采用UDP协议的PIC32MZ ethernet bootloader

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  经过千辛万苦,今天终于完工PIC32MZ EC Starter Kit的ethernet bootloader项目。我将整个项目, 命名为PhnBootloader。它分为两个部分。第一个部分是PC 端的host程序PhnLoader_v3.0。另一部分是单片机端boot程序PhnBoot_v3.0,是从Microchip AN1388 ethernet bootloader移植过来的。整个移植过程碰到很多困难,主要是由于ethernet bootloader使用到Microchip 的TCP/IP Stack,但是TCP/IP Stack不支持PIC32MZ。 这里我列出移植需要注意的地方:

1. PIC32MZ默认enable cache.

2. PIC32MZ ethernet module ports mapping

3. PIC32MZ EC Starter Kit的external PHY的LEDs和Start Kit的LED1,LED2复用

4. PIC32MZ EC Starter Kit的ethernet module有些port复用AN功能。

5. ethernet bootloader download完application后,跳转到application前 ,注意要清零所有使用到的register,包括disable interrupt。

  PhnLoader_v3.0和PhnBoot_v3.0之间采用UDP协议通信,通信数据包格式采用以下协定:

<STX><CMD><ADDRL><ADDRH><ADDRU><ADDRM><LEN><DATA>...<DATA><ETX>

STX - Start of packet indicator
ETX - End of packet indicator
LEN - The length of true data
DATA - General data 16 bytes, only first LEN of datas are true
CMD - Base command
ADDR - Address up to 32 bits  ( ADDRL , ADDRH , ADDRH, ADDRM)

  具体有以下Base command:

RD-VER:  0x00 -- Read Version Information (最终版本未实现)
RD_MEM: 0x01 -- Read Program Memory (最终版本未实现)
ER_MEM: 0x03 -- Erase Program Memory
WR_MEM: 0x02 -- Write Program Memory
WR_CFG: 0x04 -- Write Configuration Registers (最终版本未实现)

  PhnLoader_v3.0

  PhnLoader_v3.0 是PC端host 程序。

      运行环境:Window + .NET Framework 4.5

      开发语言:C#

      通信类型:UDP Server

      IP 地址: 192.168.1.105

      端口号:  8720

      UI 如下图:

  C#源代码主要部分:

            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;
                        //}
                        DownloadConfigLine(recordLine);
                        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\r\n");
                textBoxStatus.ForeColor = Color.Black;
                loaderServer.Close();
                loaderReader.Close();
                btnDownload.Enabled = true;
                return;
            }

  PhnBoot_v3.0

  PhnBoot_v3.0 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编译)

      通信类型:UDP Client

      IP 地址: 192.168.1.123

      端口号:  8740

  主要代码段:

        switch (GenUDPSt)
        {
        case SM_HOME:
            ARPResolve(&ServerNode.IPAddr);
            startTime = TickGet();
            GenUDPSt++;
            break;
        case SM_ARP:
            if (TickGet() - startTime < 5*TICK_SECOND)
            {
                if (ARPIsResolved(&ServerNode.IPAddr,&ServerNode.MACAddr))
                {
                    MySock = UDPOpen(LOCAL_CLIENT_PORT,&ServerNode,REMOTE_SERVER_PORT);
                    startTime = TickGet();
                    GenUDPSt++; 
                }
            }
            else
            {
                GenUDPSt = SM_HOME;
            }
            break;
        case SM_UDPOPEN:
            if (TickGet() - startTime < TICK_SECOND)
            {
                if (MySock != INVALID_UDP_SOCKET)
                {
                    startTime = TickGet();
                    GenUDPSt++;
                }
            }
            else
            {
                GenUDPSt = SM_HOME;
            }
            break;
        case SM_UDPPUT:
            if (TickGet() - startTime < 5*TICK_SECOND)
            {
                if (UDPIsPutReady(MySock) > BUFFER_MAX)
                {
                    UDPPutString(ok);
                    UDPFlush();
                    GenUDPSt++;
                }
            }
            else
            {
                GenUDPSt = SM_CLOSE;
            }
            break;
        case SM_UDPGET:
            if (TickGet() - startTime < 5*TICK_SECOND)
            {
                udpPackets = UDPIsGetReady(MySock);
                if (udpPackets >= BUFFER_MAX)
                {
                   UDPGetArray(frameBuffer, BUFFER_MAX);
                   UDPDiscard();
                   if (frameBuffer[0] == STX && frameBuffer[BUFFER_MAX - 1] == ETX)
                   {
                    Uart_Putc('.');
                    for(i=0;i<BUFFER_MAX;i++)
                    {
                        printf("%02x",frameBuffer[i]);
                    }
                    printf("%02x",frameBuffer[CMD_INDEX]);
                    printf("\r\n");
                    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:
                        GenUDPSt = SM_CLOSE;
                        break;
                     default:
                        break;
                    } 
                    startTime = TickGet();
                    if (GenUDPSt == SM_UDPGET) GenUDPSt = SM_RESPONCE;
                  }
                }
            }
            else
            {  
                GenUDPSt = SM_CLOSE;
            }
            break;
        case SM_RESPONCE:
            if (TickGet() - startTime < 10*TICK_SECOND)
            {
                if (UDPIsPutReady(MySock) >= BUFFER_MAX)
                {
                    UDPPutArray(frameBuffer, BUFFER_MAX);
                    UDPFlush();
                }
                startTime = TickGet();
                GenUDPSt = SM_UDPGET;
            }
            else
            {
                printf("xx");      // for debug
                GenUDPSt = SM_CLOSE;
            }
            break;
        case SM_CLOSE:
            printf("done\r\n");        // for debug
            UDPClose(MySock);
            MySock = INVALID_UDP_SOCKET;
            GenUDPSt = SM_HOME;
            TRISCSET = 0x2000; // RC13 Input
            LATCCLR = 0x6000;  // Clear LATC 
            LATHCLR = (1<<2);
            TRISHSET = (1<<2);
            INTDisableInterrupts();
            T1CON = 0;
            ETHCON1 = 0;
            ETHCON2 = 0;
            CoreT_DelayMs(1);
            U1MODE = 0x0;
            U1STA = 0x0;
            (*((void(*)(void))USER_APP_RESET_ADDRESS))();
            break;
        }

  如何使用PhnLoader_v3.0和PhnBoot_v3.0

      1. 使用XC32编译PhnBoot_v3.0(编译前,需先修改linker script)。

  2. 使用pickit3烧录PhnBoot_v3.0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_v3.0,选择UDP协议,端口号,IP地址。

  5. 点击PhnLoader_v3.0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_v3.0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。

posted @ 2016-04-09 21:42  GeekyGeek  阅读(1516)  评论(0编辑  收藏  举报