SAM D21 Clock configuration.

#include <clock.h>

Macros
#define	CONF_CLOCK_APBA_DIVIDER SYSTEM_MAIN_CLOCK_DIV_1

#define	CONF_CLOCK_APBB_DIVIDER SYSTEM_MAIN_CLOCK_DIV_1

#define	CONF_CLOCK_APBC_DIVIDER SYSTEM_MAIN_CLOCK_DIV_1

#define	CONF_CLOCK_CONFIGURE_GCLK true

#define	CONF_CLOCK_CPU_CLOCK_FAILURE_DETECT false

#define	CONF_CLOCK_CPU_DIVIDER SYSTEM_MAIN_CLOCK_DIV_1

#define	CONF_CLOCK_DFLL_ENABLE false

#define	CONF_CLOCK_DFLL_ENABLE_CHILL_CYCLE true

#define	CONF_CLOCK_DFLL_FINE_VALUE (512)

#define	CONF_CLOCK_DFLL_KEEP_LOCK_ON_WAKEUP true

#define	CONF_CLOCK_DFLL_LOOP_MODE SYSTEM_CLOCK_DFLL_LOOP_MODE_OPEN

#define	CONF_CLOCK_DFLL_MAX_COARSE_STEP_SIZE (0x1f / 4)

#define	CONF_CLOCK_DFLL_MAX_FINE_STEP_SIZE (0xff / 4)

#define	CONF_CLOCK_DFLL_MULTIPLY_FACTOR 6

#define	CONF_CLOCK_DFLL_ON_DEMAND false

#define	CONF_CLOCK_DFLL_QUICK_LOCK true

#define	CONF_CLOCK_DFLL_SOURCE_GCLK_GENERATOR GCLK_GENERATOR_1

#define	CONF_CLOCK_DFLL_TRACK_AFTER_FINE_LOCK true

#define	CONF_CLOCK_DPLL_ENABLE false

#define	CONF_CLOCK_DPLL_FILTER SYSTEM_CLOCK_SOURCE_DPLL_FILTER_DEFAULT

#define	CONF_CLOCK_DPLL_LOCK_BYPASS false

#define	CONF_CLOCK_DPLL_LOCK_GCLK_GENERATOR GCLK_GENERATOR_1

#define	CONF_CLOCK_DPLL_LOCK_TIME SYSTEM_CLOCK_SOURCE_DPLL_LOCK_TIME_DEFAULT

#define	CONF_CLOCK_DPLL_LOW_POWER_ENABLE false

#define	CONF_CLOCK_DPLL_ON_DEMAND true

#define	CONF_CLOCK_DPLL_OUTPUT_FREQUENCY 48000000

#define	CONF_CLOCK_DPLL_REFERENCE_CLOCK SYSTEM_CLOCK_SOURCE_DPLL_REFERENCE_CLOCK_XOSC32K

#define	CONF_CLOCK_DPLL_REFERENCE_DIVIDER 1

#define	CONF_CLOCK_DPLL_REFERENCE_FREQUENCY 32768

#define	CONF_CLOCK_DPLL_REFERENCE_GCLK_GENERATOR GCLK_GENERATOR_1

#define	CONF_CLOCK_DPLL_RUN_IN_STANDBY false

#define	CONF_CLOCK_DPLL_WAKE_UP_FAST false

#define	CONF_CLOCK_FLASH_WAIT_STATES 0

#define	CONF_CLOCK_GCLK_0_CLOCK_SOURCE SYSTEM_CLOCK_SOURCE_OSC8M

#define	CONF_CLOCK_GCLK_0_ENABLE true

#define	CONF_CLOCK_GCLK_0_OUTPUT_ENABLE false

#define	CONF_CLOCK_GCLK_0_PRESCALER 1

#define	CONF_CLOCK_GCLK_0_RUN_IN_STANDBY false

#define	CONF_CLOCK_GCLK_1_CLOCK_SOURCE SYSTEM_CLOCK_SOURCE_OSC8M

#define	CONF_CLOCK_GCLK_1_ENABLE false

#define	CONF_CLOCK_GCLK_1_OUTPUT_ENABLE false

#define	CONF_CLOCK_GCLK_1_PRESCALER 1

#define	CONF_CLOCK_GCLK_1_RUN_IN_STANDBY false

#define	CONF_CLOCK_GCLK_2_CLOCK_SOURCE SYSTEM_CLOCK_SOURCE_OSC32K

#define	CONF_CLOCK_GCLK_2_ENABLE false

#define	CONF_CLOCK_GCLK_2_OUTPUT_ENABLE false

#define	CONF_CLOCK_GCLK_2_PRESCALER 32

#define	CONF_CLOCK_GCLK_2_RUN_IN_STANDBY false

#define	CONF_CLOCK_GCLK_3_CLOCK_SOURCE SYSTEM_CLOCK_SOURCE_OSC8M

#define	CONF_CLOCK_GCLK_3_ENABLE true

#define	CONF_CLOCK_GCLK_3_OUTPUT_ENABLE false

#define	CONF_CLOCK_GCLK_3_PRESCALER 16

#define	CONF_CLOCK_GCLK_3_RUN_IN_STANDBY false

#define	CONF_CLOCK_GCLK_4_CLOCK_SOURCE SYSTEM_CLOCK_SOURCE_OSC8M

#define	CONF_CLOCK_GCLK_4_ENABLE false

#define	CONF_CLOCK_GCLK_4_OUTPUT_ENABLE false

#define	CONF_CLOCK_GCLK_4_PRESCALER 1

#define	CONF_CLOCK_GCLK_4_RUN_IN_STANDBY false

#define	CONF_CLOCK_GCLK_5_CLOCK_SOURCE SYSTEM_CLOCK_SOURCE_OSC8M

#define	CONF_CLOCK_GCLK_5_ENABLE false

#define	CONF_CLOCK_GCLK_5_OUTPUT_ENABLE false

#define	CONF_CLOCK_GCLK_5_PRESCALER 1

#define	CONF_CLOCK_GCLK_5_RUN_IN_STANDBY false

#define	CONF_CLOCK_GCLK_6_CLOCK_SOURCE SYSTEM_CLOCK_SOURCE_OSC8M

#define	CONF_CLOCK_GCLK_6_ENABLE false

#define	CONF_CLOCK_GCLK_6_OUTPUT_ENABLE false

#define	CONF_CLOCK_GCLK_6_PRESCALER 1

#define	CONF_CLOCK_GCLK_6_RUN_IN_STANDBY false

#define	CONF_CLOCK_GCLK_7_CLOCK_SOURCE SYSTEM_CLOCK_SOURCE_OSC8M

#define	CONF_CLOCK_GCLK_7_ENABLE false

#define	CONF_CLOCK_GCLK_7_OUTPUT_ENABLE false

#define	CONF_CLOCK_GCLK_7_PRESCALER 1

#define	CONF_CLOCK_GCLK_7_RUN_IN_STANDBY false

#define	CONF_CLOCK_GCLK_8_CLOCK_SOURCE SYSTEM_CLOCK_SOURCE_OSC8M

#define	CONF_CLOCK_GCLK_8_ENABLE false

#define	CONF_CLOCK_GCLK_8_OUTPUT_ENABLE false

#define	CONF_CLOCK_GCLK_8_PRESCALER 1

#define	CONF_CLOCK_GCLK_8_RUN_IN_STANDBY false

#define	CONF_CLOCK_OSC32K_ENABLE false

#define	CONF_CLOCK_OSC32K_ENABLE_1KHZ_OUTPUT true

#define	CONF_CLOCK_OSC32K_ENABLE_32KHZ_OUTPUT true

#define	CONF_CLOCK_OSC32K_ON_DEMAND true

#define	CONF_CLOCK_OSC32K_RUN_IN_STANDBY false

#define	CONF_CLOCK_OSC32K_STARTUP_TIME SYSTEM_OSC32K_STARTUP_130

#define	CONF_CLOCK_OSC8M_ON_DEMAND true

#define	CONF_CLOCK_OSC8M_PRESCALER SYSTEM_OSC8M_DIV_1

#define	CONF_CLOCK_OSC8M_RUN_IN_STANDBY false

#define	CONF_CLOCK_XOSC32K_AUTO_AMPLITUDE_CONTROL false

#define	CONF_CLOCK_XOSC32K_ENABLE false

#define	CONF_CLOCK_XOSC32K_ENABLE_1KHZ_OUPUT false

#define	CONF_CLOCK_XOSC32K_ENABLE_32KHZ_OUTPUT true

#define	CONF_CLOCK_XOSC32K_EXTERNAL_CRYSTAL SYSTEM_CLOCK_EXTERNAL_CRYSTAL

#define	CONF_CLOCK_XOSC32K_ON_DEMAND true

#define	CONF_CLOCK_XOSC32K_RUN_IN_STANDBY false

#define	CONF_CLOCK_XOSC32K_STARTUP_TIME SYSTEM_XOSC32K_STARTUP_65536

#define	CONF_CLOCK_XOSC_AUTO_GAIN_CONTROL true

#define	CONF_CLOCK_XOSC_ENABLE false

#define	CONF_CLOCK_XOSC_EXTERNAL_CRYSTAL SYSTEM_CLOCK_EXTERNAL_CRYSTAL

#define	CONF_CLOCK_XOSC_EXTERNAL_FREQUENCY 12000000UL

#define	CONF_CLOCK_XOSC_ON_DEMAND true

#define	CONF_CLOCK_XOSC_RUN_IN_STANDBY false

#define	CONF_CLOCK_XOSC_STARTUP_TIME SYSTEM_XOSC_STARTUP_32768