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

blueant

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

斯嘉丽

原帖由blueant于2008-05-16 16:02发表:
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 usin

 
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！
 
 

斯嘉丽

[quote]原帖由moonstar1214于2008-05-14 16:55发表:
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.

只要有压力，就能够利用电阻式触摸屏来阅读信息，这意味着任何可输入的设备都可以用来产生触摸信号--如：手指，指示笔甚至带手套的手指，等等。相对而言，电容式触摸屏就需要具有传导性的触摸设备，所以，必须通过手指或者特殊传导指示笔。表面声波触摸屏凭借吸收声波来判断触摸反应，所以带不带手套对它的工作没有任何影响。不过，对于细小、坚硬的指示笔除外，因此，表面声波触摸屏（SAW）通常需要配备一种特殊的软头指示笔。
 
稍微修正一下：
 

斯嘉丽

原帖由chriscbn于2008-05-15 22:46发表:
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 scr

 
chriscbn 翻译的非常不错，赞一个！

斯嘉丽

[quote]原帖由scarletnet于2008-05-14 11:47发表:
未完待续
接上文
 
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.

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.
 
1.1.1 Example of 4-Wire Touch Screen Measurement

10、Figure 1 shows an example of how measurements would be taken on a 4-wire touch screen. The first step is to get the x-axis coordinate. To do this X+/XL is biased to 3.3 V, and X–/XR is biased to 0 V. At this point there should be a consistent voltage ramp across the x-axis plane. If the screen is touched in the center, the mid-level voltage of 1.65 V is transferred to the y-axis plane. The Y+/YU and Y–/YD points are floating, so the entire plane should be at 1.65 V. This input voltage is read from the Y+/YU connection and used to determine that the x-axis coordinate of the touch point is at 50% of the screen’s width.

11、The next step is to get the y-axis coordinate. This time Y+/YU is biased to 3.3 V, and Y–/YD is biased to 0 V. This creates the consistent voltage ramp across the y-axis plane. The pressure from the touch creates a contact point between the two planes so that the x-axis plane goes to 1.65 V. The input voltage is read from the X+/XL wire and used to determine that the y-axis coordinate of the touch point is at 50% of the screen’s height.

morebetter

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？ 

moonstar1214

原帖由scarletnet于2008-05-16 16:19发表:
[quote]原帖由moonstar1214于2008-05-14 16:55发表:
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.

只要有压力，就能够利用电阻式触摸屏来阅读信息，这意味着任何可输入的设备都可以用来产生触摸信号--如：手指，指示笔甚至带手套的手指，等等。相对而言，电容式触摸屏就需要具有传导性的触摸设备，所以，必须通过手指或者特殊传导指示笔。表面声波触摸屏凭借吸收声波来判断触摸反应，所以带不带手套对它的工作没有任何影响。不过，对于细小、坚硬的指示笔除外，因此，表面声波触摸屏（SAW）通常需要配备一种特殊的软头指示笔。

稍微修正一下：

谢谢指正！！

chriscbn

原帖由scarletnet于2008-05-16 16:22发表:


chriscbn 翻译的非常不错，赞一个！

多谢scarletnet MM的夸奖！

山东大学南风队

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。
   

霜筠

原帖由scarletnet于2008-05-16 16:07发表:


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！

谢谢scarletnet和blueant 两位的提醒