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为了方便贴代码，将原始实例的代码做了精简；
为了探索其原理，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 IP
char *LocalIPMask = "255.255.255.0"; // Not used when using DHCP
char *GatewayIP = "192.168.2.101"; // Not used when using DHCP
char *DomainName = "demo.net"; // Not used when using DHCP
char *DNSServer = "0.0.0.0"; // Used when set to anything but zero
Uint8 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
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