除了上拉DP方法外，有沒有軟件的方法讓已經(jīng)有代碼的返回到bootloader代碼下載狀態(tài)？

根據(jù)手冊，擦除3800h地址的4個字節(jié)代碼后reset復位可行嗎？還是說需要修改NO_BOOT_LOAD標記位后reset？

if you want to activate the bootloader from user mode just exexute a LCALL 0x3800 or LJMP 0x3800.?

It might be a good idea to disable all irqs before and maybe set the clock to the default 6MHz although i also have started the bootloader at 24Mhz.

Example (keil)

#define CALL(addr) (((void(*)(void))(unsigned char code *)addr)())

...

if(bWantBootLoader)

{

? ? EA=0;

? ? CALL(0x3800);

? ? while(1);

}

....

thanks bro,i'll gonna try your code!