收集中.......
串口示例
//****************************************************************************
//
// 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
//
//****************************************************************************
//****************************************************************************
//
// UARTEnable 设置串口UART,并使能
//
//****************************************************************************
long
UARTEnable(long lPort, long lDataRate, long lDataBits, long lStopBits,
long lParity, long lEvenParity)
{
unsigned char *pucPtr = (unsigned char *)HwBaseAddress; //硬件的基地址
long lRates[12] = { 115200, 76800, 57600, 38400, 28800, 19200, 14400, 9600,
4800, 2400, 1200, 110 }; //串口波特率
long lDivisors[12] = { 1, 2, 3, 5, 7, 11, 15, 23, 47, 95, 191, 2094 };
long lIdx, lConfig;
//
// 赋波特率值
//
for(lIdx = 0; lIdx < 12; lIdx++)
{
if(lRates[lIdx] == lDataRate)
{
break;
}
}
if(lIdx == 12)
{
return(0);
}
lConfig = lDivisors[lIdx];
//
// 设置有效的数据位宽度
//
switch(lDataBits)
{
case 5:
{
lConfig |= HwUartControlDataLength5;
break;
}
case 6:
{
lConfig |= HwUartControlDataLength6;
break;
}
case 7:
{
lConfig |= HwUartControlDataLength7;
break;
}
case 8:
{
lConfig |= HwUartControlDataLength8;
break;
}
default:
{
return(0);
}
}
//
// 设置停止位个数
//
if(lStopBits == 2)
{
lConfig |= HwUartControlTwoStopBits;
}
else if(lStopBits != 1)
{
return(0);
}
//
// 设置奇偶位校验
//
if(lParity)
{
lConfig |= HwUartControlParityEnable;
//
// 偶数位
//
if(lEvenParity)
{
//
// 改变奇数位为偶数位 (默认是奇数位).
//
lConfig |= HwUartControlParityEven;
}
}
//
// 设置,使能 UART.
//
//
// 关闭 RTS.
//
// pucPtr[HwPortB] &= ~HwPortBRTS;
//
// 打开 UART.
//
*((unsigned long *)(pucPtr + HwControl)) |= HwControlUartEnable;
//
// 设置 UART.
//
*((unsigned long *)(pucPtr + HwUartControl)) =
lConfig | HwUartControlFifoEnable;
}
//****************************************************************************
//
// UARTDisable 关闭 UART.
//
//****************************************************************************
void
UARTDisable(long lPort)
{
unsigned char * volatile pucPtr = (unsigned char *)HwBaseAddress;
//
// 如果UART已经关闭,返回
//
if(!lPort1Enabled)
{
return;
}
//
// 检查传送数据的 FIFO 是否为空,若不为空,循环等待.
//
while(*((unsigned long *)(pucPtr + HwStatus)) & HwStatusUartTxBusy)
{
}
//
// 关闭 UART.
//
*((unsigned long *)(pucPtr + HwControl)) &= ~HwControlUartEnable;
//
// 标记 UART 为关
//
lPort1Enabled = 0;
}
}
//****************************************************************************
//
// UARTSendChar 发送一个字符到串口 UART.
//
//****************************************************************************
void
UARTSendChar(long lPort, char cChar)
{
unsigned char * volatile pucPtr = (unsigned char *)HwBaseAddress;
//
// 循环等待直到传送数据的UART FIFO 为空.
//
while(*((unsigned long *)(pucPtr + HwStatus)) & HwStatusUartTxFifoFull)
{
}
//
// 写字符到串口 UART.
//
pucPtr[HwUartData] = cChar;
}
//****************************************************************************
//
// UARTReceiveChar 从串口 UART 接收字符
//
//****************************************************************************
char
UARTReceiveChar(long lPort)
{
unsigned char * volatile pucPtr = (unsigned char *)HwBaseAddress;
//
// 循环等待直到接收数据的UART FIFO 内有数据
//
while(*((unsigned long *)(pucPtr + HwStatus)) &
HwStatusUartRxFifoEmpty)
{
}
//
// 从串口 UART 读出数据,并返回
//
return(pucPtr[HwUartData]);
}
//****************************************************************************
//
// UARTCharReady 判断是否在串口有数据等待接收
//
//****************************************************************************
long
UARTCharReady(long lPort)
{
unsigned char * volatile pucPtr = (unsigned char *)HwBaseAddress;
//
// 检查是否有数据在UART FIFO 等待
//
if(*((unsigned long *)(pucPtr + HwStatus)) & HwStatusUartRxFifoEmpty)
{
//
// 没有数据,返回 0
//
return(0);
}
//
// 有数据,返回 1
//
return(1);
}
************************************************************************************************************************************************
串口的C编程
#ifndef _RS232_H
#define _RS232_H
#include
#include
#include
class RS232 {
private:
HANDLE Comdrv;
DWORD Baudrate(long baudrate);
public:
int Open(char *name,int Insize,int Outsize,long baudrate,int bytesize,int parity,int stopbit);
int Close(void);
int Clear(void);
int ClearIn(void);
int Length(void);
DWORD ModemStatus(void);
int Read(char *buffer,int len);
int Write(char *buffer,int len);
};
DWORD RS232::Baudrate(long baudrate)
{ switch (baudrate)
{ case 110 : return CBR_110;
case 300 : return CBR_300;
case 600 : return CBR_600;
case 1200 : return CBR_1200;
case 2400 : return CBR_2400;
case 4800 : return CBR_4800;
case 9600 : return CBR_9600;
case 14400 : return CBR_14400;
case 19200 : return CBR_19200;
case 38400 : return CBR_38400;
case 56000 : return CBR_56000;
case 57600 : return CBR_57600;
case 115200 : return CBR_115200;
case 128000 : return CBR_128000;
case 256000 : return CBR_256000;
}
return CBR_9600;
}
// MS_CTS_ON The CTS (clear-to-send) signal is on.
// MS_DSR_ON The DSR (data-set-ready) signal is on.
// MS_RING_ON The ring indicator signal is on.
// MS_RLSD_ON The RLSD (receive-line-signal-detect) signal is on.
DWORD RS232::ModemStatus(void)
{ DWORD stat;
if (GetCommModemStatus(Comdrv,&stat)) return stat;
return 0L;
}
int RS232::Length(void)
{ COMSTAT comstate;
DWORD error;
ClearCommError(Comdrv,&error,&comstate);
if (error==0) return (int)comstate.cbInQue;
return -1;
}
int RS232::Open(char *name,int Insize,int Outsize,long baudrate,int bytesize,int parity,int stopbit)
{ COMMTIMEOUTS commtmout;
DCB comdcb;
Comdrv=CreateFile(name,GENERIC_READ+GENERIC_WRITE,0,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL);
if (Comdrv==INVALID_HANDLE_VALUE) return 0;
SetCommMask(Comdrv,EV_RXCHAR);
SetupComm(Comdrv,Insize,Outsize);
commtmout.ReadIntervalTimeout=0xFFFFFFFF;
commtmout.ReadTotalTimeoutMultiplier=0;
commtmout.ReadTotalTimeoutConstant=0;
commtmout.WriteTotalTimeoutMultiplier=0;
commtmout.WriteTotalTimeoutConstant=5000;
SetCommTimeouts(Comdrv,&commtmout);
GetCommState(Comdrv,&comdcb);
comdcb.BaudRate=Baudrate(baudrate);
comdcb.ByteSize=bytesize; //8;
comdcb.Parity=parity; //NOPARITY;
comdcb.StopBits=stopbit; //ONESTOPBIT;
SetCommState(Comdrv,&comdcb);
return 1;
}
int RS232::Close(void)
{ if (CloseHandle(Comdrv)) return 1;
return 0;
}
int RS232::Read(char *buffer,int len)
{ DWORD nread;
if (ReadFile(Comdrv,buffer,len,&nread,NULL)) return (int)nread;
return -1;
}
int RS232::Write(char *buffer,int len)
{ DWORD nwrite;
if (WriteFile(Comdrv,buffer,len,&nwrite,NULL)) return (int)nwrite;
return -1;
}
int RS232::Clear(void)
{ if (PurgeComm(Comdrv,PURGE_TXCLEAR|PURGE_RXCLEAR)) return 1;
return 0;
}
int RS232::ClearIn(void)
{ if (PurgeComm(Comdrv,PURGE_RXCLEAR)) return 1;
return 0;
}
#pragma pack()
#endif
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