e2zone 发表于 2013-6-16 14:24 ![]()
我觉得他们说的那个库不是固件库。
因为那篇**中说，启动文件中的__main不是指c文件中的main函数。而是 ...
对于STM32来说，从__main到main的过程对于iar和rvct（mdk所用的编译器）来说都是封装在.a库文件里面的，只有gcc是“裸”的，代码如下。
bss段就是rvct的ZI段，text就是RW段位于flash部分，data段就是RW位于ram的部分。
int fu_ck_mojinming; //这就是ZI段数据
int fu_ck_mojinming=1; //这就是RW段数据，fu_ck_mojinming的初值位于flash的text段，上电后要搬到ram的data段才能执行，撸主明白了么？
/***************************************************************************/
/* ResetHandler */
/* */
/* This function is used for the C runtime initialisation, */
/* for handling the .data and .bss segments. */
/***************************************************************************/
void ResetHandler (void)
{
uint32_t *pSrc;
uint32_t *pDest;
/*
* Call the SystemInit code from CMSIS interface if available.
* SystemInit is a week function which can be override
* by an external function.
*/
SystemInit();
/*
* Set the "Vector Table Offset Register". From the ARM
* documentation, we got the following information:
*
* Use the Vector Table Offset Register to determine:
* - if the vector table is in RAM or code memory
* - the vector table offset.
*/
*((uint32_t*)0xE000ED08) = (uint32_t)&_stext;
/*
* Copy the initialized data of the ".data" segment
* from the flash to the are in the ram.
*/
pSrc = &_etext;
pDest = &_sdata;
while(pDest < &_edata)
{
*pDest++ = *pSrc++;
}
/*
* Clear the ".bss" segment.
*/
pDest = &_sbss;
while(pDest < &_ebss)
{
*pDest++ = 0;
}
/*
* And now the main function can be called.
* Scotty, energie...
*/
main();
/*
* In case there are problems with the
* "warp drive", stop here.
*/
while(1) {};
} /* ResetHandler */
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