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SourceVuESP-IDF Framework and ExamplesESP-IDFi2s_get_source_clk_freq()

i2s_get_source_clk_freq() function

Get the frequency of the source clock

Syntax

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Summary

Declaration

Definition

from i2s_private.h:282

uint32_t i2s_get_source_clk_freq(i2s_clock_src_t clk_src, uint32_t mclk_freq_hz);

Implemented in i2s_common.c:562

Arguments

Argument

Description

clk_src

clock source

mclk_freq_hz

Expected mclk frequency in Hz

Return value

- Actual source clock frequency

References

Code

Location

Referrer

uint32_t i2s_get_source_clk_freq(i2s_clock_src_t clk_src, uint32_t mclk_freq_hz)

i2s_common.c:562

uint32_t i2s_get_source_clk_freq(i2s_clock_src_t clk_src, uint32_t mclk_freq_hz);

i2s_private.h:282

clk_info->sclk = i2s_get_source_clk_freq(clk_cfg->clk_src, clk_info->mclk);

i2s_pdm.c:44

i2s_pdm_tx_calculate_clock()

clk_info->sclk = i2s_get_source_clk_freq(clk_cfg->clk_src, clk_info->mclk);

i2s_pdm.c:340

i2s_pdm_rx_calculate_clock()

clk_info->sclk = i2s_get_source_clk_freq(clk_cfg->clk_src, clk_info->mclk);

i2s_std.c:56

i2s_std_calculate_clock()

Call Tree

i2s_get_source_clk_freq() is called by 3 functions and calls 2 functions:

i2s_std_calculate_clock()

i2s_pdm_tx_calculate_clock()

i2s_pdm_rx_calculate_clock()

i2s_get_source_clk_freq()

esp_clk_tree_src_get_freq_hz()

i2s_set_get_apll_freq()

Data Use

i2s_get_source_clk_freq() reads 2 variables:

soc_periph_i2s_clk_src_t::I2S_CLK_SRC_APLL

esp_clk_tree_src_freq_precision_t::ESP_CLK_TREE_SRC_FREQ_PRECISION_CACHED

i2s_get_source_clk_freq()

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