📄 bootldr.c
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Project: AVR Common BootLoader
AVR 通用 Bootloader
File: bootldr.c
主程序
Version: 1.0
Compiler: GCC 4.1.1 + AVR Studio 4.13.528
Author: Shaoziyang
Shaoziyang@126.com
http://shaoziyang.bloger.com.cn
Date: 2007.3
Modify: Add your modify log here
See readme.txt to get more information.
*/
#include "bootcfg.h"
#include "bootldr.h"
//用户程序起始地址
#define PROG_START 0x0000
//接收缓冲区大小不能小于 SPM_PAGESIZE
#if BUFFERSIZE < SPM_PAGESIZE
#define BUFSIZE SPM_PAGESIZE
#else
#define BUFSIZE BUFFERSIZE
#endif
//接收缓冲区
unsigned char buf[BUFSIZE];
#if BUFSIZE > 255
unsigned int bufptr, pagptr;
#else
unsigned char bufptr, pagptr;
#endif
unsigned char ch, cl;
//Flash地址
#if FLASHEND > 0xFFFF
unsigned long FlashAddr;
#else
unsigned int FlashAddr;
#endif
//更新一个Flash页的完整处理
void write_one_page(unsigned char *buf)
{
boot_page_erase(FlashAddr); //擦除一个Flash页
boot_spm_busy_wait();
for(pagptr = 0; pagptr < SPM_PAGESIZE; pagptr += 2) //将数据填入Flash缓冲页中
{
boot_page_fill(pagptr, buf[pagptr] + (buf[pagptr + 1] << 8));
}
boot_page_write(FlashAddr); //将缓冲页数据写入一个Flash页
boot_spm_busy_wait(); //等待页编程完成
}
//跳转到用户程序
void quit()
{
boot_rww_enable();
(*((void(*)(void))PROG_START))();
}
//写入数据到串口
void WriteCom(unsigned char dat)
{
#if RS485
RS485Enable();
#endif
UDRREG(COMPORTNo) = dat;
//等待数据发送完成
while(!(UCSRAREG(COMPORTNo) & (1<<TXCBIT(COMPORTNo))));
UCSRAREG(COMPORTNo) |= (1 << TXCBIT(COMPORTNo));
#if RS485
RS485Disable();
#endif
}
//等待串口数据
unsigned char WaitCom()
{
while(!DataInCom());
return ReadCom();
}
#if VERBOSE
void putstr(const char *str)
{
while(*str)
WriteCom(*str++);
WriteCom(0x0D);
WriteCom(0x0A);
}
#endif
//计算CRC校验：1021
#if BUFSIZE > 255
void crc16(unsigned char *buf, unsigned int n)
{
unsigned int j;
#else
void crc16(unsigned char *buf, unsigned char n)
{
unsigned char j;
#endif
unsigned char i;
unsigned int crc, t;
crc = 0;
for(j = n; j > 0; j--)
{
#if CRCMODE == 0
crc = (crc ^ (((unsigned int) *buf) << 8));
for(i = 8; i > 0; i--)
{
t = crc << 1;
if(crc & 0x8000)
t = t ^ 0x1021;
crc = t;
}
#elif CRCMODE == 1
crc += (unsigned int)(*buf);
#elif
#endif
buf++;
}
ch = crc / 256;
cl = crc % 256;
}
int main(void)
{
unsigned char cnt;
unsigned char packNO;
unsigned char crch, crcl;
#if InitDelay > 255
unsigned int di;
#elif InitDelay
unsigned char di;
#endif
#if BUFFERSIZE > 255
unsigned int li;
#else
unsigned char li;
#endif
//关闭中断：异常情况下的保护
asm volatile("cli": : );
#if WDGEn
//允许看门狗
wdt_enable(WDTO_1S);
#endif
//时钟初始化:CTC模式
TimerInit();
#if RS485
DDRREG(RS485PORT) |= (1 << RS485TXEn);
RS485Disable();
#endif
#if LEDEn
//设置LED端口为输出状态
DDRREG(LEDPORT) = (1 << LEDPORTNo);
#endif
//串口初始化
ComInit();
#if InitDelay
//某些型号的单片机需要延时，否则串口发出的数据是乱码
for(di = InitDelay; di > 0; di--)
__asm__ __volatile__ ("nop");
#endif
#if LEVELMODE
//引脚电平启动Bootloader模式
DDRREG(LEVELPORT) |= (1 << LEVELPIN);
#if PINLEVEL
if(PINREG(LEVELPORT) & (1 << LEVELPIN))
#else
if(!(PINREG(LEVELPORT) & (1 << LEVELPIN)))
#endif
{
#if VERBOSE
//进入升级模式
putstr(msg6);
#endif
}
else
{
#if VERBOSE
//进入用户程序
putstr(msg7);
#endif
quit();
}
#else
//串口启动Bootloader模式
#if VERBOSE
//提示等待密码
putstr(msg1);
#endif
cnt = TimeOutCnt;
cl = 0;
while(1)
{
if(TIFRREG & (1<<OCF1A)) //T1溢出
{
TIFRREG |= (1 << OCF1A);
if(cl == CONNECTCNT)
break;
#if LEDEn
//LED指示状态
LEDAlt();
#endif
#if WDGEn
//清除看门狗
wdt_reset();
#endif
cnt--;
if(cnt == 0)
{
#if VERBOSE
//提示超时
putstr(msg2);
#endif
//跳转到用户程序
quit();
}
}
if(DataInCom())
{
if(ReadCom() == KEY[cl])
cl++;
else
cl = 0;
}
}
#endif
#if VERBOSE
//提示等待接收文件
putstr(msg3);
#endif
//每个时隙向PC机发送一个控制字符“C”，等待控制字〈soh〉
cnt = TimeOutCntC;
while(1) //receive the start of Xmodem
{
if(TIFRREG & (1<<OCF1A)) //T1溢出
{
TIFRREG |= (1 << OCF1A);
WriteCom(XMODEM_RWC) ; //发送 "C"
#if LEDEn
//LED指示状态
LEDAlt();
#endif
#if WDGEn
//清除看门狗
wdt_reset();
#endif
cnt--;
if(cnt == 0)
{
#if VERBOSE
//提示超时
putstr(msg2);
#endif
quit();
}
}
if(DataInCom())
{
if(ReadCom() == XMODEM_SOH)
break;
}
}
//关闭定时器
TCCR1B = 0;
//开始接受数据
packNO = 1;
bufptr = 0;
cnt = 0;
FlashAddr = 0;
do
{
ch = WaitCom(); //获取包序号
cl = ~WaitCom();
if ((packNO == ch) && (packNO == cl))
{
for(li = 0; li < BUFFERSIZE; li++) //接收完一帧数据
{
buf[bufptr++] = WaitCom();
}
crch = WaitCom();
crcl = WaitCom();
crc16(&buf[bufptr - BUFFERSIZE], BUFFERSIZE);//计算CRC校验
if((crch == ch) && (crcl == cl))
{
#if BUFFERSIZE <= SPM_PAGESIZE
if(bufptr >= SPM_PAGESIZE) //缓冲区满，写入数据；否则继续接收
{ //接收多个帧，写入缓冲区
write_one_page(buf); //写入缓冲区内容到Flash中
FlashAddr += SPM_PAGESIZE; //修改Flash页地址
bufptr = 0;
}
#else
while(bufptr > 0) //接收一帧，写入多个页面
{
write_one_page(&buf[BUFSIZE - bufptr]);
FlashAddr += SPM_PAGESIZE; //修改Flash页地址
bufptr -= SPM_PAGESIZE;
}
#endif
//正确收到一个数据块
WriteCom(XMODEM_ACK);
packNO++;
cnt = 0;
#if WDGEn
//清除看门狗
wdt_reset();
#endif
#if LEDEn
//LED指示状态
LEDAlt();
#endif
}
else
{
//要求重发数据块
WriteCom(XMODEM_NAK);
cnt++;
}
}
else
{
//要求重发数据块
WriteCom(XMODEM_NAK);
cnt++;
}
//连续错误次数太多，中止升级
if(cnt > 3)
break;
}
while(WaitCom() != XMODEM_EOT);
WriteCom(XMODEM_ACK);
#if VERBOSE
if(cnt == 0)
{
//提示升级成功
putstr(msg4);
}
else
{
//提示升级失败
putstr(msg5);
#if WDGEn
//等待看门狗复位
while(1);
#endif
}
#endif
quit();
return 0;
}
//End of file: bootldr.c
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