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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
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
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
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
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