0;
@ -1066,23 +1037,63 @@ ISR(TIMER0_COMPB_vect)
    raw_temp_2_value = 0;
    raw_temp_bed_value = 0;

-    for(unsigned char e = 0; e < EXTRUDERS; e++) {
-       if(current_raw[e] >= maxttemp[e]) {
-          target_raw[e] = 0;
-          max_temp_error(e);
-       }
-       if(current_raw[e] <= minttemp[e]) {
-          target_raw[e] = 0;
-          min_temp_error(e);
-       }
+#if HEATER_0_RAW_LO_TEMP > HEATER_0_RAW_HI_TEMP
+    if(current_temperature_raw[0] <= maxttemp_raw[0]) {
+#else
+    if(current_temperature_raw[0] >= maxttemp_raw[0]) {
+#endif
+        max_temp_error(0);
+    }
+#if HEATER_0_RAW_LO_TEMP > HEATER_0_RAW_HI_TEMP
+    if(current_temperature_raw[0] >= minttemp_raw[0]) {
+#else
+    if(current_temperature_raw[0] <= minttemp_raw[0]) {
+#endif
+        min_temp_error(0);
+    }
+#if EXTRUDERS > 1
+#if HEATER_1_RAW_LO_TEMP > HEATER_1_RAW_HI_TEMP
+    if(current_temperature_raw[1] <= maxttemp_raw[1]) {
+#else
+    if(current_temperature_raw[1] >= maxttemp_raw[1]) {
+#endif
+        max_temp_error(1);
    }
+#if HEATER_1_RAW_LO_TEMP > HEATER_1_RAW_HI_TEMP
+    if(current_temperature_raw[1] >= minttemp_raw[1]) {
+#else
+    if(current_temperature_raw[1] <= minttemp_raw[1]) {
+#endif
+        min_temp_error(1);
+    }
+#endif
+#if EXTRUDERS > 2
+#if HEATER_2_RAW_LO_TEMP > HEATER_2_RAW_HI_TEMP
+    if(current_temperature_raw[2] <= maxttemp_raw[2]) {
+#else
+    if(current_temperature_raw[2] >= maxttemp_raw[2]) {
+#endif
+        max_temp_error(2);
+    }
+#if HEATER_2_RAW_LO_TEMP > HEATER_2_RAW_HI_TEMP
+    if(current_temperature_raw[2] >= minttemp_raw[2]) {
+#else
+    if(current_temperature_raw[2] <= minttemp_raw[2]) {
+#endif
+        min_temp_error(2);
+    }
+#endif
  
-#if defined(BED_MAXTEMP) && (HEATER_BED_PIN > -1)
-    if(current_raw_bed >= bed_maxttemp) {
-       target_raw_bed = 0;
+  /* No bed MINTEMP error? */
+#if defined(BED_MAXTEMP) && (TEMP_SENSOR_BED != 0)
+# if HEATER_BED_RAW_LO_TEMP > HEATER_BED_RAW_HI_TEMP
+    if(current_temperature_bed <= bed_maxttemp_raw) {
+#else
+    if(current_temperature_bed >= bed_maxttemp_raw) {
+#endif
+       target_temperature_bed = 0;
       bed_max_temp_error();
    }
 #endif
-  }
+  }  
 }
-
--- a/Marlin/temperature.h
+++ b/Marlin/temperature.h
@ -33,27 +33,16 @@ void manage_heater(); //it is critical that this is called periodically.

 //low leven conversion routines
 // do not use this routines and variables outsie of temperature.cpp
-int temp2analog(int celsius, uint8_t e);
-int temp2analogBed(int celsius);
-float analog2temp(int raw, uint8_t e);
-float analog2tempBed(int raw);
-extern int target_raw[EXTRUDERS];  
-extern int heatingtarget_raw[EXTRUDERS];  
-extern int current_raw[EXTRUDERS];
-extern int target_raw_bed;
-extern int current_raw_bed;
-#ifdef BED_LIMIT_SWITCHING
-  extern int target_bed_low_temp ;  
-  extern int target_bed_high_temp ;
-#endif
+extern int target_temperature[EXTRUDERS];  
+extern float current_temperature[EXTRUDERS];
+extern int target_temperature_bed;
+extern float current_temperature_bed;

 #ifdef PIDTEMP
  extern float Kp,Ki,Kd,Kc;
-  extern float pid_setpoint[EXTRUDERS];
 #endif
 #ifdef PIDTEMPBED
  extern float bedKp,bedKi,bedKd;
-  extern float pid_setpoint_bed;
 #endif
  
 //high level conversion routines, for use outside of temperature.cpp
@ -61,61 +50,43 @@ extern int current_raw_bed;
 //deg=degreeCelsius

 FORCE_INLINE float degHotend(uint8_t extruder) {  
-  return analog2temp(current_raw[extruder], extruder);
+  return current_temperature[extruder];
 };

 FORCE_INLINE float degBed() {
-  return analog2tempBed(current_raw_bed);
+  return current_temperature_bed;
 };

 FORCE_INLINE float degTargetHotend(uint8_t extruder) {  
-  return analog2temp(target_raw[extruder], extruder);
+  return target_temperature[extruder];
 };

 FORCE_INLINE float degTargetBed() {   
-  return analog2tempBed(target_raw_bed);
+  return target_temperature_bed;
 };

 FORCE_INLINE void setTargetHotend(const float &celsius, uint8_t extruder) {  
-  target_raw[extruder] = temp2analog(celsius, extruder);
-#ifdef PIDTEMP
-  pid_setpoint[extruder] = celsius;
-#endif //PIDTEMP
+  target_temperature[extruder] = celsius;
 };

 FORCE_INLINE void setTargetBed(const float &celsius) {  
-  
-  target_raw_bed = temp2analogBed(celsius);
-	#ifdef PIDTEMPBED
-  pid_setpoint_bed = celsius;
-  #elif defined BED_LIMIT_SWITCHING
-    if(celsius>BED_HYSTERESIS)
-    {
-    target_bed_low_temp= temp2analogBed(celsius-BED_HYSTERESIS);
-    target_bed_high_temp= temp2analogBed(celsius+BED_HYSTERESIS);
-    }
-    else
-    { 
-      target_bed_low_temp=0;
-      target_bed_high_temp=0;
-    }
-  #endif
+  target_temperature_bed = celsius;
 };

 FORCE_INLINE bool isHeatingHotend(uint8_t extruder){  
-  return target_raw[extruder] > current_raw[extruder];
+  return target_temperature[extruder] > current_temperature[extruder];
 };

 FORCE_INLINE bool isHeatingBed() {
-  return target_raw_bed > current_raw_bed;
+  return target_temperature_bed > current_temperature_bed;
 };

 FORCE_INLINE bool isCoolingHotend(uint8_t extruder) {  
-  return target_raw[extruder] < current_raw[extruder];
+  return target_temperature[extruder] < current_temperature[extruder];
 };

 FORCE_INLINE bool isCoolingBed() {
-  return target_raw_bed < current_raw_bed;
+  return target_temperature_bed < current_temperature_bed;
 };

 #define degHotend0() degHotend(0)
--- a/Marlin/thermistortables.h
+++ b/Marlin/thermistortables.h
@ -461,49 +461,92 @@ const short temptable_55[][2] PROGMEM = {
 #define TT_NAME(_N) _TT_NAME(_N)

 #ifdef THERMISTORHEATER_0
-  #define heater_0_temptable TT_NAME(THERMISTORHEATER_0)
-  #define heater_0_temptable_len (sizeof(heater_0_temptable)/sizeof(*heater_0_temptable))
+# define HEATER_0_TEMPTABLE TT_NAME(THERMISTORHEATER_0)
+# define HEATER_0_TEMPTABLE_LEN (sizeof(HEATER_0_TEMPTABLE)/sizeof(*HEATER_0_TEMPTABLE))
 #else
-#ifdef HEATER_0_USES_THERMISTOR
-  #error No heater 0 thermistor table specified
-#else  // HEATER_0_USES_THERMISTOR
-  #define heater_0_temptable 0
-  #define heater_0_temptable_len 0
-#endif // HEATER_0_USES_THERMISTOR
+# ifdef HEATER_0_USES_THERMISTOR
+#  error No heater 0 thermistor table specified
+# else  // HEATER_0_USES_THERMISTOR
+#  define HEATER_0_TEMPTABLE NULL
+#  define HEATER_0_TEMPTABLE_LEN 0
+# endif // HEATER_0_USES_THERMISTOR
+#endif
+
+//Set the high and low raw values for the heater, this indicates which raw value is a high or low temperature
+#ifndef HEATER_0_RAW_HI_TEMP
+# if HEATER_0_USES_THERMISTOR   //In case of a thermistor the highest temperature results in the lowest ADC value
+#  define HEATER_0_RAW_HI_TEMP 0
+#  define HEATER_0_RAW_LO_TEMP 16383
+# else                          //In case of an thermocouple the highest temperature results in the highest ADC value
+#  define HEATER_0_RAW_HI_TEMP 16383
+#  define HEATER_0_RAW_LO_TEMP 0
+# endif
 #endif

 #ifdef THERMISTORHEATER_1
-  #define heater_1_temptable TT_NAME(THERMISTORHEATER_1)
-  #define heater_1_temptable_len (sizeof(heater_1_temptable)/sizeof(*heater_1_temptable))
+# define HEATER_1_TEMPTABLE TT_NAME(THERMISTORHEATER_1)
+# define HEATER_1_TEMPTABLE_LEN (sizeof(HEATER_1_TEMPTABLE)/sizeof(*HEATER_1_TEMPTABLE))
 #else
-#ifdef HEATER_1_USES_THERMISTOR
-  #error No heater 1 thermistor table specified
-#else  // HEATER_1_USES_THERMISTOR
-  #define heater_1_temptable 0
-  #define heater_1_temptable_len 0
-#endif // HEATER_1_USES_THERMISTOR
+# ifdef HEATER_1_USES_THERMISTOR
+#  error No heater 1 thermistor table specified
+# else  // HEATER_1_USES_THERMISTOR
+#  define HEATER_1_TEMPTABLE NULL
+#  define HEATER_1_TEMPTABLE_LEN 0
+# endif // HEATER_1_USES_THERMISTOR
+#endif
+
+//Set the high and low raw values for the heater, this indicates which raw value is a high or low temperature
+#ifndef HEATER_1_RAW_HI_TEMP
+# if HEATER_1_USES_THERMISTOR   //In case of a thermistor the highest temperature results in the lowest ADC value
+#  define HEATER_1_RAW_HI_TEMP 0
+#  define HEATER_1_RAW_LO_TEMP 16383
+# else                          //In case of an thermocouple the highest temperature results in the highest ADC value
+#  define HEATER_1_RAW_HI_TEMP 16383
+#  define HEATER_1_RAW_LO_TEMP 0
+# endif
 #endif

 #ifdef THERMISTORHEATER_2
-  #define heater_2_temptable TT_NAME(THERMISTORHEATER_2)
-  #define heater_2_temptable_len (sizeof(heater_2_temptable)/sizeof(*heater_2_temptable))
+# define HEATER_2_TEMPTABLE TT_NAME(THERMISTORHEATER_2)
+# define HEATER_2_TEMPTABLE_LEN (sizeof(HEATER_2_TEMPTABLE)/sizeof(*HEATER_2_TEMPTABLE))
 #else
-#ifdef HEATER_2_USES_THERMISTOR
-  #error No heater 2 thermistor table specified
-#else  // HEATER_2_USES_THERMISTOR
-  #define heater_2_temptable 0
-  #define heater_2_temptable_len 0
-#endif // HEATER_2_USES_THERMISTOR
+# ifdef HEATER_2_USES_THERMISTOR
+#  error No heater 2 thermistor table specified
+# else  // HEATER_2_USES_THERMISTOR
+#  define HEATER_2_TEMPTABLE NULL
+#  define HEATER_2_TEMPTABLE_LEN 0
+# endif // HEATER_2_USES_THERMISTOR
+#endif
+
+//Set the high and low raw values for the heater, this indicates which raw value is a high or low temperature
+#ifndef HEATER_2_RAW_HI_TEMP
+# if HEATER_2_USES_THERMISTOR   //In case of a thermistor the highest temperature results in the lowest ADC value
+#  define HEATER_2_RAW_HI_TEMP 0
+#  define HEATER_2_RAW_LO_TEMP 16383
+# else                          //In case of an thermocouple the highest temperature results in the highest ADC value
+#  define HEATER_2_RAW_HI_TEMP 16383
+#  define HEATER_2_RAW_LO_TEMP 0
+# endif
 #endif

 #ifdef THERMISTORBED
-  #define bedtemptable TT_NAME(THERMISTORBED)
-  #define bedtemptable_len (sizeof(bedtemptable)/sizeof(*bedtemptable))
+# define BEDTEMPTABLE TT_NAME(THERMISTORBED)
+# define BEDTEMPTABLE_LEN (sizeof(BEDTEMPTABLE)/sizeof(*BEDTEMPTABLE))
 #else
-#ifdef BED_USES_THERMISTOR
-  #error No bed thermistor table specified
-#endif // BED_USES_THERMISTOR
+# ifdef BED_USES_THERMISTOR
+#  error No bed thermistor table specified
+# endif // BED_USES_THERMISTOR
 #endif

-#endif //THERMISTORTABLES_H_
+//Set the high and low raw values for the heater, this indicates which raw value is a high or low temperature
+#ifndef HEATER_BED_RAW_HI_TEMP
+# if BED_USES_THERMISTOR   //In case of a thermistor the highest temperature results in the lowest ADC value
+#  define HEATER_BED_RAW_HI_TEMP 0
+#  define HEATER_BED_RAW_LO_TEMP 16383
+# else                          //In case of an thermocouple the highest temperature results in the highest ADC value
+#  define HEATER_BED_RAW_HI_TEMP 16383
+#  define HEATER_BED_RAW_LO_TEMP 0
+# endif
+#endif

+#endif //THERMISTORTABLES_H_