Diff: main.cpp

Revision:

0:f00aca3e58e1

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Dec 22 19:53:51 2010 +0000
@@ -0,0 +1,60 @@
+/*********************************
+**Read DS1631 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)
+
+///DS1631 Address:
+//Formation: 1001 A2 A1 A0 R/W'
+//Write: Make R/W' 0
+#define DS1631WRITEADDRESS 0x90
+//Read: Make R/W' 1
+#define DS1631READADDRESS 0x91
+
+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 to contain read values
+    char msb;
+    char lsb;
+} temperature;
+
+temperature readds1631(void) {
+    temperature readval;
+    i2c.start();
+    i2c.write(DS1631WRITEADDRESS);
+    i2c.write(0xAA); //Read the temperature
+    i2c.stop();
+    wait_ms(1);
+    i2c.start();
+    i2c.write(DS1631READADDRESS);
+    readval.msb = i2c.read(1); //Read the MSB (and do an ACK)
+    readval.lsb = i2c.read(0); //Read the LSB (and don't do an ACK)
+    i2c.stop();
+    readval.msb = readval.msb - 2; //Apparently you need to do -2 to get the right value
+    return readval; //Return the value
+}
+
+int main() {
+    temperature readval;
+    i2c.start();
+    i2c.write(DS1631WRITEADDRESS); //address
+    i2c.write(0xAC); //config reg
+    i2c.write(0x02); //config
+    i2c.stop();
+    
+    //Start conversion:
+    i2c.start();
+    i2c.write(DS1631WRITEADDRESS);
+    i2c.write(0x51); //start conversion
+    i2c.stop();
+    while(1) {
+        readval = readds1631(); //Call the readds1631 function
+        lcd.cls(); //Clear the LCD
+        lcd.printf("Temp: %d\nLSB:%d", readval.msb, readval.lsb);
+        wait(0.3); 
+    }
+}