diff --git a/Code/thermal_printer/Makefile b/Code/thermal_printer/Makefile
index e9365ae..4231fc2 100644
--- a/Code/thermal_printer/Makefile
+++ b/Code/thermal_printer/Makefile
@@ -3,7 +3,7 @@ CC = gcc
 CFLAGS  = -g -Wall
 LDFLAUS = 
 INCLUDES = 
-LIBS = -lwiringPi
+LIBS = -lwiringPi -lm
 
 MAIN = devterm_thermal_printer.elf
 
diff --git a/Code/thermal_printer/printer.c b/Code/thermal_printer/printer.c
index 8291a33..c56cd04 100644
--- a/Code/thermal_printer/printer.c
+++ b/Code/thermal_printer/printer.c
@@ -2,6 +2,7 @@
 #include <stdlib.h>
 #include <stdint.h> 
 #include <string.h>
+#include <math.h>
 
 #include <wiringPi.h>
 #include <wiringPiSPI.h>
@@ -101,7 +102,7 @@ uint8_t header_init() {
   
   //adc.setChannels(pin, 1); //this is actually the pin you want to measure
   
-  //pinMode(THERMISTORPIN,INPUT_ANALOG); // 数字io没有 模拟接口。adc 读温度暂时不搞 
+  pinMode(THERMISTORPIN,INPUT); // 数字io没有 模拟接口。adc 读温度暂时不搞 
   
   /*
   //SPI.begin(); //Initialize the SPI_1 port.
@@ -334,9 +335,9 @@ void print_dots_8bit(CONFIG*cfg,uint8_t *Array, uint8_t characters,uint8_t feed_
 
 uint16_t temperature() {
   
-  /*
+  
   double Rthermistor = 0, TempThermistor = 0;
-  uint16 ADCSamples=0;
+  uint16_t ADCSamples=0;
   int Sample = 1;
   uint16_t ADCConvertedValue;
 
@@ -358,9 +359,9 @@ uint16_t temperature() {
   TempThermistor = 1/TempThermistor;
 
   return  (uint16_t)(TempThermistor - 273.15);
-  */
   
-  return  (uint16_t)(0);
+  
+  //return  (uint16_t)(0);
 }