Alexandre Proulx / Mbed 2 deprecated I2C_Temp_sensor

Test

Dependencies:   mbed AccelSensor

main.cpp@2:3e6b509d7eca, 2013-01-15 (annotated)

Committer:
Alegrowin
Date:
Tue Jan 15 04:19:52 2013 +0000
Revision:
2:3e6b509d7eca
Parent:
1:60bb79c9a01e
Child:
3:4e4e4d7f6ee1
Fully functionnal I2C for temperature sensor

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Alegrowin 0:b325845b05af 1 #include "mbed.h"
Alegrowin 0:b325845b05af 2
Alegrowin 2:3e6b509d7eca 3 I2C i2c(p9, p10); // sda, scl
Alegrowin 0:b325845b05af 4 Serial pc(USBTX, USBRX); // tx, rx
Alegrowin 0:b325845b05af 5
Alegrowin 0:b325845b05af 6 const int addr = 0x9A; // define the I2C Address for TC74-A0
Alegrowin 0:b325845b05af 7
Alegrowin 0:b325845b05af 8 int main()
Alegrowin 0:b325845b05af 9 {
Alegrowin 0:b325845b05af 10 int temp = 0;
Alegrowin 0:b325845b05af 11 int a,b,c;
Alegrowin 0:b325845b05af 12 char cmd[2];
Alegrowin 0:b325845b05af 13
Alegrowin 1:60bb79c9a01e 14 wait(1); //Make sure system is fully initialized
Alegrowin 1:60bb79c9a01e 15
Alegrowin 2:3e6b509d7eca 16
Alegrowin 0:b325845b05af 17 while(1) {
Alegrowin 1:60bb79c9a01e 18 pc.printf("\r\n\nStart reading the temperature of TC74 on I2C\r\n");
Alegrowin 0:b325845b05af 19
Alegrowin 0:b325845b05af 20 //Méthode 1
Alegrowin 1:60bb79c9a01e 21 //Utilisation des fonctions bas niveau
Alegrowin 0:b325845b05af 22
Alegrowin 1:60bb79c9a01e 23 i2c.start(); // Start condition
Alegrowin 1:60bb79c9a01e 24 a = i2c.write(addr); // Write Device Address
Alegrowin 1:60bb79c9a01e 25 b = i2c.write(0x00); // Write READ command of TC74 (voir page 8 de la datasheet du TC74)
Alegrowin 1:60bb79c9a01e 26
Alegrowin 1:60bb79c9a01e 27 i2c.start(); //Reissue start condition
Alegrowin 1:60bb79c9a01e 28 //Au lieu de faire Stop condition et Start de nouveau
Alegrowin 0:b325845b05af 29
Alegrowin 1:60bb79c9a01e 30 c= i2c.write(addr|1); //Adresse du Device en mode Lecture
Alegrowin 1:60bb79c9a01e 31 temp = i2c.read(0); //Lecture de la valeur du registre de température
Alegrowin 1:60bb79c9a01e 32 i2c.stop(); //Fermeture de la trame
Alegrowin 0:b325845b05af 33
Alegrowin 0:b325845b05af 34 //Méthode 2
Alegrowin 1:60bb79c9a01e 35 //Utilisation des fonctions haut niveau
Alegrowin 1:60bb79c9a01e 36
Alegrowin 1:60bb79c9a01e 37 cmd[0] = 0x0; //Command :: READ
Alegrowin 1:60bb79c9a01e 38 cmd[1] = 0x0; //Param :: Unused in this case
Alegrowin 1:60bb79c9a01e 39 i2c.write(addr, cmd, 1); //Issue required command to perform a write of the command
Alegrowin 1:60bb79c9a01e 40 i2c.read(addr, cmd, 1); //Read the Data from the device
Alegrowin 0:b325845b05af 41
Alegrowin 1:60bb79c9a01e 42 //-----------------Print out section ----------------------
Alegrowin 1:60bb79c9a01e 43 //Display device Address and informations
Alegrowin 1:60bb79c9a01e 44 pc.printf("Device with address 0x%x with\r\n", addr);
Alegrowin 0:b325845b05af 45
Alegrowin 1:60bb79c9a01e 46 //Prints out the result of Method 1
Alegrowin 1:60bb79c9a01e 47 //pc.printf("ACK1 :: %d\n\rACK2 :: %d\n\rACK3 :: %d\n\r", a,b,c); //ACK bits
Alegrowin 1:60bb79c9a01e 48 pc.printf("Method 1 :: %d\n\r", temp);
Alegrowin 1:60bb79c9a01e 49
Alegrowin 1:60bb79c9a01e 50 //Prints out the Data from Method 2
Alegrowin 2:3e6b509d7eca 51 pc.printf("Method 2 :: %d\r\n\n", cmd[0]);
Alegrowin 0:b325845b05af 52
Alegrowin 1:60bb79c9a01e 53
Alegrowin 2:3e6b509d7eca 54
Alegrowin 0:b325845b05af 55 wait(1);
Alegrowin 0:b325845b05af 56 }
Alegrowin 0:b325845b05af 57 }