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circuitpython/ports/atmel-samd/peripherals
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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
..
samd21 Use the external crystal on SAMD21 again. 2018-06-01 18:01:42 -07:00
samd51 Use the external crystal on SAMD21 again. 2018-06-01 18:01:42 -07:00
adc.h atmel-samd: Re-org helper peripheral files into their own subdirectory. 2018-06-01 15:07:31 -07:00
cache.h atmel-samd: Re-org helper peripheral files into their own subdirectory. 2018-06-01 15:07:31 -07:00
clocks.c atmel-samd: Add rotary encoder support. 2018-06-01 15:08:48 -07:00
clocks.h Use the external crystal on SAMD21 again. 2018-06-01 18:01:42 -07:00
dma.c atmel-samd: Re-org helper peripheral files into their own subdirectory. 2018-06-01 15:07:31 -07:00
dma.h atmel-samd: Re-org helper peripheral files into their own subdirectory. 2018-06-01 15:07:31 -07:00
events.c atmel-samd: Add rotary encoder support. 2018-06-01 15:08:48 -07:00
events.h atmel-samd: Re-org helper peripheral files into their own subdirectory. 2018-06-01 15:07:31 -07:00
external_interrupts.c atmel-samd: Add rotary encoder support. 2018-06-01 15:08:48 -07:00
external_interrupts.h atmel-samd: Add rotary encoder support. 2018-06-01 15:08:48 -07:00
i2s.c atmel-samd: Re-org helper peripheral files into their own subdirectory. 2018-06-01 15:07:31 -07:00
i2s.h atmel-samd: Re-org helper peripheral files into their own subdirectory. 2018-06-01 15:07:31 -07:00
pins.h atmel-samd: Re-org helper peripheral files into their own subdirectory. 2018-06-01 15:07:31 -07:00
sercom.c atmel-samd: Re-org helper peripheral files into their own subdirectory. 2018-06-01 15:07:31 -07:00
sercom.h atmel-samd: Re-org helper peripheral files into their own subdirectory. 2018-06-01 15:07:31 -07:00
timers.c atmel-samd: Re-org helper peripheral files into their own subdirectory. 2018-06-01 15:07:31 -07:00
timers.h atmel-samd: Re-org helper peripheral files into their own subdirectory. 2018-06-01 15:07:31 -07:00