I actually have the old AN68272 Bootloader Host GUI project kicking around. I've attached it.
I will note though that I ran into a number of problems, especially with the interop services to allow the C unmanaged bootl_utils.dll to work with a C# .NET application. At the very least though it can maybe provide a starting point like it did for me to build you own application.
I can also share the library I built to port the bootloader host dll (originally written in C) into C# .NET so that I could use it as a managed library with my host application rather than having to use interop where I was running into so many issues. I can't promise it's perfect, I'm sure there's still bugs present I haven't come across, but it may make getting a bootloader host application going quicker. The linked thread has download links for the project I used during development, which includes a WPF testing application that uses the UART.
You say you already have a USB bootloader going, so changing around to a different communcation interface such as UART shouldn't be much trouble at all if you're using the bootl_utils.dll. Just a matter of writing the requisite OpenConnection()/CloseConnection()/ReadData()/WriteData() functions to use your desired communication interface.
In the C# version of the bootl_utils library, I wrote it so the communication functions are written as an interface that you pass to the CyBtldr_Program() API function:
public class UART_ConnectionData : ICommunicationData
{
public HostReturnCodes OpenConnection()
{
HostReturnCodes status = HostReturnCodes.CYRET_SUCCESS;
//Open the COM Port
return status;
}
public HostReturnCodes CloseConnection()
{
HostReturnCodes status = HostReturnCodes.CYRET_SUCCESS;
//Close the COM Port
return HostReturnCodes.CYRET_SUCCESS;
}
public HostReturnCodes ReadData(byte[] dataBuf, uint numBytes)
{
HostReturnCodes status = HostReturnCodes.CYRET_SUCCESS;
//Read numBytes amount of data from COM Port into dataBuf
return status;
}
public HostReturnCodes WriteData(byte[] dataBuf, uint numBytes)
{
HostReturnCodes status = HostReturnCodes.CYRET_SUCCESS;
//Write numBytes amount of data to COM Port from dataBuf
return status;
}
public int MaxTransferSize
{
get { return 64; } //Default 64 Bytes per packet
}
}
Create an instance of the interface object:
UART_ConnectionData UART_CommData = new UART_ConnectionData();
And then just pass it to the CyBtldr_Program() API function:
BootloaderAPI.CyBtldr_Program(Chosen_File_Cyacd, securityKey, appID, UART_CommData, update);
