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main.c
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/*
AVR Software-Uart Demo-Application
Version 0.4, 10/2010
by Martin Thomas, Kaiserslautern, Germany
http://www.siwawi.arubi.uni-kl.de/avr_projects
*/
/*
Test environment/settings:
- avr-gcc 4.3.3/avr-libc 1.6.7 (WinAVR 3/2010)
- Atmel ATmega324P @ 8MHz internal RC, ATtiny85 @ 1MHz internal RC
- 2400bps
*/
/*
AVR Memory Usage (-Os, no-inline small-functions, relax)
----------------
Device: atmega324p
Program: 926 bytes (2.8% Full)
(.text + .data + .bootloader)
Data: 52 bytes (2.5% Full)
(.data + .bss + .noinit)
AVR Memory Usage (-Os)
----------------
Device: attiny85
Program: 828 bytes (10.1% Full)
(.text + .data + .bootloader)
Data: 52 bytes (10.2% Full)
(.data + .bss + .noinit)
*/
#define WITH_STDIO_DEMO 0 /* 1: enable, 0: disable */
#include <avr/interrupt.h>
#include <avr/pgmspace.h>
#include "softuart.h"
#if WITH_STDIO_DEMO
#include <stdio.h>
// interface between avr-libc stdio and software-UART
static int my_stdio_putchar( char c, FILE *stream )
{
if ( c == '\n' ) {
softuart_putchar( '\r' );
}
softuart_putchar( c );
return 0;
}
FILE suart_stream = FDEV_SETUP_STREAM( my_stdio_putchar, NULL, _FDEV_SETUP_WRITE );
static void stdio_demo_func( void )
{
stdout = &suart_stream;
printf( "This output done with printf\n" );
printf_P( PSTR("This output done with printf_P\n") );
}
#endif /* WITH_STDIO_DEMO */
int main(void)
{
char c;
static const char pstring[] PROGMEM =
"adapted for Atmel AVR and this demo by Martin Thomas\r\n";
unsigned short cnt = 0;
#if (F_CPU > 4000000UL)
#define CNTHALLO (unsigned int)(0xFFFF)
#else
#define CNTHALLO (unsigned int)(0xFFFF/3)
#endif
softuart_init();
softuart_turn_rx_on(); /* redundant - on by default */
sei();
softuart_puts_P( "\r\nSoftuart Demo-Application\r\n" ); // "implicit" PSTR
softuart_puts_p( PSTR("generic softuart driver code by Colin Gittins\r\n") ); // explicit PSTR
softuart_puts_p( pstring ); // pstring defined with PROGMEM
softuart_puts( "--\r\n" ); // string "from RAM"
#if WITH_STDIO_DEMO
stdio_demo_func();
#endif
for (;;) {
if ( softuart_kbhit() ) {
c = softuart_getchar();
softuart_putchar( '[' );
softuart_putchar( c );
softuart_putchar( ']' );
}
cnt++;
if (cnt == CNTHALLO) {
cnt = 0;
softuart_puts_P( " Hello " );
}
}
return 0; /* never reached */
}