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msp430 精准延时函数 编译出错

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已定义以下宏定义:

#define CPU_F        ((double)8000000)
#define delay_us(x)   __delay_cycles(long)(CPU_F*(double)x/1000000.0)
#define delay_ms(x)   __delay_cycles(long)(CPU_F*(double)x/1000.0)

函数内部调用:delay_ms(1);

编译报错:Error[Pe029]: expected an expression C:\Users\87520\Desktop\SI4463_RX\main.c 72

Error[Pe109]: expression preceding parentheses of apparent call must have (pointer-to-) function type C:\Users\87520\Desktop\SI4463_RX\main.c 72 

请问这是为什么?


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