sysclk_auto.h File Reference

Application-specific system clock management to support automatic detection of external oscillator.

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

Functions
External routines required by main.c file and usbc driver
void	sysclk_auto_init (void)
	Detects extern OSC frequency and initialize system clocks on it. More...
void	sysclk_auto_enable_usb (void)
	Enable the USB generic clock. More...
void	sysclk_auto_disable_usb (void)
	Disable the USB generic clock. More...

void sysclk_auto_disable_usb

(

void

)

Disable the USB generic clock.

References AVR32_SCIF_GC_NO_DIV_CLOCK, AVR32_SCIF_GCLK_USBC, scif_gc_setup(), and SCIF_GCCTRL_PLL0.

void sysclk_auto_enable_usb

(

void

)

Enable the USB generic clock.

Precondition

The USB generic clock must be configured to 48MHz.

References AVR32_SCIF_GC_NO_DIV_CLOCK, AVR32_SCIF_GCLK_USBC, scif_gc_enable(), scif_gc_setup(), and SCIF_GCCTRL_PLL0.

void sysclk_auto_init

(

void

)

Detects extern OSC frequency and initialize system clocks on it.

References ast_enable(), ast_init_counter(), AST_OSC_RC, AVR32_ENTER_CRITICAL_REGION, AVR32_LEAVE_CRITICAL_REGION, scif_pll_opt_t::div, flashc_set_flash_waitstate_and_readmode(), flashc_set_wait_state(), freq_detect_start(), scif_pll_opt_t::lockcount, scif_pll_opt_t::mul, scif_pll_opt_t::osc, u_avr32_scif_oscctrl_t::OSCCTRL, scif_pll_opt_t::pll_div2, scif_pll_opt_t::pll_freq, scif_pll_opt_t::pll_wbwdisable, PM_CLK_DOMAIN_0, PM_CLK_DOMAIN_1, PM_CLK_DOMAIN_2, PM_CLK_DOMAIN_3, PM_CLK_DOMAIN_4, PM_CLK_SRC_OSC0, PM_CLK_SRC_PLL0, pm_disable_clk_domain_div(), pm_set_mclk_source(), scif_enable_osc(), SCIF_OSC0, SCIF_OSC_MODE_2PIN_CRYSTAL, SCIF_PLL0, scif_pll_enable(), scif_pll_setup(), SCIF_UNLOCK, and scif_wait_for_pll_locked().

Referenced by main().