If you are using arduino uno board with avr-gcc compiler. You can have a printf printing system for better debugging.
This I tried in debian system and used avr-gcc toolchain.
print.c
#include stdio.h
#include avr/io.h
#ifndef F_CPU
#define F_CPU 16000000UL
#endif
#ifndef BAUD
#define BAUD 38400
#endif
int uart_putch ( char ch, FILE *stream );
int uart_getch ( FILE *stream );
FILE uart_str = FDEV_SETUP_STREAM ( uart_putch, uart_getch, _FDEV_SETUP_RW );
void uart_init ( void )
{
UBRR0H = (((F_CPU/BAUD)/16)-1)>>8;
UBRR0L = (((F_CPU/BAUD)/16)-1);
UCSR0B = (1<<RXEN0)|(1<<TXEN0);
UCSR0C = (1<<UCSZ01)|(1<<UCSZ00);
}
void ansi_clear_screen ( void )
{
putchar(27);
putchar('[');
putchar('H');
putchar(27);
putchar('[');
putchar('J');
}
void ansi_me(void)
{
putchar(27);
putchar('[');
putchar('0');
putchar('m');
}
void uart_flush ( void )
{
unsigned char dummy;
while ( UCSR0A & (1<<RXC0) )
dummy = UDR0;
}
int uart_putch ( char ch, FILE *stream )
{
if ( ch == '\n' )
uart_putch ( '\r', stream );
while (!(UCSR0A & (1<<UDRE0)));
UDR0=ch;
return 0;
}
int uart_getch ( FILE *stream )
{
unsigned char ch = '\0';
while ( !(UCSR0A & (1<<RXC0)));
ch = UDR0;
return ch;
}
void init_print ( void )
{
stdout = stdin = &uart_str;
uart_init ();
ansi_me ();
ansi_clear_screen ();
ansi_me ();
ansi_clear_screen ();
uart_flush ();
}
compile it.
In the your .c file add ( for example consider demo.c as your c file )
#include stdio.h
extern void init_print ( void );
then add printf ("Example\n"); anywhere in the demo.c code.
A part of Makefile.
demo.o: $(SRC)/demo.c
avr-gcc -g -mmcu=atmega328p -c $(SRC)/demo.c -o demo.o
print.o: $(SRC)/print.c
avr-gcc -g -mmcu=atmega328p -c $(SRC)/print.c -o print.o
demo.elf: demo.o print.o
avr-gcc -g -mmcu=atmega328p -o demo.elf demo.o print.o
convert the demo.elf to hex and burn to arduino uno with avrdude.
Now open a minicom ( sudo minicom -s ). Install minicom if you don't have. apt-get install minicom.
Update serial port setup to 38400, 8N1 - save as dfl and exit.
You can see the printf messages in the minicom terminal.
