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基于FPGA的DS18B20控制程序设计及其Verilog实现.docx
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基于FPGA的DS18B20控制程序设计及其Verilog实现.docx
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traffic management front line, all police always keep has high of spirit State, Strong impetus to the work carried out. There is insufficient: there is a "hard and soft". Degree is not enough attention to party building under the new situation, there is emphasis on the operational light, heavy forms of light effects of party building issues. Second, the measures are not effective. Grasp party construction innovation is not strong in particular, measures and methods also are used to the old experience, old practices, effectiveness needs to be further strengthened. Third, "three lessons" fail to adhere to party organization carried out infrequently. Xiao Zhao station branch of good practice: first, strengthening education. "Three Suns" education as an opportunity to take the leading top party lectures, seminars, self-study, exchanging experiences and other forms of police leaders at all levels of the Organization important speech, happening around the Constitution and corruption case, police
and party members to seriously record study notes, writing experience, ... And attention to micro-party lecture, requires checking, improve yourself, ensure that study results. Second is to strengthen the leadership responsibilities. Secretary of the party branch as honest first person, conscientiously implement the "four person" requirements, adhere to "important deployment in person, major issues personally important cases, coordination of key links in person, personally supervising the" party members always set strict demands on themselves, play an exemplary role. Three is to strengthen the services for the people. Warm reception all who do the people, reflected in record crowds in every issue, and make the patient explanation, continuously improved service quality. Combination of "one village, one police officer", and organizing the police carefully Mo Pai all unstable factors that may affect stability, resolve contradictions and disputes in a timely manner, and civilian police with
daily visits, issuing safety information leaflets, collection site personnel, promoting community harmony. There is insufficient: a rich branch team of party affairs knowledge is not enough, enough familiarity with the procedural terms, to a certain extent, restrict the work carried out. Second, regular ideological education is not enough, the police know timely and accurate enough. Third, meticulous management level needs to be improved, regularization of police awareness is not strong enough, daily habit is not conscious. This year yilai, Council is units branch to "three strict three real" topic education for mainline, to service center, and construction team for focus, insisted thought party and system rule party phase combined, solid implement implementation full strictly rule party requirements, party construction further specification, and members police quality constantly upgrade, and party innovation force constantly strengthening, party service implementation force obviously
improved, made has significantly results. Debriefings of the General Assembly of 3 units in the problems in the party building work in other units also exist to varying degrees and hope that other units through debriefing of the party, learn from experience, to address the issue, extrapolate, careful analysis of rectification, promoting the sustained and healthy development of the party building. Now, to further strengthen the party construction work of public security organs stressed five points throughout the County. First, ideology, political
responsibility and historical mission of the party since the 18, XI made a series of important remarks, General Secretary, the party put forward many new ideas, new arguments and new requirements, is the essence of promoting grass-roots party building work followed. We have to further study and understanding, consciously take responsibility. One is to grasp party building "three questions" of new requirements. Learning education practice, General Secretary of the party's mass line summary presented party building "three questions". That is: "If party committees and party committees of various departments (party) have concentrate on grasping party building? is it Party Committee Secretary of the Party Committee of departments (party) Secretary became Secretary of strictly administering the party? is it at all levels of party committees of various departments (party) members perform in charge of strictly administering the party in the field?" General Secretary presented party
building "three questions", pointed to the key, and enlightening, three-sided mirror placed before you, and let you take a photo, take a look at, think about it, knows the results; three papers before us, and clearly judge us whether they fulfilled their respective responsibilities in the party building. The party "three questions", urged that police officers ... An organ is a Communist Party member of the disciplinary forces, party members accounted for the vast majority of civilian police, Council, the leading cadres and backbone of the units were basically members, authority and responsibility are relatively concentrated, in terms of party-building, be sure to clear responsibility, responsibility, accountability, or grasping party building is an empty word. Third, to clear "three catch" new initiatives. Learn General Secretary stressed that catch a responsibility system for party building must be caught, catch accountability had to catch the person responsible, and catch those responsible had to catch
the first responsible person. Why is debriefing of party branch Secretary of the units, made by the General Secretary is to implement "three catch" requirement. Take the primary responsibility of the party who took the key. Second, full implementation of ideological party construction tasks, tasks into practice theories, XI Jinping summarizes Congress General Secretary at the national practice of mass education of ideological party construction in the new period is defined on tasks and requirements, in order to strengthen the party's construction of the target orientation and path. First, we must strengthen the theoretical study. Current urgent task is to fully understand the great significance of studying and implementing the spirit 18 session, police organization party members by focusing on learning, self-study, special counselling and other forms of serious in-depth study and adhere to the first step, deep layer, grasp the spirit of the plenary session, do anything he learned to think,
learn, learn to use them. Secondly, we should strengthen party spirit tempering. Adhere to the Constitution. Through group learning, the Party Secretary said party lectures and other forms of learning, and understanding the party spirit of party Constitution, lead units of the Council, the branch and the consciousness of all party members and police set up the party. Learn advanced. Vigorously carry forward the spirit of Jiao Yulu, Yang Shuicai spirit, seriously study the advanced deeds of Comrade Yan Zhenchang, deep fine according
基于 FPGA 的 DS18B20 控制程序设计及其 Verilog 实现
一,总体介绍
DS18B20 是一个 1-wire 总线,12bit 的数字温度传感器,其详细的参数这里不做具体的介绍,
只讨论其基于 Verilog 的控制程序的设计。
实际上,对 DS18B20 的控制,主要是实现 1-wire 总线的初始化,读,写等操作,然后再根
据 DS18B20 的控制要求,实现对其控制的 verilog 逻辑。
在 1-Wire 总线上,有一个 master,可以有 1 个或者多个 slave。而对于 FPGA+DS18B20 的温
度测试设计来讲,需要在 FPGA 上实现一个 1-Wire 总线的 master。 DS18B20 作为 1-wire 总
线的 slave 设备存在,可以有一个或者多个,不过为了简化程序,例程里假定只存在一个
DS18B2020。
1-Wire 总线的操作形式上相对简单,但操作本身相对却又比较复杂。用 Verilog 做控制程
序设计时,可以采用多层次嵌套的状态机来实现。
二,FPGA + DS18B20 的硬件设计
硬件的设计非常简单,只需要将 DS18B20 的 DQ 与 FPGA 的一个 IO 连接,并加 4.7K 左右的上
拉电阻就可以了。VDD 和 VPU 可以为 3.0~5.0V。这里我们参照 FPGA 本身的 IO 电压,选择
3.3V。
另外要注意的一点是,由于 DQ 的数据是双向的,所以 FPGA 的该 IO 要设定为 inout 类型。
三,1-Wire 总线的基本操作及 Verilog 实现。
根据 1-Wire 总线的特点,可以把 1-Wire 总线的操作归结为初始化,单 bit 读操作,单 bit
写操作等最基础的几种。下面分别是几种基本操作的介绍和 verilog 实现。由于 DS18B20 的
时序操作的最小单位基本上是 1us,所以在该设计中,全部采用 1MHz 的时钟。
1. 初始化
初始化实际上就是 1-wire 总线上的 Reset 操作。由 master 发出一定长度的初始化信号。
Slave 看到该初始化信号后,在一定时间内发出规定长度的响应信号,然后初始化操作就结
束了。下图是 DS18B20 的 datasheet 上给出的初始化的时序要求图示。
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