Question

请懂用c++或者c编写串口程序

现在要将单片机采集的传感器数据从串口接收到电脑，设计一个程序将数据保存，并在软件显示，保存可以用excel，显示能够进行波形图显示。

不知道表达清楚没有，希望懂的大牛，给予指导，或者提供我入手的思路、资料、方向等，小弟感谢不尽~~

Answer 1

推荐看书
Visual C++_Turbo C串口通信编程实践

百度文库里有不少资料

Answer 2

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 */
/* */

#include <windows.h>
#include <stdio.h>
#include <stdlib.h>

/* 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 command 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 */
GetCommState(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;

SetCommState(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;
}

Answer 3

这个。。。