Phase Locked Loop control APIs. More...

Macros
#define	PLL_RESET_NUM(pll)
	Returns the reset_num_t used to reset a given PLL instance. More...

Functions
void	pll_init (PLL pll, uint ref_div, uint vco_freq, uint post_div1, uint post_div2)
	Initialise specified PLL. More...

void	pll_deinit (PLL pll)
	Release/uninitialise specified PLL. More...

Detailed Description

Phase Locked Loop control APIs.

There are two PLLs in RP2040. They are:

pll_sys - Used to generate up to a 133MHz system clock
pll_usb - Used to generate a 48MHz USB reference clock

For details on how the PLLs are calculated, please refer to the RP2040 datasheet.

Macro Definition Documentation

◆ PLL_RESET_NUM

#define PLL_RESET_NUM ( pll )

Returns the reset_num_t used to reset a given PLL instance.

Note this macro is intended to resolve at compile time, and does no parameter checking

Function Documentation

◆ pll_deinit()

void pll_deinit ( PLL pll )

Release/uninitialise specified PLL.

This will turn off the power to the specified PLL. Note this function does not currently check if the PLL is in use before powering it off so should be used with care.

Parameters

pll	pll_sys or pll_usb

◆ pll_init()

void pll_init	(	PLL	pll,
		uint	ref_div,
		uint	vco_freq,
		uint	post_div1,
		uint	post_div2
	)

Initialise specified PLL.