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ATMEGA_SERIAL_USB/ATMEGA_SERIAL_USB.ino

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+ /*
+Title:		SerialCom.c 
+Date Created:   6/9/2009
+Last Modified:  6/9/2009
+Target:		Atmel ATmega168
+Environment:	AVR-GCC 
+  
+  Note: the makefile is expecting a '168 with a 16 MHz crystal.
+  
+Adapted from the Arduino sketch "Serial Call and Response," by Tom Igoe.
+   
+  //  This program sends an ASCII A (byte of value 65) on startup
+  //  and repeats that until it gets some data in.
+  //  Then it waits for a byte in the serial port, and 
+  //  sends three (faked) sensor values whenever it gets a byte in.
+   
+   
+   
+Written by Windell Oskay, http://www.evilmadscientist.com/
+
+Copyright 2009 Windell H. Oskay
+Distributed under the terms of the GNU General Public License, please see below.
+
+Additional license terms may be available; please contact us for more information.
+
+
+
+More information about this project is at 
+http://www.evilmadscientist.com/article.php/peggy
+
+
+
+-------------------------------------------------
+USAGE: How to compile and install
+
+
+
+A makefile is provided to compile and install this program using AVR-GCC and avrdude.
+
+To use it, follow these steps:
+1. Update the header of the makefile as needed to reflect the type of AVR programmer that you use.
+2. Open a terminal window and move into the directory with this file and the makefile.  
+3. At the terminal enter
+		make clean   <return>
+		make all     <return>
+		make program <return>
+4. Make sure that avrdude does not report any errors.  If all goes well, the last few lines output by avrdude
+should look something like this:
+
+avrdude: verifying ...
+avrdude: XXXX bytes of flash verified
+
+avrdude: safemode: lfuse reads as E2
+avrdude: safemode: hfuse reads as D9
+avrdude: safemode: efuse reads as FF
+avrdude: safemode: Fuses OK
+
+avrdude done.  Thank you.
+
+
+If you a different programming environment, make sure that you copy over 
+the fuse settings from the makefile.
+
+
+-------------------------------------------------
+
+This code should be relatively straightforward, so not much documentation is provided.  If you'd like to ask 
+questions, suggest improvements, or report success, please use the evilmadscientist forum:
+http://www.evilmadscientist.com/forum/
+
+-------------------------------------------------
+ 
+
+ 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 St, Fifth Floor, Boston, MA  02110-1301  USA
+
+
+*/ 
+#include <avr/io.h> 
+#define F_CPU 16000000	// 16 MHz oscillator.
+#define BaudRate 9600
+#define MYUBRR (F_CPU / 16 / BaudRate ) - 1 
+
+void delayLong() {
+	unsigned int delayvar;
+	delayvar = 0; 
+	while (delayvar <=  65500U) { 
+		asm("nop");  
+		delayvar++;
+	} 
+}
+
+
+unsigned char serialCheckRxComplete(void)
+{
+	return( UCSR0A & _BV(RXC0)) ;		// nonzero if serial data is available to read.
+}
+
+unsigned char serialCheckTxReady(void)
+{
+	return( UCSR0A & _BV(UDRE0) ) ;		// nonzero if transmit register is ready to receive new data.
+}
+
+unsigned char serialRead(void)
+{
+	while (serialCheckRxComplete() == 0)		// While data is NOT available to read
+	{;;} 
+	return UDR0;
+}
+
+void serialWrite(unsigned char DataOut)
+{
+	while (serialCheckTxReady() == 0)		// while NOT ready to transmit 
+	{;;} 
+	UDR0 = DataOut;
+}
+
+
+
+void establishContact() {
+	while (serialCheckRxComplete() == 0) { 
+		serialWrite('A');
+	//	serialWrite(65U);
+		delayLong();
+		delayLong();
+		delayLong();
+		delayLong();
+		delayLong();
+		delayLong();
+		delayLong();
+	}
+}
+
+  
+
+int main (void)
+{ 
+	
+//Interrupts are not needed in this program. You can optionally disable interrupts.	
+//asm("cli");		// DISABLE global interrupts.
+
+		
+	DDRD = _BV(1);
+	DDRB = _BV(0) | _BV(1) | _BV(3) | _BV(5);
+	 
+	//Serial Initialization
+	
+ 	/*Set baud rate */ 
+	UBRR0H = (unsigned char)(MYUBRR>>8); 
+	UBRR0L = (unsigned char) MYUBRR; 
+	/* Enable receiver and transmitter   */
+	UCSR0B = (1<<RXEN0)|(1<<TXEN0); 
+	/* Frame format: 8data, No parity, 1stop bit */ 
+	UCSR0C = (3<<UCSZ00);  
+	
+	 
+	int firstSensor = 0;    // first analog sensor
+	int secondSensor = 0;   // second analog sensor
+	int thirdSensor = 0;    // digital sensor
+	int inByte = 0;         // incoming serial byte
+	
+	
+	PORTB |= _BV(1); // Turn on LED @ PB1
+	
+
+establishContact();  // send a byte to establish contact until Processing responds 
+
+		PORTB &= 253U; // Turn off LED
+	
+
+for (;;)  // main loop										
+{
+
+	
+	if (serialCheckRxComplete()) {
+		PORTB |= _BV(1); // Turn on LED @ PB1
+		
+		inByte = serialRead();
+		
+		// Simulated data!
+		firstSensor++;
+		
+		secondSensor = firstSensor * firstSensor;
+		
+		thirdSensor = firstSensor + secondSensor;
+		
+		serialWrite(firstSensor & 255U);
+		serialWrite(secondSensor & 255U);
+		serialWrite(thirdSensor & 255U);
+
+		PORTB &= 253U; // Turn off LED
+              
+	}	
+
+  }	//End main loop.
+	return 0;
+}