请问如何将程序拷贝到RAM中运行？

[mikijt]

最近在写bootloadr ，程序能够通过上位机将APP下发到mcu中，但是在APP执行命令擦除FLASH时出现了死机；

单独调试APP程序的时候，执行擦除命令，PC跳转到0x00001 ;

我就在考虑是不是我的flash相关的程序有没有拷贝到RAM 中，之前的做法是就是在对应的函数前面加上:#pragma CODE_SEG DEFAULT_RAM

1.copydown sction是否实现了从flash到ram的拷贝？是否是在doCopyDown就已经实现了这个拷贝过程？

尝试过将函数前面加上#pragma CODE_SEG DEFAULT_RAM，能够发现法该函数的地址是在RAM中。带上我不太确定！

2.是否需要手动memcpy才能实现代码的拷贝？

参考某BootLoader例程中的关于代码拷贝的代码：

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

#define __SEG_START_REF(a) __SEG_START_ ## a
#define __SEG_END_REF(a) __SEG_END_ ## a
#define __SEG_SIZE_REF(a) __SEG_SIZE_ ## a
#define __SEG_START_DEF(a) extern char __SEG_START_REF(a) []
#define __SEG_END_DEF(a) extern char __SEG_END_REF( a) []
#define __SEG_SIZE_DEF(a) extern char __SEG_SIZE_REF( a) []

__SEG_START_DEF(SHADOW_ROM);
__SEG_END_DEF(SHADOW_ROM);
__SEG_SIZE_DEF(SHADOW_ROM);

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

static void CopyCodeToRAM(void)
{
/* Variable Declarations */
uchar *Src;
uchar *Dst;
uint SegSize;
uint x;
/* Begin Function CopyCodeToRAM() */
Src = (uchar *)__SEG_START_REF(SHADOW_ROM); /* RAM code resides in Flash from 0xf000 - 0xf1ff */
Dst = (uchar *)0x001000; /* copied to the upper 512 bytes of RAM */
SegSize = (uint)__SEG_SIZE_REF(SHADOW_ROM);
for (x = 0; x < SegSize; x++) /* just copy a byte at a time */
*Dst++ = *Src++;
}

但是在执行的时候发现，执行该局之后，对应的RAM并没有与源flash地址的内容相同，就是说拷贝过程失败。

请问那种方法是对的？或者别的方法？

3、如何确定程序已经被拷贝到RAM中？

[dianabatrlova]

Hello, 

For better understanding, please, write your question in English. 

The flash commands should be executed from RAM because we cannot execute code in flash block during erase/program flash command. 

#pragma CODE_SEG DEFAULT_RAM

//Your function should be placed between the pragmas for placing the function in to RAM

#pragma CODE_SEG DEFAULT

Please be aware that the same #pragmas must be used also for function prototype.

The function will be automatically copied from Flash to the RAM during Startup() 

I would like to recommend you to look at an attached example code where you can see how to erase and program flash.

I assume this is the easiest way for executing the function from RAM. 

I hope it helps.

Thank you.

Best Regards,

Diana

[mikijt]

thank you very much!

As the function(pflash_send_command) is in the RAM section (0x10000 )in the map file, that means the func wound be  copyed into ram in startup ()!

[dianabatrlova]

Hello,

If you look into the code the PFLASH_Send_Command function is called in the PFLASH_Erase_Verify_Section function. It is not needed to place the whole PFLASH_Erase_Verify_Section function into RAM, Only a critical section (launch command) is placed into RAM when CCIF = 0. 

I hope it helps.

Best Regards,

Diana