CCS+C6678LE开发记录08:以太网接口测试示例之代码研究

本文是针对《CCS+C6678LE开发记录06:以太网接口测试》的后续研究。

在已经通过测试之后我想研究一下测试用例的实现原理，至少应该明白大致原理。

为了方便贴代码，我将原始实例的代码做了精简；

为了探索其原理，我修改/添加了少量代码。

主要代码如下

#include <stdio.h>#include <ti/ndk/inc/netmain.h>#include <ti/sysbios/BIOS.h>#include <ti/sysbios/knl/Task.h>#include <xdc/runtime/Error.h>#include <xdc/runtime/System.h>#include "ti/platform/platform.h"#include "ti/platform/resource_mgr.h"static int counter=0;static HANDLE hHello=0;char *HostName    = "TMS320C6678";char *LocalIPAddr = "169.254.11.119";   // My PC Local IPchar *LocalIPMask = "255.255.255.0";    // Not used when using DHCPchar *GatewayIP   = "192.168.2.101";    // Not used when using DHCPchar *DomainName  = "demo.net";         // Not used when using DHCPchar *DNSServer   = "0.0.0.0";          // Used when set to anything but zeroUint8 clientMACAddress[6] = {0x01, 0x02, 0x03, 0x04, 0x0C, 0xEF}; /* MAC Addr */static void   NetworkOpen();static void   NetworkClose();static void   NetworkIPAddr(IPN IPAddr, uint IfIdx, uint fAdd);extern int    dtask_udp_hello();void EVM_init(){printf("\nEVM_Init()\n");platform_init_flags   sFlags;platform_init_config  sConfig;memset( (void *) &sFlags,  0, sizeof(platform_init_flags));memset( (void *) &sConfig, 0, sizeof(platform_init_config));sFlags.pll  = 0;  /* PLLs for clocking  */sFlags.ddr  = 0;  /* External memory    */sFlags.tcsl = 1;  /* Time stamp counter */sFlags.phy  = 1;  /* Ethernet           */sFlags.ecc  = 0;  /* Memory ECC         */sConfig.pllm = 0; /* Use libraries default clock divisor */platform_init(&sFlags, &sConfig);}Void Hello(UArg arg0, UArg arg1){while(1){printf("Hello\n");Task_sleep(2000);if(counter>=3) break;}}Void Test(UArg arg0,UArg arg1);int main(){Task_Handle task1 = Task_create(Test, NULL, NULL);Task_Handle task2 = Task_create(Hello, NULL, NULL);if (task1==NULL || task2==NULL){printf("Task_create() failed!\n");BIOS_exit(0);}BIOS_start();}Void Test(UArg arg0,UArg arg1){        QMSS_CFG_T qmss_cfg;        CPPI_CFG_T cppi_cfg;        uint32_t coreID = platform_get_coreid();        uint32_t master=(coreID==0)?1:0;        qmss_cfg.master_core = master;        qmss_cfg.max_num_desc = MAX_NUM_DESC;        qmss_cfg.desc_size = MAX_DESC_SIZE;        qmss_cfg.mem_region = Qmss_MemRegion_MEMORY_REGION0;        cppi_cfg.master_core = master;        cppi_cfg.dma_num = Cppi_CpDma_PASS_CPDMA;        cppi_cfg.num_tx_queues = NUM_PA_TX_QUEUES;        cppi_cfg.num_rx_channels = NUM_PA_RX_CHANNELS;        res_mgr_init_qmss(&qmss_cfg);        res_mgr_init_cppi(&cppi_cfg);        res_mgr_init_pass();        int rc = NC_SystemOpen( NC_PRIORITY_LOW, NC_OPMODE_INTERRUPT );        if( rc!=0 )        {        NC_SystemClose();        return;        }        HANDLE hCfg = CfgNew();        if( !hCfg )        {        NC_SystemClose();        return;        }        CfgAddEntry( hCfg,CFGTAG_SYSINFO,CFGITEM_DHCP_HOSTNAME,0,strlen(HostName),(UINT8*)HostName,0);CI_IPNET NA;bzero( &NA, sizeof(NA) );NA.IPAddr  = inet_addr(LocalIPAddr);NA.IPMask  = inet_addr(LocalIPMask);strcpy( NA.Domain, DomainName );NA.NetType = 0;        CfgAddEntry( hCfg, CFGTAG_IPNET, 1, 0,sizeof(CI_IPNET), (UINT8 *)&NA, 0 );CI_ROUTE RT;bzero( &RT, sizeof(RT) );RT.IPDestAddr = 0;RT.IPDestMask = 0;RT.IPGateAddr = inet_addr(GatewayIP);CfgAddEntry( hCfg, CFGTAG_ROUTE, 0, 0,sizeof(CI_ROUTE), (UINT8 *)&RT, 0 );IPN IPTmp = inet_addr(DNSServer);if( IPTmp ){CfgAddEntry( hCfg, CFGTAG_SYSINFO, CFGITEM_DHCP_DOMAINNAMESERVER,0, sizeof(IPTmp), (UINT8 *)&IPTmp, 0 );}        rc = DBG_WARN;        CfgAddEntry(hCfg,CFGTAG_OS,CFGITEM_OS_DBGPRINTLEVEL,CFG_ADDMODE_UNIQUE, sizeof(uint),(UINT8 *)&rc,0);        rc = 8192;        CfgAddEntry(hCfg,CFGTAG_IP,CFGITEM_IP_SOCKUDPRXLIMIT,CFG_ADDMODE_UNIQUE,sizeof(uint),(UINT8 *)&rc,0);        do        {            rc = NC_NetStart( hCfg, NetworkOpen, NetworkClose, NetworkIPAddr );        } while( rc > 0 );        CfgFree( hCfg );        NC_SystemClose();}static void NetworkOpen(){        hHello = DaemonNew( SOCK_DGRAM,0,7,dtask_udp_hello,OS_TASKPRINORM,OS_TASKSTKNORM,0,1);}static void NetworkClose(){        DaemonFree( hHello );}static void NetworkIPAddr( IPN IPAddr, uint IfIdx, uint fAdd ){        IPN IPTmp;        if( fAdd )  printf("Network Added: ");        else  printf("Network Removed: ");        IPTmp = ntohl( IPAddr );        printf("If-%d:%d.%d.%d.%d\n", IfIdx,    (UINT8)(IPTmp>>24)&0xFF,(UINT8)(IPTmp>>16)&0xFF,    (UINT8)(IPTmp>>8)&0xFF, (UINT8)IPTmp&0xFF );}int dtask_udp_hello( SOCKET s, UINT32 unused ){printf("TASK execution %d\n",++counter);        (void)unused;        struct timeval tv;        tv.tv_sec  = 3;        tv.tv_usec = 0;        setsockopt(s,SOL_SOCKET,SO_SNDTIMEO,&tv,sizeof(tv));        setsockopt(s,SOL_SOCKET,SO_RCVTIMEO,&tv,sizeof(tv));        struct sockaddr_in sin1;        int sz=sizeof(sin1);        int recvSize;        HANDLE hBuffer;        unsigned char* pBuf;        while(1)        {            recvSize=recvncfrom( s, (void**)&pBuf, 0, (PSA)&sin1, &sz, &hBuffer );            if(recvSize<=0) break;            sendto( s, pBuf, recvSize, 0, (PSA)&sin1, sz );            recvncfree( hBuffer );        }        // Since the socket is still open, return "1"        // (we need to leave UDP sockets open)        return 1;}

其中EVM_init()函数被设置为在main()函数之前执行，具体设置在一个*.cfg文件中，

部分内容如下

var Memory  =   xdc.useModule('xdc.runtime.Memory');var BIOS    =   xdc.useModule('ti.sysbios.BIOS');var Task    =   xdc.useModule('ti.sysbios.knl.Task');var HeapBuf =   xdc.useModule('ti.sysbios.heaps.HeapBuf');var Log     =   xdc.useModule('xdc.runtime.Log');//...省略...Program.sectMap["sharedL2"] = "DDR3"; Program.sectMap["systemHeap"] = "DDR3";Program.sectMap[".sysmem"]  = "DDR3";Program.sectMap[".args"]    = "DDR3";Program.sectMap[".cio"]     = "DDR3";Program.sectMap[".far"] = "DDR3";Program.sectMap[".rodata"] = "DDR3";Program.sectMap[".neardata"] = "DDR3";//...省略...Startup.lastFxns.$add('&EVM_init');BIOS.taskEnabled=   true;Ecm.eventGroupHwiNum[0] = 7;Ecm.eventGroupHwiNum[1] = 8;Ecm.eventGroupHwiNum[2] = 9;Ecm.eventGroupHwiNum[3] = 10;Global.IPv6 = true;

注意其中的

Startup.lastFxns.$add('&EVM_init');

在主函数中执行BIOS_start()会完成一些主动操作

（似乎是因为main函数在DSP中的地位和在PC上不一样）

总之，在执行完EVM_init()完成基本的初始化后，创建我们的主要任务：

Task_Handle task1 = Task_create(Test, NULL, NULL);
Task_Handle task2 = Task_create(Hello, NULL, NULL);

其中Hello任务只是为了演示一下，每隔2秒(sleep(2000))打印一个“Hello”字样

而Test任务则执行了QMSS、CPPI、PA等等的初始化，完成了基本网络配置

启动Network服务后，关联了dtask_udp_hello任务，等待以太网接口的连接

另一边使用PC执行测试，发送字符串进行交互。

因为我们的程序中设置了一个计数器counter

每次发送一个字符串，dtask_udp_hello()就执行一次,counter++

在Hello任务中，一旦发现条件counter>=3满足了就会退出while()循环，它的使命也就终结了

（注意并不是真的终结，因为没有执行KillTask这样的命令，只是Hello任务不再执行任何操作罢了）

这样只剩下Test任务独自运行了

某次测试如下

本文原创，博文地址

http://blog.csdn.net/fengyhack/article/details/43304505