DSP C6455与上位机实现UDP数据传输

本文主要实现DSP TMSC6455与上位机（平台：Qt）UDP传输数据。刚开始，尝试将NDK提供的Helloworld例程跑通。需要配置的文件均配置好，可以编译通过，但是将out文件load之后，运行不对，始终接收不到数据。后来我参考链接（http://e2e.ti.com/support/processors/f/791/t/365786）将UDP配置部分加入到自己原来的工程中，可以实现双向通讯了。也见网上有网友讲，Helloworld例程无法正常运行，是缺少TaskSleep(1)。没有实际验证。在此，记录下必要的配置步骤。

（一）CCS中相关配置

1、找到主函数main所在文件，例如helloWorld.c，将下面这句代码注释掉。

 hHello = DaemonNew( SOCK_DGRAM, 0, 7, dtask_udp_hello, OS_TASKPRINORM, OS_TASKSTKNORM, 0, 1 ); 

2、在工程中新建网络传输数据任务int sendUDPTsk()

如果工程中已经创建网络通讯任务，可以直接将下面代码更改到自己的函数中。

#include <netmain.h>
SOCKET   socksend = INVALID_SOCKET;

unsigned char RecevOK=0;
static int SendNum = 0;
static int RecevNum = 0;
unsigned char send_buff[100] = {0};//设置缓存区大小
unsigned char *recev_buff;

void sendUDPTsk()
{
    struct   sockaddr_in sinData, cliAddr, tmpAddr;
    int cliAddr_size = 0, err = 0;
    int actual_send_size = 0, send_buff_size = 0, i = 0, chain = 0;
    int actual_recv_size = 0,recv_buff_size = 0;
    int tmp;
	
    //变量初始化
    RecevOK=0;
    //将接收的数据存储到指定地址上
    recev_buff = (unsigned char *)0xe0000000;	

    // Allocate the file environment for this task
    fdOpenSession( TaskSelf() );
	
    //Initialize the socket
    //注意：UDP传输时，此处一定配置为SOCK_DGRAM
    socksend  = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
    if (socksend == INVALID_SOCKET)
    {
	printf(" socket(socksend) failed \n");
	goto leave;
    }
	
    err = setsockopt( socksend, SOL_SOCKET, SO_REUSEADDR, send_buff, sizeof(send_buff) );
    err = setsockopt( socksend, SOL_SOCKET, SO_REUSEPORT, send_buff, sizeof(send_buff) );

    //Initialize socket address in structure，服务器端配置
    bzero( &sinData, sizeof(struct sockaddr_in) );
    sinData.sin_family = AF_INET;
    sinData.sin_len    = sizeof( sinData );
    sinData.sin_addr.s_addr = INADDR_ANY;
    sinData.sin_port = htons(5000);

    //Bind the socket
    err = bind (socksend, (struct sockaddr *)&sinData, sizeof(sinData));
    if(err == 0)
	printf("Send-Bind operation successfully done\n");
    else
    {
	printf("Send-Bind operation failed errno= %d\n", fdError());
	goto leave;
    }
    //客户端配置，为服务器端指定客户端的IP地址和端口号
    bzero( &cliAddr, sizeof(struct sockaddr_in) );
    cliAddr.sin_family = AF_INET;
    cliAddr.sin_len    = sizeof( cliAddr );
    cliAddr.sin_addr.s_addr = inet_addr("192.168.0.10"); //Target IP(PC IP address)
    cliAddr.sin_port = htons(5000);
	
    cliAddr_size = sizeof(struct sockaddr_in);
    tmp = sizeof( struct sockaddr_in );
    //设置发送缓存区大小
    send_buff_size = 100; 
    //设置接收缓存区大小
    recv_buff_size = 3000;
	
    //一直循环，等待接收或者发送数据信号
    while(1)
    {
    memset(send_buff, '1', 100);
    /////////发送数据		
    if(RecevOK)
    {
        //发送数据
	actual_send_size = sendto(socksend, send_buff, send_buff_size, 0, (struct sockaddr *)&cliAddr, cliAddr_size);
	if(actual_send_size < 0)
	    printf(" Error Sending sendto() %d \n", fdError());
	else
	{
	    printf(" %d.Send_Size = %d \n ", SendNum,actual_send_size);
	    SendNum++;
	}
	    RecevOK=0;
    }
    /////////接受数据
    else
    {
        //接收数据
	actual_recv_size = recvfrom(socksend, recev_buff, recv_buff_size, 0, (struct sockaddr *)&tmpAddr, &tmp);
	if (actual_recv_size<0)				
	    printf(" Error Receiving recvfrom() %d \n", fdError());
	else 
	{
	    RecevNum++;
	    printf(" %d.actual_recv_size = %d \n ", RecevNum,actual_recv_size);
	    RecevOK = 1;
	}
    }
	TaskSleep(1);
}

leave:
    printf("tskNetwork Fatal Error\n");

    // This task is killed by the system - here, we block
    TaskBlock(TaskSelf());
 }

3、Qt中配置

见上篇博客：《QT UDP数据传输》

链接：https://blog.csdn.net/weixin_38621214/article/details/86539570

参考链接：http://e2e.ti.com/support/processors/f/791/t/365786