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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\r\n");
textBoxStatus.ForeColor = Color.Black;
loaderServer.Close();
loaderReader.Close();
btnDownload.Enabled = true;
return;
}
textBoxStatus.AppendText("Downloading completed\r\n");
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("\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:
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\r\n"); // 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。