avr bootloader 源码-电子工程世界

assembly.s

  .text

SPMCR = 0x57   ;RWW区忙标志，读RWW区允许，允许写程序存储区

; void write_page (unsigned int adr, unsigned char function);
; bits 8:15 adr addresses the page...(must setup RAMPZ beforehand!!!)
_write_page::
    XCALL __WAIT_SPMEN__
    movw    r30, r16        ;move address to z pointer (R31 = ZH, R30 = ZL)
    STS     SPMCR, R18      ;argument 2 decides function
    SPM                     ;perform pagewrite
    RET

;-----------------------------------------

; void fill_temp_buffer (unsigned int data, unsigned int adr);
; bits 7:1 in adr addresses the word in the page... (2=first word, 4=second word etc..)
_fill_temp_buffer::
    XCALL __WAIT_SPMEN__
    movw    r30, r18        ;move adress to z pointer (R31=ZH R30=ZL)
    movw    r0, r16         ;move data to reg 0 and 1
    LDI     R19, 0x01
    STS     SPMCR, R19
    SPM                     ;Store program memory
    RET

;-----------------------------------------

;unsigned char read_flash(unsigned int add);
_read_flash::
    mov r31,r17
    mov r30,r16
    lpm r16,z
    clr r17
    ret

;unsigned int read_program_memory (unsigned int adr ,unsigned char cmd);
_read_program_memory::
    movw    r30, r16        ;move adress to z pointer
    SBRC    R18, 0          ;read lockbits? (second argument = 0x09)
    STS     SPMCR, R18      ;if so, place second argument in SPMEN register
    LPM     r16, Z+
    LPM     r17, Z
    RET

;-----------------------------------------

_enableRWW::
XCALL __WAIT_SPMEN__
    LDI R27,0x11
    STS SPMCR,R27
    SPM
    RET

;-----------------------------------------

__WAIT_SPMEN__:
    LDS     R27,SPMCR       ; load SPMCR to R27
    SBRC    R27,0           ; check SPMEN flag
    RJMP    __WAIT_SPMEN__ ; wait for SPMEN flag cleared
    RET

;-----------------------------------------

assembly.h

void write_page (unsigned int adr, unsigned char function);
void fill_temp_buffer (unsigned int data,unsigned int adr);
unsigned int read_program_memory (unsigned int adr,unsigned char cmd);
//void write_lock_bits (unsigned char val);
void enableRWW(void);
unsigned char read_flash(unsigned int add);

main.c

/******************************************************************************
Atmega16 BootLoad程序
日期：2004年的最后一天

/*****************************************************************************/
#include
#include
#include "assembly.h"//包含汇编代码头文件

//×××××××××××××××××××××××××××××××××××××××××××××××××××××××××
//请根据目标板选择芯片型号
//#define ChipType     Atmega8
#define ChipType     Atmega16
//#define ChipType     Atmega32
//#define ChipType     Atmega64
//#define ChipType     Atmega128
//#define ChipType     Atmega8535
//*********************************************************
//选择BOOT区大小
//#define BootSize     'a'    //128
//#define BootSize     'b'    //256
//#define BootSize       'c'    //512
//#define BootSize     'd'    //1024
//#define BootSize     'e'    //2048（不知道是否有2048字BOOT空间的芯片）
//选择BootLoad版本号
//#define BootVer        'f'    //1.0版本
//#define BootVer      'g'    //1.1版本
//#define BootVer      'h'    //1.2版本
//#define BootVer      'i'    //1.3版本
//#define BootVer      'j'    //1.4版本
//#define BootVer      'k'    //1.5版本
//#define BootVer      'l'    //1.6版本
//#define BootVer      'm'    //1.7版本
//#define BootVer      'n'    //1.8版本
//#define BootVer      'o'    //1.9版本
//#define BootVer      'p'    //2.0版本(应该是最终版本了）
//**********************************************************

#define Atmega16 0x31

//*****************************************************************************
//#define InteClk                 //是否使用内部时钟
//#define OscAddress     0x1fff   //时钟校准值存储地址
//#define OscAddress     0x3fff   //时钟校准值存储地址
//*****************************************************************************
//8时钟下的波特率设置
//#define BAU 103    //4800
//#define BAU 51       //9600
//#define BAU 34     //14400
//#define BAU 25     //19200

//16M时钟下的波特率设置
#define BAU 103 //9600

//使用的EEPROM
#define EEPROM_UPDATE_0X00_0X06 7
#define EEPROM_REPEAT_ENTER_BOOT_TIMES 0x07
#define EEPROM_DEBUG0 0x08
#define EEPROM_DEBUG1 0x09
#define ERASE_FLASH_PAGE_NUM 112//擦除页数

const unsigned char ucEepromWriteSuccess[EEPROM_UPDATE_0X00_0X06]={"success"};
const unsigned char ucEepromWriteUpdates[EEPROM_UPDATE_0X00_0X06]={"updates"};

//*****************************************************************************

#if (ChipType == Atmega16)
#include "iom16v.h"
#define PageByte 128
#define AddressShift 7
#endif

void FlashLoad(void);
unsigned char GetPageNumber(void);
void ExecCode(void);
char GetOnePageData(void);
unsigned char WriteFlash(void);
char CheckFlash(void);
void SendChar(unsigned char c);
void delay(void); //1ms延时函数
//unsigned char RecChar(void);
static unsigned int GetCRC16Code(unsigned char* pCalcBuf, unsigned char ucSize);

//unsigned char PageBuffer[PageByte+2];
unsigned int PageAddress=0;

#define BUFLEN 200
char uRxData;
char ucRecvBuf[BUFLEN];
unsigned int uiBufLen=0;
unsigned int uiStartBufDateLen=0;

//读EEPROM函数
static void EEPROM_Write(unsigned int Add,unsigned char Data)
{
if(Add<512) //如果地址大于512，无效
{
  while(EECR&BIT(EEWE)); //查询上一次EEPROM写操作是否完成
  EEAR=Add;    //写入地址
  EEDR=Data;    //写入数据
  EECR|=BIT(EEMWE);  //EEPROM写主机使能：准备
  EECR|=BIT(EEWE);  //EEPROM写使能：写入
}
}

//读EEPROM函数
static unsigned char EEPROM_Read(unsigned int Add)
{
unsigned char Temp=0;
if(Add<512) //如果地址大于512，读取0值
{
  while(EECR&BIT(EEWE)); //查询上一次EEPROM写操作是否完成
  EEAR=Add;    //写入地址
  EECR|=BIT(EERE);  //EEPROM读使能：读出
  Temp=EEDR;    //读取数据
}
return Temp;    //返回数据
}

#if 0
void PrintfStringToArm(char * str)
{
int i=0;
for(i=0;i {
SendChar(*(str+i));
}
}
#endif

/*****************************************************************************/
//Flash编程
/*****************************************************************************/
void FlashLoad(void)
{
unsigned int i;

unsigned char ucPageDateSuccessFlag=0;
SendChar('!');
while (1)
{
  if(!GetPageNumber())//获取页地址
  {
   return;
  }
  else
  {
   if (PageAddress == 0xff80)//写结束
   {
    SendChar('$');
    CLI();

    for(i=0;i    {
     EEPROM_Write(i,ucEepromWriteSuccess[i]);
    }
    SEI();