DEMO 2376A (featuring LTC 2664-16) with Linduino 2026C: "failed to download file from... /D2668.txt" when running Update LTC2668 and Similar

Hi Everyone,

Thanks for the responses for this thread, we really appreciate it.

Hi DanielF ,

Again, we would like to apologize for the inconvenience the issue has caused you. We dived into this issue further and you may try these solutions:

Looking through the code, this is a pretty fundamental error, and the most likely cause really is a bad ID string. (The error is reported by the app, but is actually found in the low-level API that isn’t looking for any particular ID string, just that it is correctly formatted.)

There are two reasons for a bad ID string:
1. EEPROM corruption
2. The customer has a part-specific sketch loaded on the Linduino, instead of the DC590 emulator sketch, which is needed for use in QuikEval GUIs.

The easiest way to get the ID string is to use a serial terminal. If the customer has the Arduino IDE, they can use the serial monitor, or they can use Termite or PuTTY or something else. They just need to set the COM port, and make sure the Baud rate is 115200. After that they need to send the string IZ (uppercase i and uppercase z) and send us the string they get back in response. The expected string is:
LTC2664-16,Cls,D2668,01,01,DC,DC2376A-A,--------

One way that doesn’t require any downloads but is a bit trickier is to use PowerShell, which comes with Windows. Here is a recipe (for each step that starts with “Enter” they should copy or type the text, and then press the enter key)
1. In the start menu search for PowerShell and click “Windows PowerShell”
2. Enter the following command and note the port number or numbers:
[System.IO.Ports.SerialPort]::getportnames()
You should see something like COM3 get returned, if you get multiple, you may have to try some or all of them, but usually the last one in the list is the right one, since the Linduino is often the last USB device plugged in.
3. Enter the following, but replace COM3 with the correct port number you got from the step above:
$port= new-Object System.IO.Ports.SerialPort COM3,115200,None,8,one
4. Now Enter each of the following, as written
$port.open()
$port.ReadLine()
$port.WriteLine("IZ")
$port.ReadLine()
$port.close()
5. Hopefully when you enter the second $port.ReadLine() you will get a string that starts with LTC and ends with a bunch of dashes, that is the ID string we need.
There is a possibility that you may need to skip the first $port.ReadLine(). The “IZ” string is an uppercase i and uppercase z.

Best Regards,

Den

Hi Everyone,

Thanks for the responses for this thread, we really appreciate it.

Hi DanielF ,

Again, we would like to apologize for the inconvenience the issue has caused you. We dived into this issue further and you may try these solutions:

Looking through the code, this is a pretty fundamental error, and the most likely cause really is a bad ID string. (The error is reported by the app, but is actually found in the low-level API that isn’t looking for any particular ID string, just that it is correctly formatted.)

There are two reasons for a bad ID string:
1. EEPROM corruption
2. The customer has a part-specific sketch loaded on the Linduino, instead of the DC590 emulator sketch, which is needed for use in QuikEval GUIs.

The easiest way to get the ID string is to use a serial terminal. If the customer has the Arduino IDE, they can use the serial monitor, or they can use Termite or PuTTY or something else. They just need to set the COM port, and make sure the Baud rate is 115200. After that they need to send the string IZ (uppercase i and uppercase z) and send us the string they get back in response. The expected string is:
LTC2664-16,Cls,D2668,01,01,DC,DC2376A-A,--------

One way that doesn’t require any downloads but is a bit trickier is to use PowerShell, which comes with Windows. Here is a recipe (for each step that starts with “Enter” they should copy or type the text, and then press the enter key)
1. In the start menu search for PowerShell and click “Windows PowerShell”
2. Enter the following command and note the port number or numbers:
[System.IO.Ports.SerialPort]::getportnames()
You should see something like COM3 get returned, if you get multiple, you may have to try some or all of them, but usually the last one in the list is the right one, since the Linduino is often the last USB device plugged in.
3. Enter the following, but replace COM3 with the correct port number you got from the step above:
$port= new-Object System.IO.Ports.SerialPort COM3,115200,None,8,one
4. Now Enter each of the following, as written
$port.open()
$port.ReadLine()
$port.WriteLine("IZ")
$port.ReadLine()
$port.close()
5. Hopefully when you enter the second $port.ReadLine() you will get a string that starts with LTC and ends with a bunch of dashes, that is the ID string we need.
There is a possibility that you may need to skip the first $port.ReadLine(). The “IZ” string is an uppercase i and uppercase z.

Best Regards,

Den

Another option if DanielF really wants to use the QuikEval GUI and if the EEPROM is in fact corrupt - the DC590_enhanced sketch SHOULD default to acting like the DC590 emulator, and it has an "EEPROM spoof" construct here:

https://github.com/analogdevicesinc/Linduino/blob/master/LTSketchbook/Utilities/DC590B_enhanced/DC590B_enhanced.ino#L63

Replace the string with that noted above, double-checking that the string length is exactly the same as the other examples (padded out with dashes.)

This sketch was in response to various customer questions and requests, one of which was to enable QuikEval to talk to devices soldered down to a customer's board, without needing an EEPROM. The feature is provided "as is" but should work fine with the eval board.

Again this is only necessary if it's determined that the EEPROM is corrupt.

-Mark