📄 程序示例-串口(uart).htm
字号:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<!-- saved from url=(0045)http://drew.nease.net/mypage/example/UART.htm -->
<HTML><HEAD><TITLE>程序示例-串口(UART)</TITLE>
<META http-equiv=Content-Type content="text/html; charset=gb2312">
<META content="MSHTML 6.00.2800.1106" name=GENERATOR></HEAD>
<BODY background=程序示例-串口(UART).files/background.gif>
<P>>><BIG><BIG><A name=returntop></A></BIG><A
href="http://drew.nease.net/">Drew的主页</A></BIG>----><BIG><BIG><A
name=returntop></A></BIG><A
href="http://drew.nease.net/mypage/sourcecode.htm">程序示例</A></BIG>---->串口</P>
<DIV align=center>
<CENTER>
<TABLE borderColor=#88deea height=23 cellSpacing=1 borderColorDark=#88deea
width=754 bgColor=#ffffff borderColorLight=#88deea
background=程序示例-串口(UART).files/bg1.gif border=1>
<TBODY>
<TR>
<TD align=middle width=83 height=1>
<P align=center><A href="http://drew.nease.net/"><BIG>主页</BIG></A></P></TD>
<TD align=middle width=83 height=1>
<P align=center><A href="http://drew.nease.net/mypage/VxWorks.htm"><FONT
lang=ZH-CN face=System>VxWorks</FONT></A></P></TD>
<TD align=middle width=84 height=1>
<P align=center><A href="http://drew.nease.net/processor/arm.htm"><FONT
lang=ZH-CN face=System>ARM</FONT></A></P></TD>
<TD align=middle width=84 height=1>
<P align=center><A href="http://drew.nease.net/processor/mpc860.htm"><FONT
lang=ZH-CN face=System>PowerPC</FONT></A></P></TD>
<TD align=middle width=84 height=1>
<P align=center><A href="http://drew.nease.net/mypage/driver.htm"><FONT
lang=ZH-CN face=System>硬件驱动</FONT></A></P></TD>
<TD align=middle width=84 height=1>
<P align=center><A href="http://drew.nease.net/mypage/network.htm"><FONT
lang=ZH-CN face=System>网络协议</FONT></A></P></TD>
<TD align=middle width=84 height=1>
<P align=center><A
href="http://drew.nease.net/mypage/sourcecode.htm"><FONT lang=ZH-CN
face=System>程序示例</FONT></A></P></TD>
<TD align=middle width=84 height=1><A href="http://www.embhelp.com/bbs"
target=_blank><FONT face=System color=#8000ff>技术论坛</FONT></A></TD>
<TD align=middle width=84 height=1>
<P align=center><A href="http://www.embhelp.com/download"><FONT lang=ZH-CN
face=System>下载</FONT></A></P></TD></TR></TBODY></TABLE></CENTER></DIV>
<P align=center> </P>
<P align=center><FONT
color=#0000ff><BIG><BIG><BIG>串口示例</BIG></BIG></BIG></FONT></P>
<P align=center> </P>
<BLOCKQUOTE>
<BLOCKQUOTE>
<P>//****************************************************************************<BR>//<BR><STRONG>//
下面这些函数是使能串口 UART,并从串口发送接收数据,不同的硬件串口,程//
序都是类似的,只要改一下相应的硬件参数即可<BR></STRONG>//<BR>//****************************************************************************<BR><BR><BR>//****************************************************************************<BR>//<BR>//
UARTEnable
设置串口UART,并使能<BR>//<BR>//****************************************************************************<BR>long<BR>UARTEnable(long
lPort, long lDataRate, long lDataBits, long lStopBits,<BR>long lParity, long
lEvenParity)<BR>{<BR>unsigned char *pucPtr = (unsigned char
*)HwBaseAddress; <STRONG>//硬件的基地址</STRONG><BR>long
lRates[12] = { 115200, 76800, 57600, 38400, 28800, 19200, 14400,
9600,<BR>4800, 2400, 1200, 110 };
<STRONG>//串口波特率</STRONG><BR>long lDivisors[12] = { 1, 2, 3, 5, 7, 11, 15,
23, 47, 95, 191, 2094 };<BR>long lIdx, lConfig;<BR><BR><BR>//<BR><STRONG>//
赋波特率值<BR></STRONG>//<BR>for(lIdx = 0; lIdx < 12;
lIdx++)<BR>{<BR>if(lRates[lIdx] ==
lDataRate)<BR>{<BR>break;<BR>}<BR>}<BR>if(lIdx ==
12)<BR>{<BR>return(0);<BR>}<BR>lConfig = lDivisors[lIdx];<BR><BR>//<BR>//
<STRONG>设置有效的数据位宽度</STRONG><BR>//<BR>switch(lDataBits)<BR>{<BR>case
5:<BR>{<BR>lConfig |= HwUartControlDataLength5;<BR>break;<BR>}<BR><BR>case
6:<BR>{<BR>lConfig |= HwUartControlDataLength6;<BR>break;<BR>}<BR><BR>case
7:<BR>{<BR>lConfig |= HwUartControlDataLength7;<BR>break;<BR>}<BR><BR>case
8:<BR>{<BR>lConfig |=
HwUartControlDataLength8;<BR>break;<BR>}<BR><BR>default:<BR>{<BR>return(0);<BR>}<BR>}<BR><BR>//<BR><STRONG>//
设置停止位个数<BR></STRONG>//<BR>if(lStopBits == 2)<BR>{<BR>lConfig |=
HwUartControlTwoStopBits;<BR>}<BR>else if(lStopBits !=
1)<BR>{<BR>return(0);<BR>}<BR><BR>//<BR><STRONG>//
设置奇偶位校验<BR></STRONG>//<BR>if(lParity)<BR>{<BR>lConfig |=
HwUartControlParityEnable;<BR><BR>//<BR><STRONG>//
偶数位<BR></STRONG>//<BR>if(lEvenParity)<BR>{<BR>//<BR><STRONG>// 改变奇数位为偶数位
(默认是奇数位).<BR></STRONG>//<BR>lConfig |=
HwUartControlParityEven;<BR>}<BR>}<BR><BR>//<BR><STRONG>// 设置,使能
UART.<BR></STRONG>//<BR><BR>//<BR><STRONG>// 关闭 RTS.<BR></STRONG>//<BR>//
pucPtr[HwPortB] &= ~HwPortBRTS;<BR><BR>//<BR><STRONG>// 打开
UART.<BR></STRONG>//<BR>*((unsigned long *)(pucPtr + HwControl)) |=
HwControlUartEnable;<BR><BR>//<BR><STRONG>// 设置
UART.<BR></STRONG>//<BR>*((unsigned long *)(pucPtr + HwUartControl))
=<BR>lConfig |
HwUartControlFifoEnable;<BR><BR>}<BR><BR><BR>//****************************************************************************<BR>//<BR><STRONG>//
UARTDisable 关闭
UART.<BR></STRONG>//<BR>//****************************************************************************<BR>void<BR>UARTDisable(long
lPort)<BR>{<BR>unsigned char * volatile pucPtr = (unsigned char
*)HwBaseAddress;<BR><BR><BR>//<BR>//
如果UART已经关闭,返回<BR>//<BR>if(!lPort1Enabled)<BR>{<BR>return;<BR>}<BR><BR>//<BR><STRONG>//
检查传送数据的 FIFO 是否为空,若不为空,循环等待.<BR></STRONG>//<BR>while(*((unsigned long
*)(pucPtr + HwStatus)) &
HwStatusUartTxBusy)<BR>{<BR>}<BR>//<BR><STRONG>// 关闭
UART.<BR></STRONG>//<BR>*((unsigned long *)(pucPtr + HwControl)) &=
~HwControlUartEnable;<BR>//<BR><STRONG>// 标记 UART 为关
<BR></STRONG>//<BR>lPort1Enabled =
0;<BR>}<BR>}<BR><BR>//****************************************************************************<BR>//<BR><STRONG>//
UARTSendChar 发送一个字符到串口
UART.<BR></STRONG>//<BR>//****************************************************************************<BR>void<BR>UARTSendChar(long
lPort, char cChar)<BR>{<BR>unsigned char * volatile pucPtr = (unsigned char
*)HwBaseAddress;<BR><BR>//<BR><STRONG>// 循环等待直到传送数据的UART FIFO
为空.<BR></STRONG>//<BR>while(*((unsigned long *)(pucPtr + HwStatus)) &
HwStatusUartTxFifoFull)<BR>{<BR>}<BR>//<BR><STRONG>// 写字符到串口
UART.<BR></STRONG>//<BR>pucPtr[HwUartData] =
cChar;<BR>}<BR><BR><BR>//****************************************************************************<BR>//<BR><STRONG>//
UARTReceiveChar 从串口 UART
接收字符<BR></STRONG>//<BR>//****************************************************************************<BR>char<BR>UARTReceiveChar(long
lPort)<BR>{<BR>unsigned char * volatile pucPtr = (unsigned char
*)HwBaseAddress;<BR>//<BR><STRONG>// 循环等待直到接收数据的UART FIFO
内有数据</STRONG><BR>//<BR>while(*((unsigned long *)(pucPtr + HwStatus))
&<BR>HwStatusUartRxFifoEmpty)<BR>{<BR>}<BR>//<BR><STRONG>// 从串口 UART
读出数据,并返回<BR></STRONG>//<BR>return(pucPtr[HwUartData]);<BR><BR>}<BR><BR>//****************************************************************************<BR>//<BR><STRONG>//
UARTCharReady
判断是否在串口有数据等待接收<BR></STRONG>//<BR>//****************************************************************************<BR>long<BR>UARTCharReady(long
lPort)<BR>{<BR>unsigned char * volatile pucPtr = (unsigned char
*)HwBaseAddress;<BR><BR>//<BR><STRONG>// 检查是否有数据在UART FIFO
等待<BR></STRONG>//<BR>if(*((unsigned long *)(pucPtr + HwStatus)) &
HwStatusUartRxFifoEmpty)<BR>{<BR>//<BR><STRONG>// 没有数据,返回
0<BR></STRONG>//<BR>return(0);<BR>}<BR><BR>//<BR><STRONG>// 有数据,返回
1<BR></STRONG>//<BR>return(1);<BR><BR>}<BR></P></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -