Diff: MLX90614.cpp

Revision:

0:755bd47fd6be

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/MLX90614.cpp	Mon Sep 05 10:52:54 2016 +0000
@@ -0,0 +1,35 @@
+#include "MLX90614.h"
+
+MLX90614::MLX90614(PinName sda, PinName scl)
+{
+    i2c_ = new I2C(sda, scl);
+    i2c_->frequency(400000);
+}
+
+MLX90614::MLX90614(I2C *i2c) : i2c_(i2c) {
+    }
+
+MLX90614::~MLX90614() {
+    delete i2c_;
+    }
+
+float MLX90614::get_temp(uint8_t reg) {
+    char cmd[3] = { 0 };
+    // read the temperature data (kelvin)
+    cmd[0] = ram_access | reg;
+    i2c_->write(default_addr,cmd,1,true); i2c_->read(default_addr,cmd,3);
+    // convert to meaningful units, still in kelvin - just normalized
+    return 0.02 * static_cast<float>((cmd[1]<<8)|cmd[0]);
+}
+
+float MLX90614::read_temp(int select) {
+    uint8_t reg_addrs[] = { T_ambient, T_obj1 };
+    float tt = 0.0;
+    if (select == 0){
+        tt = get_temp(reg_addrs[0])-273.15;
+        }
+    if (select == 1){
+        tt = get_temp(reg_addrs[1])-273.15;
+        }
+    return tt;
+    }