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最新推荐文章于 2024-06-05 09:56:35 发布

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分类专栏： STM32编程

本文链接：https://blog.youkuaiyun.com/yunjie167/article/details/78502824

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14 篇文章

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这篇笔记涵盖了C语言中的一些实用技巧，包括宏定义、字节反转操作如Hex与BCD转换、大小端转换，以及冒泡排序算法。还讨论了调试技巧、联合体的使用、STM32位带宏、软件定时器实现和CRC校验（crc16与crc8）。

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0. 常用宏

#define SWAP(a,b)				a^=b,b^=a,a^=b
#define MEM_SIZE(type, member)  sizeof(((type*)0)->member)
#define OFFSETOF(type, member)  ( (int)(&( ( (type*)0)->member ) ) )
#define COUNTOF(a)				(a/a[0])

1. 字节反转

u8 resvByte(u8 byte)
{
  u8 ret=0;
  int i;

  for(i=0;i<8;i++)
  {
    ret<<=1;
    if(byte&mask[i])
      ret++;
  }
  return ret;
}

1.1 Hex与BCD相互转换

u8 Bcd2Hex(u8 bcd_data)
{
  u8 hex_data;
  
  hex_data=((bcd_data&0xf0)>>4)*10+(bcd_data&0x0f);
  return hex_data;	
}

u8 Hex2Bcd(u8 hex_data)
{
  u8 temp;
  
  temp=((hex_data/10)<<4)+(hex_data%10);
  return temp;
}

1.2 大小端转换

uint32_t htonl(uint32_t a)
{
	return ((a >> 24) & 0x000000ff) |
	       ((a >>  8) & 0x0000ff00) |
	       ((a <<  8) & 0x00ff0000) |
	       ((a << 24) & 0xff000000);
}

uint16_t htons(uint16_t a)
{
	return ((a >> 8) & 0x00ff) | ((a << 8) & 0xff00);
}

1.3 Hex与字符串互相转换


static const char strtable[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
                                'A', 'B', 'C', 'D', 'E', 'F'
                               }; 

//将Hex变成字符串
int hex2str(u8 *hex, u16 src_len, u8 *buf, u16 buf_len)
{
	int i, j;

	if((buf_len % 2) == 0) {
		buf_len--;
	}

	for(i = 0, j = 0; i < buf_len - 1 && j < src_len; j++) {
		buf[i++] = strtable[hex[j] >> 4];
		buf[i++] = strtable[hex[j] & 0x0f];
	}
	buf[i] = '\0';

	return i;
}

//十六进制字符串转换成hex(所有的字母都是大写的)
int str2hex(const u8 *s, u8 *d, u16 n)
{
	int i, cnt;
	u8 hex;

	for (i = 0, cnt = 0, hex = 0; n && ( (s[i] >= '0' && s[i] <= '9') || (s[i] >= 'A' && s[i] <= 'F') ); i++) {
		if (s[i] > '9') {	//字母处理
			if(s[i] >= 'a' && s[i] <= 'f') {	//统一转换成大写的
				hex = (hex << 4) + (10 + s[i] - 'a');   	//hex = 16*hex + (10+s[i]-'A');
			} else {
				hex = (hex << 4) + (10 + s[i] - 'A');   	//hex = 16*hex + (10+s[i]-'A');
			}

		} else {
			hex = (hex << 4) + (s[i] - '0');  		//hex = 16*hex + (s[i]-'0');
		}
		cnt++;
		if(cnt >= 2) {
			cnt = 0;
			d[i / 2] = hex;
			hex = 0;
			n--;
		}
	}

	if(n == 0) {
		return 0;
	}
	return -1;
}

2. 冒泡排序

void BubbleSort(u16 *p,int n)
{
  int i,j;
  
  for(j=0;j<n-1;j++)  
  {
    for(i=0;i<n-1-j;i++) 
    {
      if(p[i]>p[i+1])
        SWAP(p[i],p[i+1]);
    }
  }
}

3. 常用宏

#define Countof(a) (sizeof(a)/sizeof(a[0]))
#define SWAP(a,b) a^=b,b^=a,a^=b

4. 调试时候会用到的一些技巧

#include "my_ram_log.h"
#include <string.h>
#include <stdio.h>
#include <stdarg.h>
#include "uart.h"

#if LOG_ENABLED==1

ram_log_t ram_log;
#define ITEM_LOG_BUFFER 128

//自动添加换行
void _logFIFO_write_string(const uint8_t *s)
{
	while(*s)
	{
		ram_log.buff[ram_log.wirte_idx++]=*s++;
	}
	
	if(ram_log.wirte_idx>RAM_LOG_BUFFER_SIZE-ITEM_LOG_BUFFER)
		memset(&ram_log,0,sizeof(ram_log));
}


static char writestr[ITEM_LOG_BUFFER];

void _logFIFO_write_fmt(char* fmt,...)
{  
	__disable_irq();
	va_list ap;
	va_start(ap,fmt);
	vsprintf(writestr,fmt,ap);
	va_end(ap);

	logFIFO_write_string((uint8_t *)writestr);
	__enable_irq();
}

void _printAllBuffLog(void)
{
	int len=ram_log.wirte_idx;
	int i=0;
	
	while(len>0)
	{
		SendData(ram_log.buff[i++]);
		len--;
	}
	memset(&ram_log,0,sizeof(ram_log));
}

#endif

#ifndef __MY_RAM_LOG_H__
#define __MY_RAM_LOG_H__


#include <stdint.h>
#include "config.h"


#define RAM_LOG_BUFFER_SIZE 0x1000


typedef struct {
	int read_idx;
	int wirte_idx;
	uint8_t buff[RAM_LOG_BUFFER_SIZE];
}ram_log_t;


extern ram_log_t ram_log;


void logFIFO_write_string(const uint8_t *s);
uint8_t * logFIFO_read_line(void);
void _printAllBuffLog(void);
void _logFIFO_write_string(const uint8_t *s);
void _logFIFO_write_fmt(char* fmt,...) __attribute__ ((format(printf,1,2)));


#if LOG_ENABLED==1
	#define printAllBuffLog(...) 		_printAllBuffLog(__VA_ARGS__)
	#define logFIFO_write_string(...) 	_logFIFO_write_string(__VA_ARGS__)
	#define logFIFO_write_fmt(...) 		_logFIFO_write_fmt(__VA_ARGS__)
#else
	#define printAllBuffLog(...)
	#define logFIFO_write_string(...)
	#define logFIFO_write_fmt(...)
#endif


#endif

5. 联合体相关使用技巧

union FL
{
  unsigned char byte[4];
  long word;
  float single;
};
extern union FL UnionVal;

union FL UnionVal;
UnionVal.byte[0]=Recv_Data(0);
UnionVal.byte[1]=Recv_Data(1);
UnionVal.byte[2]=Recv_Data(2);
UnionVal.byte[3]=Recv_Data(3);
MySavaData.k=UnionVal.single;

6. stm32位带使用宏

#ifndef __BITOPER_H
#define __BITOPER_H	

#if 1   //1-stm32l   0-stm32f
  #include "stm32l1xx.h" 
  #define ODR_OFFSET        20
  #define IDR_OFFSET        16 
#else
  #include "stm32f10x.h"	
  #define ODR_OFFSET        12
  #define IDR_OFFSET        8 
#endif
				   	 
//位带操作,实现51类似的GPIO控制功能
//具体实现思想,参考<<CM3权威指南>>第五章(87页~92页).
//IO口操作宏定义
#define BITBAND(addr, bitnum) ((addr & 0xF0000000)+0x2000000+((addr &0xFFFFF)<<5)+(bitnum<<2)) 
#define MEM_ADDR(addr)  *((volatile unsigned long  *)(addr)) 
#define BIT_ADDR(addr, bitnum)   MEM_ADDR(BITBAND(addr, bitnum)) 


//IO口地址映射
#define GPIOA_ODR_Addr    (GPIOA_BASE+ODR_OFFSET) 
#define GPIOB_ODR_Addr    (GPIOB_BASE+ODR_OFFSET) 
#define GPIOC_ODR_Addr    (GPIOC_BASE+ODR_OFFSET) 
#define GPIOD_ODR_Addr    (GPIOD_BASE+ODR_OFFSET) 
#define GPIOE_ODR_Addr    (GPIOE_BASE+ODR_OFFSET) 
#define GPIOF_ODR_Addr    (GPIOF_BASE+ODR_OFFSET)   
#define GPIOG_ODR_Addr    (GPIOG_BASE+ODR_OFFSET)
#define GPIOH_ODR_Addr    (GPIOH_BASE+ODR_OFFSET)   

#define GPIOA_IDR_Addr    (GPIOA_BASE+IDR_OFFSET) 
#define GPIOB_IDR_Addr    (GPIOB_BASE+IDR_OFFSET) 
#define GPIOC_IDR_Addr    (GPIOC_BASE+IDR_OFFSET) 
#define GPIOD_IDR_Addr    (GPIOD_BASE+IDR_OFFSET) 
#define GPIOE_IDR_Addr    (GPIOE_BASE+IDR_OFFSET) 
#define GPIOF_IDR_Addr    (GPIOF_BASE+IDR_OFFSET) 
#define GPIOG_IDR_Addr    (GPIOG_BASE+IDR_OFFSET) 
#define GPIOH_IDR_Addr    (GPIOH_BASE+IDR_OFFSET) 
 
//IO口操作,只对单一的IO口!
//确保n的值小于16!
#define PAout(n)   BIT_ADDR(GPIOA_ODR_Addr,n)  //输出 
#define PAin(n)    BIT_ADDR(GPIOA_IDR_Addr,n)  //输入 

#define PBout(n)   BIT_ADDR(GPIOB_ODR_Addr,n)  //输出 
#define PBin(n)    BIT_ADDR(GPIOB_IDR_Addr,n)  //输入 

#define PCout(n)   BIT_ADDR(GPIOC_ODR_Addr,n)  //输出 
#define PCin(n)    BIT_ADDR(GPIOC_IDR_Addr,n)  //输入 

#define PDout(n)   BIT_ADDR(GPIOD_ODR_Addr,n)  //输出 
#define PDin(n)    BIT_ADDR(GPIOD_IDR_Addr,n)  //输入 

#define PEout(n)   BIT_ADDR(GPIOE_ODR_Addr,n)  //输出 
#define PEin(n)    BIT_ADDR(GPIOE_IDR_Addr,n)  //输入

#define PFout(n)   BIT_ADDR(GPIOF_ODR_Addr,n)  //输出 
#define PFin(n)    BIT_ADDR(GPIOF_IDR_Addr,n)  //输入

#define PGout(n)   BIT_ADDR(GPIOG_ODR_Addr,n)  //输出 
#define PGin(n)    BIT_ADDR(GPIOG_IDR_Addr,n)  //输入

#define PHout(n)   BIT_ADDR(GPIOH_ODR_Addr,n)  //输出 
#define PHin(n)    BIT_ADDR(GPIOH_IDR_Addr,n)  //输入
#endif

7. 软件定时器

/************************
简单定时器
*************************/
#include "simplesofttime.h"
#include "common.h"

long m35overtime[ST_IDX_MAX];

void Init_SimpeTime(void)
{
	ST_IDX i;
	
	for(i=ST_M35_OV;i<ST_IDX_MAX;i++)
	{
		KillSimpleTime(i);
	}
}

void SetM35OverTime(ST_IDX idx, long overtime)
{
	if(idx>=ST_IDX_MAX)
	{
		while(1);
	}
	m35overtime[idx]=overtime/(1000/HZ);
}

//返回1表示超时了
int GetM35OvTime(ST_IDX idx)
{
	if(m35overtime[idx]<0)
		return 1;
	return 0;
}

//这里只能简单的"杀掉"这个定时器
void KillSimpleTime(ST_IDX idx)
{
	if(idx>=ST_IDX_MAX)
	{
		while(1);
	}
	m35overtime[idx]=((1ul<<31)-1); //2147483647*5ms=10737418s/3600=2982h/24=124day
}

/* 该函数5ms调用一次 */
void ScheduleSimpleTimer(void)
{
	ST_IDX i;
	
	for(i=ST_M35_OV;i<ST_IDX_MAX;i++)
	{
		m35overtime[i]--;
	}
}

//1天调用一次
void LongTimeRun(void)
{
	ST_IDX i;
	
	for(i=ST_M35_OV;i<ST_IDX_MAX;i++)
	{
		if(m35overtime[i]>1e9)
		{
			m35overtime[i]=((1ul<<31)-1);
		}
	}
}

#ifndef __SIMPLE_SOFT_TIME_H_
#define __SIMPLE_SOFT_TIME_H_


#define MIAO		1000ul
#define MIN		60*MIAO




#define UPLOAD_SENSOR_ITV     	10*MIN				//传感器数据上报间隔
#define OFFLINE_WAIT_TIME 	8*MIN 				




typedef enum {
	ST_General_Ov=0,
	ST_HEAT_Ov, 		//1
	ST_M35_HEAT_OV,		//2
	ST_Host_Delay,		//3
	ST_GPS_Ov,			//4
	ST_Register_Ov,		//5
	ST_IDX_MAX
}ST_IDX;




void ScheduleSimpleTimer(void);
void SetM35OverTime(ST_IDX idx, long overtime);
int GetM35OvTime(ST_IDX idx);
void KillSimpleTime(ST_IDX idx);
void Init_SimpeTime(void);
void LongTimeRun(void);


#endif

8. crc16

#include "crc16.h"

static const unsigned char aucCRCHi[] = {
    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
    0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
    0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
    0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
    0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
    0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
    0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
    0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
    0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
    0x00, 0xC1, 0x81, 0x40
};

static const unsigned char aucCRCLo[] = {
    0x00, 0xC0, 0xC1, 0x01, 0xC3, 0x03, 0x02, 0xC2, 0xC6, 0x06, 0x07, 0xC7,
    0x05, 0xC5, 0xC4, 0x04, 0xCC, 0x0C, 0x0D, 0xCD, 0x0F, 0xCF, 0xCE, 0x0E,
    0x0A, 0xCA, 0xCB, 0x0B, 0xC9, 0x09, 0x08, 0xC8, 0xD8, 0x18, 0x19, 0xD9,
    0x1B, 0xDB, 0xDA, 0x1A, 0x1E, 0xDE, 0xDF, 0x1F, 0xDD, 0x1D, 0x1C, 0xDC,
    0x14, 0xD4, 0xD5, 0x15, 0xD7, 0x17, 0x16, 0xD6, 0xD2, 0x12, 0x13, 0xD3,
    0x11, 0xD1, 0xD0, 0x10, 0xF0, 0x30, 0x31, 0xF1, 0x33, 0xF3, 0xF2, 0x32,
    0x36, 0xF6, 0xF7, 0x37, 0xF5, 0x35, 0x34, 0xF4, 0x3C, 0xFC, 0xFD, 0x3D,
    0xFF, 0x3F, 0x3E, 0xFE, 0xFA, 0x3A, 0x3B, 0xFB, 0x39, 0xF9, 0xF8, 0x38,
    0x28, 0xE8, 0xE9, 0x29, 0xEB, 0x2B, 0x2A, 0xEA, 0xEE, 0x2E, 0x2F, 0xEF,
    0x2D, 0xED, 0xEC, 0x2C, 0xE4, 0x24, 0x25, 0xE5, 0x27, 0xE7, 0xE6, 0x26,
    0x22, 0xE2, 0xE3, 0x23, 0xE1, 0x21, 0x20, 0xE0, 0xA0, 0x60, 0x61, 0xA1,
    0x63, 0xA3, 0xA2, 0x62, 0x66, 0xA6, 0xA7, 0x67, 0xA5, 0x65, 0x64, 0xA4,
    0x6C, 0xAC, 0xAD, 0x6D, 0xAF, 0x6F, 0x6E, 0xAE, 0xAA, 0x6A, 0x6B, 0xAB,
    0x69, 0xA9, 0xA8, 0x68, 0x78, 0xB8, 0xB9, 0x79, 0xBB, 0x7B, 0x7A, 0xBA,
    0xBE, 0x7E, 0x7F, 0xBF, 0x7D, 0xBD, 0xBC, 0x7C, 0xB4, 0x74, 0x75, 0xB5,
    0x77, 0xB7, 0xB6, 0x76, 0x72, 0xB2, 0xB3, 0x73, 0xB1, 0x71, 0x70, 0xB0,
    0x50, 0x90, 0x91, 0x51, 0x93, 0x53, 0x52, 0x92, 0x96, 0x56, 0x57, 0x97,
    0x55, 0x95, 0x94, 0x54, 0x9C, 0x5C, 0x5D, 0x9D, 0x5F, 0x9F, 0x9E, 0x5E,
    0x5A, 0x9A, 0x9B, 0x5B, 0x99, 0x59, 0x58, 0x98, 0x88, 0x48, 0x49, 0x89,
    0x4B, 0x8B, 0x8A, 0x4A, 0x4E, 0x8E, 0x8F, 0x4F, 0x8D, 0x4D, 0x4C, 0x8C,
    0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x86, 0x82, 0x42, 0x43, 0x83,
    0x41, 0x81, 0x80, 0x40
};

unsigned int usMBCRC16(unsigned char * pucFrame, int usLen)
{
	unsigned char ucCRCHi = 0xFF;
	unsigned char ucCRCLo = 0xFF;
	int iIndex;

	if(usLen<0)
		return 0;

	while( usLen-- )
	{
		iIndex = ucCRCLo ^ *( pucFrame++ );
		ucCRCLo = ( unsigned char )( ucCRCHi ^ aucCRCHi[iIndex] );
		ucCRCHi = aucCRCLo[iIndex];
	}

	return ( unsigned int )( ucCRCHi << 8 | ucCRCLo );
}

9. crc8

/********************************************************************
 功  能: 8位CRC查表
********************************************************************/
const unsigned char CRC8_Tab[] = {
        0, 94,188,226, 97, 63,221,131,194,156,126, 32,163,253, 31, 65,
      157,195, 33,127,252,162, 64, 30, 95,  1,227,189, 62, 96,130,220,
       35,125,159,193, 66, 28,254,160,225,191, 93,  3,128,222, 60, 98,
      190,224,  2, 92,223,129, 99, 61,124, 34,192,158, 29, 67,161,255,
       70, 24,250,164, 39,121,155,197,132,218, 56,102,229,187, 89,  7,
      219,133,103, 57,186,228,  6, 88, 25, 71,165,251,120, 38,196,154,
      101, 59,217,135,  4, 90,184,230,167,249, 27, 69,198,152,122, 36,
      248,166, 68, 26,153,199, 37,123, 58,100,134,216, 91,  5,231,185,
      140,210, 48,110,237,179, 81, 15, 78, 16,242,172, 47,113,147,205,
       17, 79,173,243,112, 46,204,146,211,141,111, 49,178,236, 14, 80,
      175,241, 19, 77,206,144,114, 44,109, 51,209,143, 12, 82,176,238,
       50,108,142,208, 83, 13,239,177,240,174, 76, 18,145,207, 45,115,
      202,148,118, 40,171,245, 23, 73,  8, 86,180,234,105, 55,213,139,
       87,  9,235,181, 54,104,138,212,149,203, 41,119,244,170, 72, 22,
      233,183, 85, 11,136,214, 52,106, 43,117,151,201, 74, 20,246,168,
      116, 42,200,150, 21, 75,169,247,182,232, 10, 84,215,137,107, 53};

/********************************************************************
 功  能: 8位CRC计算
 输  入: 数据起始地址 数据长度
 返  回: 8位CRC码
********************************************************************/
unsigned char CheckCRC8(unsigned char *adr, unsigned char len)
{
	unsigned char x = 0, y;
	while(len --)
	{
		y = x ^ *adr ++;
		x = CRC8_Tab[y];
	}
	return(x);
}

10. 时间相关的

static const u8 MonthTab[] = {0,31,28,31,30,31,30,31,31,30,31,30,31};

static void incday(void)
{
	systime.ri++;
	if (systime.ri > MonthTab[systime.yue])
	{
		if ((systime.yue != 2) || ((systime.nian & 0x03) != 0) || (systime.ri != 29))  //不是闰年2月29号
		{
			systime.ri = 1;
			systime.yue++;
			if (systime.yue > 12)  //超过12月，年+1
			{
				systime.yue = 1;
				systime.nian++;
			}//nian
		}//yue
	} //ri
}

void SysClock(void)
{
	systime.miao++;
	miao_flag=1;
  if(systime.miao>59)
  {
    systime.miao=0;
    fen_flag=1;
    systime.fen++;
    if(systime.fen>59)
    {
      systime.fen=0;
      systime.shi++;
			shi_flag=1;
			
      if(systime.shi>23)
      {  
				systime.shi=0;				
				incday();
				LongTimeRun();
			}
			
			if(systime.shi==1)
				systime.isSync=0;	//每天校时一次不能在0点校时
    }
  }
}

void UTCTimeProcess(t_systime *systime)
{
	systime->shi+=8;
	if(systime->shi>=24)
	{
		systime->shi%=24;
		incday();
	}
}

typedef struct {
	u16 nian;
	u8 yue;
	u8 week;
	
	u8 ri;
	u8 shi;
	u8 fen;
	u8 miao;
} SystemTime_t;


#define SECOND_OF_DAY	    86400
unsigned char const DayOfMon[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
#define YEAR_OFFSET			1970

u32 GetSecondTime(SystemTime_t *date_time)
{
	u16 iYear, iMon, iDay, iHour, iMin, iSec;
	u16 i, Cyear = 0;
	u32 CountSec = 0;

	iYear = date_time->nian;
	iMon = date_time->yue;
	iDay = date_time->ri;
	iHour = date_time->shi;
	iMin = date_time->fen;
	iSec = date_time->miao;

	if(iYear < YEAR_OFFSET) {
		return 0;
	}

	for(i = YEAR_OFFSET; i < iYear; i++) {
		if(((i % 4 == 0) && (i % 100 != 0)) || (i % 400 == 0)) {
			Cyear++;
		}
	}

	CountSec = Cyear * 366 + (iYear - YEAR_OFFSET - Cyear) * 365;

	for(i = 1; i < iMon; i++) {
		if((i == 2) && (((iYear % 4 == 0) && (iYear % 100 != 0)) || (iYear % 400 == 0))) {
			CountSec += 29;
		} else {
			CountSec += DayOfMon[i - 1];
		}
	}

	CountSec += (iDay - 1);

	CountSec = CountSec * SECOND_OF_DAY + iHour * 3600l + iMin * 60l + iSec; //2147483647-616623320=1530860327/86400=17718.29/365=48年

	return CountSec;
}

/********************************************************************************************************
* FunctionName: GetDateTimeFromSecond()
* Description: unix time转化为常用格式
* EntryParameter :
* ReturnValue:
********************************************************************************************************/
void GetDateTimeFromSecond(unsigned long lSec, SystemTime_t *date_time)
{
	int i, j, iDay;
	u32 lDay;

	lDay = lSec / SECOND_OF_DAY;
	lSec = lSec % SECOND_OF_DAY;

	i = YEAR_OFFSET;
	while(lDay > 365) {
		if(((i % 4 == 0) && (i % 100 != 0)) || (i % 400 == 0)) { //闰年
			lDay -= 366;
		} else {
			lDay -= 365;
		}
		i++;
	}
	if((lDay == 365) && !(((i % 4 == 0) && (i % 100 != 0)) || (i % 400 == 0))) {
		lDay -= 365;
		i++;
	}

	date_time->nian = i; //年份
	for(j = 0; j < 12; j++) {
		if((j == 1) && (((i % 4 == 0) && (i % 100 != 0)) || (i % 400 == 0))) {
			iDay = 29;
		} else {
			iDay = DayOfMon[j];
		}
		if(lDay >= iDay) {
			lDay -= iDay;
		} else {
			break;
		}
	}
	date_time->yue = j + 1; //月
	date_time->ri = lDay + 1; //日
	date_time->shi = ((lSec / 3600)) % 24; 		//时
	date_time->fen = (lSec % 3600) / 60;		//分
	date_time->miao = (lSec % 3600) % 60;		//秒
}