IAR下面,要用类似GCC的语法Syntax
The syntax of an inline assembler statement is (similar to the one used by GNU gcc):
asm [volatile]( string [assembler-interface])
string can contain one or more valid assembler instructions or data definition assembler directives, separated by .
For example:
asm("label:nop "
    "b label");
[mw_shl_code=c,true]void WFI_SET(void)
{
        asm("WFI");
}

void INTX_DISABLE(void)
{
        asm("CPSID I "
                "BX LR");
}[/mw_shl_code]