PIC单片机: 解决undefined symbol "lvpdis"/“hs"/"wdtdis"等报错

错误

• undefined symbol "lvpdis"

• undefined symbol “hs"

• undefined symbol "wdtdis"

• 报错代码

  #include <htc.h>
  #include <pic16f877a.h>
  
  __CONFIG(HS & WDTDIS & LVPDIS);
  int main(int argc, char** argv) {
      TRISD  = 0;
      PORTD  = 0b00000111;
      while(1);
      return (EXIT_SUCCESS);
  }
  

寻找头文件位置

• 点击跳转 __CONFIG() 位配置注解

• PICC所实现的头文件位置: C:\Program Files (x86)\HI-TECH Software\PICC\9.83\include

• pic16f877a.h - CONFIG位

  // Config Register: CONFIG
  #define CONFIG               0x2007
  // Oscillator Selection bits
  // RC oscillator
  #define FOSC_EXTRC           0xFFFF // 直接用内部的RC时钟电路
  // HS oscillator
  #define FOSC_HS              0xFFFE // 使用超过4M的石英晶体振荡器
  // XT oscillator
  #define FOSC_XT              0xFFFD // 使用1M到4M的石英晶体振荡器
  // LP oscillator
  #define FOSC_LP              0xFFFC // 使用低于1M的陶瓷振荡器，不是什么感抗震荡
  
  /**************看门狗位*************/
  // Watchdog Timer Enable bit
  // WDT enabled
  #define WDTE_ON              0xFFFF
  // WDT disabled
  #define WDTE_OFF             0xFFFB
  
  /**********电源启动分时器启用位*******/
  // Power-up Timer Enable bit
  // PWRT disabled
  #define PWRTE_OFF            0xFFFF
  // PWRT enabled
  #define PWRTE_ON             0xFFF7
  
  // Brown-out Reset Enable bit
  // BOR enabled
  #define BOREN_ON             0xFFFF
  // BOR disabled
  #define BOREN_OFF            0xFFBF
  
  /*****低电压（单电源）在线串行编程启用位**/
  // Low-Voltage (Single-Supply) In-Circuit Serial Programming Enable bit
  // RB3/PGM pin has PGM function; low-voltage programming enabled
  #define LVP_ON               0xFFFF
  // RB3 is digital I/O, HV on MCLR must be used for programming
  #define LVP_OFF              0xFF7F
  
  /*******EEPROM代码保护位**************/
  // Data EEPROM Memory Code Protection bit
  // Data EEPROM code protection off
  #define CPD_OFF              0xFFFF
  // Data EEPROM code-protected
  #define CPD_ON               0xFEFF
  
  
  // Flash Program Memory Write Enable bits
  // Write protection off; all program memory may be written to by EECON control
  #define WRT_OFF              0xFFFF
  // 0000h to 00FFh write-protected; 0100h to 1FFFh may be written to by EECON control
  #define WRT_256              0xFDFF
  // 0000h to 07FFh write-protected; 0800h to 1FFFh may be written to by EECON control
  #define WRT_1FOURTH          0xFBFF
  // 0000h to 0FFFh write-protected; 1000h to 1FFFh may be written to by EECON control
  #define WRT_HALF             0xF9FF
  
  
  /************在线调试模式位*************/
  // In-Circuit Debugger Mode bit
  // In-Circuit Debugger disabled, RB6 and RB7 are general purpose I/O pins
  #define DEBUG_OFF            0xFFFF
  // In-Circuit Debugger enabled, RB6 and RB7 are dedicated to the debugger
  #define DEBUG_ON             0xF7FF
  
  /**************代码保护位*************/
  // Flash Program Memory Code Protection bit
  // Code protection off
  #define CP_OFF               0xFFFF 
  // All program memory code-protected
  #define CP_ON                0xDFFF
  

转换为以下代码即可

#include <htc.h> // Header file pic16f877a.h included directly. Use #include <htc.h> instead.
#include <pic16f877a.h>

/*
 * 
 */
__CONFIG(FOSC_HS & WDTE_OFF & LVP_OFF & CP_ON);

int main(int argc, char** argv) {
    TRISD  = 0;
    PORTD  = 0b00000111;
    while(1);
    return (EXIT_SUCCESS);
}