c语言LOBYTE函数 c语言ioctl函数

c 获取串口号 c 自动获取串口号

用C怎么写获取串口的内容

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看驱动程序的接口啊

一般是是open(“口名”)

用C/C++写一个小程序读取串口接收到的数据

你太幸运了，刚好我有一个，你在vc++6.0下测试一下。

/* serrecv.c */

/* Receives and saves a file over a serial port */

/* Last modified: Septemeber 21, 2005 */

/* [goman89] */

#include

#include

#include

/* Function to print out usage information */

void usage(void);

/* Function to set up the serial port settings with the specified baud rate,

no parity, and one stop bit */

void set_up_serial_port(HANDLE h, long baud);

/* Function to receive and save file from serial port */

void get_file_from_serial_port(HANDLE h, char *file_name, unsigned long file_length);

int main(int argc, char **argv)

{

HANDLE serial_port; /* Handle to the serial port */

long baud_rate = 9600; /* Baud rate */

char port_name[] = "COM1:"; /* Name of serial port */

unsigned long file_size; /* Size of file to receive in bytes */

unsigned long bytes_received; /* Bytes received from serial port */

unsigned long file_name_size; /* Size of file name in bytes */

char file_name[256]; /* Name of file to receive */

/* Check mand line */

if (argc == 3)

{

/* Read in baud rate */

if (argv[1][1] != 'b' || sscanf(argv[2], "%ld", baud_rate) != 1)

{

usage;

exit(0);

}

}

else if (argc != 1)

{

usage;

exit(0);

}

/* Open up a handle to the serial port */

serial_port = CreateFile(port_name, GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING, 0, 0);

/* Make sure port was opened */

if (serial_port == INVALID_HANDLE_VALUE)

{

fprintf(stderr, "Error opening port\n");

CloseHandle(serial_port);

exit(0);

}

/* Set up the serial port */

set_up_serial_port(serial_port, baud_rate);

/* Receive file name size from serial port */

ReadFile(serial_port, (void *)file_name_size, sizeof(unsigned long), bytes_received, NULL);

if (bytes_received != sizeof(unsigned long))

{

fprintf(stderr, "Error getting file name size.\n");

CloseHandle(serial_port);

exit(0);

}

/* Receive file name from serial port */

ReadFile(serial_port, (void *)file_name, file_name_size, bytes_received, NULL);

if (bytes_received != file_name_size)

{

fprintf(stderr, "Error retrieving file name.\n");

CloseHandle(serial_port);

exit(0);

}

/* Append NULL terminator to end of string */

file_name[bytes_received] = '\0';

/* Receive file size from serial port */

ReadFile(serial_port, (void *)file_size, sizeof(unsigned long), bytes_received, NULL);

if (bytes_received != sizeof(unsigned long))

{

fprintf(stderr, "Error getting file size.\n");

CloseHandle(serial_port);

exit(0);

}

/* Get the file from the serial port */

get_file_from_serial_port(serial_port, file_name, file_size);

/* Print out success information */

printf("\n%lu bytes successfully received and saved as %s\n", file_size, file_name);

/* Close handle */

CloseHandle(serial_port);

return 0;

}

void usage(void)

{

fprintf(stderr, "Usage:\n");

fprintf(stderr, "\tserrecv [-b baud rate]\n");

fprintf(stderr, "\tDefault baud rate is 9600\n");

fprintf(stderr, "tSupported baud rates: 1200, 2400, 4800, 9600, 14400, 19200\n");

return;

}

void set_up_serial_port(HANDLE h, long baud)

{

DCB properties; /* Properties of serial port */

/* Get the properties */

GetmState(h, properties);

/* Set the baud rate */

switch(baud)

{

case 1200:

properties.BaudRate = CBR_1200;

break;

case 2400:

properties.BaudRate = CBR_2400;

break;

case 4800:

properties.BaudRate = CBR_4800;

break;

case 9600:

properties.BaudRate = CBR_9600;

break;

case 14400:

properties.BaudRate = CBR_14400;

break;

case 19200:

properties.BaudRate = CBR_19200;

break;

case 38400:

properties.BaudRate = CBR_38400;

break;

default:

fprintf(stderr, "Invalid baud rate: %ld\n", baud);

usage;

exit(0);

break;

}

/* Set the other properties */

properties.Parity = NOPARITY;

properties.ByteSize = 8;

properties.StopBits = ONESTOPBIT;

SetmState(h, properties);

return;

}

void get_file_from_serial_port(HANDLE h, char *file_name, unsigned long file_length)

{

FILE *data_file; /* File to create */

unsigned long bytes_left = file_length; /* Bytes left to receive */

unsigned long bytes_received_total = 0; /* Total bytes received */

unsigned long bytes_to_receive; /* Number of bytes to receive */

unsigned long bytes_received; /* Number of bytes receive */

char buffer[200]; /* Buffer to store data */

/* Open the file */

data_file = fopen(file_name, "wb");

/* Quit if file couldn't be opened */

if (data_file == NULL)

{

fprintf(stderr, "Could not create file %s\n", file_name);

CloseHandle(h);

exit(0);

}

while (1)

{

/* Determine how many bytes to read */

if (bytes_left == 0)

{

break;

}

else if (bytes_left 200)

{

bytes_to_receive = bytes_left;

}

else

{

bytes_to_receive = 200;

}

/* Receive data over serial cable */

ReadFile(h, (void *)buffer, bytes_to_receive, bytes_received, NULL);

if (bytes_received != bytes_to_receive)

{

fprintf(stderr, "Error reading file.\n");

CloseHandle(h);

exit(0);

}

/* Save buffer to file */

fwrite((void *)buffer, 1, bytes_received, data_file);

/* Decrement number of bytes left */

bytes_left -= bytes_received;

/* Increment number of bytes received */

bytes_received_total += bytes_received;

/* Print out progress */

printf("\r%5lu bytes received.", bytes_received_total);

}

fclose(data_file);

return;

}

C语言变成实现串口收发数据

#include 

#include 

int main(void)

{

FILE *fp;

char temp;

char buf[100];

if((fp = fopen("3","r")) == NULL)

puts("this way doesn't work!\n");

else

puts("this way works!\n");

while(1)

{

temp = 0;

fscanf(fp,"%c",temp);

if(temp != 0)

putchar(temp);

else

Sleep(100);

}

fclose(fp);

return 0;

}

以前弄的，好久没看了，不知到对不对。

还有下面这段：

#include 

#include 

HANDLE h;

int main(void)

{

h=CreateFile(TEXT("COM3"),//COM1口

GENERIC_READ|GENERIC_WRITE, //允许读和写

0, //独方式

NULL,

OPEN_EXISTING, //打开而不是创建

0, //同步方式

NULL);

if(h==(HANDLE)-1)

{

printf("打开COM失败!\n");

return FALSE;

}

else

{

printf("COM打开成功！\n");

}

Setupm(h,1024,1024); //输入缓冲区和输出缓冲区大小都是1024

COMMTIMEOUTS TimeOuts;

//设读超时

TimeOuts.ReadIntervalTimeout=1000;

TimeOuts.ReadTotalTimeoutMultiplier=500;

TimeOuts.ReadTotalTimeoutConstant=5000;

//设定写超时

TimeOuts.WriteTotalTimeoutMultiplier=500;

TimeOuts.WriteTotalTimeoutConstant=2000;

SetmTimeouts(h,TimeOuts); //设置超时

DCB dcb;

GetmState(h,dcb);

dcb.BaudRate=9600; //波特率为9600

dcb.ByteSize=8; //每个字节有8位

dcb.Parity=NOPARITY; //无奇偶校验位

dcb.StopBits=ONE5STOPBITS; //两个停止位

SetmState(h,dcb);

DWORD wCount;//读取的节数

BOOL bReadStat;

while(1)

{

Purgem(h,PURGE_TXCLEAR|PURGE_RXCLEAR); //清缓冲区

char str[9]={0};

printf("%s\n",str);

bReadStat=ReadFile(h,str,9,wCount,NULL);

if(!bReadStat)

{

printf("

怎么通过串口读取51单片机某个地址的数据？请用C语言写出来。

*

授人以鱼,不如授人以渔

*

首先，你要明确在C语中读取内存址是基于指针。

3.比如读取内存地址0x22中的数据

C语言中对于内存的访是基于指，这个毋庸置疑，具体操如下

unsigned int *p= （unsigned int*）0x22 ；//定义针，并且使指针指向了0x22这个        内存地址；

那么*p就是最终你要读取的数据了。

4.至于如何通过串口显示到电脑我就不多了（这不是难点），据你都知道了，写到串口   缓冲区，在串口调试助手下就可以看到。

5.虽然没有贴出具体代码，但这里面的思想可以让你解决

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Linux下如何使用c/c++实现检测新增串口，并读取串口号

Linux下面有设文件

串口装好驱动后 会显示在dev下

然后对这个

C语言中如何对串口进行操作

C语言会有操作串口的库函数的，按照串口库数标识实现调

电脑上的串口号是什么意思

串口叫做串行接口,也串行通信接口,按电气标准及协议来分包括RS-232-C、RS-422、RS485、USB等。 RS-232-C、RS-422与RS-485标准对接口的电气特性做出规定,不涉及接插件、电缆或协议。USB是近几年发展起来的新型接口标准,主要应用于速数据传输域。 RS-232-C:也称标准串口,是目前最常用的一种串行通讯接口。它是在1970年由美国电子工业协会(EIA)联合贝尔系统、 调制解调器厂家及计算机终端生产厂共同制定的用于串行通讯的标 准。它的名是“数据终端设备(DTE)和数据通讯设备(DCE)之间 行二进制数据交换接口技术标准”。传统的RS-232-C接口标准有22根线,采用标准25芯D型插头座。后来的PC上使用简化了的9芯D插座。现在应用中25芯插头已很少采用。现在的电脑般有两个串行口:COM1和COM2,你到计算机后面能看到9针D形接口就是了。现在有很多手数据线或者物流接收器都采用COM

如何用C语言写一个读、写串口的程序？

大致过程就是

配置串口通信，包串口号、波特、验位、停止位这些信息；

打开串口，和打开文件一样，在Linux是这样，Windows下没试过，估计也差不多；

发送数据，即写串口，就跟写文件类似；

读取

编写单片机串口收发数据的完整程序（C语言编写）

我用的新唐芯片，8051内核，跟51差不多，望采纳

void UART_Initial (void)

{

P02_Quasi_Mode; //Setting UART pin as Quasi mode for tran *** it

P16_Quasi_Mode; //Setting UART pin as Quasi mode for tran *** it

SCON_1 = 0x50; //UART1 Mode1,REN_1=1,TI_1=1

T3CON = 0x08; //T3PS2=0,T3PS1=0,T3PS0=0(Prescale=1), UART1 in MODE 1

clr_BRCK;

RH3 = HIBYTE(65536 - (1000000/u32Baudrate)-1); /*16 MHz */

RL3 = LOBYTE(65536 - (1000000/u32Baudrate)-1); /*16 MHz */

set_TR3; //Trigger Timer3

}

以上是初始化的

void Send_Data_To_UART1(UINT8 c)

{

TI_1 = 0;

SBUF_1 = c;

while(TI_1==0);

}

这个是发送

void UART_isr (void) interrupt 4 //

怎样在WINDOWS下用C语言编写串口接收数据程序

#include

#include

int main(void)

{

FILE *fp;

char temp;

char buf[100];

if((fp = fopen("3","r")) == NULL)

puts("this way doesn't work!\n");

else

puts("this way works!\n");

while(1)

{

temp = 0;

fscanf(fp,"%c",temp);

if(temp != 0)

putchar(temp);

else

Sleep(100);

}

fclose(fp);

return 0;

}

以前的，好久看，不知到对不对。

还下面这段：

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#include

#include

HANDLE h;

int main(void)

{

h=CreateFile(TEXT("COM3"),//COM1口

GENERIC_READ|GENERIC_WRITE, //允许读和写

0, //独占方式

NULL,

OPEN_EXISTING, //打开而不是建

0, //同步式

NULL);

if(h==(HANDLE)-1)

{

printf("打开COM失败!\n");

return FALSE;

}

else

{

printf("COM打开成功！\n");

}

Setupm(h,1024,1024); //输入缓冲区和输出缓冲区的大小都是1024

COMMTIMEOUTS TimeOuts;

//定读超时

TimeOuts.ReadIntervalTimeout=1000;

TimeOuts.ReadTotalTimeoutMultiplier=500;

TimeOuts.ReadTotalTimeoutConstant=5000;

//设定写超时

TimeOuts.WriteTotalTimeoutMultiplier=500;

TimeOuts.WriteTotalTimeoutConstant=2000;

SetmTimeouts(h,TimeOuts); //设置超时

DCB dcb;

GetmState(h,dcb);

dcb.BaudRate=9600; //波特率为9600

dcb.ByteSize=8; //每个字节有8位

dcb.Parity=NOPARITY; //无奇偶校验位

dcb.StopBits=ONE5STOPBITS; //两个停止位

SetmState(h,dcb);

DWORD wCount;//读取的字节

BOOL bReadStat;

while(1)

{

Purgem(h,PURGE_TXCLEAR|PURGE_RXCLEAR); //清空缓冲区

char str[9]={0};

printf("%s\n",str);

bReadStat=ReadFile(h,str,9,wCount,NULL);

if(!bReadStat)

{

printf("读串口

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求C语言函数大全

函数名: abort

功 能: 异常终止一个进程

用 法: void abort(void);

程序例:

#include stdio.h

#include stdlib.h

int main(void)

{

printf("Calling abort()\n");

abort();

return 0; /* This is never reached */

}

函数名: abs

功 能: 求整数的绝对值

用 法: int abs(int i);

程序例:

#include stdio.h

#include math.h

int main(void)

{

int number = -1234;

printf("number: %d absolute value: %d\n", number, abs(number));

return 0;

}

函数名: absread, abswirte

功 能: 绝对磁盘扇区读、写数据

用 法: int absread(int drive, int nsects, int sectno, void *buffer);

int abswrite(int drive, int nsects, in tsectno, void *buffer);

程序例:

/* absread example */

#include stdio.h

#include conio.h

#include process.h

#include dos.h

int main(void)

{

int i, strt, ch_out, sector;

char buf[512];

printf("Insert a diskette into drive A and press any key\n");

getch();

sector = 0;

if (absread(0, 1, sector, buf) != 0)

{

perror("Disk problem");

exit(1);

}

printf("Read OK\n");

strt = 3;

for (i=0; i80; i++)

{

ch_out = buf[strt+i];

putchar(ch_out);

}

printf("\n");

return(0);

}

函数名: access

功 能: 确定文件的访问权限

用 法: int access(const char *filename, int amode);

程序例:

#include stdio.h

#include io.h

int file_exists(char *filename);

int main(void)

{

printf("Does NOTEXIST.FIL exist: %s\n",

file_exists("NOTEXISTS.FIL") ? "YES" : "NO");

return 0;

}

int file_exists(char *filename)

{

return (access(filename, 0) == 0);

}

函数名: acos

功 能: 反余弦函数

用 法: double acos(double x);

程序例:

#include stdio.h

#include math.h

int main(void)

{

double result;

double x = 0.5;

result = acos(x);

printf("The arc cosine of %lf is %lf\n", x, result);

return 0;

}

函数名: allocmem

功 能: 分配DOS存储段

用 法: int allocmem(unsigned size, unsigned *seg);

程序例:

#include dos.h

#include alloc.h

#include stdio.h

int main(void)

{

unsigned int size, segp;

int stat;

size = 64; /* (64 x 16) = 1024 bytes */

stat = allocmem(size, segp);

if (stat == -1)

printf("Allocated memory at segment: %x\n", segp);

else

printf("Failed: maximum number of paragraphs available is %u\n",

stat);

return 0;

}

函数名: arc

功 能: 画一弧线

用 法: void far arc(int x, int y, int stangle, int endangle, int radius);

程序例:

#include graphics.h

#include stdlib.h

#include stdio.h

#include conio.h

int main(void)

{

/* request auto detection */

int gdriver = DETECT, gmode, errorcode;

int midx, midy;

int stangle = 45, endangle = 135;

int radius = 100;

/* initialize graphics and local variables */

initgraph(gdriver, gmode, "");

/* read result of initialization */

errorcode = graphresult(); /* an error occurred */

if (errorcode != grOk)

{

printf("Graphics error: %s\n", grapherrormsg(errorcode));

printf("Press any key to halt:");

getch();

exit(1); /* terminate with an error code */

}

midx = getmaxx() / 2;

midy = getmaxy() / 2;

setcolor(getmaxcolor());

/* draw arc */

arc(midx, midy, stangle, endangle, radius);

/* clean up */

getch();

closegraph();

return 0;

}

函数名: asctime

功 能: 转换日期和时间为ASCII码

用 法: char *asctime(const struct tm *tblock);

程序例:

#include stdio.h

#include string.h

#include time.h

int main(void)

{

struct tm t;

char str[80];

/* sample loading of tm structure */

t.tm_sec = 1; /* Seconds */

t.tm_min = 30; /* Minutes */

t.tm_hour = 9; /* Hour */

t.tm_mday = 22; /* Day of the Month */

t.tm_mon = 11; /* Month */

t.tm_year = 56; /* Year - does not include century */

t.tm_wday = 4; /* Day of the week */

t.tm_yday = 0; /* Does not show in asctime */

t.tm_isdst = 0; /* Is Daylight SavTime; does not show in asctime */

/* converts structure to null terminated

string */

strcpy(str, asctime(t));

printf("%s\n", str);

return 0;

}

函数名: asin

功 能: 反正弦函数

用 法: double asin(double x);

程序例:

#include stdio.h

#include math.h

int main(void)

{

double result;

double x = 0.5;

result = asin(x);

printf("The arc sin of %lf is %lf\n", x, result);

return(0);

}

函数名: assert

功 能: 测试一个条件并可能使程序终止

用 法: void assert(int test);

程序例:

#include assert.h

#include stdio.h

#include stdlib.h

struct ITEM {

int key;

int value;

};

/* add item to list, make sure list is not null */

void additem(struct ITEM *itemptr) {

assert(itemptr != NULL);

/* add item to list */

}

int main(void)

{

additem(NULL);

return 0;

}

函数名: atan

功 能: 反正切函数

用 法: double atan(double x);

程序例:

#include stdio.h

#include math.h

int main(void)

{

double result;

double x = 0.5;

result = atan(x);

printf("The arc tangent of %lf is %lf\n", x, result);

return(0);

}

函数名: atan2

功 能: 计算Y/X的反正切值

用 法: double atan2(double y, double x);

程序例:

#include stdio.h

#include math.h

int main(void)

{

double result;

double x = 90.0, y = 45.0;

result = atan2(y, x);

printf("The arc tangent ratio of %lf is %lf\n", (y / x), result);

return 0;

}

函数名: atexit

功 能: 注册终止函数

用 法: int atexit(atexit_t func);

程序例:

#include stdio.h

#include stdlib.h

void exit_fn1(void)

{

printf("Exit function #1 called\n");

}

void exit_fn2(void)

{

printf("Exit function #2 called\n");

}

int main(void)

{

/* post exit function #1 */

atexit(exit_fn1);

/* post exit function #2 */

atexit(exit_fn2);

return 0;

}

函数名: atof

功 能: 把字符串转换成浮点数

用 法: double atof(const char *nptr);

程序例:

#include stdlib.h

#include stdio.h

int main(void)

{

float f;

char *str = "12345.67";

f = atof(str);

printf("string = %s float = %f\n", str, f);

return 0;

}

函数名: atoi

功 能: 把字符串转换成长整型数

用 法: int atoi(const char *nptr);

程序例:

#include stdlib.h

#include stdio.h

int main(void)

{

int n;

char *str = "12345.67";

n = atoi(str);

printf("string = %s integer = %d\n", str, n);

return 0;

}

函数名: atol

功 能: 把字符串转换成长整型数

用 法: long atol(const char *nptr);

程序例:

#include stdlib.h

#include stdio.h

int main(void)

{

long l;

char *str = "98765432";

l = atol(lstr);

printf("string = %s integer = %ld\n", str, l);

return(0);

}

关于c语言宏定义

typedef unsigned char BYTE;

typedef unsigned short WORD;

意思是可以用BYTE替代unsigned char

是对的，BYTE，WORD是新的变量类型

#define LOBYTE(w) ((BYTE)(WORD)(w))

这里是宏定义。类似函数定义，w作为参数，是文本。在编译时把LOBYTE(w)变为 ((BYTE)(WORD)(w))。比如输入:

WORD dat;

BYTE b ;

b=LOBYTE(dat);

编译时会替换为b=((BYTE)(WORD)(dat));意思是得到低字节部分。

同理HIBYTE得到高字节部分