sci2c arduino updated

1 files changed, 40 insertions, 0 deletions

diff --git a/src/c/scilab-arduino/cmd_i2c_read_register/u8cmd_i2c_read_registers.cpp b/src/c/scilab-arduino/cmd_i2c_read_register/u8cmd_i2c_read_registers.cpp
new file mode 100644
index 0000000..fd07eb6
--- /dev/null
+++ b/src/c/scilab-arduino/cmd_i2c_read_register/u8cmd_i2c_read_registers.cpp
@@ -0,0 +1,40 @@
+/* Copyright (C) 2017 - IIT Bombay - FOSSEE
+
+ This file must be used under the terms of the CeCILL.
+ This source file is licensed as described in the file COPYING, which
+ you should have received as part of this distribution.  The terms
+ are also available at
+ http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt
+ Author: Yash Pratap Singh Tomar
+ Organization: FOSSEE, IIT Bombay
+ Email: toolbox@scilab.in
+*/
+
+
+//this function reads data from the device register with given address
+#include "cmd_i2c_read_register.h"
+#include "Arduino.h"
+#include "Wire.h"
+
+uint16 u8cmd_i2c_read_registers(uint8 address, uint8 reg_adrs)
+{
+  long int reading;
+
+  Wire.beginTransmission(address); // transmit to device address
+  Wire.write(reg_adrs);      // sets register pointer to reg_adrs position
+  Wire.endTransmission();      // stop transmitting
+
+  //  request reading from sensor
+  Wire.requestFrom(address, 2);    // request 2 bytes from slave device with address
+
+  // receive reading from sensor
+  if (2 <= Wire.available())  // if two bytes were received
+  {
+    reading = Wire.read();  // receive high byte (overwrites previous reading)
+    reading = reading << 8;    // shift high byte to be high 8 bits
+    reading |= Wire.read(); // receive low byte as lower 8 bits
+  }
+  
+    return(reading);
+
+}