Commitdad33e6

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atmel-samd: Reset the DAC on soft reset.Fixesadafruit#80.

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Original file line number	Diff line number	Diff line change
`@@ -161,6 +161,10 @@ void reset_samd21(void) {`
`161`	`161`
`162`	`162`	`analogin_reset();`
`163`	`163`
	`164`	`+// Wait for the DAC to sync.`
	`165`	`+while (DAC->STATUS.reg&DAC_STATUS_SYNCBUSY) {}`
	`166`	`+DAC->CTRLA.reg \|=DAC_CTRLA_SWRST;`
	`167`	`+`
`164`	`168`	`structsystem_pinmux_configconfig;`
`165`	`169`	`system_pinmux_get_config_defaults(&config);`
`166`	`170`	`config.powersave= true;`

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