Diff: main.cpp

Revision:

0:b65d2cdf2cc8

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Mar 25 15:20:27 2014 +0000
@@ -0,0 +1,47 @@
+#include "mbed.h"
+
+/***********************************************************************
+* Read temperature by using DS1631
+*
+* Normal I2C-protocol (start,write,..,stop) does NOT work
+* It has to be used 
+*   i2c.write(address,data,length,repeat) 
+* which includes start and stop and a special addressing function
+************************************************************************/
+DigitalOut myled(LED2);
+DigitalIn button(USER_BUTTON);
+I2C i2c (PB_9,PB_8);           // sda, scl
+
+int main() {
+    int data;
+    uint16_t cr1;
+    int ack;
+    char data_write[2];
+    char data_read[2];
+    //cr1 = I2C1->CR1;
+    //I2C1->CR2 = 0x0002;
+     
+    data_write[0] = 0xEE;
+    ack = i2c.write(0x90, data_write, 1, 0);       
+    data_write[0] = 0xAC;               // writes the 1-byte configuration register
+    data_write[1] = 0x0F;               // 1shot;12bit;pol=1
+    ack = i2c.write(0x90, data_write, 2, 0);       
+
+    while(1) {
+        while (button);                 // start measurement by user_button
+ 
+        data_write[0] = 0x51;           // Initiates temperature conversions
+        ack = i2c.write(0x90, data_write, 1, 0);       
+        //printf("%d\n",ack);
+        wait_ms(1000);
+         
+        data_write[0] = 0xAA;           // Reads last converted temperature value from the 2-byte temperature register
+        ack = i2c.write(0x90, data_write, 1, 1);     
+        i2c.read(0x90, data_read, 2, 0); 
+         
+        data=data_read[0]*100;
+        data=data+(((data_read[1] >> 4 )* 50)/8);
+        printf("%d\n",data);
+        //wait_ms(1000);               
+    }
+}