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One HAL head file: /**********************************/ #ifndef __HAL_H__ #define __HAL_H__ #define DATA_BUS P0 // sbit MCU_TXD = P1^0; // sbit MCU_RXD = P1^1; // sbit MCU_NC = P1^2; sbit D12_A0 = P1^3; sbit MCU_INT1 = P1^4; // sbit MCU_RST = P1^5; sbit WR_N = P1^6; sbit RD_N = P1^7; sbit LED1 = P3^0; sbit LED2 = P3^1; #define A0_COMMAND D12_A0=1 #define A0_DATA D12_A0=0 #define DATABUS_READ(x) DATA_BUS = 0xFF; D12_RD_N = 0; x = DATA_BUS; D12_RD_N = 1 #define DATABUS_WRITE(x) D12_WR_N = 0; DATA_BUS = x; D12_WR_N = 1 #define DISABLE EA=0 #define ENABLE EA=1 #endif /**********************************/ While compiling, it is reported that on every C file containing the head file: ERROR C231:'D12_A0' redifinition ERROR C231:'WR_N' redifinition ERROR C231:'RD_N' redifinition No other place in the project define these three, I have searched for within but no discovery. If i rem all definitions but these three in this head file, nothing change. If i merely rem these three and left others untouch, no compiling error any more.
By the way, I can not accept the method that that post mentioned. It will make maintanence more difficult as it was before the ifndef-def-endif appear. For easier maintenance you may use the following approach: In your C code files place a definition like
#define SENSORS_MODULE
#ifndef SENSORS_H #define SENSORS_H #ifdef _DECL #undef _DECL #endif #ifdef SENSORS_MODULE #define _DECL #else #define _DECL extern #endif _DECL UI16 GetVoltage(); _DECL UI8 ui8_SomeVariable; #endif // SENSORS_H