一、回环测试函数的实现，如下面的代码，主函数while循环中调用下面的函数loop_back
1 void loop_back(void) 2 { 3 int32_t ret = 0; 4 5 /* Loopback Test */ 6 // TCP server loopback test 7 if( (ret = loopback_tcps(SOCK_TCPS, gDATABUF, 5000)) < 0) { 8 printf("SOCKET ERROR : %ld\r\n", ret); 9 } 10 // UDP server loopback test 11 if( (ret = loopback_udps(SOCK_UDPS, gDATABUF, 3000)) < 0) { 12 printf("SOCKET ERROR : %ld\r\n", ret); 13 } 14 }
1 int32_t loopback_tcps(uint8_t sn, uint8_t* buf, uint16_t port) 2 { 3 int32_t ret; 4 uint16_t size = 0, sentsize=0; 5 6 #ifdef _LOOPBACK_DEBUG_ 7 uint8_t destip[4]; 8 uint16_t destport; 9 #endif 10 11 switch(getSn_SR(sn)) 12 { 13 case SOCK_ESTABLISHED : //Success to connect 14 if(getSn_IR(sn) & Sn_IR_CON) 15 { 16 #ifdef _LOOPBACK_DEBUG_ 17 getSn_DIPR(sn, destip); //获取客户端的ip地址 18 destport = getSn_DPORT(sn); //获取客户端的端口号 19 20 printf("%d:Connected - %d.%d.%d.%d : %d\r\n",sn, destip[0], destip[1], destip[2], destip[3], destport); 21 #endif 22 setSn_IR(sn,Sn_IR_CON);//设置socket的连接中断标志位 23 } 24 if((size = getSn_RX_RSR(sn)) > 0) // Don\'t need to check SOCKERR_BUSY because it doesn\'t not occur. 25 { 26 if(size > DATA_BUF_SIZE) size = DATA_BUF_SIZE; 27 ret = recv(sn, buf, size); 28 29 if(ret <= 0) return ret; // check SOCKERR_BUSY & SOCKERR_XXX. For showing the occurrence of SOCKERR_BUSY. 30 size = (uint16_t) ret; 31 sentsize = 0; 32 33 while(size != sentsize) 34 { 35 ret = send(sn, buf+sentsize, size-sentsize); 36 if(ret < 0) 37 { 38 close(sn); 39 return ret; 40 } 41 sentsize += ret; // Don\'t care SOCKERR_BUSY, because it is zero. 42 } 43 } 44 break; 45 case SOCK_CLOSE_WAIT : //Closing state 46 #ifdef _LOOPBACK_DEBUG_ 47 //printf("%d:CloseWait\r\n",sn); 48 #endif 49 if((ret = disconnect(sn)) != SOCK_OK) return ret; 50 #ifdef _LOOPBACK_DEBUG_ 51 printf("%d:Socket Closed\r\n", sn); 52 #endif 53 break; 54 case SOCK_INIT : //Initiate state 55 #ifdef _LOOPBACK_DEBUG_ 56 printf("%d:Listen, TCP server loopback, port [%d]\r\n", sn, port); 57 #endif 58 if( (ret = listen(sn)) != SOCK_OK) return ret; 59 break; 60 case SOCK_CLOSED: //Closed 61 #ifdef _LOOPBACK_DEBUG_ 62 //printf("%d:TCP server loopback start\r\n",sn); 63 #endif 64 if((ret = socket(sn, Sn_MR_TCP, port, 0x00)) != sn) return ret; 65 #ifdef _LOOPBACK_DEBUG_ 66 //printf("%d:Socket opened\r\n",sn); 67 #endif 68 break; 69 default: 70 break; 71 } 72 return 1; 73 }
1 int32_t loopback_udps(uint8_t sn, uint8_t* buf, uint16_t port) 2 { 3 int32_t ret; 4 uint16_t size, sentsize; 5 uint8_t destip[4]; 6 uint16_t destport; 7 8 switch(getSn_SR(sn)) 9 { 10 case SOCK_UDP : 11 if((size = getSn_RX_RSR(sn)) > 0) 12 { 13 if(size > DATA_BUF_SIZE) size = DATA_BUF_SIZE; 14 ret = recvfrom(sn, buf, size, destip, (uint16_t*)&destport); 15 if(ret <= 0) 16 { 17 #ifdef _LOOPBACK_DEBUG_ 18 printf("%d: recvfrom error. %ld\r\n",sn,ret); 19 #endif 20 return ret; 21 } 22 size = (uint16_t) ret; 23 sentsize = 0; 24 while(sentsize != size) 25 { 26 ret = sendto(sn, buf+sentsize, size-sentsize, destip, destport); 27 if(ret < 0) 28 { 29 #ifdef _LOOPBACK_DEBUG_ 30 printf("%d: sendto error. %ld\r\n",sn,ret); 31 #endif 32 return ret; 33 } 34 sentsize += ret; // Don\'t care SOCKERR_BUSY, because it is zero. 35 } 36 } 37 break; 38 case SOCK_CLOSED: 39 #ifdef _LOOPBACK_DEBUG_ 40 //printf("%d:UDP loopback start\r\n",sn); 41 #endif 42 if((ret = socket(sn, Sn_MR_UDP, port, 0x00)) != sn) 43 return ret; 44 #ifdef _LOOPBACK_DEBUG_ 45 printf("%d:Opened, UDP loopback, port [%d]\r\n", sn, port); 46 #endif 47 break; 48 default : 49 break; 50 } 51 return 1; 52 }
二、下载程序开始测试测试
1.初始化后打印w5500相关信息
2.UDP回环测试，可以看到可以正常的从w5500的IP地址为192.168.1.123：3000端口用UDP的方式收到数据
3.TCP回环测试，可以看到可以正常的从w5500的IP地址为192.168.1.123：5000端口用TCP的方式收到数据
至此回环测试调试完成！下一次准备把freemodbus tcp的功能移植过来，小伙伴们期待一下吧！<_>