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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;
}
}
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