翻译接龙第二期：Using the Touch Screen Controller

有奖翻译第二期同第一期（http://www.freescaleic.org/bbs/index_Article_21623.html），我们会选出3名优秀译者，给予积分以及购物券奖励。请大家认领积极参与

 

获奖名单公布：

chriscbn 、霜筠、moonstar1214

 

后续内容见15楼

 

Using the Touch Screen Controller on the MCF5227x

 

1、The need for graphical user interfaces in industrial and consumer applications is steadily increasing. For instance, LCDs are now on appliances such as washers,dryers, refrigerators, and stoves, allowing enhanced human control. Security and HVAC control systems are other examples of applications that require advanced graphical display interfaces to enable human control of the various system functions. Along with the LCD, the use of touch screens is also increasing. To address this need, Freescale is introducing a family of cost-effective and highly integrated ColdFire microprocessors that feature an integrated LCD controller and an integrated touch screen controller module.

2、The MCF5227x family of ColdFire microprocessors includes an analog signal processor (ASP) module. The module includes an analog-to-digital converter (ADC) and digital logic to automatically manage the I/O switching and timing required for interfacing to a touch screen. As a touch screen controller, it supports resistive 4-wire, 5-wire, 7-wire, and 8-wire touch screens. When the ASP module is not used as a touch screen controller, it can be used as a multi-channel 12-bit general-purpose ADC. Also, if there are channels that aren’t used for touch screen functionality, they can be used as general-purpose ADC inputs.

3、This application note describes how resistive touch screens work and how the ASP module can be used to interface to different types of touch screens. To simplify discussion, this document discusses using the ASP module as a touch screen only. There is no discussion of using the ASP module as a general-purpose ADC or using a mix of touch screen and ADC channels.

1 Touch Screen Overview

4、There are a number of touch screen technologies available today. Three of the most common touch screen technologies are resistive, capacitive, and surface acoustic wave (SAW). Of these, resistive touch screens are generally the least expensive but also provide good reliability, durability, and accuracy.

5、Resistive touch screens need only pressure to get a reading. This means that any type of input device can be used to create the touch — finger, stylus, gloved finger, etc. By comparison, capacitive touch screens require a conductive touch device, so they must be used with a finger touch or a special conductive stylus.Surface acoustic wave touch screens rely on the absorption of sound waves to detect a touch so a finger or gloved finger will work. However, a small, hard stylus doesn’t work, so SAW touch screens usually require a special soft-tipped stylus.

6、Resistive touch screens do have some disadvantages. One of the primary disadvantages is that the touch screen uses multiple layers, and the coatings on the layers can reduce light transmission and create some color distortion of the underlying LCD image. The optical quality for resistive touch screens can vary from manufacturer to manufacturer. For applications where resolution and brightness of the display are important, it might be worth the extra investment to purchase a resistive touch screen with better light transmission characteristics, or even move to a different type of touch screen technology.

7、The ASP module on the MCF5227x supports resistive type touch screens. Modes of operation are available for the commonly used interfaces — 4-wire, 5-wire, 7-wire, and 8-wire. The following sections discuss how the different types of resistive touch screens work, along with their advantages and disadvantages

 

未完待续！ 

又有翻译活动了，偶来参加下，请各位大侠指教。
1、The need for graphical user interfaces in industrial and consumer applications is steadily increasing. For instance, LCDs are now on appliances such as washers,dryers, refrigerators, and stoves, allowing enhanced human control. Security and HVAC control systems are other examples of applications that require advanced graphical display interfaces to enable human control of the various system functions. Along with the LCD, the use of touch screens is also increasing. To address this need, Freescale is introducing a family of cost-effective and highly integrated ColdFire microprocessors that feature an integrated LCD controller and an integrated touch screen controller module.

目前，对于图像用户界面的需求正在工业和消费应用领域不断增加。举例来说，除去传统的电视显示，LCD已经开始在洗衣机、烘干机、冰箱以及炉具上出现，以此来增加用户管控效果。安全和HVAC控制系统的应用是另外一个事例，它需要更加先进的图形显示界面来提升用户控制的各种系统功能。与LCD的大规模应用一样，触摸屏的使用也在逐渐风靡。为了满足目前的巨大需求，飞思卡尔公司推出了集成LCD控制器和触摸屏控制模块的低成本、高集成度ColdFire微处理器系列。

嘿嘿

2、The MCF5227x family of ColdFire microprocessors includes an analog signal processor (ASP) module. The module includes an analog-to-digital converter (ADC) and digital logic to automatically manage the I/O switching and timing required for interfacing to a touch screen. As a touch screen controller, it supports resistive 4-wire, 5-wire, 7-wire, and 8-wire touch screens. When the ASP module is not used as a touch screen controller, it can be used as a multi-channel 12-bit general-purpose ADC. Also, if there are channels that aren’t used for touch screen functionality, they can be used as general-purpose ADC inputs.

CoidFire微处理器MCF5227x系列包括一个模拟信号处理器模块(ASP) 。这个模块由一个模拟—数字信号转换器（ADC）以及自动开关和定时进行输入/输出的数字逻辑组成，后者是触摸屏界面所必需的。作为一个触摸屏控制器，它支持四线、五线、七线和八线电阻式触摸屏。当这个模拟信号处理器不被用作触摸屏控制器时，它可以被用作多通道十二位通用模数转换器。而且如果有通道不被用作触摸屏功能，他们也可以用来作为通用模数转换器输入设备。

3、This application note describes how resistive touch screens work and how the ASP module can be used to interface to different types of touch screens. To simplify discussion, this document discusses using the ASP module as a touch screen only. There is no discussion of using the ASP module as a general-purpose ADC or using a mix of touch screen and ADC channels.

说明书描述了电阻式触摸屏是怎样工作的以及模拟信号处理器模块怎样被用来连接不同型号的触摸屏。为了简化讨论，这个文件只探讨作为触摸屏使用的模拟信号处理器模块。不涉及对使用通用模数转换器和同时使用触摸屏以及模数转换器通道的讨论。

4、There are a number of touch screen technologies available today. Three of the most common touch screen technologies are resistive, capacitive, and surface acoustic wave (SAW). Of these, resistive touch screens are generally the least expensive but also provide good reliability, durability, and accuracy.
现在有许多的触摸屏技术，三种最常见的触摸屏技术是电阻式，电容式和表面声波触摸屏。其中，电容式触摸屏是相对而言最便宜的而且提供了可靠，持续和准确的服务。
5、Resistive touch screens need only pressure to get a reading. This means that any type of input device can be used to create the touch — finger, stylus, gloved finger, etc. By comparison, capacitive touch screens require a conductive touch device, so they must be used with a finger touch or a special conductive stylus.Surface acoustic wave touch screens rely on the absorption of sound waves to detect a touch so a finger or gloved finger will work. However, a small, hard stylus doesn’t work, so SAW touch screens usually require a special soft-tipped stylus.

电阻式触摸屏只需要压力就能阅读信息，这意味着任何可输入的设备都可以用来触摸--手指，指示笔
带着手套的手指，等等，相比较而言，电容式触摸屏需要有传导性的设施，因此他们必须配合着手指的触摸或者特殊的有传导性的指示笔。表面声波触摸屏依靠对声波的吸收来对触摸做出反应，所以带不带手套的手指都可以对它产生作用。不过，细小的，坚硬的指示笔并不起作用，所以表面声波触摸屏（SAW）通常需要配备一种特殊的软头的指示笔。

moonstar1214, 有段字好小，调调

6、Resistive touch screens do have some disadvantages. One of the primary disadvantages is that the touch screen uses multiple layers, and the coatings on the layers can reduce light transmission and create some color distortion of the underlying LCD image. The optical quality for resistive touch screens can vary from manufacturer to manufacturer. For applications where resolution and brightness of the display are important, it might be worth the extra investment to purchase a resistive touch screen with better light transmission characteristics, or even move to a different type of touch screen technology.
    电阻式触摸屏存在一些先天不足。其中，最为主要的是采用了多层复合的结构，这样覆于各层上的薄膜就会降低光的透射率并造成触摸屏之下的LCD图像的色彩失真。电阻式触摸屏的光学性能是因制造厂商的不同而异的。对分辨率和亮度比较在意的兄弟，您花上点儿钱再买上一块电阻式触摸屏（盖在你那没触摸的LCD上）其实是比较划算的：你会因此获得更好的光透射率。或者干脆你就别用电阻式的了，换别的吧。

 

嘿嘿，好像一般产品名称都不直接翻译。CoidFire微处理器，翻译成冷火微处理器感觉怪怪滴

还有这句话偶觉得应该这样翻译啦：欢迎拍砖

 

ColdFire微处理器MCF5227x系列包括一个模拟信号处理器（ASP）模块，该模块则是由一个模数转换器（ADC）以及触摸屏界面所需时钟、I/O转换自动控制数字逻辑模块组成。作为一个触摸屏控制器，它支持4线、5线、7线和8线电阻式触摸屏。当不需要模拟信号处理器模块担任触摸屏控制器时，它可以被用作多通道12位通用模数转换器。而且，在支持触摸屏功能时，如果有些通道没被使用，他还能充当通用模数转换器输入设备。

 

 

原帖由霜筠于2008-05-14 13:07发表:
3、This application note describes how resistive touch screens work and how the ASP module can be used to interface to different types of touch screens. To simplify discussion, this document discusses using the ASP module as a touch screen only. There is no discussion of using the ASP module as a general-purpose ADC or using a mix of touch screen and ADC channels.

说明书描述了电阻式触摸屏是怎样工作的以及模数转换器模块怎样被用来连接不同型号的触摸屏。为了简化讨论，这个文件只探讨作为触摸屏使用的模数转换器模块。不涉及对使用通用模数转换器和同时使用触摸屏以及模数转换器通道的讨论。

下面是偶翻译滴：

这篇应用笔记讲述了电阻式触摸屏工作原理以及ASP模块在不同类型触摸屏界面下的使用情况。为了简化讨论，本文只探论了ASP模块在触摸屏中使用的一种情况，没有涉及其在通用模数转换器以及在触摸屏、ADC通道双重情况下的应用

 

感谢 blueant 

 

        温馨提示霜筠，要注意前后文的一致，前面翻译的ASP是模拟信号处理器，后文中全变成模数转换器（ADC），这是两个不同的东东啦！

 

 

 

chriscbn 翻译的非常不错，赞一个！

7、The ASP module on the MCF5227x supports resistive type touch screens. Modes of operation are available for the commonly used interfaces — 4-wire, 5-wire, 7-wire, and 8-wire. The following sections discuss how the different types of resistive touch screens work, along with their advantages and disadvantages

MCF5227x系列ASP模块支持电阻式触摸屏，与常用4线、5线、7线以及8线使用界面兼容。下文就着重介绍不同类型电阻式触摸屏工作原理以及它们各自的优缺点。

 

MCF5227x 不是freescale的产品吗？ 

多谢scarletnet MM的夸奖！

1.1 How 4-Wire Resistive Touch Screens Work
8、 A 4-wire touch screen is made from two layers, each with a resistive coating. There is a separation between the two layers. The bottom layer is rigid, but the top one is flexible. Both layers have bus bars placed perpendicular to each other. A voltage is applied to the bus bars on both sides of a layer and the resistive coating creates a voltage gradient across the plane. The basic idea is to create a voltage divider. Detecting the voltage at the division point (the touch point) allows for calculating the relative position of the touch point with respect to the two rails.
1.1 4线电阻式触摸屏如何工作？
4线触摸屏是由2层构成的，每层都有电阻涂层，将两层分割开来。其中底层为刚性，上层为柔性。

 

1.1       4线电阻式触摸屏工作原理

4线触摸屏是由2层构成，每层都有电阻涂层将其分割开来。其中底层为刚性，上层为柔性。两层都有相互垂直的母线，一旦层面上产生电压，电阻涂层就会在平板上产生电压差。基本思路是附加一个分压器，检测区分点（接触点）电压，通过两层之间的电压差别计算接触点相对位置。

 

谢谢scarletnet和blueant 两位的提醒

 

MCF5227x 就是freescale的产品

 

 

这段好像还没有翻译完啦！…………

A 4-wire touch screen is made from two layers, each with a resistive coating. There is a separation between the two layers. The bottom layer is rigid, but the top one is flexible. Both layers have bus bars placed perpendicular to each other. A voltage is applied to the bus bars on both sides of a layer and the resistive coating creates a voltage gradient across the plane. The basic idea is to create a voltage divider. Detecting the voltage at the division point (the touch point) allows for calculating the relative position of the touch point with respect to the two rails.
4线触摸屏由2层构成，每层均有电阻涂层，将两层分割开来。其中底层为刚性，上层为柔性。每层的母线互相垂直。当两层母线开始加压，电阻涂层就会通过平面产生电压差。基本思路是建立一个分压器，检测分割点（接触点）电压 ，通过二维数据计算触摸屏上相应触摸点。

9、To get the coordinates for a single point, two measurements are needed. First a voltage is applied across the x-axis plane, and the contacts for the y-axis plane are allowed to float. The resistive coating on the touch screen creates a voltage gradient across the plane. If the top layer is pressed, it flexes and makes contact with the bottom layer. The y-axis plane now has a voltage equal to the voltage on the x-axis plane at the point of contact. The voltage on the y-axis plane can be measured and used to obtain the x-coordinate. The process is repeated again to get the y-coordinate. This time the voltage is applied across they-axis plane and the x-axis plane is allowed to float. Then the x-axis voltage is measured and used to calculate the y-coordinate location.
要计算出坐标点需要两个测量前提。首先是电压应用于X轴平面，Y轴平面允许移动，触摸屏电阻涂层能够产生电压梯度差。如果上层接受到压力弯曲与底层产生接触，Y平面上就会产生与X平面接触点相同的电压。通过计算y平面上电压就可以计算出用户在X面上的坐标点。同样的过程在获得Y坐标。此时，电压应用与整个平面，X面允许自由浮动，同时通过测量X轴电压计算出Y坐标位置。

lemon tree,lemon tree,I love lemon tree!