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C/C++ Util函数整理

news 2026/7/28 19:51:24

嵌入式C/C++开发中，常用工具类函数整理分类，记录便于查询使用。

1、数组数据处理

voidSetU16(uint8_t*buffer,uint16_t value){buffer[0]=value&0xff;buffer[1]=(value>>8)&0xff;}uint16_tGetU16(constuint8_t*buffer){uint16_t value=0;value|=buffer[0];value|=(buffer[1]<<8);returnvalue;}voidSetU32(uint8_t*buffer,uint32_t value){buffer[0]=value&0xff;buffer[1]=(value>>8)&0xff;buffer[2]=(value>>16)&0xff;buffer[3]=(value>>24)&0xff;}uint32_tGetU24(constuint8_t*buffer){uint32_t value=0;value|=buffer[0];value|=(buffer[1]<<8);value|=(buffer[2]<<16);returnvalue;}voidSetU24(uint8_t*buffer,uint32_t value){buffer[0]=value&0xff;buffer[1]=(value>>8)&0xff;buffer[2]=(value>>16)&0xff;}uint32_tGetU32(constuint8_t*buffer){uint32_t value=0;value|=buffer[0];value|=(buffer[1]<<8);value|=(buffer[2]<<16);value|=(buffer[3]<<24);returnvalue;}voidSetU16Big(uint8_t*buffer,uint16_t value){buffer[0]=(value>>8)&0xff;buffer[1]=value&0xff;}uint16_tGetU16Big(constuint8_t*buffer){uint16_t value=0;value|=buffer[1];value|=(buffer[0]<<8);returnvalue;}voidSetU24Big(uint8_t*buffer,uint32_t value){buffer[2]=value&0xff;buffer[1]=(value>>8)&0xff;buffer[0]=(value>>16)&0xff;}uint32_tGetU24Big(constuint8_t*buffer){uint32_t value=0;value|=buffer[2];value|=(buffer[1]<<8);value|=(buffer[0]<<16);returnvalue;}voidSetU32Big(uint8_t*buffer,uint32_t value){buffer[3]=value&0xff;buffer[2]=(value>>8)&0xff;buffer[1]=(value>>16)&0xff;buffer[0]=(value>>24)&0xff;}uint32_tGetU32Big(constuint8_t*buffer){uint32_t value=0;value|=buffer[3];value|=(buffer[2]<<8);value|=(buffer[1]<<16);value|=(buffer[0]<<24);returnvalue;}

2、BCD与HEX转换

uint8_tBcdToHex(uint8_t bcd){uint8_t hex=0;if(((bcd&0x0f)>0x09)||((bcd&0xf0)>0x90)){return0;}hex+=bcd&0x0f;hex+=((bcd>>4)&0xf)*10;returnhex;}uint8_tHexToBcd(uint8_t hex){uint8_t bcd=0;if(hex>99){return0;}bcd+=hex%10;bcd+=((hex/10)%10)<<4;returnbcd;}

3、数据校验

uint8_tCheckSum(constuint8_t*data,uint32_t length){uint8_t check=0;while(length--){check+=*data++;}return0x100-check;}uint8_tCheckXor(constuint8_t*data,uint32_t length){uint8_t check=0;while(length--){check^=*data++;}return~check;}// x16+x12+x5+1staticconstuint16_t CRC16_TABLE[]={0x0000,0x1189,0x2312,0x329b,0x4624,0x57ad,0x6536,0x74bf,0x8c48,0x9dc1,0xaf5a,0xbed3,0xca6c,0xdbe5,0xe97e,0xf8f7,0x1081,0x0108,0x3393,0x221a,0x56a5,0x472c,0x75b7,0x643e,0x9cc9,0x8d40,0xbfdb,0xae52,0xdaed,0xcb64,0xf9ff,0xe876,0x2102,0x308b,0x0210,0x1399,0x6726,0x76af,0x4434,0x55bd,0xad4a,0xbcc3,0x8e58,0x9fd1,0xeb6e,0xfae7,0xc87c,0xd9f5,0x3183,0x200a,0x1291,0x0318,0x77a7,0x662e,0x54b5,0x453c,0xbdcb,0xac42,0x9ed9,0x8f50,0xfbef,0xea66,0xd8fd,0xc974,0x4204,0x538d,0x6116,0x709f,0x0420,0x15a9,0x2732,0x36bb,0xce4c,0xdfc5,0xed5e,0xfcd7,0x8868,0x99e1,0xab7a,0xbaf3,0x5285,0x430c,0x7197,0x601e,0x14a1,0x0528,0x37b3,0x263a,0xdecd,0xcf44,0xfddf,0xec56,0x98e9,0x8960,0xbbfb,0xaa72,0x6306,0x728f,0x4014,0x519d,0x2522,0x34ab,0x0630,0x17b9,0xef4e,0xfec7,0xcc5c,0xddd5,0xa96a,0xb8e3,0x8a78,0x9bf1,0x7387,0x620e,0x5095,0x411c,0x35a3,0x242a,0x16b1,0x0738,0xffcf,0xee46,0xdcdd,0xcd54,0xb9eb,0xa862,0x9af9,0x8b70,0x8408,0x9581,0xa71a,0xb693,0xc22c,0xd3a5,0xe13e,0xf0b7,0x0840,0x19c9,0x2b52,0x3adb,0x4e64,0x5fed,0x6d76,0x7cff,0x9489,0x8500,0xb79b,0xa612,0xd2ad,0xc324,0xf1bf,0xe036,0x18c1,0x0948,0x3bd3,0x2a5a,0x5ee5,0x4f6c,0x7df7,0x6c7e,0xa50a,0xb483,0x8618,0x9791,0xe32e,0xf2a7,0xc03c,0xd1b5,0x2942,0x38cb,0x0a50,0x1bd9,0x6f66,0x7eef,0x4c74,0x5dfd,0xb58b,0xa402,0x9699,0x8710,0xf3af,0xe226,0xd0bd,0xc134,0x39c3,0x284a,0x1ad1,0x0b58,0x7fe7,0x6e6e,0x5cf5,0x4d7c,0xc60c,0xd785,0xe51e,0xf497,0x8028,0x91a1,0xa33a,0xb2b3,0x4a44,0x5bcd,0x6956,0x78df,0x0c60,0x1de9,0x2f72,0x3efb,0xd68d,0xc704,0xf59f,0xe416,0x90a9,0x8120,0xb3bb,0xa232,0x5ac5,0x4b4c,0x79d7,0x685e,0x1ce1,0x0d68,0x3ff3,0x2e7a,0xe70e,0xf687,0xc41c,0xd595,0xa12a,0xb0a3,0x8238,0x93b1,0x6b46,0x7acf,0x4854,0x59dd,0x2d62,0x3ceb,0x0e70,0x1ff9,0xf78f,0xe606,0xd49d,0xc514,0xb1ab,0xa022,0x92b9,0x8330,0x7bc7,0x6a4e,0x58d5,0x495c,0x3de3,0x2c6a,0x1ef1,0x0f78};uint16_tCheckCrc16(constuint8_t*data,uint32_t length){uint16_t crc16=0xffff;while(length--){crc16=CRC16_TABLE[(crc16^*data++)&0xFF]^(crc16>>8);}returncrc16^0xffff;}

4、时间日期处理

staticuint16_t yearH=2000;typedefstruct{uint8_t year;uint8_t month;uint8_t day;uint8_t hour;uint8_t minute;uint8_t second;uint8_t week;}DateTime;// DateTime转换为SecondsboolRtcDateTimeToSeconds(DateTime*dateTime,uint32_t*seconds){uint32_t year;uint32_t era,yoe;uint32_t doe,doy;uint32_t days,mp;year=yearH+dateTime->year-(dateTime->month<=2?1:0);era=(year>=0?year:year-399)/400;yoe=year-era*400;mp=dateTime->month+(dateTime->month>2?-3:9);doy=(153*mp+2)/5+dateTime->day-1;doe=yoe*365+yoe/4-yoe/100+doy;days=era*146097+doe-719468;*seconds=((days*24+dateTime->hour)*60+dateTime->minute)*60+dateTime->second;returntrue;}// Seconds转换为DateTimeboolRtcSecondsToDateTime(uint32_t seconds,DateTime*dateTime){uint32_t year;uint32_t era,yoe;uint32_t doe,doy;uint32_t days,mp;days=seconds/86400+719468;era=(days>=0?days:days-146096)/146097;doe=days-era*146097;yoe=(doe-doe/1460+doe/36524-doe/146096)/365;doy=doe-(365*yoe+yoe/4-yoe/100);mp=(5*doy+2)/153;year=yoe+era*400+(dateTime->month<=2?1:0);dateTime->day=doy-(153*mp+2)/5+1;dateTime->month=mp+(mp<10?3:-9);dateTime->year=year%100;yearH=year/100*100;returntrue;}

5、数据位反转

typedefenum{BYTE=1,HALF_WORD=2,WORD=3}REFLECTED_MODE;uint32_tReflectedData(uint32_t data,REFLECTED_MODE mode){switch(mode){caseWORD:data=((data&0xffff0000)>>16)|((data&0x0000ffff)<<16);caseHALF_WORD:data=((data&0xff00ff00)>>8)|((data&0x00ff00ff)<<8);caseBYTE:data=((data&0xf0f0f0f0)>>4)|((data&0x0f0f0f0f)<<4);data=((data&0xcccccccc)>>2)|((data&0x33333333)<<2);data=((data&0xaaaaaaaa)>>1)|((data&0x55555555)<<1);break;}returndata;}voidReflectedBuffer(constuint8_t*src,uint8_t*dest,uint32_t length,REFLECTED_MODE mode){uint32_t i;switch(mode){caseWORD:if((length%4)!=0){return;}for(i=0;i<length;i+=4){SetU32(&dest[i],ReflectedData(GetU32(&src[i]),WORD));}break;caseHALF_WORD:if((length%2)!=0){return;}for(i=0;i<length;i+=2){SetU16(&dest[i],ReflectedData(GetU16(&src[i]),HALF_WORD));}break;caseBYTE:for(i=0;i<length;i++){dest[i]=ReflectedData(src[i],BYTE);}break;}}voidReflectedBufferBig(constuint8_t*src,uint8_t*dest,uint32_t length,REFLECTED_MODE mode){uint32_t i;switch(mode){caseWORD:if((length%4)!=0){return;}for(i=0;i<length;i+=4){SetU32Big(&dest[i],ReflectedData(GetU32Big(&src[i]),WORD));}break;caseHALF_WORD:if((length%2)!=0){return;}for(i=0;i<length;i+=2){SetU16Big(&dest[i],ReflectedData(GetU16Big(&src[i]),HALF_WORD));}break;caseBYTE:for(i=0;i<length;i++){dest[i]=ReflectedData(src[i],BYTE);}break;}}
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