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i2s_pdm: fix tx frequency limitation

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Closes: https://github.com/espressif/esp-idf/issues/10420
This commit is contained in:
laokaiyao 2022-12-22 15:28:28 +08:00
parent f95c2274b8
commit 943dcd2cd1
8 changed files with 66 additions and 11 deletions
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1
components/driver/deprecated/i2s_legacy.c
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@ -1201,6 +1201,7 @@ esp_err_t i2s_set_pdm_tx_up_sample(i2s_port_t i2s_num, const i2s_pdm_tx_upsample
p_i2s[i2s_num]->clk_cfg.up_sample_fp = upsample_cfg->fp;
p_i2s[i2s_num]->clk_cfg.up_sample_fs = upsample_cfg->fs;
i2s_ll_tx_set_pdm_fpfs(p_i2s[i2s_num]->hal.dev, upsample_cfg->fp, upsample_cfg->fs);
i2s_ll_tx_set_pdm_over_sample_ratio(p_i2s[i2s_num]->hal.dev, upsample_cfg->fp / upsample_cfg->fs);
i2s_start(i2s_num);
xSemaphoreGive(p_i2s[i2s_num]->tx->mux);
return i2s_set_clk(i2s_num, p_i2s[i2s_num]->clk_cfg.sample_rate_hz, p_i2s[i2s_num]->slot_cfg.data_bit_width, p_i2s[i2s_num]->slot_cfg.slot_mode);

8
components/driver/i2s/i2s_pdm.c
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@ -35,7 +35,9 @@ static esp_err_t i2s_pdm_tx_calculate_clock(i2s_chan_handle_t handle, const i2s_
uint32_t rate = clk_cfg->sample_rate_hz;
i2s_pdm_tx_clk_config_t *pdm_tx_clk = (i2s_pdm_tx_clk_config_t *)clk_cfg;
clk_info->bclk = rate * I2S_LL_PDM_BCK_FACTOR * pdm_tx_clk->up_sample_fp / pdm_tx_clk->up_sample_fs;
// Over sampling ratio (integer, mostly should be 1 or 2)
uint32_t over_sample_ratio = pdm_tx_clk->up_sample_fp / pdm_tx_clk->up_sample_fs;
clk_info->bclk = rate * I2S_LL_PDM_BCK_FACTOR * over_sample_ratio;
clk_info->bclk_div = 8;
clk_info->mclk = clk_info->bclk * clk_info->bclk_div;
clk_info->sclk = i2s_get_source_clk_freq(clk_cfg->clk_src, clk_info->mclk);
@ -43,8 +45,9 @@ static esp_err_t i2s_pdm_tx_calculate_clock(i2s_chan_handle_t handle, const i2s_
/* Check if the configuration is correct */
ESP_RETURN_ON_FALSE(clk_info->mclk_div, ESP_ERR_INVALID_ARG, TAG, "sample rate is too large");
/* Set upsampling configuration */
/* Set up sampling configuration */
i2s_ll_tx_set_pdm_fpfs(handle->controller->hal.dev, pdm_tx_clk->up_sample_fp, pdm_tx_clk->up_sample_fs);
i2s_ll_tx_set_pdm_over_sample_ratio(handle->controller->hal.dev, over_sample_ratio);
return ESP_OK;
}
@ -53,6 +56,7 @@ static esp_err_t i2s_pdm_tx_set_clock(i2s_chan_handle_t handle, const i2s_pdm_tx
{
esp_err_t ret = ESP_OK;
i2s_pdm_tx_config_t *pdm_tx_cfg = (i2s_pdm_tx_config_t *)(handle->mode_info);
ESP_RETURN_ON_FALSE(clk_cfg->up_sample_fs <= 480, ESP_ERR_INVALID_ARG, TAG, "up_sample_fs should be within 480");
i2s_hal_clock_info_t clk_info;
/* Calculate clock parameters */

8
components/driver/include/driver/i2s_pdm.h
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@ -210,7 +210,7 @@ esp_err_t i2s_channel_reconfig_pdm_rx_gpio(i2s_chan_handle_t handle, const i2s_p
* 2: fp = 960, fs = 480, in this case, Fpdm = 128*Fpcm = 128*sample_rate_hz
* If the pdm receiver do not care the pdm serial clock, it's recommended set Fpdm = 128*48000.
* Otherwise, the second configuration should be adopted.
* @param rate sample rate
* @param rate sample rate (not suggest to exceed 48000 Hz, otherwise more glitches and noise may appear)
*/
#define I2S_PDM_TX_CLK_DEFAULT_CONFIG(rate) { \
.sample_rate_hz = rate, \
@ -256,7 +256,7 @@ typedef struct {
i2s_pdm_sig_scale_t lp_scale; /*!< Low pass filter scaling value */
i2s_pdm_sig_scale_t sinc_scale; /*!< Sinc filter scaling value */
#if SOC_I2S_HW_VERSION_2
i2s_pdm_tx_line_mode_t line_mode; /*!< PDM TX line mode, on-line codec, one-line dac, two-line dac mode can be selected */
i2s_pdm_tx_line_mode_t line_mode; /*!< PDM TX line mode, one-line codec, one-line dac, two-line dac mode can be selected */
bool hp_en; /*!< High pass filter enable */
float hp_cut_off_freq_hz; /*!< High pass filter cut-off frequency, range 23.3Hz ~ 185Hz, see cut-off frequency sheet above */
uint32_t sd_dither; /*!< Sigma-delta filter dither */
@ -269,12 +269,12 @@ typedef struct {
*/
typedef struct {
/* General fields */
uint32_t sample_rate_hz; /*!< I2S sample rate */
uint32_t sample_rate_hz; /*!< I2S sample rate, not suggest to exceed 48000 Hz, otherwise more glitches and noise may appear */
i2s_clock_src_t clk_src; /*!< Choose clock source */
i2s_mclk_multiple_t mclk_multiple; /*!< The multiple of mclk to the sample rate */
/* Particular fields */
uint32_t up_sample_fp; /*!< Up-sampling param fp */
uint32_t up_sample_fs; /*!< Up-sampling param fs */
uint32_t up_sample_fs; /*!< Up-sampling param fs, not allowed to be greater than 480 */
} i2s_pdm_tx_clk_config_t;
/**

12
components/hal/esp32/include/hal/i2s_ll.h
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@ -1044,6 +1044,17 @@ static inline void i2s_ll_tx_set_pdm_sd_scale(i2s_dev_t *hw, i2s_pdm_sig_scale_t
hw->pdm_conf.tx_sigmadelta_in_shift = sig_scale;
}
/**
* @brief Set the PDM TX over sampling ratio
*
* @param hw Peripheral I2S hardware instance address.
* @param ovr Over sampling ratio
*/
static inline void i2s_ll_tx_set_pdm_over_sample_ratio(i2s_dev_t *hw, uint32_t ovr)
{
hw->pdm_conf.tx_sinc_osr2 = ovr;
}
/**
* @brief Configure I2S TX PDM sample rate
* Fpdm = 64*Fpcm*fp/fs
@ -1056,7 +1067,6 @@ static inline void i2s_ll_tx_set_pdm_fpfs(i2s_dev_t *hw, uint32_t fp, uint32_t f
{
hw->pdm_freq_conf.tx_pdm_fp = fp;
hw->pdm_freq_conf.tx_pdm_fs = fs;
hw->pdm_conf.tx_sinc_osr2 = fp / fs;
}
/**

12
components/hal/esp32c3/include/hal/i2s_ll.h
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@ -877,6 +877,17 @@ static inline void i2s_ll_tx_set_pdm_sd_dither2(i2s_dev_t *hw, uint32_t dither2)
hw->tx_pcm2pdm_conf.tx_pdm_sigmadelta_dither2 = dither2;
}
/**
* @brief Set the PDM TX over sampling ratio
*
* @param hw Peripheral I2S hardware instance address.
* @param ovr Over sampling ratio
*/
static inline void i2s_ll_tx_set_pdm_over_sample_ratio(i2s_dev_t *hw, uint32_t ovr)
{
hw->tx_pcm2pdm_conf.tx_pdm_sinc_osr2 = ovr;
}
/**
* @brief Configure I2S TX PDM sample rate
* Fpdm = 64*Fpcm*fp/fs
@ -889,7 +900,6 @@ static inline void i2s_ll_tx_set_pdm_fpfs(i2s_dev_t *hw, uint32_t fp, uint32_t f
{
hw->tx_pcm2pdm_conf1.tx_pdm_fp = fp;
hw->tx_pcm2pdm_conf1.tx_pdm_fs = fs;
hw->tx_pcm2pdm_conf.tx_pdm_sinc_osr2 = fp / fs;
}
/**

12
components/hal/esp32c6/include/hal/i2s_ll.h
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@ -892,6 +892,17 @@ static inline void i2s_ll_tx_set_pdm_sd_dither2(i2s_dev_t *hw, uint32_t dither2)
hw->tx_pcm2pdm_conf.tx_pdm_sigmadelta_dither2 = dither2;
}
/**
* @brief Set the PDM TX over sampling ratio
*
* @param hw Peripheral I2S hardware instance address.
* @param ovr Over sampling ratio
*/
static inline void i2s_ll_tx_set_pdm_over_sample_ratio(i2s_dev_t *hw, uint32_t ovr)
{
hw->tx_pcm2pdm_conf.tx_pdm_sinc_osr2 = ovr;
}
/**
* @brief Configure I2S TX PDM sample rate
* Fpdm = 64*Fpcm*fp/fs
@ -904,7 +915,6 @@ static inline void i2s_ll_tx_set_pdm_fpfs(i2s_dev_t *hw, uint32_t fp, uint32_t f
{
hw->tx_pcm2pdm_conf1.tx_pdm_fp = fp;
hw->tx_pcm2pdm_conf1.tx_pdm_fs = fs;
hw->tx_pcm2pdm_conf.tx_pdm_sinc_osr2 = fp / fs;
}
/**

12
components/hal/esp32h4/include/hal/i2s_ll.h
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@ -878,6 +878,17 @@ static inline void i2s_ll_tx_set_pdm_sd_dither2(i2s_dev_t *hw, uint32_t dither2)
hw->tx_pcm2pdm_conf.tx_pdm_sigmadelta_dither2 = dither2;
}
/**
* @brief Set the PDM TX over sampling ratio
*
* @param hw Peripheral I2S hardware instance address.
* @param ovr Over sampling ratio
*/
static inline void i2s_ll_tx_set_pdm_over_sample_ratio(i2s_dev_t *hw, uint32_t ovr)
{
hw->tx_pcm2pdm_conf.tx_pdm_sinc_osr2 = ovr;
}
/**
* @brief Configure I2S TX PDM sample rate
* Fpdm = 64*Fpcm*fp/fs
@ -890,7 +901,6 @@ static inline void i2s_ll_tx_set_pdm_fpfs(i2s_dev_t *hw, uint32_t fp, uint32_t f
{
hw->tx_pcm2pdm_conf1.tx_pdm_fp = fp;
hw->tx_pcm2pdm_conf1.tx_pdm_fs = fs;
hw->tx_pcm2pdm_conf.tx_pdm_sinc_osr2 = fp / fs;
}
/**

12
components/hal/esp32s3/include/hal/i2s_ll.h
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@ -780,6 +780,17 @@ static inline void i2s_ll_rx_enable_pdm(i2s_dev_t *hw)
hw->rx_conf.rx_pdm2pcm_en = true;
}
/**
* @brief Set the PDM TX over sampling ratio
*
* @param hw Peripheral I2S hardware instance address.
* @param ovr Over sampling ratio
*/
static inline void i2s_ll_tx_set_pdm_over_sample_ratio(i2s_dev_t *hw, uint32_t ovr)
{
hw->tx_pcm2pdm_conf.tx_sinc_osr2 = ovr;
}
/**
* @brief Configure I2S TX PDM sample rate
* Fpdm = 64*Fpcm*fp/fs
@ -792,7 +803,6 @@ static inline void i2s_ll_tx_set_pdm_fpfs(i2s_dev_t *hw, uint32_t fp, uint32_t f
{
hw->tx_pcm2pdm_conf1.tx_pdm_fp = fp;
hw->tx_pcm2pdm_conf1.tx_pdm_fs = fs;
hw->tx_pcm2pdm_conf.tx_sinc_osr2 = fp / fs;
}
/**