Help creating Bootloader for TWR-K21F120M to update from USB MSD

[kevinpenn]

I am trying to create a simple bootloader for the TWR-K21F120M that will allow me to update the device's software from a USB flash drive.  I've pursued a few leads, uTasker, various mcuoneclipse.com tutorials, all with no success.  Has anyone done anything similar with success?

[Jorge_Gonzalez]

Hello Kevin Penn:

The appnote AN4368 (MSD Host Bootloader) is the closest reference we have to your requirement. It was initially developed for a K60_100 MHz part, but colleague Adrian Sanchez migrated it to the K70_120 MHz device. The K70 has the same flash module type (FTFE) as your K21, so it should be easy to use that project. Please find it in the next document in community:

TWR-K70 MSD HOST Bootloader based on AN4368 source code

Regards!,
Jorge Gonzalez

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