clock_feature.h File Reference

SAM L21 Clock Driver.

Copyright (c) 2014-2018 Microchip Technology Inc. and its subsidiaries.

#include <compiler.h>
#include <gclk.h>

Data Structures
struct	system_clock_source_dfll_config
	Configuration structure for DFLL. More...
struct	system_clock_source_dpll_config
	Configuration structure for DPLL. More...
struct	system_clock_source_osc16m_config
	Configuration structure for OSC16M. More...
struct	system_clock_source_osc32k_config
	Configuration structure for OSCULP32K. More...
struct	system_clock_source_osculp32k_config
	Configuration structure for OSCULP32K. More...
struct	system_clock_source_xosc32k_config
	Configuration structure for XOSC32K. More...
struct	system_clock_source_xosc_config
	Configuration structure for XOSC. More...

Enumerations
enum	system_clock_apb_bus {   SYSTEM_CLOCK_APB_APBA,   SYSTEM_CLOCK_APB_APBB,   SYSTEM_CLOCK_APB_APBC,   SYSTEM_CLOCK_APB_APBD,   SYSTEM_CLOCK_APB_APBE }
	List of APB peripheral buses. More...
enum	system_clock_dfll_chill_cycle {   SYSTEM_CLOCK_DFLL_CHILL_CYCLE_ENABLE,   SYSTEM_CLOCK_DFLL_CHILL_CYCLE_DISABLE = OSCCTRL_DFLLCTRL_CCDIS }
	Chill cycle behavior of the DFLL module. More...
enum	system_clock_dfll_loop_mode {   SYSTEM_CLOCK_DFLL_LOOP_MODE_OPEN,   SYSTEM_CLOCK_DFLL_LOOP_MODE_CLOSED = OSCCTRL_DFLLCTRL_MODE }
	Operating modes of the DFLL clock source. More...
enum	system_clock_dfll_quick_lock {   SYSTEM_CLOCK_DFLL_QUICK_LOCK_ENABLE,   SYSTEM_CLOCK_DFLL_QUICK_LOCK_DISABLE = OSCCTRL_DFLLCTRL_QLDIS }
	QuickLock settings for the DFLL module. More...
enum	system_clock_dfll_stable_tracking {   SYSTEM_CLOCK_DFLL_STABLE_TRACKING_TRACK_AFTER_LOCK,   SYSTEM_CLOCK_DFLL_STABLE_TRACKING_FIX_AFTER_LOCK = OSCCTRL_DFLLCTRL_STABLE }
	Fine tracking behavior for the DFLL once a lock has been acquired. More...
enum	system_clock_dfll_wakeup_lock {   SYSTEM_CLOCK_DFLL_WAKEUP_LOCK_KEEP,   SYSTEM_CLOCK_DFLL_WAKEUP_LOCK_LOSE = OSCCTRL_DFLLCTRL_LLAW }
	Locking behavior for the DFLL during device wake-up. More...
enum	system_clock_external {   SYSTEM_CLOCK_EXTERNAL_CRYSTAL,   SYSTEM_CLOCK_EXTERNAL_CLOCK }
	External clock source types. More...
enum	system_clock_source {   SYSTEM_CLOCK_SOURCE_OSC16M = GCLK_SOURCE_OSC16M,   SYSTEM_CLOCK_SOURCE_OSC32K = GCLK_SOURCE_OSC32K,   SYSTEM_CLOCK_SOURCE_XOSC = GCLK_SOURCE_XOSC,   SYSTEM_CLOCK_SOURCE_XOSC32K = GCLK_SOURCE_XOSC32K,   SYSTEM_CLOCK_SOURCE_DFLL = GCLK_SOURCE_DFLL48M,   SYSTEM_CLOCK_SOURCE_ULP32K = GCLK_SOURCE_OSCULP32K,   SYSTEM_CLOCK_SOURCE_GCLKIN = GCLK_SOURCE_GCLKIN,   SYSTEM_CLOCK_SOURCE_GCLKGEN1 = GCLK_SOURCE_GCLKGEN1,   SYSTEM_CLOCK_SOURCE_DPLL = GCLK_SOURCE_FDPLL }
	Available clock sources in the system. More...
enum	system_clock_source_dpll_filter {   SYSTEM_CLOCK_SOURCE_DPLL_FILTER_DEFAULT,   SYSTEM_CLOCK_SOURCE_DPLL_FILTER_LOW_BANDWIDTH_FILTER,   SYSTEM_CLOCK_SOURCE_DPLL_FILTER_HIGH_BANDWIDTH_FILTER,   SYSTEM_CLOCK_SOURCE_DPLL_FILTER_HIGH_DAMPING_FILTER }
	Filter type of the DPLL module. More...
enum	system_clock_source_dpll_lock_time {   SYSTEM_CLOCK_SOURCE_DPLL_LOCK_TIME_DEFAULT,   SYSTEM_CLOCK_SOURCE_DPLL_LOCK_TIME_8MS = 0x04,   SYSTEM_CLOCK_SOURCE_DPLL_LOCK_TIME_9MS,   SYSTEM_CLOCK_SOURCE_DPLL_LOCK_TIME_10MS,   SYSTEM_CLOCK_SOURCE_DPLL_LOCK_TIME_11MS }
	Lock time-out value of the DPLL module. More...
enum	system_clock_source_dpll_prescaler {   SYSTEM_CLOCK_SOURCE_DPLL_DIV_1,   SYSTEM_CLOCK_SOURCE_DPLL_DIV_2,   SYSTEM_CLOCK_SOURCE_DPLL_DIV_4 }
	DPLL Output Clock Prescaler. More...
enum	system_clock_source_dpll_reference_clock {   SYSTEM_CLOCK_SOURCE_DPLL_REFERENCE_CLOCK_XOSC32K,   SYSTEM_CLOCK_SOURCE_DPLL_REFERENCE_CLOCK_XOSC,   SYSTEM_CLOCK_SOURCE_DPLL_REFERENCE_CLOCK_GCLK }
	Reference clock source of the DPLL module. More...
enum	system_main_clock_div {   SYSTEM_MAIN_CLOCK_DIV_1,   SYSTEM_MAIN_CLOCK_DIV_2,   SYSTEM_MAIN_CLOCK_DIV_4,   SYSTEM_MAIN_CLOCK_DIV_8,   SYSTEM_MAIN_CLOCK_DIV_16,   SYSTEM_MAIN_CLOCK_DIV_32,   SYSTEM_MAIN_CLOCK_DIV_64,   SYSTEM_MAIN_CLOCK_DIV_128 }
	Main CPU, Lowpower and Backup clock division. More...
enum	system_osc16m_fsel {   SYSTEM_OSC16M_4M,   SYSTEM_OSC16M_8M,   SYSTEM_OSC16M_12M,   SYSTEM_OSC16M_16M }
	Frequency selection for the internal 16MHz system clock. More...
enum	system_osc32k_startup {   SYSTEM_OSC32K_STARTUP_3,   SYSTEM_OSC32K_STARTUP_4,   SYSTEM_OSC32K_STARTUP_6,   SYSTEM_OSC32K_STARTUP_10,   SYSTEM_OSC32K_STARTUP_18,   SYSTEM_OSC32K_STARTUP_34,   SYSTEM_OSC32K_STARTUP_66,   SYSTEM_OSC32K_STARTUP_130 }
	Available start-up times for the OSC32K. More...
enum	system_xosc32k_startup {   SYSTEM_XOSC32K_STARTUP_2048,   SYSTEM_XOSC32K_STARTUP_4096,   SYSTEM_XOSC32K_STARTUP_16384,   SYSTEM_XOSC32K_STARTUP_32768,   SYSTEM_XOSC32K_STARTUP_65536,   SYSTEM_XOSC32K_STARTUP_131072,   SYSTEM_XOSC32K_STARTUP_262144 }
	Available start-up times for the XOSC32K. More...
enum	system_xosc_startup {   SYSTEM_XOSC_STARTUP_1,   SYSTEM_XOSC_STARTUP_2,   SYSTEM_XOSC_STARTUP_4,   SYSTEM_XOSC_STARTUP_8,   SYSTEM_XOSC_STARTUP_16,   SYSTEM_XOSC_STARTUP_32,   SYSTEM_XOSC_STARTUP_64,   SYSTEM_XOSC_STARTUP_128,   SYSTEM_XOSC_STARTUP_256,   SYSTEM_XOSC_STARTUP_512,   SYSTEM_XOSC_STARTUP_1024,   SYSTEM_XOSC_STARTUP_2048,   SYSTEM_XOSC_STARTUP_4096,   SYSTEM_XOSC_STARTUP_8192,   SYSTEM_XOSC_STARTUP_16384,   SYSTEM_XOSC_STARTUP_32768 }
	Available start-up times for the XOSC. More...

Functions
External Oscillator Management
static void	system_clock_source_xosc_get_config_defaults (struct system_clock_source_xosc_config *const config)
	Retrieve the default configuration for XOSC. More...
void	system_clock_source_xosc_set_config (struct system_clock_source_xosc_config *const config)
	Configure the external oscillator clock source. More...
External 32KHz Oscillator Management
static void	system_clock_source_xosc32k_get_config_defaults (struct system_clock_source_xosc32k_config *const config)
	Retrieve the default configuration for XOSC32K. More...
void	system_clock_source_xosc32k_set_config (struct system_clock_source_xosc32k_config *const config)
	Configure the XOSC32K external 32KHz oscillator clock source. More...
Internal 32KHz Oscillator Management
static void	system_clock_source_osc32k_get_config_defaults (struct system_clock_source_osc32k_config *const config)
	Retrieve the default configuration for OSC32K. More...
void	system_clock_source_osc32k_set_config (struct system_clock_source_osc32k_config *const config)
	Configure the internal OSC32K oscillator clock source. More...
Internal Ultra Low Power 32KHz Oscillator Management
static void	system_clock_source_osculp32k_get_config_defaults (struct system_clock_source_osculp32k_config *const config)
	Retrieve the default configuration for OSCULP32K. More...
void	system_clock_source_osculp32k_set_config (struct system_clock_source_osculp32k_config *const config)
	Configure the internal OSCULP32K oscillator clock source. More...
Internal 16MHz Oscillator Management
static void	system_clock_source_osc16m_get_config_defaults (struct system_clock_source_osc16m_config *const config)
	Retrieve the default configuration for OSC16M. More...
void	system_clock_source_osc16m_set_config (struct system_clock_source_osc16m_config *const config)
	Configure the internal OSC16M oscillator clock source. More...
Internal DFLL Management
static void	system_clock_source_dfll_get_config_defaults (struct system_clock_source_dfll_config *const config)
	Retrieve the default configuration for DFLL. More...
void	system_clock_source_dfll_set_config (struct system_clock_source_dfll_config *const config)
	Configure the DFLL clock source. More...
Clock Source Management
enum status_code	system_clock_source_write_calibration (const enum system_clock_source system_clock_source, const uint16_t calibration_value, const uint8_t freq_range)
enum status_code	system_clock_source_enable (const enum system_clock_source system_clock_source)
enum status_code	system_clock_source_disable (const enum system_clock_source clk_source)
	Disables a clock source. More...
bool	system_clock_source_is_ready (const enum system_clock_source clk_source)
	Checks if a clock source is ready. More...
uint32_t	system_clock_source_get_hz (const enum system_clock_source clk_source)
	Retrieve the frequency of a clock source. More...
Main Clock Management
static void	system_main_clock_set_failure_detect (const bool enable)
	Enable or disable the main clock failure detection. More...
static void	system_cpu_clock_set_divider (const enum system_main_clock_div divider)
	Set main CPU clock divider. More...
static void	system_low_power_clock_set_divider (const enum system_main_clock_div divider)
	Set Low-Power Clock divider. More...
static void	system_backup_clock_set_divider (const enum system_main_clock_div divider)
	Set Backup Clock divider. More...
static uint32_t	system_cpu_clock_get_hz (void)
	Retrieves the current frequency of the CPU core. More...
static uint32_t	system_low_power_clock_get_hz (void)
	Retrieves the current frequency of Low-Power clock. More...
static uint32_t	system_backup_clock_get_hz (void)
	Retrieves the current frequency of backup clock. More...
Bus Clock Masking
static void	system_ahb_clock_set_mask (const uint32_t ahb_mask)
	Set bits in the clock mask for the AHB bus. More...
static void	system_ahb_clock_clear_mask (const uint32_t ahb_mask)
	Clear bits in the clock mask for the AHB bus. More...
static enum status_code	system_apb_clock_set_mask (const enum system_clock_apb_bus bus, const uint32_t mask)
	Set bits in the clock mask for an APBx bus. More...
static enum status_code	system_apb_clock_clear_mask (const enum system_clock_apb_bus bus, const uint32_t mask)
	Clear bits in the clock mask for an APBx bus. More...
Internal DPLL Management
static void	system_clock_source_dpll_get_config_defaults (struct system_clock_source_dpll_config *const config)
	Retrieve the default configuration for DPLL. More...
void	system_clock_source_dpll_set_config (struct system_clock_source_dpll_config *const config)
	Configure the DPLL clock source. More...
System Clock Initialization
void	system_clock_init (void)
	Initialize clock system based on the configuration in conf_clocks.h. More...
System Flash Wait States
static void	system_flash_set_waitstates (uint8_t wait_states)
	Set flash controller wait states. More...