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，
一直觉得人应该去旅行，在年轻的时候，
