Hi. I don’t think this question has been asked. Sorry if I missed it. I have created a shield pcb for the Electron. It contains a microSD card capability run off the SPI lines of the Electron and using standard FAT file storage. I would like to write a user firmware file (say user.bin) to the SD c…

Really good question and I would like to see you make this work out. Good luck!

Anyone out there? All is quiet. I extracted this from the documentation on the bootloader. Over The Air Mode (aka OTA Mode): This mode is very similar to the factory reset mode. Upon detecting that the OTA_UPDATE_MODE flag is true, the bootloader takes a back up of the current firmware to EXTERNA…

That might be something for @jvanier to answer :wink:

Thanks for the ping. This is an interesting idea! I don’t think anybody has explored this option. For the Electron you’ll need to look at INTERNAL_FLASH_OTA_ADDRESS since it doesn’t have external flash. I don’t know enough details about the OTA flash process to give better guidance in this area. A…

Thanks for that, I am sure I will be back with questions but it is a start.

@jvanier Just taking up your suggestion I have downloaded the YModem flash code and see that it establishes a YMODEM class which is largely irrelevant to what I want to do, although a guide. However the last call in the YMODEM cpp file is bool Ymodem_Serial_Flash_Update(Stream serialObj, FileTransf…

You’re on the right track. These classes don’t have extensive documentation since they are not meant for external users, so you’ll definitely have to do dine reverse engineering of the required format.

Please do share if and when you figure this out if your willing. Are you only using the SD card for loading new firmware or are you also using that extra memory on the SD card for other data that your application uses? Using an SD card like you for firmware updates + bitmap image storage sounds li…

@RWB My application will use the SD card for a number of things mainly data recording as the device is part of our data gathering system and I will keep a hard copy on site even though the main access is sending the data to an FTP server. I have managed to get the SdFat library operational for my …

@jvanier The YMODEM cpp file compiles for me without errors so that is a start. Can I assume that if I build it into a small application where I send the Electron a firmware file using Ymodem format that it should do a firmware change? Is this the basis for the serial flash function in the CLI or a …

Flashing user firmware on Electron from SD card

Firmware

rickkas7 October 1, 2016, 10:47pm 13

I was able to get this to work; it didn't even require ymodem!

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Flashing user firmware on Electron from SD card

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