常说I2C需求加上拉电阻，符文访游却不知道为什么需求加上拉电阻？第一是I2C自身的协议决议，空闲时两线均坚持高电平状况，可以完成线与功用。

一根信号线上，工房经过电阻衔接一个固定的高电平VCC，信号线初始、空闲时一向坚持高电平状况，称为上拉电阻。通常在规范形式100Khz，龙之合灌电流不超越3mA，VOL不超越0.4V，若上拉电阻至3.3V，上拉电阻阻值约大于1k。

导读I2C总线在产品规划中被广泛运用，制造支撑虽然其结构简略，但常常产生上拉电阻规划不合理的问题。常说I2C需求加上拉电阻，人采却不知道为什么需求加上拉电阻？第一是I2C自身的协议决议，空闲时两线均坚持高电平状况，可以完成线与功用。针对I2C体系，同性在上拉电压的30%至70%时来丈量上升时刻和下降时刻，总线电容100pF，总线最大上升时刻300ns

#includebflb_dac.h#includebflb_mtimer.h#includeboard.h#includebflb_gpio.hstructbflb_device_s*dac;voidMy_dac_gpio_init(){structbflb_device_s*gpio;gpio=bflb_device_get_by_name(gpio);/*DAC_CHA*/bflb_gpio_init(gpio,GPIO_PIN_3,GPIO_ANALOG|GPIO_SMT_EN|GPIO_DRV_0);}uint16_tSIN_LIST[]={500,506,513,519,525,531,538,544,550,556,563,569,575,581,587,594,600,606,612,618,624,630,636,642,648,654,660,666,672,678,684,690,696,701,707,713,718,724,730,735,741,746,752,757,762,768,773,778,784,789,794,799,804,809,814,819,823,828,833,838,842,847,851,856,860,864,869,873,877,881,885,889,893,897,901,904,908,912,915,919,922,925,929,932,935,938,941,944,947,950,952,955,958,960,962,965,967,969,971,973,975,977,979,981,983,984,986,987,989,990,991,992,993,994,995,996,997,997,998,999,999,999,1000,1000,1000,1000,1000,1000,1000,999,999,999,998,998,997,996,995,994,993,992,991,990,989,987,986,984,983,981,979,978,976,974,972,970,967,965,963,960,958,955,953,950,947,944,941,938,935,932,929,926,922,919,916,912,908,905,901,897,893,890,886,882,878,873,869,865,861,856,852,847,843,838,833,829,824,819,814,809,804,799,794,789,784,779,774,768,763,758,752,747,741,736,730,725,719,714,708,702,696,691,685,679,673,667,661,655,649,643,637,631,625,619,613,607,601,594,588,582,576,570,563,557,551,545,538,532,526,520,513,507,501,495,488,482,476,469,463,457,451,444,438,432,426,420,413,407,401,395,389,383,376,370,364,358,352,346,340,334,329,323,317,311,305,299,294,288,282,277,271,265,260,254,249,244,238,233,228,222,217,212,207,202,197,192,187,182,177,172,168,163,158,154,149,145,141,136,132,128,124,119,115,111,107,104,100,96,92,89,85,82,78,75,72,69,65,62,59,56,54,51,48,45,43,40,38,36,33,31,29,27,25,23,21,19,18,16,14,13,12,10,9,8,7,6,5,4,3,3,2,2,1,1,0,0,0,0,0,0,0,1,1,1,2,2,3,4,5,5,6,8,9,10,11,12,14,15,17,19,20,22,24,26,28,30,32,35,37,39,42,44,47,50,52,55,58,61,64,67,71,74,77,81,84,87,91,95,98,102,106,110,114,118,122,126,130,135,139,143,148,152,157,161,166,171,175,180,185,190,195,200,205,210,215,220,226,231,236,242,247,252,258,263,269,274,280,286,291,297,303,309,315,320,326,332,338,344,350,356,362,368,374,380,386,392,399,405,411,417,423,430,436,442,448,455,461,467,473,480,486,492};//输出正弦波的电压值数组intmain(void){board_init();My_dac_gpio_init();dac=bflb_device_get_by_name(dac);/*512K/16=32K*/bflb_dac_init(dac,DAC_CLK_DIV_16);//16分频bflb_dac_channel_enable(dac,DAC_CHANNEL_A);//挑选通道A，婚姻对应GPIO3printf(DACStartrn);while(1){for(uint16_ti=0;i。符文访游voidbflb_dac_channel_enable(structbflb_device_s*dev,uint8_tch);bflb_dac_channel_disable阐明:dac通道封闭

此外，工房《诛仙国际》保留了经典的百⼈PVP混战玩法，玩家需求与队友协作，利⽤环境和机关对立其他团队。

阿⾥云为完美国际游戏供给了核算、龙之合存储、龙之合网络、安全、数据库等从IaaS到PaaS的全⽅⾯技能⽀持和服务，助⼒《诛仙国际》安稳、安全地承载海量玩家一起在线。新航站楼是在动身厅旧址上重建的，制造支撑彻底完结了升级换代，旅客在值机、安检、登机等环节都会有到全新体会。

张昊表明，人采在广州新机场建成之前，人采作为短期改进需求，佛山机场仅需过渡型的航站楼，惯例形式建机场需求3-5年，而佛山机场项目从工厂预制件到现场吊装，全体用时大半年，其间吊装用时一个多月。新机场规划引进两高铁一城际一快线四条轨道交通，同性佛山将借广州第二机场的春风，迎来西向开展的重要交通纽带。

12月26日11时许，婚姻由北京大兴机场飞往佛山的我国联合航空有限公司（以下简称中联航）KN5867航班平稳下降，佛山机场新航站楼迎来第一批进港旅客。在不少网络视频中，符文访游这儿被描绘为全国最精约的机场最低沉机场只需一把U型锁就能关上大门。

(责任编辑：王艺翔)