Diff: my_mlx.cpp

Revision:

0:b8c679416b97

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/my_mlx.cpp	Thu Aug 01 11:41:20 2019 +0000
@@ -0,0 +1,83 @@
+/*************************************************** 
+  This is a library for the MLX90614 Temp Sensor
+  Designed specifically to work with the MLX90614 sensors in the
+  adafruit shop
+  ----> https://www.adafruit.com/products/1748
+  ----> https://www.adafruit.com/products/1749
+  These sensors use I2C to communicate, 2 pins are required to  
+  interface
+  Adafruit invests time and resources providing this open source code, 
+  please support Adafruit and open-source hardware by purchasing 
+  products from Adafruit!
+  Written by Limor Fried/Ladyada for Adafruit Industries.  
+  BSD license, all text above must be included in any redistribution
+ ****************************************************/
+
+#include "my_mlx.h"
+
+//Adafruit_MLX90614::Adafruit_MLX90614(uint8_t i2caddr) {
+//  _addr = i2caddr;
+//}
+
+Adafruit_MLX90614::Adafruit_MLX90614(PinName sda, PinName scl)
+{
+    i2c_ = new I2C(sda, scl);
+    i2c_->frequency(400000);
+}
+
+Adafruit_MLX90614::Adafruit_MLX90614(I2C *i2c) : i2c_(i2c) {
+    }
+
+Adafruit_MLX90614::~Adafruit_MLX90614() {
+    delete i2c_;
+    }
+
+//////////////////////////////////////////////////////
+
+
+double Adafruit_MLX90614::readObjectTempF(void) {
+  return (readTemp(MLX90614_TOBJ1) * 9 / 5) + 32;
+}
+
+
+double Adafruit_MLX90614::readAmbientTempF(void) {
+  return (readTemp(MLX90614_TA) * 9 / 5) + 32;
+}
+
+double Adafruit_MLX90614::readObjectTempC(void) {
+  return readTemp(MLX90614_TOBJ1);
+}
+
+
+double Adafruit_MLX90614::readAmbientTempC(void) {
+  return readTemp(MLX90614_TA);
+}
+
+float Adafruit_MLX90614::readTemp(uint8_t reg) {
+  float temp;
+  
+  temp = read16(reg);
+  temp *= .02;
+  temp  -= 273.15;
+  return temp;
+}
+
+/*********************************************************************/
+
+uint16_t Adafruit_MLX90614::read16(uint8_t a) {
+  uint16_t ret;
+  char cmd[3] = { 0 };
+
+  //Wire.beginTransmission(_addr); // start transmission to device
+  i2c_->write(_addr,cmd,1,true); 
+  //Wire.write(a); // sends register address to read from
+  //Wire.endTransmission(false); // end transmission
+  
+ // Wire.requestFrom(_addr, (uint8_t)3);// send data n-bytes read
+  ret = i2c_->read(_addr,cmd,3); // receive DATA
+  ret |= i2c_->read(_addr,cmd,3) << 8; // receive DATA
+
+  uint8_t pec = i2c_->read(_addr,cmd,3);
+
+  return ret;
+}
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