Stijn Sontrop / Mbed 2 deprecated DS1631LCD

An example program that shows how to read a Maxim DS1631 temperature sensor via the I2C bus and print the results to an LCD.

Dependencies:   TextLCD mbed

Files at this revision

API Documentation at this revision

Revision 0:f00aca3e58e1, committed 2010-12-22

Comitter:
StijnS
Date:
Wed Dec 22 19:53:51 2010 +0000
Commit message:

Changed in this revision

TextLCD.lib Show annotated file Show diff for this revision Revisions of this file
main.cpp Show annotated file Show diff for this revision Revisions of this file
mbed.bld Show annotated file Show diff for this revision Revisions of this file 
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TextLCD.lib	Wed Dec 22 19:53:51 2010 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/simon/code/TextLCD/#44f34c09bd37

--- /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); 
+    }
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Wed Dec 22 19:53:51 2010 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/e2ac27c8e93e