I connect my device via USB (directly, no UART involved), and try to write firmware data to the flash.
FlashMagic says: LPC55S28 (USB, LPC5500) Operation failed. (programming - failed to send data to the device)
Debug file attached.
Any ideas on what could be wrong? As far as I know it's a brand new chip, so there shouldn't be any locked areas and such. Reading signature works, blank check works, erasing works. It's only firmware download that doesn't work.
Also FLashMagic crashes a lot when using the USB interface, maybe that indicates that something in particular is wrong?
kind regards,
Mikael
We worked around the problem by implementing the bootloader protocol in a simple command line app using hidapi, which also lets me run it on MacOS and Linux. Seems to be working well.