IAR上面的官方例程没有low_level_init.c，这个文件是不必要的吗？

1）这个__low_level_init 函数是iar开发环境自带的内部函数。不用加入工程，编译的时候会自动加入
2）情况函数说明
/*
* The function __low_level_init it called by the start-up code before
* "main" is called, and before data segment initialization is
* performed.
*
* This is a template file, modify to perform any initialization that
* should take place early.
*
* The return value of this function controls if data segment
* initialization should take place. If 0 is returned, it is bypassed.
*
* For the MSP430 microcontroller family, please consider disabling
* the watchdog timer here, as it could time-out during the data
* segment initialization.
*/