Stijn Sontrop
An example program that shows how to read a Maxim DS1631 temperature sensor via the I2C bus and print the results to an LCD.
Revision 0:f00aca3e58e1, committed 2010-12-22
- Comitter:
- StijnS
- Date:
- Wed Dec 22 19:53:51 2010 +0000
- Commit message:
Changed in this revision
diff -r 000000000000 -r f00aca3e58e1 TextLCD.lib --- /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
diff -r 000000000000 -r f00aca3e58e1 main.cpp
--- /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);
+ }
+}
diff -r 000000000000 -r f00aca3e58e1 mbed.bld --- /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