1 files changed, 63 insertions, 0 deletions
diff --git a/2.3-1/src/c/hardware/avr/gpio/u8AVRDigitalIns.c b/2.3-1/src/c/hardware/avr/gpio/u8AVRDigitalIns.c
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+++ b/2.3-1/src/c/hardware/avr/gpio/u8AVRDigitalIns.c
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+// 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
+// Organization: FOSSEE, IIT Bombay
+// Email: toolbox@scilab.in
+
+// Function to get current state (high\low) of a digital pin on AVR
+//
+// Calling Sequence
+//     u8AVRDigitalIns(port,pin)
+//
+// Parameters
+//     port : port of microcontroller to be used (1 for PORTA, 2 for PORTB,...)
+//     pin : pin of port (mentioned above) to be used
+//   Returns->  
+//     state : state of the pin (0 for low and 1 for high)
+//
+// Description
+//     Each AVR microcontroller has pins which can be configured as digital
+//     outputs. These are normally divided among some 'ports' (group of pins).
+//     User has to select one of these port and which pin of that port is to 
+//     be read. Function returns current state of the pin '1' (high) or '0' (low).
+//          
+//
+// Examples
+//     state = u8AVRDigitalIns(1,0)
+//
+// Authors
+//     Siddhesh Wani
+//
+
+
+#include "AVRPeripheralGPIO.h"
+
+uint8 u8AVRDigitalIns(uint8 port,uint8 pin)
+{
+    unsigned int state = 0;
+    if(port == PORT_A)
+    {
+	state  = bit_is_clear(PINA,pin);
+        return !state;
+    }
+    if(port == PORT_B)
+    {
+        state  = bit_is_clear(PINB,pin);
+        return !state;
+    }
+    if(port == PORT_C)
+    {
+        state  = bit_is_clear(PINC,pin);
+	return !state;    
+    }
+    if(port == PORT_D)
+    {
+        state  = bit_is_clear(PIND,pin);
+	return !state;
+    }
+
+}