main._c

AVR系列被广泛应用的单片机MEGA8开发(原理图)及例程

/*****************************************************************************
*
* Copyright (C) 1996-1998 Atmel Corporation
*
* File          : main.c
* Compiler      : IAR 1.51B
* Output size   : 505 bytes (size optimized)
* Created       : 16-jun-99
* Modified      : 5-jan-2000
* Last modified : 16-may-2001 by jll
*
* Support mail  : [e-mail]
*
* Description   : This Program allows an AVR with bootloader capabilities to 
*                 Read/write its own Flash/EEprom. To enter Programming mode   
*                 PD2 is checked, it this pin is pulled low, programming mode  
*                 is entered. If not, normal execution is done from $0000 
*                 "reset" vector in Application area.
*                 The PD2 pin should be pulled HIGH by an external Pull-up 
*                 resistor.
*
* Other info    : Code must be modified to use this specific code with devices
*                 other than ATmega161. Following change should be made:
*                    -Specify device in define list (e.g. _ATMEGA163)
*                 
*                 When using this code with (future) parts other than ATmega32,
*                 ATmega161 and ATmega163, it will be necessary to change more 
*                 than the device name. The changes that should be made is:
*                    -Device name
*                    -Device signature and memory settings (defines.h)
*                    -Device code
*                    -Linker file
*
*                 In general the linker file should always be verifyed to match
*                 the used part's boot address and size. Note that memory size
*                 is specified in bytes in the linker file.
****************************************************************************/
#include "defines.h"
#include "serial.h"
#include "assembly.h"

void Delay(unsigned int i)
{
while(i--) ;
}

void Display_IAP(void)
{
 PORTD = 0xEF;
 PORTB = 0x06;
}

void main(void)
{
unsigned int intval,address,data,page_address;
unsigned char val, page_size;
Delay(10000);
SerialInit();
Delay(50000);
 timer0_init();

 PORTB = 0xFF;
 DDRB  = 0xFF;
 PORTC = 0x7F; //m103 output only
 DDRC  = 0x79;
 PORTD = 0xFF;
 DDRD  = 0xFC;

 sendstr("富友勤 ATMEGA8 DEMO");
 sendstr("Start IAP");
      for(;;)                           
      {
      Display_IAP();
        val=recchar();
        if(val=='W')                   //Chip erase 
        {
          sendstr("Start Write ");
          page_address=recchar();
          page_address|=recchar()<<8;
          for(address=0;address < APP_END;address += PAGESIZE)  //Application section = 60 pages
          { 
          for(page_size=0;page_size < PAGESIZE;page_size += 2)  //Application section = 60 pages
          	{
          	if(page_address!=0)
          	 data=recchar();
                else
                data=0xFF;
                if(page_address)
                page_address--;
                if(page_address!=0)
               data|=recchar()<<8;
                else
               data|=0xFF<<8;
                if(page_address)
                page_address--;
               fill_temp_buffer(data,(page_size)); //call asm routine. 
          	}
            write_page((address),0x05);       
          	}
           sendstr("End Write ");  
        }
        
       else if(val=='e')                   //Chip erase 
        {   
        sendstr("Start Erase ");  

          for(address=0;address < APP_END;address += PAGESIZE)  //Application section = 60 pages
          {Delay(20000);
            write_page(address,0x03);       //Perform page erase
          }
            sendstr("End  Erase ");  
        }

      }
    }