Scott Shawcroft e580d22f4a Use the external crystal on SAMD21 again. ... Also, re-enable calibration storage for CircuitPlayground Express. Tested with a 500hz PWMOut on Metro M0 with Saleae: * with crystal 500hz * with usb 500hz +- 0.1hz * without either 487hz += 0.1hz SAMD51 is skipped due to DFLL errata and the fact it defaults to a factory calibrated 48mhz that works fine for USB. Fixes #648		2018-06-01 18:01:42 -07:00
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filesystem.c	Use the external crystal on SAMD21 again.	2018-06-01 18:01:42 -07:00
port.c	Use the external crystal on SAMD21 again.	2018-06-01 18:01:42 -07:00
serial.c	WIP: works with just keyboard but not complex report descriptor	2018-03-30 23:24:00 -04:00