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NoiseRaw.c

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+
+/*
+------------------------------------------------------------------------
+File    : NoiseRaw.c
+Project : Gentrop
+Version : 1.0.0
+Author  : GioDim
+Comment : Arduino sketch
+History :
+24.02.2018 - Release 1.0.0
+------------------------------------------------------------------------
+Copyleft 2018 GioDim <giodim@autistici.org>
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+	
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+MA 02110-1301, USA.
+------------------------------------------------------------------------
+*/
+
+/*
+------------------------------------------------------------------------
+Define
+------------------------------------------------------------------------
+*/
+
+# define	NOISE_PIN		7
+# define	BUF_LEN			256
+# define	DELAY			2
+# define	BAUD_RATE		115200
+# define	NUM_BITS		8
+
+# define	FIRST_BIT		0
+# define	SECOND_BIT		1
+
+/*
+------------------------------------------------------------------------
+Global
+------------------------------------------------------------------------
+*/
+
+int
+	Status  = FIRST_BIT,
+	Noise   = 0,
+	Noise_A = 0,
+	Noise_B = 0,
+	Bits    = 0,
+	Line    = 0;
+
+uint8_t 
+	Result = 0,
+	Buf [BUF_LEN];
+ 
+/*
+------------------------------------------------------------------------
+Function : setup
+Input    :
+Output   :
+Comment  :
+------------------------------------------------------------------------
+*/
+
+void setup ()
+{
+
+	pinMode (NOISE_PIN, INPUT);
+
+	Serial.begin (BAUD_RATE);
+
+	for (int  i = 0; i < BUF_LEN; i++)
+		Buf [i] = 0;
+
+}
+
+/*
+------------------------------------------------------------------------
+Function : loop
+Input    :
+Output   :
+Comment  :
+------------------------------------------------------------------------
+*/
+
+void loop ()
+{
+
+	uint8_t
+		pause = 0;
+	int
+		i = 0,
+		j = 0;
+
+	// Read noise bit
+
+	Noise = digitalRead (NOISE_PIN);
+
+	if (Status == FIRST_BIT)
+	{
+
+		// First bit
+
+		Noise_A = Noise;
+		Status  = SECOND_BIT;
+
+	}
+	else
+	{
+
+		// Second bit
+
+		Noise_B = Noise;
+		Status  = FIRST_BIT;
+
+		// Skip if bits are equal
+
+		if (Noise_A != Noise_B)
+		{
+
+			// Store bit in byte
+
+			Result <<= 1;
+			Result  |= Noise_A;
+
+			if (++Bits == NUM_BITS)
+			{
+
+				// Store byte in buffer
+
+				Buf [Line++] = Result;
+
+				if (Line == BUF_LEN)
+				{
+
+					// Send buffer
+
+					Serial.write (Buf, BUF_LEN);
+					Line = 0;
+
+				}
+
+				Result = 0;
+				Bits   = 0;
+
+			}
+
+		}
+
+	}
+
+	// Delay loops
+
+	for (i = 0; i < DELAY; i++)
+		for (j = 0; j < DELAY; j++)
+			pause++;
+
+}