新PIC18 Bootloader

　　PhsBoot_v3.0是我最新用C語言實現(xiàn)的PIC bootloader, 采用串口通信，適用于PIC18, 并為其用C#寫了PC端通信程序PhsLoader_v3.0。PhsLoader_v3.0通過串口按照自定義的通信協(xié)定發(fā)送數(shù)據(jù)PhsBoot_v3.0, PhsBoot_v3.0接收數(shù)據(jù)，按照通信協(xié)定解讀數(shù)據(jù)，解讀出其中Hex數(shù)據(jù)，并將其燒錄到正確的位置。

　　通信協(xié)定

　　PIC18單片機(jī)端PhsBoot_v3.0和PC端PhsLoader_v3.0之間的通信數(shù)據(jù)包采用以下協(xié)定

...

　　定義如下:

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 24 bits ( ADDRL , ADDRH , ADDRH)

　　具體有以下Base command:

RD-VER: 0x00 -- Read Version Information (最終版本刪除了此命令)

RD_MEM： 0x01 -- Read Program Memory (最終版本刪除了此命令)

ER_MEM: 0x03 -- Erase Program Memory

WR_MEM： 0x02 -- Write Program Memory

WR_CFG： 0x04 -- Write Configuration Registers

　　PhsLoader_v3.0 功能

　　定義好了通訊協(xié)定, 接著就按照協(xié)定去實現(xiàn)PhsLoader_v3.0。 PhsLoader_v3.0的具體功能包括選擇COM端口和BAUD RATE, 連接COM, 加載應(yīng)用程序Hex文件，Parse 應(yīng)用程序的Hex文件，一行一行解讀Hex文件，然后按照通訊協(xié)定通過串口發(fā)送Hex記錄到單片機(jī)，接收單片機(jī)發(fā)送回來的Response，發(fā)送完畢后斷開COM連接，發(fā)送期間出現(xiàn)問題就立馬結(jié)束發(fā)送。

　　PhsLoader_v3.0 主要代碼段

　　PhsLoader_v3.0是用C#實現(xiàn)的，是我在利用空余時間自學(xué)C#后寫的，上面提到的功能都實現(xiàn)了。

private void btnDownload_Click(object sender, EventArgs e)

{

btnDownload.Enabled = false;

pBarLoading.Visible = false;

if (!this.connect())

{

btnDownload.Enabled = true;

return;

}

try

{

loaderReader = new StreamReader(textBoxFile.Text);

}

catch (Exception ex)

{

Debug.WriteLine("Error: " + ex.Message);

textBoxStatus.ForeColor = Color.Red;

textBoxStatus.AppendText("Read hex file unsuccessfullyrn");

textBoxStatus.ForeColor = Color.Black;

loaderReader.Close();

loaderSerial.Close();

btnDownload.Enabled = true;

return;

}

loaderFrame = new SerialFrame();

if (!erase())

{

textBoxStatus.ForeColor = Color.Red;

textBoxStatus.AppendText("Erase unsuccessfullyrn");

textBoxStatus.ForeColor = Color.Black;

loaderReader.Close();

loaderSerial.Close();

btnDownload.Enabled = true;

return;

}

pBarLoading.Refresh();

pBarLoading.Visible = true;

pBarLoading.Value = 0;

pBarLoading.Maximum = loaderLines;

pBarLoading.Step = 1;

string recordLine;

Address_U = 0;

bool isNextLineUserID = false;

bool isNextLineConfigBits = false;

textBoxStatus.AppendText("rnDownloading hex file ...rn");

try

{

while (loaderReader.Peek() >= 0)

{

pBarLoading.PerformStep();

recordLine = loaderReader.ReadLine();

//if (recordLine.Contains(USER_ID_TOKEN) == true)

//{

// isNextLineUserID = true;

// continue;

//}

//else if (recordLine.Contains(CONFIG_BITS_TOKEN) == true)

//{

// isNextLineConfigBits = true;

// continue;

//}

if (recordLine.Contains(EXTEND_TOKEN) == true)

{

if (recordLine.Contains(USER_ID_TOKEN) == true)

{

isNextLineUserID = true;

continue;

}

else if (recordLine.Contains(CONFIG_BITS_TOKEN) == true)

{

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);

Address_U = 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");