AVR-atmega16 BOOTLoader 程序

本程序參照馬潮mega128的編寫?？芍С?85或232接口。變異軟件ICCAVR，上位機軟件應用超級終端或avrubd等，Xmodem，9600,8,1，n

#include

#include

#include

#define SPM_PAGESIZE 128 //M16的一個Flash頁為128字節(jié)(64字),共128頁

#define BAUD 9600 //波特率采用9600bps

#define CRYSTAL 14745600 //系統(tǒng)時鐘 ?? M Hz

//計算和定義M16的波特率設(shè)置參數(shù)

#define BAUD_SETTING (unsigned char)((unsigned long)CRYSTAL/(16*(unsigned long)BAUD)-1)

#define BAUD_H (unsigned char)(BAUD_SETTING>>8)

#define BAUD_L (unsigned char)BAUD_SETTING

//定義Xmoden控制字符

#define XMODEM_NUL 0x00

#define XMODEM_SOH 0x01

#define XMODEM_STX 0x02

#define XMODEM_EOT 0x04

#define XMODEM_ACK 0x06

#define XMODEM_NAK 0x15

#define XMODEM_CAN 0x18

#define XMODEM_EOF 0x1A

#define XMODEM_RECIEVING_WAIT_CHAR 'C'

//定義接收緩沖區(qū)長度

#define DATA_BUFFER_SIZE SPM_PAGESIZE

//485使能

#define USART_TX_ENABLE(){asm("sbi 0x12,2"); asm("nop");}//485發(fā)送使能 D口 pin2

#define USART_RX_ENABLE(){asm("cbi 0x12,2"); asm("nop");}//485接收使能

//定義全局變量

const char startupString[]="nrType 'W' download, Others run application program.nr