請各位大神幫幫忙，就在51黑電子論壇下載的代碼，是STC電壓表的帖子，下載編譯時出現這個警告（沒改動過任何代碼），求指教下小弟是什么問題，要怎樣解決。編譯里顯示：
Build target 'Target 1'
assembling STARTUP.A51...
compiling STC15ADC.c...
C:\KEIL\C51\INC\STC15W.H(526): warning C322: unknown identifier
C:\KEIL\C51\INC\STC15W.H(528): warning C322: unknown identifier
C:\KEIL\C51\INC\STC15W.H(530): warning C322: unknown identifier
C:\KEIL\C51\INC\STC15W.H(532): warning C322: unknown identifier
C:\KEIL\C51\INC\STC15W.H(534): warning C322: unknown identifier
C:\KEIL\C51\INC\STC15W.H(536): warning C322: unknown identifier
C:\KEIL\C51\INC\STC15W.H(538): warning C322: unknown identifier
linking...
Program Size: data=22.0 xdata=0 code=1674
creating hex file from "STC15ADC"...
"STC15ADC" - 0 Error(s), 7 Warning(s).
查出是這里的問題：
#if (MAIN_Fosc >= 24000000L)
#define ISP_WAIT_FREQUENCY ISP_WAIT_30MHZ
#elif (MAIN_Fosc >= 20000000L)
#define ISP_WAIT_FREQUENCY ISP_WAIT_24MHZ
#elif (MAIN_Fosc >= 12000000L)
#define ISP_WAIT_FREQUENCY ISP_WAIT_20MHZ
#elif (MAIN_Fosc >= 6000000L)
#define ISP_WAIT_FREQUENCY ISP_WAIT_12MHZ
#elif (MAIN_Fosc >= 3000000L)
#define ISP_WAIT_FREQUENCY ISP_WAIT_6MHZ
#elif (MAIN_Fosc >= 2000000L)
#define ISP_WAIT_FREQUENCY ISP_WAIT_3MHZ
#elif (MAIN_Fosc >= 1000000L)
#define ISP_WAIT_FREQUENCY ISP_WAIT_2MHZ
#else
#define ISP_WAIT_FREQUENCY ISP_WAIT_1MHZ
#endif
請各大神指教，感謝！！！！！！！！！！！！！！
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