采用TCP协议的PIC32MZ ethernet bootloader

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　　趁热打铁，在上一PIC32MZ UDP ethernet bootloader的基础上我又完成了采用TCP协议的PIC32MZ ethernet bootloader。两款ethernet bootloader基本架构都一样，数据包格式也一样。TCP ethernet bootloader 也分两部分，我将他们命名为PhnLoader_v4.0和PhnBoot_v4.0。

     PhnLoader_v4.0

　　PhnLoader_v4.0 是PC端host 程序。

      运行环境：Window + .NET Framework 4.5

      开发语言：C#

      通信类型：TCP Server

      IP 地址： 192.168.1.105

      端口号：  8720

　　UI 如下：

　　主要代码如下：

            try
            {
                while (loaderReader.Peek() >= 0)
                {
                    pBarLoading.PerformStep();
                    recordLine = loaderReader.ReadLine();

                    if (recordLine.Contains(EXTEND_TOKEN) == true)
                    {
                        if (recordLine.Contains(USER_ID_TOKEN) == true)
                        {
                            isNextLineUserID = true;
                            continue;
                        }
                        //else if (recordLine.Contains(CONFIG_BITS_TOKEN) == true)
                        //{
                        //    const int ADDR_U_START_INDEX = 9;
                        //    const int ADDR_U_LENGTH = 4;
                        //    string addrU = recordLine.Substring(ADDR_U_START_INDEX, ADDR_U_LENGTH);
                        //    loaderUpperAddr = Convert.ToInt32(addrU, 16) << 16;
                        //    isNextLineConfigBits = true;
                        //    continue;
                        //}
                        else if (recordLine.Contains(PIC32_CONFIG_BITS_TOKEN) == true)
                        {
                            const int ADDR_U_START_INDEX = 9;
                            const int ADDR_U_LENGTH = 4;
                            string addrU = recordLine.Substring(ADDR_U_START_INDEX, ADDR_U_LENGTH);
                            loaderUpperAddr = Convert.ToInt32(addrU, 16) << 16;
                            isNextLineConfigBits = true;
                            continue;
                        }
                        else
                        {
                            const int ADDR_U_START_INDEX = 9;
                            const int ADDR_U_LENGTH = 4;
                            string addrU = recordLine.Substring(ADDR_U_START_INDEX, ADDR_U_LENGTH);
                            loaderUpperAddr = Convert.ToInt32(addrU, 16) << 16;
                            continue;
                        }
                    }
                    else if (recordLine.Contains(END_OF_HEX_FILE_TOKEN) == true)
                    {
                        break;
                    }
                    if (isNextLineUserID)
                    {
                        isNextLineUserID = false;
                        // do nothing;
                    }
                    else if (isNextLineConfigBits)
                    {
                        if (!DownloadConfigLine(recordLine))
                        {
                            Debug.WriteLine("Error found during configuration bits programming");
                            loaderReader.Close();
                            loaderServer.Close();
                            btnDownload.Enabled = true;
                            return;
                        }
                        isNextLineConfigBits = false;
                    }
                    else
                    {
                        if (!DownloadDataLine(recordLine))
                        {
                            Debug.WriteLine("Error found during data programming");
                            loaderReader.Close();
                            loaderServer.Close();
                            btnDownload.Enabled = true;
                            return;
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                Debug.WriteLine("Error: " + ex.Message);
                textBoxStatus.ForeColor = Color.Red;
                textBoxStatus.AppendText("Downloading failed
");
                textBoxStatus.ForeColor = Color.Black;
                loaderServer.Close();
                loaderReader.Close();
                btnDownload.Enabled = true;
                return;
            }
            textBoxStatus.AppendText("Downloading completed
");

　　PhnBoot_v4.0

　　PhnBoot_v4.0 是单片机端Boot 程序。

      运行环境：PIC32MZ EC Starter Kit

      开发语言：C 语言 （Microchip XC32 free）

      通信类型：TCP Client

      IP 地址： 192.168.1.123

      端口号：  随机生成

　　主要代码段：

switch (GenTCPSt)
        {
        case SM_HOME:
            ARPResolve(&ServerNode.IPAddr);
            startTime = TickGet();
            GenTCPSt++;
            break;
        case SM_ARPed:
            if (TickGet() - startTime < 4*TICK_SECOND)
            {
                if (ARPIsResolved(&ServerNode.IPAddr,&ServerNode.MACAddr))
                {
                    MySock = TCPOpen((DWORD)&ServerNode,TCP_OPEN_NODE_INFO,REMOTE_SERVER_PORT,0);
                    startTime = TickGet();
                    GenTCPSt++; 
                }
            }
            else
            {
                GenTCPSt = SM_HOME;
            }
            break;
        case SM_OPENed:
            if (TickGet() - startTime < TICK_SECOND)
            {
                if (MySock != INVALID_SOCKET)
                {
                    startTime = TickGet();
                    GenTCPSt++;
                }
            }
            else
            {
                GenTCPSt = SM_HOME;
            }
            break;
        case SM_TCPPUT:
            if (TickGet() - startTime < 4*TICK_SECOND)
            {
                if (TCPIsConnected(MySock))
                {
                    TCPPutString(MySock,ok);
                    TCPFlush(MySock);
                    GenTCPSt++;
                }
            }
            else
            {
                GenTCPSt = SM_CLOSE;
            }
            break;
        case SM_TCPGET:
            if (TickGet() - startTime < 10*TICK_SECOND)
            {
                tcpPackets = TCPIsGetReady(MySock);
                if (tcpPackets >= BUFFER_MAX)
                {
                   TCPGetArray(MySock,frameBuffer,BUFFER_MAX);
                   if (!TCPIsGetReady(MySock)) TCPDiscard(MySock);  //take care of packet splicing
                   if (frameBuffer[0] == STX && frameBuffer[BUFFER_MAX - 1] == ETX)
                   {
//                    for(i=0;i<BUFFER_MAX;i++)
//                    {
//                        printf("%02x",frameBuffer[i]);
//                    }
//                    printf("
");
                    switch (frameBuffer[CMD_INDEX])
                    {
                    case WR_MEM:
                        //printf("<");
                        SourceAddr.byte.LB = frameBuffer[ADDRL_INDEX];
                        SourceAddr.byte.HB = frameBuffer[ADDRH_INDEX];
                        SourceAddr.byte.UB = frameBuffer[ADDRU_INDEX];
                        SourceAddr.byte.MB = frameBuffer[ADDRM_INDEX];
                        int ix;
                        for (ix=0;ix<frameBuffer[LEN_INDEX];)
                        {
                        pData.byte.LB = frameBuffer[LEN_INDEX+1+ix++];
                        pData.byte.HB = frameBuffer[LEN_INDEX+1+ix++];
                        pData.byte.UB = frameBuffer[LEN_INDEX+1+ix++];
                        pData.byte.MB = frameBuffer[LEN_INDEX+1+ix++];
                        NVMWriteWord(SourceAddr.Val, pData.Val);
                        SourceAddr.Val += 4;
                        }
                        break;
                     case WR_CFG:
                        break;
                     case ER_MEM:
                        for (EraseAddr.Val = ERASE_FLASH_BASE_ADDRESS; EraseAddr.Val < ERASE_FLASH_END_ADDRESS;)
                        {
                            NVMErasePage(EraseAddr.Val);
                            EraseAddr.Val += PAGE_SIZE;
                        }
                        break;
                     case RUN_APP:
                        GenTCPSt = SM_CLOSE;
                        break;
                     default:
                        break;
                    } 
                    startTime = TickGet();
                    if (GenTCPSt == SM_TCPGET) GenTCPSt = SM_RESPONCE;
                  }
                }
            }
            else
            {  
                GenTCPSt = SM_CLOSE;
            }
            break;
        case SM_RESPONCE:
            if (TickGet() - startTime < 10*TICK_SECOND)
            {
                if (TCPIsPutReady(MySock) >= BUFFER_MAX)
                {
                    Uart_Putc('.');
                    TCPPutArray(MySock, frameBuffer, BUFFER_MAX);
                    TCPFlush(MySock);
                }
                startTime = TickGet();
                GenTCPSt = SM_TCPGET;
            }
            else
            {
                printf("xx");      // for debug
                GenTCPSt = SM_CLOSE;
            }
            break;
        case SM_CLOSE:
            printf("done
");        // for debug
            TCPDisconnect(MySock);
            MySock = INVALID_SOCKET;
            GenTCPSt = SM_HOME;
            TRISCSET = 0x2000; // RC13 Input
            LATCCLR = 0x6000;  // Clear LATC 
            LATHCLR = (1<<2);
            TRISHSET = (1<<2);
            INTDisableInterrupts();
            T1CON = 0;
            IEC0CLR = _IEC0_T1IE_MASK;
            ETHCON1 = 0;
            ETHCON2 = 0;
            CoreT_DelayMs(1);
            U1MODE = 0x0;
            U1STA = 0x0;
            (*((void(*)(void))USER_APP_RESET_ADDRESS))();
            break;
        }
    }

　　如何使用PhnLoader_v4.0和PhnBoot_v4.0

      1. 使用XC32编译PhnBoot_v4.0（编译前，需先修改linker script, 需要设置Optimization level为1）。

　　2. 使用pickit3烧录PhnBoot_v4.0的Hex文件到目标板中。

　　3. 拔除pickit3烧录器

　　4. 连接目标板和PC到同一局域网，设置PC的IP地址，打开PhnLoader_v4.0，选择TCP协议，端口号，IP地址。

　　5. 点击PhnLoader_v4.0用户界面上的“.."按钮加载需要烧录的应用程序Hex文件（编译前，需先修改linker script）

　　6. 重启目标板，等到LED3 灯亮了，立刻在PhnLoader_v4.0界面上点击Download按钮。如果超时未点击Download按钮，会自动跳转到上次烧录的应用程序中去。

　　7. 烧录完毕，再次重启目标板, 数秒后目标板开始正常运行应用程序。

　　之后每次更新应用程序，只需重复步骤 4 ~ 7 就可以了。注意，整个烧录过程未能实现User ID/Configuration Bits的烧写，所以需要保持应用程序的Configuration Bits和Bootloader的Configuration Bits一致。