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
标签:作文经典 上一篇:描写毛毛虫的词语 描写毛毛虫行动的词语 下一篇:成语误用褒贬的例子 褒贬误用的成语
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:
[cpp] view plain copy
#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:
[cpp] view plain copy
#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:
[cpp] view plain copy
#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:
[cpp] view plain copy
#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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