diff --git a/max31865.c b/max31865.c
--- a/max31865.c
+++ b/max31865.c
@@ -61,8 +61,6 @@ void max31865_readtemp(SPI_HandleTypeDef
         // 2-wire RTC or 2-wire (duh) NTC thermistor will be the only options
         // Need option for resistance of RTD
         // These options should be stored in the set structure and should be menu-selectable
-    // TODO: Read RTD msbs (0x01)
-    // TODO: Read RTD LSBs (0x02)
 
     // Assert CS
     HAL_GPIO_WritePin(MAX_CS, 0);
@@ -80,7 +78,7 @@ void max31865_readtemp(SPI_HandleTypeDef
     HAL_GPIO_WritePin(MAX_CS, 1);
 
     // Assemble data array into one var
-    uint16_t temp_pre = (rxdatah[0]<<8) | rxdatal[0];
+    uint16_t adc_count = ((rxdatah[0] & 0x7F) << 8) | rxdatal[0];
     
     if((rxdatah[0] & 0x80) && !set->val.ignore_error) {
 
@@ -89,7 +87,7 @@ void max31865_readtemp(SPI_HandleTypeDef
 
         uint8_t reg = MAX31865_REG_FAULTSTATUS;
 
-        uint8_t data[1] = {0x11};
+        uint8_t data[1] = {0x00};
 
         HAL_SPI_Transmit(hspi1, &reg, 1, 100);
         HAL_SPI_Receive(hspi1, data, 1, 100);
@@ -108,31 +106,48 @@ void max31865_readtemp(SPI_HandleTypeDef
     }
     else 
     {
-        // Convert to decimal
-        //temp_pre = temp_pre >> 1;
-        uint16_t adc_count = temp_pre & 0x7FFF; //do some scaling?
-
         // Convert to Fahrenheit
         if(set->val.temp_units == TEMP_UNITS_FAHRENHEIT)
         {
-            status->temp = adc_count;
-            //convert to fahrenheit
+        	//use all fixed point math!
+
+        	//convert adc to resistance
+        	//Rrtd = adc / range * Rref
+        	status->temp = adc_count * 9830 * 10;
+        	status->temp /= 32768;
+        	//resistance to temp
+        	//(x - in1) * (cal2 - cal1) / (in2 - in1) + cal1
+        	status->temp = ((status->temp * 100) - 100000) * (39200 - 3200) / (175860 - 100000) + 3200;
+        	//grab the fraction
+        	status->temp_frac = (status->temp / 10) % 10;
+        	//scale back to degrees
+        	status->temp = status->temp / 100;
+        	//add in the offset
             status->temp += set->val.temp_offset;
         }
 
-        // Use Celsius values
+        // Convert to Celsius
         else
         {
-            //convert to celsius
-            int32_t temp = (((int32_t) adc_count) / 32) - 256;
-            status->temp = temp;
+        	//use all fixed point math!
+
+        	//convert adc to resistance
+        	//Rrtd = adc / range * Rref
+        	status->temp = adc_count * 9830 * 10;
+        	status->temp /= 32768;
+        	//resistance to temp
+        	//(x - in1) * (cal2 - cal1) / (in2 - in1) + cal1
+        	status->temp = ((status->temp * 10) - 10000) * (20000 - 0) / (17586 - 10000) + 0;
+        	//grab the fraction
+        	status->temp_frac = (status->temp / 10) % 10;
+        	//scale back to degrees
+        	status->temp = status->temp / 100;
+        	//add in the offset
             status->temp += set->val.temp_offset;
         }
     }
 
 
-
-
 }
 
 // vim:softtabstop=4 shiftwidth=4 expandtab