Question

我为一个学校项目建造了一台cnc机器，它由一个带有屏蔽的英特尔伽利略控制步进电机，这是由一台Windows机器上的程序控制的（Windows 7），该程序基本上是什么是读取包含gcode的文本文件，然后逐行将其发送到Galileo，然后Galileo将该行分解为坐标和指令，将主轴移动到需要去的位置，当指令完成时发送它一条消息通过串口告诉它已完成，计算机然后发送下一行代码并重复该过程。

到目前为止，我可以阅读gcode文件并逐行发送（使用按键发送每一行）到伽利略，一切正常。我的问题是从伽利略读书我尝试了几种没有快乐的方法。这是我认为最接近我应该做的事情。我不会发布整个源代码，因为我认为它只是要阅读，我发布了main（），其中包含所有设置函数和应该读取序列的函数。

/************************************************************************************************************
application for controling galileo or arduino cnc machine
by brendan scullion
10/11/2014
**********************************************************************************************************/
#include <string.h>
#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <time.h>
#include <ctype.h>
#include <conio.h>
#include "functions.h"

int main()
{
system("COLOR 1F");

// Declare variables and structures
unsigned char text_to_send[MAX_PATH];
unsigned char digits[MAX_PATH];
int baudrate = 19200;
int dev_num = 50;
char dev_name[MAX_PATH];
HANDLE hSerial;
HANDLE screen = GetStdHandle(STD_OUTPUT_HANDLE);
DCB dcbSerialParams = {0};
COMMTIMEOUTS timeouts = {0};

 printf("Searching serial ports...\n");
while(dev_num >= 0)
{
    printf("\r                        ");
    printf("\rTrying COM%d...", dev_num);
    sprintf(dev_name, "\\\\.\\COM%d", dev_num);
    hSerial = CreateFile(
                    dev_name,
                    GENERIC_READ|GENERIC_WRITE,
                    0,
                    NULL,
                    OPEN_EXISTING,
                    FILE_ATTRIBUTE_NORMAL,
                    NULL );
    if (hSerial == INVALID_HANDLE_VALUE) dev_num--;
    else break;
}

if (dev_num < 0)
{
    printf("No serial port available\n");
    return 1;
}

printf("OK\n");

// Set device parameters (38400 baud, 1 start bit,
// 1 stop bit, no parity)
dcbSerialParams.DCBlength = sizeof(dcbSerialParams);
if (GetCommState(hSerial, &dcbSerialParams) == 0)
{
    printf("Error getting device state\n");
    CloseHandle(hSerial);
    return 1;
}
//dcbSerialParams.BaudRate = CBR_38400;
dcbSerialParams.BaudRate = baudrate;
dcbSerialParams.ByteSize = 8;
dcbSerialParams.StopBits = ONESTOPBIT;
dcbSerialParams.Parity = NOPARITY;
if(SetCommState(hSerial, &dcbSerialParams) == 0)
{
    printf("Error setting device parameters\n");
    CloseHandle(hSerial);
    return 1;
}
// Set COM port timeout settings
timeouts.ReadIntervalTimeout = 1;
timeouts.ReadTotalTimeoutConstant = 1;
timeouts.ReadTotalTimeoutMultiplier = 10;
timeouts.WriteTotalTimeoutConstant = 50;
timeouts.WriteTotalTimeoutMultiplier = 10;
if(SetCommTimeouts(hSerial, &timeouts) == 0)
{
    printf("Error setting timeouts\n");
    CloseHandle(hSerial);
    return 1;
}

char *cmd = NULL;
char *para1 = NULL;
char *para2 = NULL;
char *para3 = NULL;

char comPort[10];
float baudRate;
int keepGoing = 1;
unsigned char message[MAX_STRING_LENGHT];
//*********************************************************************************************************************

char cmdLine[200];
heading();
while(keepGoing == 1)
{
    printf(">>");
    gets(cmdLine);
    cmd = strtok(cmdLine, " ");

    if(cmd!=false)
    {
        if(cmd != NULL)
        {
            para1 = strtok(NULL, " ");
        }
        else if(para1 != NULL)
        {
           para2 = strtok(NULL, " ");
        }
        else if(para2 != NULL)
        {
            para3 = strtok(NULL, " ");
        }
        if(strcmp(cmd, "help")== 0)
        {
            help();
        }
        else if(strcmp(cmd, "comset")== 0)
        {
            setupComs(comPort, baudRate);
        }
        else if(strcmp(cmd, "getg")== 0)
        {
            getgcode(hSerial,text_to_send,dev_name);
        }
        else if(strcmp(cmd, "readserial")== 0)
        {
            read_serial(hSerial, message, dev_name);
        }
        else if(strcmp(cmd, "offset")==0)
        {
            getOffset(hSerial, text_to_send, dev_name);
        }
        else if(strcmp(cmd, "setup") == 0)
        {
            setup(hSerial, text_to_send, dev_name);
        }

        else if(strcmp(cmd, "exit") == 0)
        {
            keepGoing = 0;
        }
        else
        {
            printf("Unknown command!\n");
        }
        printf("\n");
    }
}
// Close serial port
printf("Closing serial port...");
if (CloseHandle(hSerial) == 0)
{
    printf("Error\n");
    return 1;
}
printf("OK\n");
return 0;
}

和阅读功能

void read_serial(HANDLE hComm, HANDLE screen, char *message, char *devName )
{

    char buffer[MAX_STRING_LENGHT];
    unsigned char ch;
    DWORD bytes_recieved = MAX_STRING_LENGHT, written = 0;
    strcpy(buffer,""); //empty buffer
    strcpy(buffer,"");

    while(buffer!=NULL){ // wait untill serail message revieved
        ReadFile(hComm, &buffer,sizeof(buffer), // read serial
                &bytes_recieved, NULL );
        if(bytes_recieved){                // if something to read
            WriteFile(screen, buffer, bytes_recieved, &written, NULL);
            strcpy(message, buffer);
            printf("%s", message);
            if(kbhit()){
                ch = getch();
                if(ch== 'q')
                    break;
            }
        }
    }
}

我可以发布完整的源代码，如果有人想看看它

Answer 1

在read_serial中，您可以尝试在调用ReadFile时用缓冲区替换＆amp; buffer。字符数组的名称应该是指向数组第一个元素的指针。

Answer 2

我会做的是用简单实用的协议构建来自Galileo板的每条消息。例如，我将使用STX和ETX来构建帧，并通过串口将消息从Windows 7发送到电路板，使用ACK NAK确认收到的数据包，并使用SYN在Galileo上发送一行信号。使用上述框架，您可以构建接收和发送功能，您可以等待特定字符（ETX，STX，SYN，ACK等），并在拥有完整帧或控制字符后退出。

从串行端口（到intel galileo）窗口c写入和读取数据

2 个答案: