diff --git a/firmware/masterchip/main.c b/firmware/masterchip/main.c
index e7eee06..5f25993 100644
--- a/firmware/masterchip/main.c
+++ b/firmware/masterchip/main.c
@@ -17,7 +17,7 @@
 #include "main.h"
 
 uint8_t newThermoData = 1;
-uint16_t thermoData[];
+uint16_t thermoData[4];
 
 
 void hardinit() {
@@ -79,6 +79,7 @@ int __attribute__((noreturn)) main(void) {
 		uint16_t recv;
 		for(int i=0; i<4; i++) {
 			thermoData[i] = spi_master_transceive(7, i, 0);
+            usbPoll();
 		}
 		newThermoData = 1;
     }
diff --git a/firmware/masterchip/usb.c b/firmware/masterchip/usb.c
index f1bbfc5..e95f15e 100644
--- a/firmware/masterchip/usb.c
+++ b/firmware/masterchip/usb.c
@@ -13,17 +13,17 @@ usbMsgLen_t usbFunctionSetup(uchar data[8]) {
   uint16_t recv;
 
   if(rq->bRequest == 100) {
-    dataBuffer[0] = (thermoData [0] & 0xff00)>>8;
-    dataBuffer[1] = thermoData [0] & 0x00ff;
-    dataBuffer[2] = (thermoData [1] & 0xff00)>>8;
-    dataBuffer[3] = thermoData [1] & 0x00ff;
+    dataBuffer[0] = (thermoData[0] & 0xff00)>>8;
+    dataBuffer[1] = thermoData[0] & 0x00ff;
+    dataBuffer[2] = (thermoData[1] & 0xff00)>>8;
+    dataBuffer[3] = thermoData[1] & 0x00ff;
     usbMsgPtr = dataBuffer;
     return 4;
   } else if(rq->bRequest == 101) {
-    dataBuffer[0] = (thermoData [2] & 0xff00)>>8;
-    dataBuffer[1] = thermoData [2] & 0x00ff;
-    dataBuffer[2] = (thermoData [3] & 0xff00)>>8;
-    dataBuffer[3] = thermoData [3] & 0x00ff;
+    dataBuffer[0] = (thermoData[2] & 0xff00)>>8;
+    dataBuffer[1] = thermoData[2] & 0x00ff;
+    dataBuffer[2] = (thermoData[3] & 0xff00)>>8;
+    dataBuffer[3] = thermoData[3] & 0x00ff;
     usbMsgPtr = dataBuffer;
     return 4;
   } else {