📄 tl16c752 串口扩展芯片驱动源代码.htm
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<td width="65%"><STRONG>TL16C752 串口扩展芯片驱动源代码</STRONG></td>
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<td class=main_ArticleTitle style="WORD-BREAK: break-all" colSpan=2 height=50>TL16C752 串口扩展芯片驱动源代码</td>
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<td class=Article_tdbgall colSpan=2>作者：61IC 文章来源：本站原创 点击数：<script language='javascript' src='/Article/GetHits.asp?ArticleID=11115'></script> 更新时间：2007-1-22 <A title=收藏的网页将被永久地保存到新浪ViVi收藏夹http://vivi.sina.com.cn href="javascript:d=document;t=d.selection?(d.selection.type!='None'?d.selection.createRange().text:''):(d.getSelection?d.getSelection():'');void(vivi=window.open('http://vivi.sina.com.cn/collect/icollect.php?pid=2008&title='+escape(d.title)+'&url='+escape(d.location.href)+'&desc='+escape(t),'vivi','scrollbars=no,width=480,height=480,left=75,top=20,status=no,resizable=yes'));vivi.focus();"><IMG src="/images/vivi_coop1.gif" align=absMiddle border=0></A></td>
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<P>#include "uart.h"</P>
<P>/***************************************************************************/<BR>/* ======== UART_rset ======== */<BR>/* Set a UART register,设置寄存器 */<BR>/***************************************************************************/<BR>void UART_rset(Int16 regnum,Int16 regval)<BR>{<BR> Int16 regindex, lcr;<BR> <BR> /* Register index is determined by lower 3 bits and the target UART */<BR> <BR> //regindex = regnum & 0x7;<BR>// if (hUart == 1)<BR>// regindex += 8;<BR> /*是否为高位的寄存器*/<BR> /* If regnum between 0x08 and 0x0F, set bit 7 of LCR to access register */<BR> //if ((regnum & 0x18) == 0x8)<BR> if((regnum >= 0x10) && (regnum <= 0x1e))<BR> {<BR> lcr = rget(TL_UART_LCR);<BR> waitusec(1);<BR> rset(TL_UART_LCR, lcr | 0x80);<BR> waitusec(1);<BR> rset(regnum, regval);<BR> waitusec(1);<BR> rset(TL_UART_LCR, lcr);<BR> waitusec(1);<BR> }<BR> else<BR> {<BR> <BR> rset(regnum, regval);<BR> waitusec(1);<BR> }<BR>}</P>
<P>/**********************************************************************/<BR>/* ======== UART_rget ======== */<BR>/* Get the value of a UART register,读出寄存器的值 */<BR>/**********************************************************************/<BR>Int16 UART_rget(Int16 regnum)<BR>{<BR> Int16 regindex, returnval, lcr;<BR> <BR> /* Register index is determined by lower 3 bits and the target UART */<BR> //regindex = regnum & 0x7;<BR>// if (hUart == 1)<BR>// regindex += 8;<BR> <BR> /* If regnum between 0x08 and 0x0F, set bit 7 of LCR to access register */<BR> //if ((regnum & 0x18) == 0x8)<BR> if((regnum >= 0x10) && (regnum <= 0x1e))<BR> {<BR> lcr = rget(TL_UART_LCR);<BR> rset(TL_UART_LCR, lcr | 0x80);<BR> returnval = rget(regnum);<BR> rset(TL_UART_LCR, lcr);<BR> }<BR> else<BR> {<BR> returnval = rget(regnum);<BR> }<BR> <BR> return returnval;<BR>}</P>
<P>/**************************************************************************/<BR>/* ======== UART_open ======== */<BR>/* Initialize UART and return handle */<BR>/* 描述：打开相应的串口，并进行相应的配置 */<BR>/* 输入参数： */<BR>/* devid: 选择UART的通路 */<BR>/* baudrate: 选择正确的波待率 */<BR>/* config: 其它配置其它的参数组 */<BR>/**************************************************************************/<BR>void UART_open(Int16 baudrate,UART_Config *config)<BR>{<BR>// UART_Handle hUart;<BR> //Int16 dl;<BR> Int8 dl,test;<BR> /* Assign handle */<BR>// hUart = devid;<BR> <BR> /* Set registers based on config structure */</P>
<P> /*设置MCR*/<BR> UART_rset(TL_UART_MCR,config -> regs[3]);<BR> //test = UART_rget(TL_UART_MCR);<BR> /*将EFR寄存器的第4位关闭*/<BR> dl = UART_rget(TL_UART_EFR);<BR> UART_rset(TL_UART_EFR, dl & 0xEF);<BR> //test = UART_rget(TL_UART_EFR);<BR> <BR> /*设置串口的MCR*/<BR> UART_rset(TL_UART_MCR, config -> regs[3]);<BR> //test = UART_rget(TL_UART_MCR);<BR> <BR> /*设置串口的IER*/<BR> UART_rset(TL_UART_IER, config -> regs[0]);<BR> //test = UART_rget(TL_UART_IER);<BR> /*设置串口的FCR*/<BR> UART_rset(TL_UART_FCR, config -> regs[1]);<BR> //test = UART_rget(TL_UART_FCR); <BR> /*设置串口的LCR*/<BR> UART_rset(TL_UART_LCR, config -> regs[2]);<BR> //test = UART_rget(TL_UART_LCR);</P>
<P> /* Set up baud divisor clock，设置波待率 */<BR> dl = UART_rget(TL_UART_MCR);<BR> if((dl & 0x80)==0x80)<BR> {<BR> baudrate = (baudrate/4); <BR> }<BR> //UART_rset(TL_UART_DLL, baudrate & 0xff);<BR> UART_rset(TL_UART_DLL, 0x50);<BR> dl = UART_rget(TL_UART_DLL);<BR> //UART_rset(TL_UART_DLH, (baudrate >> 8) & 0xff);<BR> UART_rset(TL_UART_DLH, 0x00);<BR> dl = UART_rget(TL_UART_DLH);<BR> /* Clear any outstanding receive characters，清空接收寄存器 */<BR> UART_rget(TL_UART_RBR);<BR> <BR>// return hUart;<BR>}</P>
<P>/*********************************************************************/<BR>/* ======== UART_getChar ======== */<BR>/* Get one character of data from the UART,读取数据 */<BR>/*********************************************************************/<BR>Int16 UART_getChar(void)<BR>{<BR> Int16 status;<BR> <BR> while(1)<BR> {<BR> status = UART_rget(TL_UART_LSR);<BR> if ((status & 1) != 0) // DR<BR> break;<BR> }<BR> <BR> return <BR> UART_rget(TL_UART_RBR);<BR>}</P>
<P>/*********************************************************************/<BR>/* ======== UART_putChar ======== */<BR>/* Send one character of data to the UART,发送一个数据 */<BR>/*********************************************************************/<BR>void UART_putChar(Uint16 data)<BR>{<BR> Int16 status;<BR> <BR> while(1)<BR> {<BR> status = UART_rget(TL_UART_LSR);<BR> if ((status & 0x20) != 0) // THRE<BR> break;<BR> }<BR>// SEEDDM642_waitusec(3); <BR> UART_rset(TL_UART_THR, data);</P>
<P>}</P>
<P>void UART_puts(const char *s)<BR>{<BR> while (*s) {<BR> UART_putChar(*s++);<BR> }<BR>}</P>
<P>/* Spin in a delay loop for delay iterations */<BR>void wait(Uint32 delay)<BR>{<BR> volatile Uint32 i, n;<BR> <BR> n = 0;<BR> for (i = 0; i < delay; i++)<BR> {<BR> n = n + 1;<BR> }<BR>}</P>
<P>/* Spin in a delay loop for delay microseconds */<BR>void waitusec(Uint32 delay)<BR>{<BR> wait(delay * 21);<BR>}</P>
<P>Uint8 rget(Int16 regnum)<BR>{<BR> Uint8 *pdata;<BR> <BR> /* Return lower 8 bits of register */<BR> pdata = (Uint8 *)(UART_BASE + regnum);<BR> return (*pdata & 0xff);<BR>}</P>
<P>void rset(Int16 regnum, Uint8 regval)<BR>{<BR> Uint8 *pdata;<BR> <BR> /* Write lower 8 bits of register */<BR> pdata = (Uint8 *)(UART_BASE + regnum);<BR> *pdata = (regval & 0xff);<BR>}<BR></P>
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