As you have learnt that sleep( )/usleep()/nanosleep() are not good to delay a process. Timers can provide more accurate time control in applications. In this lab, you will explore POSIX timers and signal programming, experience the timer drift. The primary focus of this lab will be "time". The experiment will show you several methods to measure time in your applications.
標(biāo)簽： nanosleep process Timers learnt
上傳時(shí)間： 2013-12-19
上傳用戶：huyiming139
從時(shí)域分析比較了ofdm和stbc與ofdm結(jié)合的性能差別-from time-domain analysis and comparison of OFDM stbc OFDM combined wi
上傳時(shí)間： 2013-06-05
上傳用戶：caozhizhi
蛇行線(delay tune)1. 前言蛇行線可在Allegro 中藉由elong_by_pick 自動完成.若想以半自動方式則可用
標(biāo)簽： allegro 64008 delay tune
上傳時(shí)間： 2013-06-25
上傳用戶：allen-zhao123
ANALOG INPUT BANDWIDTH is a measure of the frequencyat which the reconstructed output fundamental drops3 dB below its low frequency value for a full scale input. Thetest is performed with fIN equal to 100 kHz plus integer multiplesof fCLK. The input frequency at which the output is −3dB relative to the low frequency input signal is the full powerbandwidth.APERTURE JITTER is the variation in aperture delay fromsample to sample. Aperture jitter shows up as input noise.APERTURE DELAY See Sampling Delay.BOTTOM OFFSET is the difference between the input voltagethat just causes the output code to transition to the firstcode and the negative reference voltage. Bottom Offset isdefined as EOB = VZT–VRB, where VZT is the first code transitioninput voltage and VRB is the lower reference voltage.Note that this is different from the normal Zero Scale Error.CONVERSION LATENCY See PIPELINE DELAY.CONVERSION TIME is the time required for a completemeasurement by an analog-to-digital converter. Since theConversion Time does not include acquisition time, multiplexerset up time, or other elements of a complete conversioncycle, the conversion time may be less than theThroughput Time.DC COMMON-MODE ERROR is a specification which appliesto ADCs with differential inputs. It is the change in theoutput code that occurs when the analog voltages on the twoinputs are changed by an equal amount. It is usually expressed in LSBs.
標(biāo)簽： Converter Defi ADC 轉(zhuǎn)換器
上傳時(shí)間： 2013-11-12
上傳用戶：pans0ul
使用時(shí)鐘PLL的源同步系統(tǒng)時(shí)序分析一）回顧源同步時(shí)序計(jì)算Setup Margin = Min Clock Etch Delay – Max Data Etch Delay – Max Delay Skew – Setup TimeHold Margin = Min Data Etch Delay – Max Clock Etch Delay + Min Delay Skew + Data Rate – Hold Time下面解釋以上公式中各參數(shù)的意義：Etch Delay：與常說的飛行時(shí)間(Flight Time)意義相同，其值并不是從仿真直接得到，而是通過仿真結(jié)果的后處理得來。請看下面圖示：圖一為實(shí)際電路，激勵(lì)源從輸出端，經(jīng)過互連到達(dá)接收端，傳輸延時(shí)如圖示Rmin，Rmax，F(xiàn)min，F(xiàn)max。圖二為對應(yīng)輸出端的測試負(fù)載電路，測試負(fù)載延時(shí)如圖示Rising，F(xiàn)alling。通過這兩組值就可以計(jì)算得到Etch Delay 的最大和最小值。
標(biāo)簽： PLL 時(shí)鐘 同步系統(tǒng) 時(shí)序分析
上傳時(shí)間： 2013-11-05
上傳用戶：VRMMO
目錄： 1. Character Type Functions － 字符類型函數(shù) 2. Standard C Input/Output Functions － 標(biāo)準(zhǔn)輸入輸出函數(shù) 3. Standard Library Functions － 標(biāo)準(zhǔn)庫和內(nèi)存分配函數(shù) 4. Mathematical Functions － 數(shù)學(xué)函數(shù) 5. String Functions － 字符串函數(shù) 6. BCD Conversion Functions － BCD 轉(zhuǎn)換函數(shù) 7. Memory Access Functions － 存儲器訪問函數(shù) 8. Delay Functions － 延時(shí)函數(shù) 9. LCD Functions － LCD函數(shù) 10. LCD Functions for displays with 4x40 characters － 4×40 字符型LCD函數(shù) 11. LCD Functions for displays connected in 8 bit memory mapped mode －以8 位外部存儲 器模式接口的LCD顯示函數(shù) 12. I2C Bus Functions － I2C 總線函數(shù) 13. National Semiconductor LM75 Temperature Sensor Functions － LM75 溫度傳感器函數(shù) 14. Dallas Semiconductor DS1621 Thermometer/Thermostat Functions － DS1621 溫度計(jì)函 數(shù) 15. Philips PCF8563 Real Time Clock Functions － PCF8563 實(shí)時(shí)時(shí)鐘函數(shù) 16. Philips PCF8583 Real Time Clock Functions － PCF8583 實(shí)時(shí)時(shí)鐘函數(shù) 17. Dallas Semiconductor DS1302 Real Time Clock Functions － DS1302 實(shí)時(shí)時(shí)鐘函數(shù) 18. Dallas Semiconductor DS1307 Real Time Clock Functions － DS1307 實(shí)時(shí)時(shí)鐘函數(shù) 19. 1 Wire Protocol Functions － 單線通訊協(xié)議函數(shù) 20. Dallas Semiconductor DS1820/DS1822 Temperature Sensors Functions － DS1820/1822 溫度傳感器函數(shù) 21. SPI Functions － SPI 函數(shù) 22. Power Management Functions － 電源管理函數(shù) 23. Gray Code Conversion Functions － 格雷碼轉(zhuǎn)換函數(shù)
上傳時(shí)間： 2013-10-22
上傳用戶：歸海惜雪
飛機(jī)電網(wǎng)故障時(shí)，機(jī)載電氣盒必須在延遲時(shí)間內(nèi)切斷電網(wǎng)，保護(hù)機(jī)載設(shè)備。采用AT89S52設(shè)計(jì)的電氣盒測試儀能夠測試電氣盒保護(hù)功能，測量延遲時(shí)間。實(shí)際應(yīng)用結(jié)果表明，該測試儀具有測量準(zhǔn)確、可靠性高、成本低等優(yōu)點(diǎn)。 Abstract: The helicopter-electrical-box must shut off the helicopter power，protect the equipments of the helicopter when the helicopter power is failed.The tester for the helicopter-electrical-box based on AT89S52is used for testing the protect-ing function and measuring the delay time.Application results show this tester has some advantages,such as accurate mea-surement,high dependability,economical cost etc.
上傳時(shí)間： 2014-12-27
上傳用戶：786334970
HT47R20A-1時(shí)基(Time Base)使用介紹 HT47 系列單片機(jī)的時(shí)基可提供一個(gè)周期性超時(shí)時(shí)間周期以產(chǎn)生規(guī)則性的內(nèi)部中斷。時(shí)基的時(shí)鐘來源可由掩膜選擇設(shè)定為WDT 時(shí)鐘、RTC 時(shí)鐘或指令時(shí)鐘（系統(tǒng)時(shí)鐘/4）；其超時(shí)時(shí)間范圍可由掩膜選擇設(shè)定為“時(shí)鐘來源”/212~“時(shí)鐘來源”/215。如果時(shí)基發(fā)生超時(shí)現(xiàn)象，則其對應(yīng)的中斷請求標(biāo)志（TBF）會被置位，如果中斷允許，則產(chǎn)生一個(gè)中斷服務(wù)到08H 的地址。
上傳時(shí)間： 2013-11-15
上傳用戶：13925096126
//芯片資料請到www.elecfans.com查找 //DS1820 C51 子程序//這里以11.0592M晶體為例，不同的晶體速度可能需要調(diào)整延時(shí)的時(shí)間//sbit DQ =P2^1;//根據(jù)實(shí)際情況定義端口 typedef unsigned char byte;typedef unsigned int word; //延時(shí)void delay(word useconds){ for(;useconds>0;useconds--);} //復(fù)位byte ow_reset(void){ byte presence; DQ = 0; //pull DQ line low delay(29); // leave it low for 480us DQ = 1; // allow line to return high delay(3); // wait for presence presence = DQ; // get presence signal delay(25); // wait for end of timeslot return(presence); // presence signal returned} // 0=presence, 1 = no part //從 1-wire 總線上讀取一個(gè)字節(jié)byte read_byte(void){ byte i; byte value = 0; for (i=8;i>0;i--) { value>>=1; DQ = 0; // pull DQ low to start timeslot DQ = 1; // then return high delay(1); //for (i=0; i<3; i++); if(DQ)value|=0x80; delay(6); // wait for rest of timeslot } return(value);} //向 1-WIRE 總線上寫一個(gè)字節(jié)void write_byte(char val){ byte i; for (i=8; i>0; i--) // writes byte, one bit at a time { DQ = 0; // pull DQ low to start timeslot DQ = val&0x01; delay(5); // hold value for remainder of timeslot DQ = 1; val=val/2; } delay(5);} //讀取溫度char Read_Temperature(void){ union{ byte c[2]; int x; }temp; ow_reset(); write_byte(0xCC); // Skip ROM write_byte(0xBE); // Read Scratch Pad temp.c[1]=read_byte(); temp.c[0]=read_byte(); ow_reset(); write_byte(0xCC); //Skip ROM write_byte(0x44); // Start Conversion return temp.x/2;}
上傳時(shí)間： 2013-11-03
上傳用戶：hongmo
16kb/s Low Delay CELP 算法
上傳時(shí)間： 2015-01-03
上傳用戶：huangld
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