#pragma PRQA_MESSAGES_OFF
时间: 2023-09-19 16:08:00 浏览: 222
#pragma PRQA_MESSAGES_OFF是一种用于抑制代码静态检查工具Helix QAC中消息生成的编译指令。通过使用这个指令,可以暂时关闭与代码相关的错误和警告消息的生成。这个指令可以应用于整个源代码文件或特定的宏扩展中,以达到抑制错误和警告消息的目的。<span class="em">1</span><span class="em">2</span><span class="em">3</span><span class="em">4</span>
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/* * File: ADC.c * Author: tlfte *AD转换,结果在C口和D口的LED上显示,能进行各种通道选择和参考电压,结果对齐方式选择 * Created on 2018年8月6日, 上午10:07 练习AD结果的计算验证,AD_RESULT=VIN×1023÷VREF,讲解887头文件的作用 */ // PIC16F887 Configuration Bit Settings // 'C' source line config statements // CONFIG1 #pragma config FOSC = XT // Oscillator Selection bits (XT oscillator: Crystal/resonator on RA6/OSC2/CLKOUT and RA7/OSC1/CLKIN) #pragma config WDTE = OFF // Watchdog Timer Enable bit (WDT disabled and can be enabled by SWDTEN bit of the WDTCON register) #pragma config PWRTE = OFF // Power-up Timer Enable bit (PWRT disabled) #pragma config MCLRE = ON // RE3/MCLR pin function select bit (RE3/MCLR pin function is digital input, MCLR internally tied to VDD) #pragma config CP = OFF // Code Protection bit (Program memory code protection is disabled) #pragma config CPD = OFF // Data Code Protection bit (Data memory code protection is disabled) #pragma config BOREN = OFF // Brown Out Reset Selection bits (BOR disabled) #pragma config IESO = OFF // Internal External Switchover bit (Internal/External Switchover mode is disabled) #pragma config FCMEN = OFF // Fail-Safe Clock Monitor Enabled bit (Fail-Safe Clock Monitor is disabled) #pragma config LVP = OFF // Low Voltage Programming Enable bit (RB3 pin has digital I/O, HV on MCLR must be used for programming) // CONFIG2 #pragma config BOR4V = BOR40V // Brown-out Reset Selection bit (Brown-out Reset set to 4.0V) #pragma config WRT = OFF // Flash Program Memory Self Write Enable bits (Write protection off) // #pragma config statements should precede project file includes. // Use project enums instead of #define for ON and OFF. #include <xc.h> #define _XTAL_FREQ 4000000 //指明时钟晶振为4MHz,使delay宏定义可以正常使用 void CSH(void); unsigned int AD_SUB(char k); void main( ) { unsigned int y; CSH(); while(1) { __delay_ms(100); //每隔100毫秒循环一次 y=AD_
SUB(0b00000110); //选择通道为AN6,即RA2口 PORTD=y; //将结果的低8位输出到D口LED灯上 y>>=8; //将结果的高8位移位到低8位 PORTC=y; //将结果的高8位输出到C口LED灯上 } } void CSH(void) //初始化函数 { TRISA=0xff; TRISC=0x00; TRISD=0x00; ANSEL=0x40; //选择AN6通道为模拟输入 ADCON1=0xC0; //设置参考电压为VDD和VSS,右对齐结果 } unsigned int AD_SUB(char k) //AD转换函数 { unsigned int AD_RESULT; ADCON0=k<<2; //将选择的通道左移两位,放到ADCON0的低4位上,同时清除其他位 ADCON0|=0x03; //启动AD转换 while(ADCON0&0x02); //等待AD转换完成 AD_RESULT=ADRESH; //将结果的高8位移位到低8位 AD_RESULT<<=8; //将结果的低8位移位到高8位 AD_RESULT|=ADRESL; //将结果的低8位放入结果的低8位上 return AD_RESULT; }
./common.h:12:10: error: the current #pragma pack alignment value is modified in the included file [-Werror,-Wpragma-pack] #include "def_struct.h" ^ ./def_struct.h:8:9: note: previous '#pragma pack' directive that modifies alignment is here #pragma pack(1) ^ common.c:6:10: error: the current #pragma pack alignment value is modified in the included file [-Werror,-Wpragma-pack] #include "common.h" ^ ./def_struct.h:8:9: note: previous '#pragma pack' directive that modifies alignment is here #pragma pack(1)
这是一个编译错误,出现这个错误的原因是在头文件中使用了 #pragma pack(n) 指令来指定结构体成员的对齐方式,但是在包含该头文件的源文件中也使用了 #pragma pack(m) 指令指定不同的对齐方式,导致冲突。
解决这个问题的方法是在头文件中使用 #pragma pack(push, n) 指令将当前的对齐方式压入栈中,然后在结尾处使用 #pragma pack(pop) 指令恢复原来的对齐方式。这样可以保证头文件中的对齐方式不会影响到包含该头文件的源文件。
正确的写法如下:
```
#ifndef DEF_STRUCT_H
#define DEF_STRUCT_H
#pragma pack(push, 1)
// 定义结构体
#pragma pack(pop)
#endif // DEF_STRUCT_H
```
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