SHORT
41364
BGA/25+
原装认证有意请来电或QQ洽谈
SHORT
41364
BGA/25+
原装认证有意请来电或QQ洽谈
SHORT
521010
NR/2017+
-
SHORT
5000
BGA/23+
优势产品大量库存原装现货
SHORT
8000
BGA/22+
原装现货,配单能手
SHORT
60701
BGA/24+
深圳原装现货,可看货可提供拍照
SHORT
8700
BGA/2021+
原装现货
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3000
BGA/N/A
原装正品热卖,价格优势
SHORT
48000
BGA/24+
原装现货,可开专票,提供账期服务
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6608
BGA/2024+
现货假一罚万只做原装现货
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5000
BGA/24+
优势渠道现货,提供一站式配单服务
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41101
BGA/-
大量现货,提供一站式配单服务
SHORT
65286
-/21+
全新原装现货,长期供应,免费送样
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23412
BGA/23+
提供一站式配单服务
SHORT
28800
BGA/22+
原装现货,提供配单服务
SHORT
521010
NR/2017+
-
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2000
BGA/2024+
原厂原装现货库存支持当天发货
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5000
BGA/2019+
原装欢迎询价
SHORT
15800
BGA/24+
旋尔只做进口原装,假一赔十...
SHORT
4
-/14+
原装现货热卖
中,等待语音压缩线程取出并处理。录音函数形式如下: dx_reciottdata (activechdev,&chinfo [activechdev].iott,&tptrec[0],&xpbvox,mode); 该函数的输入参数的含义如下: int chdev 语音通道的设备句柄 dx_iott *iott 指向语音数据目的地的指针 dv_tpt *tptp 指向终止参数块的指针 dx_xpb *xpbp 指向i/o传输块的指针 unsigned short mode 录音所采取的方式 iott是一种dx_iott类型的数据结构,该数据结构中的io_type可取值io_dev和io_mem,分别用于指定语音数据存入文件还是存入缓冲区中。io_type的另一类取值可为io_cont,io_link或dx_iott,用于指定语音数据目的地的结构。如果io_type取值io_dev,则io_fhandle的值应为一个文件的句柄;如果io_type取值io_mem,则io_fhandle的值应为0,此时,io_bufp指向存放语音数据的缓冲区的起始地
e(d,a,t)*(a)=(*(a)<<8)^(t)[(*(a)>>8)^(d)]; #define crcupdate16(d,a,t)*(a)=(*(a)>>8^(t)[(*(a)^(d))&0x00ff]) /* 以上两个宏可以代替函数crcupdate和crcrevupdate */ #include #include #include /* 函数crchware是传统的crc算法,其返回值即crc值 */ unsigned short crchware(data,genpoly,accum) unsigned short data;/* 输入的数据 */ unsigned short genpoly;/* crc除数 */ unsigned short accum;/* crc累加器值 */ { static int i; data<<=8; for(i=8;i>0;i--) { if((data^accum)&0x8000) accum=
* trans_start记录最后一次成功发送的时间。可以用来确定硬件是否工作正常。*/ unsigned long trans_start; /* time (in jiffies) of last tx */ unsigned long last_rx; /* time of last rx */ /* flags里面有很多内容,定义在include/linux/if.h里。*/ unsigned short flags; /* interface flags (a la bsd) */ unsigned short family; /* address family id (af_inet) */ unsigned short metric; /* routing metric (not used) */ unsigned short mtu; /
译器工作特点的基础上来实现代码优化。代码的优化方法较多,本文针对函数优化方法进行阐述。 1 函数局部变量的数据类型 局部变量包括函数内局部变量、函数参数、函数返回值。由于arm数据操作都是32位,即使数据本身只需要8位或16位,对于这三类局部变量也应尽可能使用32位的数据类型int或long,以提高代码执行效率。下面以简单求和函数为例进行分析。 函数add1计算包含10个字的数组array的累加和,add2与add1功能相同,只是将函数add1的参数array类型改为16位的short,函数内局部变量i类型改为8位的char,sum改为16位的short。add1、add2的c源代码如下: int add1(int *array){ unsigned int i; int sum=0; for(i=0;i<10;i++) sum=sum+array[i]; return sum; } short add2(short *array){ char i; short sum=0; for(i=0;i<1
d { private int recbufsize; private audiorecord audiorecord; public recordthread(audiorecord audiorecord, int recbufsize) { this.audiorecord = audiorecord; this.recbufsize = recbufsize; } public void run() { try { short[] buffer = new short[recbufsize]; audiorecord.startrecording();// 开始录制 while (isrecording) { // 从mic保存数据到缓冲区 int bufferreadresult = audiorecord.read(buffer, 0, recbufsize); short[] tmpbuf = new short[bufferreadresult / ratex]
dividual grayscale clock input. gs, dc, and bc data are accessible via a serial interface port. dc and bc can be programmed via a dedicated serial interface port. the tlc5951 has three error detection circuits for led open detection (lod), led short detection (lsd), and thermal error flag (tef). lod detects a broken or disconnected led while lsd detects a shorted led. tef indicates an over-temperature condition. 2、tps61500 说明:the tps61500 is a monolithic switching regulator with integrate
加1会使其变为0。而实际上,现代32位处理器是不会执行上述的那种8位加法,而是进行32位数值的加法。因此,如果一个unsigned char的本地变量进行加法,编译器必须使用多条指令进行运算以保证加法后的符号扩展。因此,针对各种变量尤其是循环索引的变量,应该尽量多的在可以的地方使用int型变量。 另外,许多嵌入式处理器有16位乘法指令,而缺少32位乘法指令。在这种情况下,32位乘法将被仿效执行,一般情况下都是很慢的。如果数据被执行乘法操作并且计算结果不会超过16位的精度,那么就使用short或者unsigned short变量。 7. 不要用不直接的调用 这是通过包含传递参数的函数指针的调用,因为那会产生不可预知的边际效应(比如修改全局变量),使得优化难以进行。 8. 编写返回数值的函数而不是返回指针的函数 9. 传递变量时使用数值而不是指针或者全局变量 传递大结构的数据时,才使用指针。每个通过数值被传递的结构都应该在函数调用入口处被完全拷贝存储过。 10. 使用变量的地址会使程序性能降低 因为本地变量的地址会引起混淆,这如同全局变量一样。 11. 用c
面下,按“transformer test”对应键,再按“test condition”对应键进入测量参数设定画面。用方向键将光标移至所需设置的项目上,输入测试频率,测试电压等参数,并将所设项目勾选,按“meas/display”键,返回主画面。 7)将测试线接入测试座,再将测试夹子分开一定距离,按“open”键, 再按“single freq”键,最后按“start/trigger”键进行单点开路归零,结束后显示“pass”,按“start/trigger”键退出。将测试线夹子对夹,按“short”键进行单点短路归零(方法同开路归零)。开路短路单频点归零操作完成后,亦可选择进行多频点归零“mult-freq”。也可按“dcr short”键可对直流电阻进行归零。 8)上述归零操作完成后,按“exit”对应键退出,按“meas/dlsplay”键进入主功能画面,再依照6)之方法进入测量参数设定画面,因上面操作已对参数进行了设定,因此可直接按“meas disp”对应键进入测试界面,此时画面显示值为实际测量结果。 9)如须进行设定参数值和实际值进行比较,可在参数设定画面下设定好测
是指在各种操作前,为了安全考虑所应逐一检查的项目。狭义指的是在pbc 业中,客户到现场却对品质进行了解,而逐一稽查的各种项目。 13、continuity 连通性 指电路中(circuits)电流之流通是否顺畅的情形。另有 continuity testing是指对各线路通电情况所进行的测试,即在各线路的两端各找出两点,分别以弹性探针与之做紧迫接触(全板以针床实施之),然后施加指定的电压 (通常为实用电压的两倍 ), 对其进行"连通性试验",也就是俗称的 open/short testing (断短路试验)。 14、coupon,test coupon 板边试样 电路板欲了解其细部品质,尤其是多层板的通孔结构,不能只靠外观检查及电性测试,还须对其结构做进一步的微切片 (microsectioning)显微检查。因此需在板边一处或多处,设置额外的"通孔及线路"图样,做为监视该片板子结构完整性(structure integraty)的解剖切片配合试样 (conformal coupon)。品质特严者,凡当切样不及格时,该片板子也将不能出货
ww.silvertel.com silver(锡欧尔)代理商 公司名:walasey limited-北京 地址:room 521,block a, jinfenghe office building,8 xinjiekouwai street电话:86 010-62053391/62362728传真:+ 86 010-6205339联系人:sales网址://www.walasey.com 公司名:infomart asia pacific pte. ltd. 地址:89, short street#02-17 golden wall centresingapore 188216电话:65 6225-6500传真:65 6225-6005联系人:sales网址://www.jesons.com 公司名:旭捷电子有限公司-北京 地址:中国北京市朝阳区小营路12号亚运花园1号楼15h电话:86-10-84648068#801 传真:010-84629162 联系人:sales网址://www.mitscomponent.com 公司名:旭捷电子有限公司-台
130 khz switching frequency enables small size; very tight led constant current regulation; built-in output constant-current control with primary-side feedback for led driver;. low start-up current (10 μa typical); built-in soft start; built-in short circuit protection and output overvoltage protection; current sense resistor short protection; over-temperature protection; open circuit protection; universal input range from 85 vac to 264 vac; single-fault protection; small input bulk capaci
the circuit uses transformerless supply and no galvanic isolation! figure 1: embedded saver with lamp fixture hardware descriptionfigure 1 shows complete hardware schematic of the night light saver v6.0. the ac line was protected f1, a 1a fuse. any short circuit caused by saver's components will blow the fuse. r1 and c1 limit current to the +5v zener diode, d3. r2 discharges capacitor c1 when power terminal of the circuit was opened. the super capacitor c2,+5v 0.01f filters dc supply. d4 acts as uni
hen adjust p1 to get 6.5v at the output of regulator u6.2. next first adjust p2 to get the 13.1v at the output of regulator u7, make sure transistor t5 is off or temporarily connect the t5 base to ground using test clips.3. now temporarily short the collector of transistor t5 to ground using test clips.3. adjust p3 to get the 12.1v at the output of u7 regulator ic. figure 1: circuit diagram of flash programmer v3.0figure 2 shows the circuit diagram of the interface adapter card required
路类型分类上属于斩波电路。 figure 1. application circuit for 2-cells battery supply figure 2. application circuit for li-ion battery supply typical applications circuit rt9911,pdf datasheet (6 channel dc/dc converters) note : bottom pad is gnd pad, can be short to pin 6 (gnd)。 please remove q2 when use async boost and remove d5 when use sync boost. 来源:qick
assemble by soldering the components to the pads indicated. keep coil, resistor, and capacitor leads as short as possible. the coils should be 3/16" to 1/4" above the board and separate turns by one wire diameter. bend leads to form a little mounting foot for soldering to the circuit board. tuning and power output are affected by the distance between the coil turns, you can make fine adjustments by either spreading or compressing the coil slightly. the area surrounding the pads is ground. c
0x06#define xmodem_nak 0x15#define xmodem_can 0x18#define xmodem_eof 0x1a#define at91c_base_ncs0 0x10000000 //ncs0全部16位访问#define at91c_base_sdram 0x20000000 extern void at91f_dbgu_printk(char *buffer);void delayms(unsigned short time) //ms等级定时,time=1..1000{ unsigned short piv; piv=32768*time/1000; at91c_base_st->st_pimr=piv; while (!(at91c_base_st->st_sr&at91c_st_pits));}unsigned short at91f_crc16(char *ptr, int count) { int crc = 0;
hharm-study-2410-r1 的linux dm9000x.c驱动中低8位反序的问题?dm9000的代码在一开始就#undef outb #undef outw#undef inb #undef inw在重新定义#define swap_hardwareinline void outw(unsigned short value, unsigned long addr){#ifndef swap_hardware unsigned char a,b=0;unsigned short c=data(value); int i,j=7,k=1,m=128;a=c & 0x00ff; for(i=1;i<=4;i++) { b=b|((a&k)<>j); k*=2; m/=2; j--; j--; } *(volatile unsigned shor
输出地址时片选输出怎么不变?我用的是smartarm2200的开发板,在连接lcd(192*64)调试时,按照硬件连接定义地址:#define cwadd1 (*((volatile unsigned short *) 0x83800000)) //写指令代码地址(左)#define cradd1 (*((volatile unsigned short *) 0x83800002)) //读状态字地址(左)#define dwadd1 (*((volatile unsigned short *) 0x83800004)) //写显示数据地址(左)#define dradd1 (*((volatile unsigned short *) 0x83800006)) //读显示数据地址(左)#define cwadd2 (*((volatile unsigned short *) 0x83800008)) //写指令代码地址(中)#define cradd2
高手板帮忙,ads编译时出错编译时提示ansi c forbids bit fieldtype 'unsigned short'union huffquad { struct { unsigned short final : 1; unsigned short bits : 3; unsigned short offset : 12; } ptr; struct { unsigned short final : 1; unsigned short hlen : 3; unsigned short v : 1; unsigned short w : 1; unsigned short x : 1; unsigned short y : 1; } value; unsigned short final : 1;};
oard\flash\flashos.h"#include "board\memorytest.h"int i, j;unsigned char tmp;unsigned char *ptr;unsigned char buf[4*1024];// 检查外部flash, 返回 0 = 没有错误// 非0 = 出错的地址int checkflash (void){ int i, page; unsigned short *ptr1; ptr1 = (unsigned short *)buf; for(i=0; i<2*1024; i++) ptr1[i] = (unsigned short)i; if(erasechip_flash()) return 1; for(page=0; page<512; page++) { programpage_flash(0x81000000+page*4096, 4096, buf);