Sha256 Algorithm. The SHA hash functions are a set of cryptographic hash functions designed by the National Security Agency (NSA) and published by the NIST as a U.S. Federal Information Processing StANDard. SHA stands for Secure Hash Algorithm
标签： functions hash cryptographic Algorithm
上传时间： 2014-11-09
上传用户：1109003457
This definitive volume contains all the information you need to understand and use SQL and its implementations in accordance with the established SQL99 StANDard
标签： information definitive understand and
上传时间： 2017-09-20
上传用户：tonyshao
The TJA1040 is an advanced high speed CAN transceiver for use in automotive and general industrial applications. It supports the differential bus signal representation described in the international StANDard for in-vehicle high speed CAN applications (ISO11898). CAN (Controller Area Network) is the StANDard protocol for serial in-vehicle bus communication, particularly for Engine Management and Body Multiplexing. The TJA1040 provides a Standby mode, as known from its functional predecessors PCA82C250 and PCA82C251, but with significantly reduced power consumption. Besides the excellent low-power behavior the TJA1040 offers several valuable system improvements. Highlights are the absolute passive bus behavior if the device is unpowered as well as the excellent EMC performance.
标签： CAN
上传时间： 2015-03-23
上传用户：Yuan Lo
此为JavaAPI中文手册，JavaTM 2 Platform StANDard Edition 5.0 API 规范
标签： java
上传时间： 2015-04-28
上传用户：Tinylin
Writing essays and dissertations can be a major concern for overseas students studying at English-medium colleges and universities. Virtually all courses contain a large degree of written assessment and it is essential to ensure that your writing skills meet the necessary StANDard. Academic Writing is a new kind of writing course for all international students who have to write exams or coursework in English. This practical book thoroughly explains the writing process and covers all the key writing skills.
标签： Academic writing
上传时间： 2015-11-13
上传用户：blackbat
IEEE StANDard Verilog® Hardware Description Language
标签： verilog-ieee
上传时间： 2016-05-19
上传用户：assman
MDK-ARM软件为基于Cortex-M、Cortex-R4、ARM7、ARM9处理器设备提供了一个完整的开发环境。 MDK-ARM专为微控制器应用而设计，不仅易学易用，而且功能强大，能够满足大多数苛刻的嵌入式应用。MDK-ARM有四个可用版本，分别是MDK-Lite、MDK-Basic、MDK-StANDard、MDK-Professional。所有版本均提供一个完善的C / C++开发环境，其中MDK-Professional还包含大量的中间库。
上传时间： 2016-07-20
上传用户：lizhenyu4545
StANDard transfer specification (STS) –Physical layer protocol for one-way numeric and magnetic card token carriers .
上传时间： 2017-02-04
上传用户：aarons大叔
The FlexiForce A301 is our smallest StANDard piezoresistive force sensor.
上传时间： 2017-04-13
上传用户：guoggn
/****************temic*********t5557***********************************/ #include <at892051.h> #include <string.h> #include <intrins.h> #include <stdio.h> #define uchar unsigned char #define uint unsigned int #define ulong unsigned long //STC12C2051AD的SFR定义 sfr WDT_CONTR = 0xe1;//stc2051的看门狗?????? /**********全局常量************/ //写卡的命令 #define write_command0 0//写密码 #define write_command1 1//写配置字 #define write_command2 2//密码写数据 #define write_command3 3//唤醒 #define write_command4 4//停止命令 #define TRUE 1 #define FALSE 0 #define OK 0 #define ERROR 255 //读卡的时间参数us #define ts_min 250//270*11.0592/12=249//取近似的整数 #define ts_max 304//330*11.0592/12=304 #define t1_min 73//90*11.0592/12=83:-10调整 #define t1_max 156//180*11.0592/12=166 #define t2_min 184//210*11.0592/12=194 #define t2_max 267//300*11.0592/12=276 //***********不采用中断处理:采用查询的方法读卡时关所有中断****************/ sbit p_U2270B_Standby = P3^5;//p_U2270B_Standby PIN=13 sbit p_U2270B_CFE = P3^3;//p_U2270B_CFE PIN=6 sbit p_U2270B_OutPut = P3^7;//p_U2270B_OutPut PIN=2 sbit wtd_sck = P1^7;//SPI总线 sbit wtd_si = P1^3; sbit wtd_so = P1^2; sbit iic_data = P1^2;//lcd IIC sbit iic_clk = P1^7; sbit led_light = P1^6;//测试绿灯 sbit led_light1 = P1^5;//测试红灯 sbit led_light_ok = P1^1;//读卡成功标志 sbit fengmingqi = P1^5; /***********全局变量************************************/ uchar data Nkey_a[4] = {0xA0, 0xA1, 0xA2, 0xA3};//初始密码 //uchar idata card_snr[4]; //配置字 uchar data bankdata[28] = {1,2,3,4,5,6,7,1,2,3,4,5,6,7,1,2,3,4,5,6,7,1,2,3,4,5,6,7}; //存储卡上用户数据(1-7)7*4=28 uchar data cominceptbuff[6] = {1,2,3,4,5,6};//串口接收数组ram uchar command; //第一个命令 uchar command1;// //uint temp; uchar j,i; uchar myaddr = 8; //uchar ywqz_count,time_count; //ywqz jishu: uchar bdata DATA; sbit BIT0 = DATA^0; sbit BIT1 = DATA^1; sbit BIT2 = DATA^2; sbit BIT3 = DATA^3; sbit BIT4 = DATA^4; sbit BIT5 = DATA^5; sbit BIT6 = DATA^6; sbit BIT7 = DATA^7; uchar bdata DATA1; sbit BIT10 = DATA1^0; sbit BIT11 = DATA1^1; sbit BIT12 = DATA1^2; sbit BIT13 = DATA1^3; sbit BIT14 = DATA1^4; sbit BIT15 = DATA1^5; sbit BIT16 = DATA1^6; sbit BIT17 = DATA1^7; bit i_CurrentLevel;//i_CurrentLevel BIT 00H(Saves current level of OutPut pin of U2270B) bit timer1_end; bit read_ok = 0; //缓存定时值,因用同一个定时器 union HLint { uint W; struct { uchar H;uchar L; } B; };//union HLint idata a union HLint data a; //缓存定时值,因用同一个定时器 union HLint0 { uint W; struct { uchar H; uchar L; } B; };//union HLint idata a union HLint0 data b; /**********************函数原型*****************/ //读写操作 void f_readcard(void);//全部读出1~7 AOR唤醒 void f_writecard(uchar x);//根据命令写不同的内容和操作 void f_clearpassword(void);//清除密码 void f_changepassword(void);//修改密码 //功能子函数 void write_password(uchar data *data p);//写初始密码或数据 void write_block(uchar x,uchar data *data p);//不能用通用指针 void write_bit(bit x);//写位 /*子函数区*****************************************************/ void delay_2(uint x) //延时,时间x*10us@12mhz,最小20us@12mhz { x--; x--; while(x) { _nop_(); _nop_(); x--; } _nop_();//WDT_CONTR=0X3C;不能频繁的复位 _nop_(); } ///////////////////////////////////////////////////////////////////// void initial(void) { SCON = 0x50; //串口方式1,允许接收 //SCON =0x50; //01010000B:10位异步收发,波特率可变,SM2=0不用接收到有效停止位才RI=1, //REN=1允许接收 TMOD = 0x21; //定时器1 定时方式2(8位),定时器0 定时方式1(16位) TCON = 0x40; //设定时器1 允许开始计时(IT1=1) TH1 = 0xfD; //FB 18.432MHz 9600 波特率 TL1 = 0xfD; //fd 11.0592 9600 IE = 0X90; //EA=ES=1 TR1 = 1; //启动定时器 WDT_CONTR = 0x3c;//使能看门狗 p_U2270B_Standby = 0;//单电源 PCON = 0x00; IP = 0x10;//uart you xian XXXPS PT1 PX1 PT0 PX0 led_light1 = 1; led_light = 0; p_U2270B_OutPut = 1; } /************************************************/ void f_readcard()//读卡 { EA = 0;//全关,防止影响跳变的定时器计时 WDT_CONTR = 0X3C;//喂狗 p_U2270B_CFE = 1;// delay_2(232); //>2.5ms /* // aor 用唤醒功能来防碰撞 p_U2270B_CFE = 0; delay_2(18);//start gap>150us write_bit(1);//10=操作码读0页 write_bit(0); write_password(&bankdata[24]);//密码block7 p_U2270B_CFE =1 ;// delay_2(516);//编程及确认时间5.6ms */ WDT_CONTR = 0X3C;//喂狗 led_light = 0; b.W = 0; while(!(read_ok == 1)) { //while(p_U2270B_OutPut);//等一个稳定的低电平?超时判断? while(!p_U2270B_OutPut);//等待上升沿的到来同步信号检测1 TR0 = 1; //deng xia jiang while(p_U2270B_OutPut);//等待下降沿 TR0 = 0; a.B.H = TH0; a.B.L = TL0; TH0 = TL0 = 0; TR0 = 1;//定时器晚启动10个周期 //同步头 if((324 < a.W) && (a.W < 353)) ;//检测同步信号1 else { TR0 = 0; TH0 = TL0 = 0; goto read_error; } //等待上升沿 while(!p_U2270B_OutPut); TR0 = 0; a.B.H = TH0; a.B.L = TL0; TH0 = TL0 = 0; TR0 = 1;//b.N1<<=8; if(a.B.L < 195);//0.5p else { TR0 = 0; TH0 = TL0 = 0; goto read_error; } //读0~7块的数据 for(j = 0;j < 28;j++) { //uchar i; for(i = 0;i < 16;i++)//8个位 { //等待下降沿的到来 while(p_U2270B_OutPut); TR0 = 0; a.B.H = TH0; a.B.L = TL0; TH0 = TL0 = 0; TR0 = 1; if(t2_max < a.W/*)&&(a.W < t2_max)*/)//1P { b.W >>= 2;//先左移再赋值 b.B.L += 0xc0; i++; } else if(t1_min < a.B.L/*)&&(a.B.L < t1_max)*/)//0.5p { b.W >>= 1; b.B.L += 0x80; } else { TR0 = 0; TH0 = TL0 = 0; goto read_error; } i++; while(!p_U2270B_OutPut);//上升 TR0 = 0; a.B.H = TH0; a.B.L = TL0; TH0 = TL0 = 0; TR0 = 1; if(t2_min < a.W/*)&&(a.W < t2_max)*/)//1P { b.W >>= 2; i++; } else if(t1_min < a.B.L/*a.W)&&(a.B.L < t1_max)*/)//0.5P //else if(!(a.W==0)) { b.W >>= 1; //temp+=0x00; //led_light1=0;led_light=1;delay_2(40000); } else { TR0 = 0; TH0 = TL0 = 0; goto read_error; } i++; } //取出奇位 DATA = b.B.L; BIT13 = BIT7; BIT12 = BIT5; BIT11 = BIT3; BIT10 = BIT1; DATA = b.B.H; BIT17 = BIT7; BIT16 = BIT5; BIT15 = BIT3; BIT14 = BIT1; bankdata[j] = DATA1; } read_ok = 1;//读卡完成了 read_error: _nop_(); } } /***************************************************/ void f_writecard(uchar x)//写卡 { p_U2270B_CFE = 1; delay_2(232); //>2.5ms //psw=0 StANDard write if (x == write_command0)//写密码:初始化密码 { uchar i; uchar data *data p; p = cominceptbuff; p_U2270B_CFE = 0; delay_2(31);//start gap>330us write_bit(1);//写操作码1:10 write_bit(0);//写操作码0 write_bit(0);//写锁定位0 for(i = 0;i < 35;i++) { write_bit(1);//写数据位1 } p_U2270B_CFE = 1; led_light1 = 0; led_light = 1; delay_2(40000);//测试使用 //write_block(cominceptbuff[4],p); p_U2270B_CFE = 1; bankdata[20] = cominceptbuff[0];//密码存入 bankdata[21] = cominceptbuff[1]; bankdata[22] = cominceptbuff[2]; bankdata[23] = cominceptbuff[3]; } else if (x == write_command1)//配置卡参数:初始化 { uchar data *data p; p = cominceptbuff; write_bit(1);//写操作码1:10 write_bit(0);//写操作码0 write_bit(0);//写锁定位0 write_block(cominceptbuff[4],p); p_U2270B_CFE= 1; } //psw=1 pssword mode else if(x == write_command2) //密码写数据 { uchar data*data p; p = &bankdata[24]; write_bit(1);//写操作码1:10 write_bit(0);//写操作码0 write_password(p);//发口令 write_bit(0);//写锁定位0 p = cominceptbuff; write_block(cominceptbuff[4],p);//写数据 } else if(x == write_command3)//aor //唤醒 { //cominceptbuff[1]操作码10 X xxxxxB uchar data *data p; p = cominceptbuff; write_bit(1);//10 write_bit(0); write_password(p);//密码 p_U2270B_CFE = 1;//此时数据不停的循环传出 } else //停止操作码 { write_bit(1);//11 write_bit(1); p_U2270B_CFE = 1; } p_U2270B_CFE = 1; delay_2(560);//5.6ms } /************************************/ void f_clearpassword()//清除密码 { uchar data *data p; uchar i,x; p = &bankdata[24];//原密码 p_U2270B_CFE = 0; delay_2(18);//start gap>150us //操作码10:10xxxxxxB write_bit(1); write_bit(0); for(x = 0;x < 4;x++)//发原密码 { DATA = *(p++); for(i = 0;i < 8;i++) { write_bit(BIT0); DATA >>= 1; } } write_bit(0);//锁定位0:0 p = &cominceptbuff[0]; write_block(0x00,p);//写新配置参数:pwd=0 //密码无效:即清除密码 DATA = 0x00;//停止操作码00000000B for(i = 0;i < 2;i++) { write_bit(BIT7); DATA <<= 1; } p_U2270B_CFE = 1; delay_2(560);//5.6ms } /*********************************/ void f_changepassword()//修改密码 { uchar data *data p; uchar i,x,addr; addr = 0x07;//block7 p = &Nkey_a[0];//原密码 DATA = 0x80;//操作码10:10xxxxxxB for(i = 0;i < 2;i++) { write_bit(BIT7); DATA <<= 1; } for(x = 0;x < 4;x++)//发原密码 { DATA = *(p++); for(i = 0;i < 8;i++) { write_bit(BIT7); DATA >>= 1; } } write_bit(0);//锁定位0:0 p = &cominceptbuff[0]; write_block(0x07,p);//写新密码 p_U2270B_CFE = 1; bankdata[24] = cominceptbuff[0];//密码存入 bankdata[25] = cominceptbuff[1]; bankdata[26] = cominceptbuff[2]; bankdata[27] = cominceptbuff[3]; DATA = 0x00;//停止操作码00000000B for(i = 0;i < 2;i++) { write_bit(BIT7); DATA <<= 1; } p_U2270B_CFE = 1; delay_2(560);//5.6ms } /***************************子函数***********************************/ void write_bit(bit x)//写一位 { if(x) { p_U2270B_CFE = 1; delay_2(32);//448*11.0592/120=42延时448us p_U2270B_CFE = 0; delay_2(28);//280*11.0592/120=26写1 } else { p_U2270B_CFE = 1; delay_2(92);//192*11.0592/120=18 p_U2270B_CFE = 0; delay_2(28);//280*11.0592/120=26写0 } } /*******************写一个block*******************/ void write_block(uchar addr,uchar data *data p) { uchar i,j; for(i = 0;i < 4;i++)//block0数据 { DATA = *(p++); for(j = 0;j < 8;j++) { write_bit(BIT0); DATA >>= 1; } } DATA = addr <<= 5;//0地址 for(i = 0;i < 3;i++) { write_bit(BIT7); DATA <<= 1; } } /*************************************************/ void write_password(uchar data *data p) { uchar i,j; for(i = 0;i < 4;i++)// { DATA = *(p++); for(j = 0;j < 8;j++) { write_bit(BIT0); DATA >>= 1; } } } /*************************************************/ void main() { initial(); TI = RI = 0; ES = 1; EA = 1; delay_2(28); //f_readcard(); while(1) { f_readcard(); //读卡 f_writecard(command1); //写卡 f_clearpassword(); //清除密码 f_changepassword(); //修改密码 } }
标签： 12345
上传时间： 2017-10-20
上传用户：my_lcs
