rcc.c File Reference

#include <stddef.h>
#include <libopencm3/cm3/assert.h>
#include <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/pwr.h>
#include <libopencm3/stm32/flash.h>

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Macros
#define	HZ_PER_MHZ   1000000UL
#define	HZ_PER_KHZ   1000UL

Functions
static void	rcc_configure_pll (uint32_t clkin, const struct pll_config *config, int pll_num)
static void	rcc_set_and_enable_plls (const struct rcc_pll_config *config)
static uint16_t	rcc_prediv_log_skip32_div (uint16_t clk_mhz, uint32_t div_val)
static uint16_t	rcc_prediv_3bit_log_div (uint16_t clk_mhz, uint32_t div_val)
static void	rcc_clock_setup_domain1 (const struct rcc_pll_config *config)
static void	rcc_clock_setup_domain2 (const struct rcc_pll_config *config)
static void	rcc_clock_setup_domain3 (const struct rcc_pll_config *config)
void	rcc_clock_setup_pll (const struct rcc_pll_config *config)
	Setup the base PLLs and clock domains for the STM32H7. More...
uint32_t	rcc_get_bus_clk_freq (enum rcc_clock_source source)
	Get the clock rate (in Hz) of the specified clock source. More...
uint32_t	rcc_get_usart_clk_freq (uint32_t usart)
	Get the peripheral clock speed for the USART at base specified. More...
uint32_t	rcc_get_timer_clk_freq (uint32_t timer)
	Get the peripheral clock speed for the Timer at base specified. More...
uint32_t	rcc_get_i2c_clk_freq (uint32_t i2c)
	Get the peripheral clock speed for the I2C device at base specified. More...
uint32_t	rcc_get_spi_clk_freq (uint32_t spi)
	Get the peripheral clock speed for the SPI device at base specified. More...
uint32_t	rcc_get_fdcan_clk_freq (uint32_t fdcan)
	Get the peripheral clock speed for the FDCAN device at base specified. More...
void	rcc_set_peripheral_clk_sel (uint32_t periph, uint32_t sel)
	Set the clksel value for the specified peripheral. More...
void	rcc_set_fdcan_clksel (uint8_t clksel)
	Set the clock select for the FDCAN devices. More...
void	rcc_set_rng_clksel (uint8_t clksel)
	Set the clock select for the RNG device. More...
void	rcc_set_spi123_clksel (uint8_t clksel)
	Set the clock select for the SPI 1/2/3 devices. More...
void	rcc_set_spi45_clksel (uint8_t clksel)
	Set the clock select for the SPI 4/5 devices. More...

Variables
struct {
uint16_t   sysclk_mhz
uint16_t   cpu_mhz
uint16_t   hclk_mhz
struct {
uint16_t   pclk1_mhz
uint16_t   pclk2_mhz
uint16_t   pclk3_mhz
uint16_t   pclk4_mhz
}   per
struct pll_clocks {
uint16_t   p_mhz
uint16_t   q_mhz
uint16_t   r_mhz
}   pll1
struct pll_clocks {
uint16_t   p_mhz
uint16_t   q_mhz
uint16_t   r_mhz
}   pll2
struct pll_clocks {
uint16_t   p_mhz
uint16_t   q_mhz
uint16_t   r_mhz
}   pll3
uint16_t   hse_khz
}	rcc_clock_tree

Macro Definition Documentation

HZ_PER_KHZ

#define HZ_PER_KHZ   1000UL

Definition at line 16 of file rcc.c.

HZ_PER_MHZ

#define HZ_PER_MHZ   1000000UL

Definition at line 15 of file rcc.c.

Function Documentation

rcc_clock_setup_domain1()

static void rcc_clock_setup_domain1 ( const struct rcc_pll_config *  config )

static

Definition at line 146 of file rcc.c.

References rcc_pll_config::core_pre, rcc_pll_config::hpre, rcc_pll_config::ppre3, rcc_clock_tree, RCC_D1CFGR, RCC_D1CFGR_D1CPRE, RCC_D1CFGR_D1HPRE, RCC_D1CFGR_D1PPRE, rcc_prediv_3bit_log_div(), and rcc_prediv_log_skip32_div().

Referenced by rcc_clock_setup_pll().

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rcc_clock_setup_domain2()

static void rcc_clock_setup_domain2 ( const struct rcc_pll_config *  config )

static

Definition at line 160 of file rcc.c.

References rcc_pll_config::ppre1, rcc_pll_config::ppre2, rcc_clock_tree, RCC_D2CFGR, RCC_D2CFGR_D2PPRE1, RCC_D2CFGR_D2PPRE2, and rcc_prediv_3bit_log_div().

Referenced by rcc_clock_setup_pll().

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rcc_clock_setup_domain3()

static void rcc_clock_setup_domain3 ( const struct rcc_pll_config *  config )

static

Definition at line 172 of file rcc.c.

References rcc_pll_config::ppre4, rcc_clock_tree, RCC_D3CFGR, RCC_D3CFGR_D3PPRE, and rcc_prediv_3bit_log_div().

Referenced by rcc_clock_setup_pll().

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rcc_configure_pll()

static void rcc_configure_pll ( uint32_t  clkin, const struct pll_config *  config, int  pll_num  )

static

Definition at line 45 of file rcc.c.

References HZ_PER_MHZ, rcc_clock_tree, RCC_CR, RCC_CR_PLL1ON, RCC_CR_PLL1RDY, RCC_PLLCFGR, RCC_PLLCFGR_DIVP1EN, RCC_PLLCFGR_DIVQ1EN, RCC_PLLCFGR_DIVR1EN, RCC_PLLCFGR_PLL1RGE_SHIFT, RCC_PLLCFGR_PLL1VCO_MED, RCC_PLLCFGR_PLLRGE_2_4MHZ, RCC_PLLCFGR_PLLRGE_4_8MHZ, RCC_PLLCFGR_PLLRGE_8_16MHZ, RCC_PLLDIVR, RCC_PLLNDIVR_DIVN, RCC_PLLNDIVR_DIVP, RCC_PLLNDIVR_DIVQ, and RCC_PLLNDIVR_DIVR.

Referenced by rcc_set_and_enable_plls().

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rcc_prediv_3bit_log_div()

static uint16_t rcc_prediv_3bit_log_div ( uint16_t  clk_mhz, uint32_t  div_val  )

static

Definition at line 138 of file rcc.c.

Referenced by rcc_clock_setup_domain1(), rcc_clock_setup_domain2(), and rcc_clock_setup_domain3().

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rcc_prediv_log_skip32_div()

static uint16_t rcc_prediv_log_skip32_div ( uint16_t  clk_mhz, uint32_t  div_val  )

static

Definition at line 126 of file rcc.c.

References RCC_D1CFGR_D1CPRE_DIV16.

Referenced by rcc_clock_setup_domain1().

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rcc_set_and_enable_plls()

static void rcc_set_and_enable_plls ( const struct rcc_pll_config *  config )

static

Definition at line 107 of file rcc.c.

References rcc_pll_config::pll_config::divm, rcc_pll_config::hse_frequency, rcc_pll_config::pll1, rcc_pll_config::pll2, rcc_pll_config::pll3, rcc_pll_config::pll_source, rcc_configure_pll(), RCC_HSI_BASE_FREQUENCY, RCC_PLLCFGR, RCC_PLLCKSELR, RCC_PLLCKSELR_DIVM1, RCC_PLLCKSELR_DIVM2, RCC_PLLCKSELR_DIVM3, and RCC_PLLCKSELR_PLLSRC_HSI.

Referenced by rcc_clock_setup_pll().

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Variable Documentation

cpu_mhz

uint16_t cpu_mhz

Definition at line 21 of file rcc.c.

hclk_mhz

uint16_t hclk_mhz

Definition at line 22 of file rcc.c.

hse_khz

uint16_t hse_khz

Definition at line 34 of file rcc.c.

p_mhz

uint16_t p_mhz

Definition at line 30 of file rcc.c.

pclk1_mhz

uint16_t pclk1_mhz

Definition at line 24 of file rcc.c.

pclk2_mhz

uint16_t pclk2_mhz

Definition at line 25 of file rcc.c.

pclk3_mhz

uint16_t pclk3_mhz

Definition at line 26 of file rcc.c.

pclk4_mhz

uint16_t pclk4_mhz

Definition at line 27 of file rcc.c.

struct { ... } per

struct { ... } ::pll_clocks pll1

struct { ... } ::pll_clocks pll2

struct { ... } ::pll_clocks pll3

q_mhz

uint16_t q_mhz

Definition at line 31 of file rcc.c.

r_mhz

uint16_t r_mhz

Definition at line 32 of file rcc.c.

struct { ... } rcc_clock_tree

Initial value:

= {
        .sysclk_mhz = RCC_HSI_BASE_FREQUENCY / HZ_PER_MHZ,
        .cpu_mhz = RCC_HSI_BASE_FREQUENCY / HZ_PER_MHZ,
        .hclk_mhz = RCC_HSI_BASE_FREQUENCY / HZ_PER_MHZ,
        .per.pclk1_mhz = RCC_HSI_BASE_FREQUENCY / HZ_PER_MHZ,
        .per.pclk2_mhz = RCC_HSI_BASE_FREQUENCY / HZ_PER_MHZ,
        .per.pclk3_mhz = RCC_HSI_BASE_FREQUENCY / HZ_PER_MHZ,
        .per.pclk4_mhz = RCC_HSI_BASE_FREQUENCY / HZ_PER_MHZ
}

Referenced by rcc_clock_setup_domain1(), rcc_clock_setup_domain2(), rcc_clock_setup_domain3(), rcc_clock_setup_pll(), rcc_configure_pll(), rcc_get_bus_clk_freq(), rcc_get_fdcan_clk_freq(), rcc_get_i2c_clk_freq(), rcc_get_spi_clk_freq(), rcc_get_timer_clk_freq(), and rcc_get_usart_clk_freq().

sysclk_mhz

uint16_t sysclk_mhz

Definition at line 20 of file rcc.c.