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SourceVuESP-IDF Framework and ExamplesESP-IDFspi_ll_master_cal_clock()

spi_ll_master_cal_clock() function

Calculate the nearest frequency available for master.

Syntax

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Summary

Declaration

from spi_ll.h:668

static inline int spi_ll_master_cal_clock(int fapb, int hz, int duty_cycle, spi_ll_clock_val_t *out_reg);

Arguments

Argument

Description

fapb

APB clock of the system.

Frequency desired.

duty_cycle

Duty cycle desired.

out_reg

Output address to store the calculated clock configurations for the return frequency.

Return value

Actual (nearest) frequency.

References

Code

Location

Referrer

static inline int spi_ll_master_cal_clock(int fapb, int hz, int duty_cycle, spi_ll_clock_val_t *out_reg)

spi_ll.h:668

int eff_clk_n = spi_ll_master_cal_clock(timing_param->clk_src_hz, timing_param->expected_freq, timing_param->duty_cycle, &temp_conf.clock_reg);

spi_hal.c:84

spi_hal_cal_clock_conf()

return spi_ll_master_cal_clock(fapb, hz, duty_cycle, NULL);

spi_hal.c:110

spi_hal_master_cal_clock()

int freq = spi_ll_master_cal_clock(fapb, hz, duty_cycle, &reg_val);

spi_ll.h:750

spi_ll_master_set_clock()

Call Tree

spi_ll_master_cal_clock() is called by 3 functions and calls 1 function:

spi_ll_master_set_clock()

spi_hal_cal_clock_conf()

spi_hal_master_cal_clock()

spi_ll_master_cal_clock()

spi_ll_freq_for_pre_n()

Data Use

spi_ll_master_cal_clock() reads 3 variables and writes 5 variables:

spi_dev_s::::val

spi_dev_s::clock

SPI1

spi_ll_master_cal_clock()

spi_dev_s::::::clkcnt_l

spi_dev_s::::::clkcnt_h

spi_dev_s::::::clkcnt_n

spi_dev_s::::::clkdiv_pre

spi_dev_s::::::clk_equ_sysclk

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