Diff: main.cpp

Revision:

0:5ca9b9abcaf3

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Dec 22 19:41:46 2010 +0000
@@ -0,0 +1,64 @@
+/*********************************
+**Read DS1624 Temperature Sensor**
+******Made by Stijn Sontrop*******
+**********22 Dec 2010*************
+**********************************/
+
+#include "mbed.h"
+#include <TextLCD.h> //Include the TextLCD lib (add this one to your project)
+
+
+//Address of DS1642: 1001 A2 A1 A0 R/W'
+//Example: 0x92 = Sensor with address 1
+//Make R/W' 0
+#define DS1642WRITEADDR 0x92
+//Make R/W' 1
+#define DS1642READADDR 0x93
+
+TextLCD lcd(p15, p16, p17, p18, p19, p20); //LCD Config rs, e, d4-d7
+
+I2C i2c(p9, p10); //SDA & SCL from I2C
+typedef struct { //Struct that contains the MSB en LSB value
+    char msb;
+    char lsb;
+} temperature;
+
+//Function that reads the temperature
+temperature readDS1624(void) {
+    temperature readval;
+    i2c.start();
+    i2c.write(DS1642WRITEADDR); //address
+    i2c.write(0xEE); //start conv T
+    i2c.stop();
+    wait_ms(2);
+    
+    i2c.start();
+    i2c.write(DS1642WRITEADDR); //Address
+    i2c.write(0xAA); //read temp command
+    i2c.stop();
+    wait_ms(1);
+    
+    i2c.start();
+    i2c.write(DS1642READADDR); //Write Address
+    readval.msb = i2c.read(1); //Read MSB + ACK
+    readval.lsb = i2c.read(0); //Read LSB + No ACK
+    i2c.stop();
+    readval.msb = readval.msb - 2; //Apparently you need to do -2 to get the right value
+    return readval; //Return value
+}
+
+int main() {
+    temperature readval;
+    i2c.start();
+    i2c.write(DS1642WRITEADDR); //b1001 A2 A1 A0 R/W'
+    i2c.write(0xAC); //access config
+    i2c.write(0x00); //continuous conversion
+    i2c.stop();
+    
+    while (1) {
+        readval = readDS1624(); //Call the readDS162 function
+        lcd.cls(); //Clear LCD
+        lcd.printf("Temp: %d\n%d", readval.msb, readval.lsb); //Print values to LCD
+        wait(0.3);
+    }
+}