Difference between revisions of "LCD-HD101"
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[[LCD-HD101/zh|查看中文]] | [[LCD-HD101/zh|查看中文]] | ||
− | == | + | ==Introduction== |
[[File:HD101.png|thumb|]] | [[File:HD101.png|thumb|]] | ||
− | * | + | * The HD101 LCD is a FriendlyARM developed LCD with capacitive touch panel. Its resolution is 1280 x 800. Its backlight is adjustable via FriendlyARM’s one-wire technology. It works with FriendlyARM’s Tiny4412, Super4412, NanoPC-T1, NanoPC-T2, NanoPi 2 and NanoPi 2 Fire under Linux and Android. Its driver is open source. |
− | * | + | * The HD101 has a black ABS bezel with mounting holes making it easily deployed in various situations. |
==Dimensional Diagram== | ==Dimensional Diagram== |
Revision as of 15:25, 28 June 2016
Contents
1 Introduction
- The HD101 LCD is a FriendlyARM developed LCD with capacitive touch panel. Its resolution is 1280 x 800. Its backlight is adjustable via FriendlyARM’s one-wire technology. It works with FriendlyARM’s Tiny4412, Super4412, NanoPC-T1, NanoPC-T2, NanoPi 2 and NanoPi 2 Fire under Linux and Android. Its driver is open source.
- The HD101 has a black ABS bezel with mounting holes making it easily deployed in various situations.
2 Dimensional Diagram
3 Applications
4 Datasheet
5 Schematics
6 Applicable Platforms
Debian Android Linux+Qt NanoPi 2 NanoPi 2 NanoPi M2 NanoPi M2 NanoPi 2 Fire NanoPi 2 Fire NanoPi M3 NanoPi M3 NanoPC T2 NanoPC T2 NanoPC T3 NanoPC T3 Smart4418 Smart4418 Tiny4412 Tiny4412
7 关于一线触摸
- 在大部分的ARM主控板中,我们发现,直接使用CPU自带的ADC转换器并不能很好的支持大尺寸(7寸以上)的四线电阻触摸屏,市面上一般采用更加专业的USB或串口触摸屏扩展模块来解决。为了节省ARM主控芯片的有限资源以及减少外扩,我们专门开发了只使用一个普通GPIO就可以实现专业触摸效果的替代方案,并把它集成到我们的LCD模块驱动板中,我们称之为“一线触摸(1-Wire)”。它的基本原理是,使用一个低成本的MCU连接一个专业的触控芯片(在此我们使用的是ADS7843或兼容芯片),采集并处理四线电阻模拟信号,并把滤波(未校准)后的稳定原始数据通过GPIO送给ARM主控,经我们长期反复测试,即使在19寸这样大的电阻触摸屏上,也可以实现非常精准的触摸效果,不会出现漂移抖动的现象。
- 另外,当今12寸以内的LCD显示屏,大都采用了LED背光,我们顺便也把背光调节部分也交给MCU来处理,并设置了统一的调节数值区间,最后通过“一线触摸”的GPIO传给ARM主控,这样在ARM端就可以非常方便的来设置背光了。
- 与此同时,我们还为我们设计开发的每一款带“一线触摸”的LCD模块设置了编号存储在MCU中,这样通过一线通讯读取到的编号,就可以知道这个LCD模块的具体类型了,也就可以在bootloader和内核中自动匹配相应的LCD驱动参数,以此来实现无需修改任何配置,即插即用带”一线触摸”的LCD模块。
- 在电容触摸LCD模块中,我们则去掉了电阻触控芯片,而保留了背光调节和存储LCD类型编号这2个功能,因此电容触摸通讯依然是标准的I2C接口。
- 需要注意的是,我们实现的“一线触摸”的通讯,和通常所说的单总线接口是不同的。在ARM主控端内部,我们实际采用了一路pwm timer(不是pwm管脚哦)来实现固定的通讯频率(9600Hz),详细请查看驱动源代码。