AVRFreaks.net

#include "xmodem.h"

extern struct global
{
  volatile unsigned char *recv_ptr;
  volatile unsigned char buffer_status;
  volatile unsigned char recv_error;
  volatile unsigned char t1_timed_out;
} gl;



unsigned char flush;

void purge(void)
{
    gl.t1_timed_out = FALSE;

   
    TCNT0 = 0xF1;   //dummy value to not wait long
    TCCR0 = 0x02;    // prescaler /8
   
    while (gl.t1_timed_out != TRUE)   // read uart until done
    {
        flush = UDR;
    }
    TCCR0 = 0x00;   // disable timer/counter 1 clock
   
   PORTC |= (1 << DDC2); //just to see what is going on
}

ISR (TIMER0_OVF_vect)
{
    gl.t1_timed_out = TRUE;
   PORTC |= (1 << DDC7); //to see what is going on
   
}

#include <stdint.h>
#include <avr/io.h>
#include <avr/boot.h>
#include <avr/pgmspace.h>
#include <avr/interrupt.h>
#include <avr/eeprom.h>
#include <util/delay.h>
#include <avr/wdt.h>


#define SOH 01
#define EOT 04
#define ACK 06
#define NAK 21
#define Konst 'C'

#define WAIT_VALUE 5000

#define TRUE 0x01
#define FALSE 0x0

#define full 0xff
#define empty 0x00

#define bad 0x00
#define good 0x01
#define dup 0x02
#define end 0x03
#define err 0x04
#define out 0x05

#define DEBUG_PIN     PORTD_Bit5 // spare pin used for debug signalling only
// Usage:
// DEBUG_PIN=0;
// DEBUG_PIN=1;

uint16_t addr;

// function prototypes
void receive(volatile unsigned char *bufptr1);
void purge(void);
void init(void);
unsigned char validate_packet(unsigned char *bufptr, unsigned char *packet_number);

uint16_t writeFlashPage(uint16_t, volatile unsigned char *);

void suolis(void);

void respond(unsigned char packet);
void recv_wait(void);
void sendc(void);
int calcrc(unsigned char *ptr, int count);

PORTC |= (1 << DDC2); //just to see what is going on

volatile *recv_ptr