diff --git a/main.c b/main.c
--- a/main.c
+++ b/main.c
@@ -29,14 +29,14 @@ uint32_t packet_sent=1;
 uint32_t packet_receive=1;
 
 
-char* itoa(int32_t i, char b[]){
+char* itoa(int16_t i, char b[]){
     char const digit[] = "0123456789";
     char* p = b;
     if(i<0){
         *p++ = '-';
         i *= -1;
     }
-    int shifter = i;
+    uint16_t shifter = i;
     do{ //Move to where representation ends
         ++p;
         shifter = shifter/10;
@@ -147,6 +147,7 @@ int32_t p = 1;
 int32_t i = 1;
 int32_t d = 1;
 
+
 // Process things
 void process()
 {
@@ -155,18 +156,38 @@ void process()
     Delay(1);
 
     // This may not clock at all... might need to send 16 bits first
-    SPI_I2S_SendData(SPI2, 0xAA); // send dummy data
-    SPI_I2S_SendData(SPI2, 0xAA); // send dummy data
-    uint16_t temp1 = SPI_I2S_ReceiveData(SPI2);
-//    SPI_I2S_SendData(SPI2, 0xAA); // send dummy data
-//    SPI_I2S_SendData(SPI2, 0xAA); // send dummy data
-    uint16_t temp2 = 0;//SPI_I2S_ReceiveData(SPI2);
+    SPI_I2S_SendData(SPI2, 0xAAAA); // send dummy data
+    //SPI_I2S_SendData(SPI2, 0xAA); // send dummy data
+    uint16_t temp_pre = SPI_I2S_ReceiveData(SPI2);
+
+    if(temp_pre & 0b0000000000000010) {
+        ssd1306_DrawString("Fatal Error", 3, 35);
+    }
+    else if(temp_pre & 0b0000000000000001) {
+        ssd1306_DrawString("TC Fault", 3, 35);
+    }
+    else {
+        ssd1306_DrawString("OK         ", 3, 35);
+    }
+
+    uint8_t sign = temp >> 15;// top bit is sign
+
+
+    temp_pre = temp_pre >> 2; // Drop 2 lowest bits
+
+    int16_t temp = 0;
+    if(sign) {
+        temp = -temp_pre;
+    }
+    else {
+        temp = temp_pre;
+    }
+
 
     // Deassert CS
     Delay(1);
     GPIO_SetBits(MAX_CS);
 
-    int32_t temp = (temp1 << 16) | temp2;
 
     //////////////////////////
     // Calc internal temp   //
@@ -186,29 +207,14 @@ void process()
     //////////////////////////
     // Calc external temp   //
     //////////////////////////
-    if(temp & 0x7) {
-        // Something is wrong...
-        ssd1306_DrawString("!TempCOMMS", 3, 35);
-    }
-
-    if(temp & 0x80000000) {
-        // Negative value, drop the lower 18 bits and explicitly extend sign bits
-        temp = 0xFFFFC000 | ((temp >> 18) & 0x00003FFFF);
-    }
-    else {
-        // Positive value, just drop lower 18
-        temp >>= 18;
-    }
-
-    double temp_centigrade = temp;
-
 
     if(temp > 0) {
         GPIO_SetBits(LED_STAT);
     }
     char tempstr[9];
-    itoa(temp, tempstr);
+    itoa(temp_pre, tempstr);
     ssd1306_DrawString("Temp: ", 1, 40);
+    ssd1306_DrawString("    ", 1, 70);
     ssd1306_DrawString(tempstr, 1, 70);
 
 /*