tmp007.cpp

00001 #include "mbed.h"
00002 
00003 #define    TMP007_Voltage     0x00 
00004 #define    TMP007_LocalTemp   0x01
00005 #define    TMP007_Conf        0x02
00006 #define    TMP007_ObjTemp     0x03
00007 
00008 #define    TMP007_ADDR 0x80
00009  
00010 I2C i2c(PA_10, PA_9);
00011  
00012 //DigitalOut myled(LED1);
00013  
00014 Serial pc(PA_2, PA_3);
00015 
00016 int16_t temp_c, temp_c_2s, voltage_tot, voltage_h, voltage_2s, voltage_tot_a;
00017 float celsius, farenheit, voltage;
00018 char temp_write[3];
00019 char temp_read[2];
00020 uint8_t temp_h, temp_l, temp_h_and, voltage_l, voltage_h_and; 
00021 int sign;
00022 
00023 //char TMP007_ObjTemp = 0x03;
00024 
00025  
00026 int main()
00027 {
00028  
00029 
00030  
00031     /* Configure the Temp Sensor:
00032 
00033     */
00034     temp_write[0] = TMP007_Conf;
00035     temp_write[2] = 0x40;   //Mode On, Alert, TC, 16 samples
00036     temp_write[1] = 0x19;   //check order of these (endianness)
00037     i2c.write(TMP007_ADDR, temp_write, 3, 0);
00038     
00039     while (1) {
00040         // Read Temp Sensor
00041         
00042         //Tell the temp sensor to take a one shot temperature measurement
00043         //temp_write[0] = LM75B_Conf;
00044         //temp_write[1] = 0x50;   //One shot, low power mode
00045         //i2c.write(LM75B_ADDR, temp_write, 2, 0);
00046         
00047         //Read Temperature Register
00048         temp_write[0] = TMP007_ObjTemp;
00049         i2c.write(TMP007_ADDR, temp_write, 1, false); // no stop (unsure)
00050         i2c.read(TMP007_ADDR, temp_read, 2, 0);
00051         
00052         temp_h = temp_read[0];
00053         temp_l = temp_read[1];
00054         
00055         pc.printf("Object Temperature\n");
00056         pc.printf("high bit = %x\n", temp_h);
00057         pc.printf("low bit = %x\n", temp_l);
00058         
00059         temp_c = ((temp_h) << 8) | temp_l;
00060         
00061         //int tempval = (int)((int)data_read[0] << 8) | data_read[1];
00062         pc.printf("combined bit = %x\n", temp_c);
00063         temp_h_and = temp_h & 0x80;
00064         //check for negative number        
00065         if (temp_h_and == 0x80)
00066         {
00067             
00068             //flip bits and add 1
00069             temp_c_2s = temp_c ^ 0x7FFF + 0x04;
00070             //temp_c_shift  = ((temp_c_2s)>>2);
00071             celsius = ((float)temp_c_2s * -0.25f) *.03125f;
00072             pc.printf("negative\n");
00073             pc.printf("anded high bit = %x\n", temp_h_and);         
00074          }       
00075         else 
00076         {
00077             //temp_c_shift = ((temp_c)>>2);
00078             //pc.printf("shifted bits: %x\n", temp_c_shift);
00079             celsius = ((float)temp_c * 0.25f) *.03125f;
00080             pc.printf("positive\n");
00081         }
00082         pc.printf("Capsule Temperature is: %f C\n", celsius);    
00083         farenheit = 1.8*celsius + 32;
00084         pc.printf("Capsule Temperature is: %f F\n\n", farenheit);
00085         
00086         //Read Internal Temperature Register
00087         temp_write[0] = TMP007_LocalTemp;
00088         i2c.write(TMP007_ADDR, temp_write, 1, false); // no stop (unsure)
00089         i2c.read(TMP007_ADDR, temp_read, 2, 0);
00090         
00091         temp_h = temp_read[0];
00092         temp_l = temp_read[1];
00093         
00094         pc.printf("Internal Temperature\n");
00095         pc.printf("high bit = %x\n", temp_h);
00096         pc.printf("low bit = %x\n", temp_l);
00097         
00098         temp_c = ((temp_h) << 8) | temp_l;
00099         
00100         //int tempval = (int)((int)data_read[0] << 8) | data_read[1];
00101         pc.printf("combined bit = %x\n", temp_c);
00102         temp_h_and = temp_h & 0x80;
00103         //check for negative number        
00104         if (temp_h_and == 0x80)
00105         {
00106             
00107             //flip bits and add 1
00108             temp_c_2s = temp_c ^ 0x7FFF + 0x04;
00109             //temp_c_shift  = ((temp_c_2s)>>2);
00110             //scale
00111             celsius = ((float)temp_c_2s * -0.25f) *.03125f;
00112             pc.printf("negative\n");
00113             //pc.printf("anded high bit = %x\n", temp_h_and);         
00114          }       
00115         else 
00116         {
00117             //temp_c_shift = ((temp_c)>>2);
00118             //pc.printf("shifted bits: %x\n", temp_c_shift);
00119             //scale
00120             celsius = ((float)temp_c * 0.25f) *.03125f;
00121             pc.printf("positive\n");
00122         }
00123         pc.printf("Internal Temperature is: %f C\n", celsius);    
00124         farenheit = 1.8*celsius + 32;
00125         pc.printf("Internal Temperature is: %f F\n\n", farenheit);
00126         
00127         //Read Voltage Register
00128         temp_write[0] = TMP007_Voltage;
00129         i2c.write(TMP007_ADDR, temp_write, 1, false); // no stop (unsure)
00130         i2c.read(TMP007_ADDR, temp_read, 2, 0);
00131         
00132         voltage_h = temp_read[0];
00133         voltage_l = temp_read[1];
00134         
00135         pc.printf("Sensor Voltage\n");
00136         pc.printf("high bit = %x\n", voltage_h);
00137         pc.printf("low bit = %x\n", voltage_l);
00138         
00139         voltage_tot = ((voltage_h) << 8) | voltage_l;
00140         voltage_tot_a = voltage_tot & 0x0000FFFF;
00141         
00142         //int tempval = (int)((int)data_read[0] << 8) | data_read[1];
00143         pc.printf("combined bit = %x\n", voltage_tot_a);
00144         voltage_h_and = voltage_h & 0x80;
00145         //check for negative number        
00146         if (voltage_h_and == 0x80)
00147         {
00148             
00149             //flip bits and add 1
00150             //voltage_2s = voltage_tot ^ 0x7FFF + 0x01;
00151             voltage_2s = ~voltage_tot_a + 0x01;
00152             pc.printf("2's compliment conversion: %x\n", voltage_2s);
00153             //temp_c_shift  = ((temp_c_2s)>>2);
00154             voltage = ((float)voltage_2s * -1.0f) *.00015625f;
00155             pc.printf("negative\n");
00156             //pc.printf("anded high bit = %x\n", temp_h_and);         
00157          }       
00158         else 
00159         {
00160             //temp_c_shift = ((temp_c)>>2);
00161             //pc.printf("shifted bits: %x\n", temp_c_shift);
00162             voltage = ((float)voltage_tot_a * 1.0f) *.00015625f;
00163             pc.printf("positive\n");
00164         }
00165         pc.printf("Sensor Voltage is: %f mV\n\n\n", voltage);    
00166         
00167         
00168         
00169         
00170         wait(4);    
00171     }
00172 }