// Skeleton for a simple command interpreter using RS232 I/O
// Baby Orangutan @ 20 MHz
// S. James Remington, based on "stdiodemo.c" from WinAVR distribution examples
// sjames_remington at yahoo dot com

/* CPU frequency */
#define F_CPU 20000000UL

/* UART baud rate */
#define UART_BAUD  9600

#include <ctype.h>
#include <stdint.h>
#include <stdio.h>

#include <avr/io.h>
#include <avr/pgmspace.h>

#include <util/delay.h>

#include "uart.c"

FILE uart_str = FDEV_SETUP_STREAM(uart_putchar, uart_getchar, _FDEV_SETUP_RW);

int main(void)
{
  char buf[20];
  int n;

	uart_init();
	stdout = stdin = &uart_str;
	printf("\nHello world!\n");

// loop interprets commands of the form C nnn where "C" is a one-letter command, "nnn" is an integer
// only "f" and "q" (upper or lower case) are recognized in this skeleton version

  for (;;)
    {
      printf_P(PSTR("Enter command (c nnn): "));

		if (fgets(buf, sizeof buf - 1, stdin) == NULL) break;
		if (tolower(buf[0]) == 'q') break;

      switch (tolower(buf[0]))
		{
		default:
		printf("Unknown command: %s\n", buf);
		break;

		case 'f':
		if (sscanf(buf, "%*s %u", &n) > 0)	    {
	      printf("input: %c %u\n", buf[0], n);
			}
			else
			{
	      puts("valid argument not found\n");
			}
		break;
		}
    }
	printf("\nAll done...");
	return 0;
}