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openocd support for Atmel SAMC 5.0V family

Atmel have released a 5.0V MCU family called SAMC which is equivalent to the normal SAMD family (there are SAMC20 and SAMC21 sets of parts). The Flash controller and other pertinent components are nearly identical so I submitted this patch for openocd which should add SAMC support to the existing SAMD driver.

This also adds config files for the SAMC Xplained Pro kits, atmel_samc20_xplained_pro.cfg and atmel_samc21_xplained_pro.cfg. These can be used directly or adapted as needed for your application. Speaking of which, what is the application for a 5.0V I/O family these days? Is it something legacy-compatible or perhaps industrial? I would love to know what folks are using these for outside of the hobby market.

Please give this patch a try if SAMC is interesting to you (I do not have the hardware to test with) and let me know if things work. This openocd Flash driver should support all of the M0+ parts including SAMD, SAMR, SAML, and SAMC now.

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