启动文件之__main

Reset_Handler   PROC
                EXPORT  Reset_Handler             [WEAK]
                IMPORT  SystemInit
                IMPORT  SDRAMInit
                IMPORT  __main
                LDR     R0, =SystemInit
                BLX     R0
                LDR     R0, =SDRAMInit
                BLX     R0
                LDR     R0, =__main
                BX      R0
                ENDP