diff --git a/max31855.c b/max31855.c
new file mode 100644
--- /dev/null
+++ b/max31855.c
@@ -0,0 +1,94 @@
+#include "stm32f0xx_hal.h"
+
+#include "config.h"
+#include "stringhelpers.h"
+#include "states.h"
+#include "gpio.h"
+
+// Grab temperature reading from MAX31855
+void max31855_readtemp(SPI_HandleTypeDef* hspi1, therm_settings_t* set, therm_status_t* status)
+{
+    // Assert CS
+    HAL_GPIO_WritePin(MAX_CS, 0);
+
+    uint8_t rxdatah[1] = {0x00};
+    uint8_t rxdatal[1] = {0x00};
+
+    HAL_SPI_Receive(hspi1, rxdatah, 1, 100);
+    HAL_SPI_Receive(hspi1, rxdatal, 1, 100);
+
+    // Release CS
+    HAL_GPIO_WritePin(MAX_CS, 1);
+
+    // Assemble data array into one var
+    uint16_t temp_pre = rxdatal[0] | (rxdatah[0]<<8);
+/*
+    if(temp_pre & 0b010) {
+        ssd1306_clearscreen();
+        HAL_Delay(400); // FIXME: remove?
+        status.tc_errno = 4;
+        status.state = STATE_TC_ERROR;
+        status.temp = 0;
+        status.temp_frac = 0;
+    } */
+    if(temp_pre & 0b001 && !set->ignore_tc_error) {
+        status->tc_errno = 1;
+        HAL_Delay(400); // FIXME: remove?
+        status->state_resume = status->state;
+        status->state = STATE_TC_ERROR;
+        status->temp = 0;
+        status->temp_frac = 0;
+    }/*
+    else if(temp_pre & 0b100 && !set.ignore_tc_error) {
+        status.tc_errno = 8;
+        HAL_Delay(400); // FIXME: remove?
+        status.state_resume = status.state;
+        status.state = STATE_TC_ERROR;
+        status.temp = 0;
+        status.temp_frac = 0;
+    }*/
+    else 
+    {
+        //if(status.state == STATE_TC_ERROR)
+        //{
+        //    status.state = status.state_resume;
+        //    ssd1306_clearscreen();
+        //}
+
+        uint8_t sign = status->temp >> 15;// top bit is sign
+
+        temp_pre = temp_pre >> 2; // Drop 2 lowest bits
+        status->temp_frac = temp_pre & 0b11; // get fractional part
+        status->temp_frac *= 25; // each bit is .25 a degree, up to fixed point
+        temp_pre = temp_pre >> 2; // Drop 2 fractional bits 
+
+        int8_t signint;
+
+        if(sign) {
+            signint = -1;
+        }
+        else {
+            signint = 1;
+        }
+
+        // Convert to Fahrenheit
+        if(set->temp_units == TEMP_UNITS_FAHRENHEIT)
+        {
+            status->temp = signint * ((temp_pre*100) + status->temp_frac);
+            status->temp = status->temp * 1.8;
+            status->temp += 3200;
+            status->temp_frac = status->temp % 100;
+            status->temp /= 100;
+            status->temp += set->temp_offset;
+        }
+
+        // Use Celsius values
+        else
+        {
+            status->temp = temp_pre * signint;
+            status->temp += set->temp_offset;
+        }
+    }
+}
+
+