Diff: TMP102.cpp

Revision:

0:fea9b4d9a373

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TMP102.cpp	Wed Feb 10 16:10:42 2016 +0000
@@ -0,0 +1,82 @@
+#include "TMP102"
+
+TMP102::TMP102(PinName sda, PinName scl)
+{
+    is2_ = new I2C(sda,scl);
+    led_ = new DigitalOut(LED_RED);
+}
+
+ void TMP102::init() {
+    
+    i2c_->frequency(400000);
+    int ack;
+    char config_data[2];
+    char reg CONFIG_REG;
+    
+    ack = i2c_->write(TMP102_W_ADD,&reg,1);
+    
+    if (ack)
+        
+        error();
+        
+        i2c_->read(TMP102_R_ADD,&config_data,1);
+    
+    if (ack)
+        
+        error();
+      
+    //set conversion rate to 1 Hz  
+    config_data[1] |= (1<<6); //set bit 6
+    config_data[1] &= ~(1<<7); //clear bit 7
+    
+    char data_packet[3] = {reg, config_data[0], config_data[1]};
+    
+    ack = i2c_->write(TMP102_W_ADD,data_packet,3);
+    
+    if (ack)
+        error();
+        
+}
+
+void TMP102::read_temperature() {
+    
+    int ack;
+    char data[2];
+    char reg TEMP_REG;
+    
+    ack = i2c_->write (TMP102_W_ADD,&reg,1);
+    
+    if (ack) 
+        error();
+    
+    ack = i2c_->read(TMP102_R_ADD,data,2);
+    
+    if (ack)
+        error(); //if we don't receive acknowledgment, flash error message
+        
+    int temperature = (data[0] << 4) | (data[1] >> 4);
+    
+    temperature_ = temperature*0.0625F;
+    
+}
+
+float TMP102::get_temperature() {
+        
+        read_temperature();
+        return temperature_;
+}
+
+void TMP102::error() {
+        
+        while (1) {
+            
+            led_-> write(0);
+            wait(0.2);
+            led_> write(1);
+            wait(0.2);
+        }
+}
+        
+    
+    
+    
\ No newline at end of file