Question

我用C ++编写程序，与没有提供GUI的DLP Lightcrafter（德州仪器）建立通信，我已经使用这些指令建立连接：

#include <stdlib.h>
#include <string.h>
#include <iostream> /* cout */
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h> /* socket struct */
#include <arpa/inet.h> /* ip, etc */
#include <unistd.h> /* read() write() for socket */
#include <cstdint>
#include "PKT.h" /* calcChecksum() */

using namespace std;

/* Packet format
 * ------------------------------------------------------------------------------------
 * |                        HEADER                       |       DATA      | CHECKSUM |
 * ------------------------------------------------------------------------------------
 * | Byte 0 | Byte 1 | Byte 2 | Byte 3 | Byte 4 | Byte 5 | Byte 6...Byte N | Byte N+1 |
 * ------------------------------------------------------------------------------------
 * |Pkt type| CMD 1  | CMD 2  | Flags  | Payload length  |  Data payload   | Checksum |
 * ------------------------------------------------------------------------------------ */

int main ()
{
  enum Type{BUSY, ERROR, WRITE, WRITE_RESP, READ, READ_RESP};
  enum Flag{SINGLE, FIRST, MID, LAST};
  enum CurDispMode{STATIC,INTERNAL_PAT,HDMI,RESERVED,PATTERN_SEQ};
  enum CurTestPat{CHECKERBOARD_14X8,SOLID_BLACK,SOLID_WHITE,SOLID_GREEN,SOLID_BLUE,SOLID_RED,VERT_LINES_1W7B,HORIZ_LINES_1W7B,VERT_LINES_1W1B,HORIZ_LINES_1W1B,DIAG_LINES,VERT_GRAY_RAMPS,HORIZ_GRAY_RAMPS,CHECKERBOARD_4X4};
  enum PKT_Size{HEADER=6, MAX=0xFFFF, CHECK=1};

  char ip[] = "192.168.1.100";
  int *pkt=new int [HEADER+MAX+CHECK];
  unsigned int data_length, pkt_length;
  unsigned int cmd_CurDispMode=0x0101; 
  unsigned int cmd_CurTestPat=0x0103;

  /* Socket Structure */    
  struct sockaddr_in sa;
  sa.sin_family=AF_INET;
  sa.sin_addr.s_addr=inet_addr(ip);
  sa.sin_port = htons(0x5555);
  int s = socket(AF_INET,SOCK_STREAM,0);

  /* Attempt to Establish Connection */
  if (connect(s,(sockaddr*) &sa,sizeof(sa))!=-1){
    cout<<"Connected."<<endl;
    cout<<" "<<endl;

    usleep(1000000);

    /* #################################### */
    /* Request to Display SOLID BLUE SCREEN */
    /* #################################### */   
    data_length=1;

    if(data_length>MAX)
      return -1;

    /* First instruction - set test pattern mode */
    pkt[0]=WRITE;
    pkt[1]=(cmd_CurDispMode >> 8) & 0xFF;
    pkt[2]=(cmd_CurDispMode) & 0xFF;
    pkt[3]=SINGLE;
    pkt[4]=data_length & 0xFF;
    pkt[5]=(data_length >> 8) & 0xFF;
    pkt[6]=INTERNAL_PAT;
    pkt[HEADER+data_length]=calcChecksum(HEADER+data_length, pkt);

    pkt_length=HEADER+data_length+CHECK;

    if(send(s,(const void *)pkt,(size_t) pkt_length,0) != pkt_length){
      cout<<"PKT writing failed."<<endl;
      return -1;}
    cout<<pkt[0]<<" "<<pkt[1]<<" "<<pkt[2]<<" "<<pkt[3]<<" "<<pkt[4]<<" "<<pkt[5]<<" "<<pkt[6]<<" "<<pkt[7]<<endl;

    /* Retrieves answer from DLP */
    if(recv(s,(void *)pkt,(size_t)HEADER,0) != HEADER){
      cout<<"CMD reading failed."<<endl;
      return -1;}

    /* New Data Length */
    data_length = pkt[4] | pkt[5] << 8;

    /* Retrieves Data & CHECKSUM */
    if(recv(s,(void *)(pkt+HEADER),(size_t)(data_length+1),0) != data_length+1){
      cout<<"Payload reading failed."<<endl;
      return -1;}
    cout<<pkt[0]<<" "<<pkt[1]<<" "<<pkt[2]<<" "<<pkt[3]<<" "<<pkt[4]<<" "<<pkt[5]<<" "<<pkt[6]<<" "<<pkt[7]<<endl;

    /* CHECKSUM */
    if(pkt[data_length+HEADER] != calcChecksum(data_length+HEADER,pkt)){
      cout<<"Checksum Error"<<endl;
      return -1;}

    data_length=1;
    /* Second instruction - display pattern 0x05 */
    pkt[0]=WRITE;
    pkt[1]=(cmd_CurTestPat >> 8) & 0xFF;
    pkt[2]=(cmd_CurTestPat) & 0xFF;
    pkt[3]=SINGLE;
    pkt[4]=data_length & 0xFF;
    pkt[5]=(data_length >> 8) & 0xFF;
    pkt[6]=SOLID_BLUE;
    pkt[HEADER+data_length]=calcChecksum(HEADER+data_length, pkt);

    if(send(s,(const void  *)pkt,(size_t)pkt_length,0) != pkt_length){
      cout<<"PKT writing failed."<<endl;
      return -1;}

    /* Retrieves answer from DLP */
    if(recv(s,(void *)pkt,(size_t)HEADER,0) != HEADER){
      cout<<"CMD reading failed."<<endl;
      return -1;}

    /* New Data Length */
    data_length = pkt[4] | pkt[5] << 8;

    /* Retrieves Data */
    if(recv(s,(void *)(pkt+HEADER),(size_t)(data_length+1),0) != data_length+1){
      cout<<"Payload reading failed."<<endl;
      return -1;}
    cout<<pkt[HEADER]<<" "<<pkt[HEADER+1]<<endl;

    /* CHECKSUM */
    if(pkt[data_length+HEADER] != calcChecksum(data_length+HEADER,pkt)){
      cout<<"Checksum Error"<<endl;
      return -1;}

    if(pkt[0] != WRITE_RESP){
      cout<<"CMD Failed."<<endl;
      return -1;}

    if(pkt[3]==LAST)
      cout<<"CMD Success."<<endl;
    /* ############## */
    /* End of Request */
    /* ############## */

    usleep(9000000);

    if(!close(s))
      cout<<"Disconnected."<<endl;
  }

  else
    cout<<"Connection failed."<<endl;

  delete [] pkt;

  return 0;

}

当我尝试连接到主板时，它成功了，但是当我发送命令时，我只会收到错误。我无法在发送命令或命令本身的方式中发现错误，因为我并不真正理解套接字的工作方式，我想也许就是这样。这个问题......有什么想法吗？

由于

编辑：

我编辑了代码以包含一组指令的示例。与具有8位组件的DLP向量通信被发送。第一个位置定义它是什么类型的数据包; 第二和第三位置是要给出的命令的MSB和LSB; 第四个位置是一个标志，告诉数据包中的数据是否完整，或者是否要用其他数据包中的数据进行编译; Fith和第六个位置是数据长度的LSB和MSB; 第七至第N位置用于数据; （N + 1）th用于校验和[(sum through the N elements)&0xFF]。

我知道我收到错误，因为当我收到DLP的响应时，数据包类型为1（错误），并且数据与文档中提供的错误代码一致。

编辑2：问题解决了，问题与变量类型有关，而不是套接字。

从sys / socket.h

0 个答案: