mirror of
https://github.com/espressif/esp-idf.git
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Ma Jing Jing
53 lines
2.3 KiB
C
53 lines
2.3 KiB
C
/*
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* SPDX-FileCopyrightText: 2026 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#pragma once
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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/**
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* @brief ASRC rate conversion register configuration structure
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*/
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typedef struct {
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uint32_t stg1_bypass; /*!< Stage 1 bypass control
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- 0: Enable stage 1 processing
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- 1: Bypass stage 1 (pass-through) */
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uint32_t stg0_bypass; /*!< Stage 0 bypass control
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- 0: Enable stage 0 processing
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- 1: Bypass stage 0 (pass-through) */
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uint32_t frac_bypass; /*!< Fractional resampler bypass control
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- 0: Enable fractional resampler
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- 1: Bypass fractional resampler */
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uint32_t stg1_mode; /*!< Stage 1 operation mode
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- 1: Down-sampling by 2 (decimation)
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- 0: Up-sampling by 2 (interpolation) */
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uint32_t stg0_mode; /*!< Stage 0 operation mode
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- 1: Down-sampling by 2 (decimation)
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- 0: Up-sampling by 2 (interpolation) */
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uint32_t frac_ahead; /*!< Fractional resampler advance flag
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- 0: Normal operation
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- 1: Advance mode (implementation specific) */
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uint32_t frac_m; /*!< Fractional resampler numerator
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Used in ratio calculation: frac_m/frac_l
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Range: Depends on sample rate conversion ratio */
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uint32_t frac_l; /*!< Fractional resampler denominator
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Used in ratio calculation: frac_m/frac_l
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Range: Depends on sample rate conversion ratio */
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uint32_t frac_recipl; /*!< Fractional resampler reciprocal value
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Pre-calculated reciprocal for hardware efficiency
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Formula: ((1 << 20) + frac_l) / (2 * frac_l) */
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} asrc_periph_rate_config_t;
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extern const asrc_periph_rate_config_t asrc_periph_rate_table[6][6];
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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