📄 触摸屏试验--周绪宏.htm
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<H2 class=diaryTitle>触摸屏试验</H2><B>关键词</B>： <A
href="http://tag.bokee.com/tag/ADS7843" target=_blank>ADS7843</A>
<A href="http://tag.bokee.com/tag/´¥ÃþÆÁ" target=_blank>触摸屏</A>
<P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: center"
align=center><B style="mso-bidi-font-weight: normal"><FONT size=3><SPAN
style="FONT-FAMILY: 宋体; mso-hansi-font-family: " Roman?? New ?Times
mso-ascii-font-family: Roman?; Times>触摸屏试验</SPAN><SPAN lang=EN-US>
<P></SPAN></FONT></B></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><B
style="mso-bidi-font-weight: normal"><SPAN lang=EN-US>
<P><FONT face="Times New Roman" size=3></FONT> </P></SPAN></B>
<P></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; mso-outline-level: 1"><FONT
size=3><SPAN lang=EN-US><FONT
face="Times New Roman">XSBase255</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-hansi-font-family: " Roman?? New ?Times
mso-ascii-font-family: Roman?; Times>平台使用的是电阻式的触摸屏，使用的是</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">ADS7843</FONT></SPAN><SPAN
style="FONT-FAMILY: 宋体; mso-hansi-font-family: " Roman?? New ?Times
mso-ascii-font-family: Roman?; Times>控制器。</SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US>
<P><FONT face="Times New Roman" size=3></FONT> </P></SPAN>
<P></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-hansi-font-family: " Roman?? New ?Times
mso-ascii-font-family: Roman?; Times><FONT
size=3>通过编写一测试程序，了解驱动程序与测试程序之间的关系，在测试程序中，我们可以读出触摸屏当前的位置，也可以通过驱动程序设置触摸屏的一些参数等。</FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US>
<P><FONT face="Times New Roman" size=3></FONT> </P></SPAN>
<P></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><FONT size=3><SPAN
style="FONT-FAMILY: 宋体; mso-hansi-font-family: " Roman?? New ?Times
mso-ascii-font-family: Roman?; Times>触摸屏坐标：</SPAN><FONT face="Times New Roman">
</FONT><SPAN style="FONT-FAMILY: 宋体; mso-hansi-font-family: " Roman?? New ?Times
mso-ascii-font-family: Roman?; Times>最左上角</SPAN><SPAN lang=EN-US><FONT
face="Times New Roman">(0, 0)<SPAN style="mso-tab-count: 1">
</SPAN></FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-hansi-font-family: "
Roman?? New ?Times mso-ascii-font-family: Roman?; Times>最右下角</SPAN><SPAN
lang=EN-US><FONT face="Times New Roman">(640, 480)</FONT></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><FONT size=3><SPAN
style="FONT-FAMILY: 宋体; mso-hansi-font-family: " Roman?? New ?Times
mso-ascii-font-family: Roman?; Times>触摸屏设备文件：</SPAN><SPAN lang=EN-US><FONT
face="Times New Roman">/dev/ts<SPAN style="mso-spacerun: yes"> </SPAN>c 11
0</FONT></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><FONT size=3><SPAN
style="FONT-FAMILY: 宋体; mso-hansi-font-family: " Roman?? New ?Times
mso-ascii-font-family: Roman?; Times>触摸屏驱动程序：</SPAN><SPAN lang=EN-US><FONT
face="Times New Roman">/drivers/char/<SPAN
style="mso-spacerun: yes"> </SPAN>ads7843.h<SPAN
style="mso-tab-count: 1"> </SPAN><SPAN
style="mso-tab-count: 1">
</SPAN>ads7843.c</FONT></SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US><SPAN
style="mso-tab-count: 1"><FONT face="Times New Roman"
size=3> </FONT></SPAN></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN
style="FONT-FAMILY: 宋体; mso-hansi-font-family: " Roman?? New ?Times
mso-ascii-font-family: Roman?; Times><FONT
size=3>建议看一下触摸屏驱动程序。</FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US>
<P><FONT face="Times New Roman" size=3></FONT> </P></SPAN>
<P></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US>
<P><FONT face="Times New Roman" size=3></FONT> </P></SPAN>
<P></P>
<P class=MsoNormal style="BACKGROUND: #f3f3f3; MARGIN: 0cm 0cm 0pt"><SPAN
lang=EN-US><FONT face="Times New Roman" size=3>#vi
test_touch_screen.c</FONT></SPAN></P>
<P class=MsoNormal style="BACKGROUND: #f3f3f3; MARGIN: 0cm 0cm 0pt"><SPAN
lang=EN-US><FONT face="Times New Roman" size=3>#include
<stdio.h></FONT></SPAN></P>
<P class=MsoNormal style="BACKGROUND: #f3f3f3; MARGIN: 0cm 0cm 0pt"><SPAN
lang=EN-US><FONT face="Times New Roman" size=3>#include
<stdlib.h></FONT></SPAN></P>
<P class=MsoNormal style="BACKGROUND: #f3f3f3; MARGIN: 0cm 0cm 0pt"><SPAN
lang=EN-US><FONT face="Times New Roman" size=3>#include
<unistd.h></FONT></SPAN></P>
<P class=MsoNormal style="BACKGROUND: #f3f3f3; MARGIN: 0cm 0cm 0pt"><SPAN
lang=EN-US><FONT face="Times New Roman" size=3>#include
<sys/types.h></FONT></SPAN></P>
<P class=MsoNormal style="BACKGROUND: #f3f3f3; MARGIN: 0cm 0cm 0pt"><SPAN
lang=EN-US><FONT face="Times New Roman" size=3>#include
<sys/stat.h></FONT></SPAN></P>
<P class=MsoNormal style="BACKGROUND: #f3f3f3; MARGIN: 0cm 0cm 0pt"><SPAN
lang=EN-US><FONT face="Times New Roman" size=3>#include
<fcntl.h></FONT></SPAN></P>
<P class=MsoNormal style="BACKGROUND: #f3f3f3; MARGIN: 0cm 0cm 0pt"><SPAN
lang=EN-US>
<P><FONT face="Times New Roman" size=3></FONT> </P></SPAN>
<P></P>
<P class=MsoNormal style="BACKGROUND: #f3f3f3; MARGIN: 0cm 0cm 0pt"><SPAN
lang=EN-US><FONT face="Times New Roman" size=3>main(int agrc, char
**argv)</FONT></SPAN></P>
<P class=MsoNormal style="BACKGROUND: #f3f3f3; MARGIN: 0cm 0cm 0pt"><SPAN
lang=EN-US><FONT face="Times New Roman" size=3>{</FONT></SPAN></P>
<P class=MsoNormal style="BACKGROUND: #f3f3f3; MARGIN: 0cm 0cm 0pt"><SPAN
lang=EN-US><FONT size=3><FONT face="Times New Roman"><SPAN
style="mso-tab-count: 1"> </SPAN>int<SPAN
style="mso-tab-count: 2">
</SPAN>fd;</FONT></FONT></SPAN></P>
<P class=MsoNormal style="BACKGROUND: #f3f3f3; MARGIN: 0cm 0cm 0pt"><SPAN
lang=EN-US><FONT size=3><FONT face="Times New Roman"><SPAN
style="mso-tab-count: 1"> </SPAN>unsigned
short<SPAN style="mso-tab-count: 1">
</SPAN>data[4]={0, 0, 0, 0};</FONT></FONT></SPAN></P>
<P class=MsoNormal style="BACKGROUND: #f3f3f3; MARGIN: 0cm 0cm 0pt"><SPAN
lang=EN-US><FONT size=3><FONT face="Times New Roman"><SPAN
style="mso-tab-count: 1"> </SPAN>unsigned
int<SPAN style="mso-tab-count: 1"> </SPAN>select_item,
temp;</FONT></FONT></SPAN></P>
<P class=MsoNormal style="BACKGROUND: #f3f3f3; MARGIN: 0cm 0cm 0pt"><SPAN
lang=EN-US><FONT size=3><FONT face="Times New Roman"><SPAN
style="mso-tab-count: 1"> </SPAN>unsigned
int <SPAN style="mso-tab-count: 1"> </SPAN>max_x, max_y, min_x,
min_y;</FONT></FONT></SPAN></P>
<P class=MsoNormal style="BACKGROUND: #f3f3f3; MARGIN: 0cm 0cm 0pt"><SPAN
lang=EN-US><SPAN style="mso-tab-count: 1"><FONT face="Times New Roman"
size=3> </FONT></SPAN></SPAN></P>
<P class=MsoNormal style="BACKGROUND: #f3f3f3; MARGIN: 0cm 0cm 0pt"><SPAN
lang=EN-US><FONT size=3><FONT face="Times New Roman"><SPAN
style="mso-tab-count: 1"> </SPAN>fd =
open("/dev/ts",<SPAN style="mso-spacerun: yes">
</SPAN>O_RDWR);</FONT></FONT></SPAN></P>
<P class=MsoNormal style="BACKGROUND: #f3f3f3; MARGIN: 0cm 0cm 0pt"><SPAN
lang=EN-US><FONT size=3><FONT face="Times New Roman"><SPAN
style="mso-tab-count: 1"> </SPAN>if (fd ==
-1){</FONT></FONT></SPAN></P>
<P class=MsoNormal style="BACKGROUND: #f3f3f3; MARGIN: 0cm 0cm 0pt"><SPAN
lang=EN-US><FONT size=3><FONT face="Times New Roman"><SPAN
style="mso-tab-count: 2">
</SPAN>printf("/dev/ts file open failed\n");</FONT></FONT></SPAN></P>
<P class=MsoNormal style="BACKGROUND: #f3f3f3; MARGIN: 0cm 0cm 0pt"><SPAN
lang=EN-US><FONT size=3><FONT face="Times New Roman"><SPAN
style="mso-tab-count: 2">
</SPAN>exit(-1);</FONT></FONT></SPAN></P>
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