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i2s: fixed tdm mclk doubled issue

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Closes: https://github.com/espressif/esp-idf/issues/10196
This commit is contained in:
laokaiyao 2022-11-18 10:40:03 +08:00
parent 919b3e621e
commit 85661a037f
1 changed files with 6 additions and 8 deletions
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14
components/driver/i2s/i2s_tdm.c
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@ -40,14 +40,12 @@ static esp_err_t i2s_tdm_calculate_clock(i2s_chan_handle_t handle, const i2s_tdm
clk_info->bclk = rate * handle->total_slot * slot_bits;
clk_info->mclk = rate * clk_cfg->mclk_multiple;
clk_info->bclk_div = clk_info->mclk / clk_info->bclk;
/* While RECEIVING multiple slots, the data will go wrong if the bclk_div is euqal or smaller than 2 */
do {
clk_info->mclk *= 2;
clk_info->bclk_div = clk_info->mclk / clk_info->bclk;
if (clk_info->bclk_div <= 2) {
ESP_LOGW(TAG, "the current mclk multiple is too small, adjust the mclk multiple to %"PRIu32, clk_info->mclk / rate);
}
} while (clk_info->bclk_div <= 2);
/* While RECEIVING multiple slots, the data will go wrong if the bclk_div is equal or smaller than 2 */
if (clk_info->bclk_div <= 2) {
clk_info->bclk_div = 3;
clk_info->mclk = clk_info->bclk * clk_info->bclk_div;
ESP_LOGW(TAG, "the current mclk multiple is too small, adjust the mclk multiple to %"PRIu32, clk_info->mclk / rate);
}
} else {
/* For slave mode, mclk >= bclk * 8, so fix bclk_div to 2 first */
clk_info->bclk_div = 8;