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c语言串口库函数 c语言串口通信函数

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,按照串口库函数标识实现调用就可以了。

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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

看驱动程序的接口啊

一般是是open(“口名”)

用C/C++写一扒游个小程序读取串口接收到贺此销的数据

你太幸运了,刚好我有一个,你在禅游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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单片机串口收发中,用printf和用sbuf的区别在哪里

sbuf 是51单片机中的串亮旅口数据寄存器,接收和发送用的升启都是它(实际是两敬笑凳个寄存器),

而printf是C语言的库函数,它可以通过串口和并口输出数据,若用串口输出数据,需重新定位fput c()函数,printf调用fput c()函数,fput c()函数调用串口发送命令,最终是操作sbuf 这个寄存器

C语言字符串处理的库函数有哪些

函数名: strrchr

功 能: 在串中查找指定字森告宴符的最后一个出现

用 法: char *strrchr(char *str, char c);

举例:

[cpp] view plain copy

char fullname="./lib/lib1.so";

char *ptr;

ptr = strrchr(fullname,'/');

printf("filename is %s",++ptr);

//运行结果:filename is lib1.so

函数名: strchr

功 能: 在串中查找指定字符的第一个出现友慎

用 法: char *strchr(char *str, char c);

举例:

[cpp] view plain copy

char fullname="./lib/lib1.so";

char *ptr;

ptr = strrchr(fullname,'.');

printf("after strchr() is %s",++ptr);

//运行结此银果:after strchr() is /lib/lib1.so

函数名: strtok

功 能: 在串中查找指定字符的第一个出现

用 法: char *strtok(char *s, char *delim);

说明:

1.strtok函数的实质上的处理是,strtok在s中查找包含在delim中的字符并用NULL(’/0′)来替换,直到找遍整个字符串。这句话有两层含义:(1)每次调用strtok函数只能获得一个分割单位。(2)要获得所有的分割单元必须反复调用strtok函数。

2.strtok函数以后的调用时的需用NULL来替换s.

3.形参s(要分割的字符串)对应的变量应用char s[]=”….”形式,而不能用char *s=”….”形式。

举例:

[cpp] view plain copy

void main()

{

char buf[]=”Golden Global View”;

char* token = strtok( buf, ” “);

while( token != NULL )

{

printf( ”%s “, token );

token = strtok( NULL, ” “);

}

return 0;

}

/*其结果为:

Golden

Global

View

*/

函数名:strncpy

功能:把src所指由NULL结束的字符串的前n个字节复制到dest所指的数组中

用法:char *strncpy(char *dest, char *src, int n);

说明:

如果src的前n个字节不含NULL字符,则结果不会以NULL字符结束。

如果src的长度小于n个字节,则以NULL填充dest直到复制完n个字节。

src和dest所指内存区域不可以重叠且dest必须有足够的空间来容纳src的字符串。

返回指向dest的指针。

举例:

[c-sharp] view plain copy

#include syslib.h

#include string.h

main()

{

char buf[4];

char *s="abcdefg";

strncpy(buf,s,4);

printf("%s/n",buf);

return 0;

}

/*运行结果:

abcd

*/

函数名: stpcpy

功 能: 拷贝一个字符串到另一个

用 法: char *stpcpy(char *destin, char *source);

举例:

[cpp] view plain copy

#include stdio.h

#include string.h

int main(void)

{

char string[10];

char *str1 = "abcdefghi";

stpcpy(string, str1);

printf("%s/n", string);

return 0;

}

/*运行结果

abcdefghi

*/

函数名: strcat

功 能: 字符串拼接函数

用 法: char *strcat(char *destin, char *source);

举例:

[cpp] view plain copy

#include string.h

#include stdio.h

int main(void)

{

char destination[25];

char *blank = " ", *c = "C++", *Borland = "Borland";

strcpy(destination, Borland);

strcat(destination, blank);

strcat(destination, c);

printf("%s/n", destination);

return 0;

}

/*运行结果:

Borland C++

*/

函数名: strcmp

功 能: 串比较

用 法: int strcmp(char *str1, char *str2);

看Asic码,str1str2,返回值 0;两串相等,返回0

举例:

[cpp] view plain copy

#include string.h

#include stdio.h

int main(void)

{

char *buf1 = "aaa", *buf2 = "bbb";

int ptr;

ptr = strcmp(buf2, buf1);

if (ptr 0)

printf("buffer 2 is greater than buffer 1/n");

else if(ptr 0)

printf("buffer 2 is less than buffer 1/n");

else

printf("buffer 2 is equal with buffer 1/n");

return 0;

}

/*运行结果:

buffer 2 is greater than buffer 1

*/

函数名: strncmpi

功 能: 将一个串中的一部分与另一个串比较, 不管大小写

用 法: int strncmpi(char *str1, char *str2, unsigned maxlen);

举例:

[cpp] view plain copy

#include string.h

#include stdio.h

int main(void)

{

char *buf1 = "BBB", *buf2 = "bbb";

int ptr;

ptr = strcmpi(buf2, buf1);

if (ptr 0)

printf("buffer 2 is greater than buffer 1/n");

if (ptr 0)

printf("buffer 2 is less than buffer 1/n");

if (ptr == 0)

printf("buffer 2 equals buffer 1/n");

return 0;

}

函数名: strcspn

功 能: 在串中查找第一个给定字符集内容的段

用 法: int strcspn(char *str1, char *str2);

举例:

[cpp] view plain copy

#include stdio.h

#include string.h

#include alloc.h

int main(void)

{

char *string1 = "1234567890";

char *string2 = "747DC8";

int length;

length = strcspn(string1, string2);

printf("Character where strings intersect is at position %d/n", length);

return 0;

}

函数名: strdup

功 能: 将串拷贝到新建的位置处

用 法: char *strdup(char *str);

举例:

[cpp] view plain copy

#include stdio.h

#include string.h

#include alloc.h

int main(void)

{

char *dup_str, *string = "abcde";

dup_str = strdup(string);

printf("%s/n", dup_str);

free(dup_str);

return 0;

}

函数名: stricmp

功 能: 以大小写不敏感方式比较两个串

用 法: int stricmp(char *str1, char *str2);

举例:

[cpp] view plain copy

#include string.h

#include stdio.h

int main(void)

{

char *buf1 = "BBB", *buf2 = "bbb";

int ptr;

ptr = stricmp(buf2, buf1);

if (ptr 0)

printf("buffer 2 is greater than buffer 1/n");

if (ptr 0)

printf("buffer 2 is less than buffer 1/n");

if (ptr == 0)

printf("buffer 2 equals buffer 1/n");

return 0;

}

函数名: strerror

功 能: 返回指向错误信息字符串的指针

用 法: char *strerror(int errnum);

举例:

[cpp] view plain copy

#include stdio.h

#include errno.h

int main(void)

{

char *buffer;

buffer = strerror(errno);

printf("Error: %s/n", buffer);

return 0;

}

函数名: strncmp

功 能: 串比较

用 法: int strncmp(char *str1, char *str2, int maxlen);

举例:

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#include string.h

#include stdio.h

int main(void)

{

char *buf1 = "aaabbb", *buf2 = "bbbccc", *buf3 = "ccc";

int ptr;

ptr = strncmp(buf2,buf1,3);

if (ptr 0)

printf("buffer 2 is greater than buffer 1/n");

else

printf("buffer 2 is less than buffer 1/n");

ptr = strncmp(buf2,buf3,3);

if (ptr 0)

printf("buffer 2 is greater than buffer 3/n");

else

printf("buffer 2 is less than buffer 3/n");

return(0);

}

函数名: strncmpi

功 能: 把串中的一部分与另一串中的一部分比较, 不管大小写

用 法: int strncmpi(char *str1, char *str2, int len);

举例:

[cpp] view plain copy

#include string.h

#include stdio.h

int main(void)

{

char *buf1 = "BBBccc", *buf2 = "bbbccc";

int ptr;

ptr = strncmpi(buf2,buf1,3);

if (ptr 0)

printf("buffer 2 is greater than buffer 1/n");

if (ptr 0)

printf("buffer 2 is less than buffer 1/n");

if (ptr == 0)

printf("buffer 2 equals buffer 1/n");

return 0;

}

函数名: strnset

功 能: 将一个串中的所有字符都设为指定字符

用 法: char *strnset(char *str, char ch, unsigned n);

举例:

[cpp] view plain copy

#include stdio.h

#include string.h

int main(void)

{

char *string = "abcdefghijklmnopqrstuvwxyz";

char letter = 'x';

printf("string before strnset: %s/n", string);

strnset(string, letter, 13);

printf("string after strnset: %s/n", string);

return 0;

}

函数名: strpbrk

功 能: 在串中查找给定字符集中的字符

用 法: char *strpbrk(char *str1, char *str2);

举例:

[cpp] view plain copy

#include stdio.h

#include string.h

int main(void)

{

char *string1 = "abcdefghijklmnopqrstuvwxyz";

char *string2 = "onm";

char *ptr;

ptr = strpbrk(string1, string2);

if (ptr)

printf("strpbrk found first character: %c/n", *ptr);

else

printf("strpbrk didn't find character in set/n");

return 0;

}

函数名: strrev

功 能: 串倒转

用 法: char *strrev(char *str);

举例:

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#include string.h

#include stdio.h

int main(void)

{

char *forward = "string";

printf("Before strrev(): %s/n", forward);

strrev(forward);

printf("After strrev(): %s/n", forward);

return 0;

}

/*运行结果:

Before strrev(): string

After strrev(): gnirts

*/

函数名: strstr

功 能: 在串中查找指定字符串的第一次出现

用 法: char *strstr(char *str1, char *str2);

举例:

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#include stdio.h

#include string.h

int main(void)

{

char *str1 = "Borland International", *str2 = "nation", *ptr;

ptr = strstr(str1, str2);

printf("The substring is: %s/n", ptr);

return 0;

}

函数名: strtod

功 能: 将字符串转换为double型值

用 法: double strtod(char *str, char **endptr);

举例:

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#include stdio.h

#include stdlib.h

int main(void)

{

char input[80], *endptr;

double value;

printf("Enter a floating point number:");

gets(input);

value = strtod(input, endptr);

printf("The string is %s the number is %lf/n", input, value);

return 0;

}

函数名: strtol

功 能: 将串转换为长整数

用 法: long strtol(char *str, char **endptr, int base);

举例:

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#include stdlib.h

#include stdio.h

int main(void)

{

char *string = "87654321", *endptr;

long lnumber;

/* strtol converts string to long integer */

lnumber = strtol(string, endptr, 10);

printf("string = %s long = %ld/n", string, lnumber);

return 0;

}

函数名: strupr

功 能: 将串中的小写字母转换为大写字母

用 法: char *strupr(char *str);

举例:

[cpp] view plain copy

#include stdio.h

#include string.h

int main(void)

{

char *string = "abcdefghijklmnopqrstuvwxyz", *ptr;

/* converts string to upper case characters */

ptr = strupr(string);

printf("%s/n", ptr);

return 0;

}


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