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ATMEGA32U4 - USB Bootloader with encryption

 
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boeseturbo

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Joined: 23 Jul 2007
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PostPosted: Fri Jul 10, 2015 8:03 am    Post subject: ATMEGA32U4 - USB Bootloader with encryption Reply with quote

Hi,

did anybody know: is their a encrypted version of bootloader for hw-usb available? Maybe with MCS USB-ADDON libary?

Cheers

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albertsm

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Joined: 09 Apr 2004
Posts: 5056
Location: Holland

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PostPosted: Fri Jul 10, 2015 1:09 pm    Post subject: Reply with quote

The built in bootloader is from Atmel. i do not know if they share the source. but you could google or ask atmel support.

the usb add on could create a virtual com port so you could use mcs bootloader. when you use xtea it would be relatively simple.

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boeseturbo

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Joined: 23 Jul 2007
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PostPosted: Fri Jul 10, 2015 1:34 pm    Post subject: Reply with quote

that sounds pretty well Surprised) Will USB-ADDON and bootloader fits into 2048 words? I already use MCS loader with xtea but with FT230X UART to USB chip...

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albertsm

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PostPosted: Fri Jul 10, 2015 1:42 pm    Post subject: Reply with quote

hmm. that is a good question. when using usb you need to enable ints. and it means you need the interrupt table. i do not think it will fit.
you could strip down the code to remove features but i doubt it will fit.

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