esp-idf/components/hal/i2s_hal.c

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/*
* SPDX-FileCopyrightText: 2020-2022 Espressif Systems (Shanghai) CO LTD
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*
* SPDX-License-Identifier: Apache-2.0
*/
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// The HAL layer for I2S (common part)
#include "soc/soc.h"
#include "hal/i2s_hal.h"
#if SOC_I2S_HW_VERSION_2 && SOC_I2S_SUPPORTS_PDM_TX
/* PDM tx high pass filter cut-off frequency and coeffecients list
* [0]: cut-off frequency; [1]: param0; [2]: param5 */
static const float cut_off_coef[21][3] = {
{185, 0, 0}, {172, 0, 1}, {160, 1, 1},
{150, 1, 2}, {137, 2, 2}, {126, 2, 3},
{120, 0, 3}, {115, 3, 3}, {106, 1, 7},
{104, 2, 4}, {92, 4, 4}, {91.5, 2, 7},
{81, 4, 5}, {77.2, 3, 7}, {69, 5, 5},
{63, 4, 7}, {58, 5, 6}, {49, 5, 7},
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{46, 6, 6}, {35.5, 6, 7}, {23.3, 7, 7}
};
#endif
void i2s_hal_init(i2s_hal_context_t *hal, int port_id)
{
/* Get hardware instance */
hal->dev = I2S_LL_GET_HW(port_id);
}
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void i2s_hal_set_tx_clock(i2s_hal_context_t *hal, const i2s_hal_clock_info_t *clk_info, i2s_clock_src_t clk_src)
{
#if SOC_I2S_HW_VERSION_2
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i2s_ll_tx_enable_clock(hal->dev);
i2s_ll_mclk_bind_to_tx_clk(hal->dev);
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#endif
i2s_ll_tx_clk_set_src(hal->dev, clk_src);
i2s_ll_tx_set_mclk(hal->dev, clk_info->sclk, clk_info->mclk, clk_info->mclk_div);
i2s_ll_tx_set_bck_div_num(hal->dev, clk_info->bclk_div);
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}
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void i2s_hal_set_rx_clock(i2s_hal_context_t *hal, const i2s_hal_clock_info_t *clk_info, i2s_clock_src_t clk_src)
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{
#if SOC_I2S_HW_VERSION_2
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i2s_ll_rx_enable_clock(hal->dev);
i2s_ll_mclk_bind_to_rx_clk(hal->dev);
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#endif
i2s_ll_rx_clk_set_src(hal->dev, clk_src);
i2s_ll_rx_set_mclk(hal->dev, clk_info->sclk, clk_info->mclk, clk_info->mclk_div);
i2s_ll_rx_set_bck_div_num(hal->dev, clk_info->bclk_div);
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}
/*-------------------------------------------------------------------------
| STD Specific Slot Configurations |
-------------------------------------------------------------------------*/
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void i2s_hal_std_set_tx_slot(i2s_hal_context_t *hal, bool is_slave, const i2s_hal_slot_config_t *slot_cfg)
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{
uint32_t slot_bit_width = (int)slot_cfg->slot_bit_width < (int)slot_cfg->data_bit_width ?
slot_cfg->data_bit_width : slot_cfg->slot_bit_width;
i2s_ll_tx_reset(hal->dev);
i2s_ll_tx_set_slave_mod(hal->dev, is_slave); //TX Slave
i2s_ll_tx_set_sample_bit(hal->dev, slot_bit_width, slot_cfg->data_bit_width);
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i2s_ll_tx_enable_msb_shift(hal->dev, slot_cfg->std.bit_shift);
i2s_ll_tx_set_ws_width(hal->dev, slot_cfg->std.ws_width);
#if SOC_I2S_HW_VERSION_1
i2s_ll_tx_enable_mono_mode(hal->dev, slot_cfg->slot_mode == I2S_SLOT_MODE_MONO);
i2s_ll_tx_select_std_slot(hal->dev, slot_cfg->std.slot_mask, slot_cfg->slot_mode == I2S_SLOT_MODE_MONO);
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// According to the test, the behavior of tx_msb_right is opposite with TRM, TRM is wrong?
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i2s_ll_tx_enable_msb_right(hal->dev, slot_cfg->std.msb_right);
i2s_ll_tx_enable_right_first(hal->dev, slot_cfg->std.ws_pol);
/* Should always enable fifo */
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i2s_ll_tx_force_enable_fifo_mod(hal->dev, true);
#elif SOC_I2S_HW_VERSION_2
bool is_copy_mono = slot_cfg->slot_mode == I2S_SLOT_MODE_MONO && slot_cfg->std.slot_mask == I2S_STD_SLOT_BOTH;
i2s_ll_tx_enable_mono_mode(hal->dev, is_copy_mono);
i2s_ll_tx_select_std_slot(hal->dev, is_copy_mono ? I2S_STD_SLOT_LEFT : slot_cfg->std.slot_mask);
i2s_ll_tx_set_skip_mask(hal->dev, (slot_cfg->std.slot_mask != I2S_STD_SLOT_BOTH) &&
(slot_cfg->slot_mode == I2S_SLOT_MODE_STEREO));
i2s_ll_tx_set_half_sample_bit(hal->dev, slot_bit_width);
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i2s_ll_tx_set_ws_idle_pol(hal->dev, slot_cfg->std.ws_pol);
i2s_ll_tx_set_bit_order(hal->dev, slot_cfg->std.bit_order_lsb);
i2s_ll_tx_enable_left_align(hal->dev, slot_cfg->std.left_align);
i2s_ll_tx_enable_big_endian(hal->dev, slot_cfg->std.big_endian);
#endif
}
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void i2s_hal_std_set_rx_slot(i2s_hal_context_t *hal, bool is_slave, const i2s_hal_slot_config_t *slot_cfg)
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{
uint32_t slot_bit_width = (int)slot_cfg->slot_bit_width < (int)slot_cfg->data_bit_width ?
slot_cfg->data_bit_width : slot_cfg->slot_bit_width;
i2s_ll_rx_reset(hal->dev);
i2s_ll_rx_set_slave_mod(hal->dev, is_slave); //RX Slave
i2s_ll_rx_set_sample_bit(hal->dev, slot_bit_width, slot_cfg->data_bit_width);
i2s_ll_rx_enable_mono_mode(hal->dev, slot_cfg->slot_mode == I2S_SLOT_MODE_MONO);
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i2s_ll_rx_enable_msb_shift(hal->dev, slot_cfg->std.bit_shift);
i2s_ll_rx_set_ws_width(hal->dev, slot_cfg->std.ws_width);
#if SOC_I2S_HW_VERSION_1
i2s_ll_rx_select_std_slot(hal->dev, slot_cfg->std.slot_mask, slot_cfg->std.msb_right);
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i2s_ll_rx_enable_msb_right(hal->dev, slot_cfg->std.msb_right);
i2s_ll_rx_enable_right_first(hal->dev, slot_cfg->std.ws_pol);
/* Should always enable fifo */
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i2s_ll_rx_force_enable_fifo_mod(hal->dev, true);
#elif SOC_I2S_HW_VERSION_2
i2s_ll_rx_select_std_slot(hal->dev, slot_cfg->std.slot_mask);
i2s_ll_rx_set_half_sample_bit(hal->dev, slot_bit_width);
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i2s_ll_rx_set_ws_idle_pol(hal->dev, slot_cfg->std.ws_pol);
i2s_ll_rx_set_bit_order(hal->dev, slot_cfg->std.bit_order_lsb);
i2s_ll_rx_enable_left_align(hal->dev, slot_cfg->std.left_align);
i2s_ll_rx_enable_big_endian(hal->dev, slot_cfg->std.big_endian);
#endif
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}
void i2s_hal_std_enable_tx_channel(i2s_hal_context_t *hal)
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{
i2s_ll_tx_enable_std(hal->dev);
}
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void i2s_hal_std_enable_rx_channel(i2s_hal_context_t *hal)
{
i2s_ll_rx_enable_std(hal->dev);
}
/*-------------------------------------------------------------------------
| PDM Specific Slot Configurations |
-------------------------------------------------------------------------*/
#if SOC_I2S_SUPPORTS_PDM_TX
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void i2s_hal_pdm_set_tx_slot(i2s_hal_context_t *hal, bool is_slave, const i2s_hal_slot_config_t *slot_cfg)
{
bool is_mono = slot_cfg->slot_mode == I2S_SLOT_MODE_MONO;
i2s_ll_tx_reset(hal->dev);
i2s_ll_tx_set_slave_mod(hal->dev, is_slave); //TX Slave
i2s_ll_tx_enable_msb_shift(hal->dev, false);
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i2s_ll_tx_set_pdm_prescale(hal->dev, slot_cfg->pdm_tx.sd_prescale);
i2s_ll_tx_set_pdm_hp_scale(hal->dev, slot_cfg->pdm_tx.hp_scale);
i2s_ll_tx_set_pdm_lp_scale(hal->dev, slot_cfg->pdm_tx.lp_scale);
i2s_ll_tx_set_pdm_sinc_scale(hal->dev, slot_cfg->pdm_tx.sinc_scale);
i2s_ll_tx_set_pdm_sd_scale(hal->dev, slot_cfg->pdm_tx.sd_scale);
#if SOC_I2S_HW_VERSION_1
uint32_t slot_bit_width = (int)slot_cfg->slot_bit_width < (int)slot_cfg->data_bit_width ?
slot_cfg->data_bit_width : slot_cfg->slot_bit_width;
i2s_ll_tx_force_enable_fifo_mod(hal->dev, true);
i2s_ll_tx_set_sample_bit(hal->dev, slot_bit_width, slot_cfg->data_bit_width);
i2s_ll_tx_enable_mono_mode(hal->dev, is_mono);
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i2s_ll_tx_select_pdm_slot(hal->dev, slot_cfg->pdm_tx.slot_mask & I2S_STD_SLOT_BOTH, is_mono);
i2s_ll_tx_enable_msb_right(hal->dev, false);
i2s_ll_tx_enable_right_first(hal->dev, false);
#elif SOC_I2S_HW_VERSION_2
/* PDM TX line mode */
i2s_ll_tx_pdm_line_mode(hal->dev, slot_cfg->pdm_tx.line_mode);
/* Force use 32 bit in PDM TX stereo mode to satisfy the frequency */
uint32_t slot_bit_width = is_mono ? 16 : 32;
i2s_ll_tx_set_sample_bit(hal->dev, slot_bit_width, slot_bit_width);
i2s_ll_tx_set_half_sample_bit(hal->dev, 16); // Fixed to 16 in PDM mode
/* By default, taking the DMA data at the first half period of WS */
i2s_ll_tx_pdm_dma_take_mode(hal->dev, is_mono, true);
i2s_ll_tx_set_ws_idle_pol(hal->dev, false);
/* Slot mode seems not take effect according to the test, leave it default here */
i2s_ll_tx_pdm_slot_mode(hal->dev, is_mono, false, I2S_PDM_SLOT_BOTH);
uint8_t cnt = 0;
float min = 1000;
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float expt_cut_off = slot_cfg->pdm_tx.hp_cut_off_freq_hz;
/* Find the closest cut-off frequency and its coefficients */
for (int i = 0; i < 21; i++) {
float tmp = cut_off_coef[i][0] < expt_cut_off ? expt_cut_off - cut_off_coef[i][0] : cut_off_coef[i][0] - expt_cut_off;
if (tmp < min) {
min = tmp;
cnt = i;
}
}
i2s_ll_tx_enable_pdm_hp_filter(hal->dev, slot_cfg->pdm_tx.hp_en);
i2s_ll_tx_set_pdm_hp_filter_param0(hal->dev, cut_off_coef[cnt][1]);
i2s_ll_tx_set_pdm_hp_filter_param5(hal->dev, cut_off_coef[cnt][2]);
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i2s_ll_tx_set_pdm_sd_dither(hal->dev, slot_cfg->pdm_tx.sd_dither);
i2s_ll_tx_set_pdm_sd_dither2(hal->dev, slot_cfg->pdm_tx.sd_dither2);
#endif
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}
void i2s_hal_pdm_enable_tx_channel(i2s_hal_context_t *hal)
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{
i2s_ll_tx_enable_pdm(hal->dev);
}
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#endif
#if SOC_I2S_SUPPORTS_PDM_RX
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void i2s_hal_pdm_set_rx_slot(i2s_hal_context_t *hal, bool is_slave, const i2s_hal_slot_config_t *slot_cfg)
{
uint32_t slot_bit_width = (int)slot_cfg->slot_bit_width < (int)slot_cfg->data_bit_width ?
slot_cfg->data_bit_width : slot_cfg->slot_bit_width;
i2s_ll_rx_reset(hal->dev);
i2s_ll_rx_set_slave_mod(hal->dev, is_slave); //RX Slave
i2s_ll_rx_set_sample_bit(hal->dev, slot_bit_width, slot_cfg->data_bit_width);
#if SOC_I2S_HW_VERSION_1
i2s_ll_rx_enable_mono_mode(hal->dev, slot_cfg->slot_mode == I2S_SLOT_MODE_MONO);
i2s_ll_rx_select_pdm_slot(hal->dev, slot_cfg->pdm_rx.slot_mask);
i2s_ll_rx_force_enable_fifo_mod(hal->dev, true);
i2s_ll_rx_enable_msb_right(hal->dev, false);
i2s_ll_rx_enable_right_first(hal->dev, false);
#elif SOC_I2S_HW_VERSION_2
i2s_ll_tx_set_half_sample_bit(hal->dev, 16);
i2s_ll_rx_enable_mono_mode(hal->dev, false);
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#if SOC_I2S_PDM_MAX_RX_LINES > 1
uint32_t slot_mask = (slot_cfg->slot_mode == I2S_SLOT_MODE_STEREO && slot_cfg->pdm_rx.slot_mask <= I2S_PDM_SLOT_BOTH) ?
I2S_PDM_SLOT_BOTH : slot_cfg->pdm_rx.slot_mask;
#else
/* Set the channel mask to enable corresponding slots, always enable two slots for stereo mode */
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uint32_t slot_mask = slot_cfg->slot_mode == I2S_SLOT_MODE_STEREO ? I2S_PDM_SLOT_BOTH : slot_cfg->pdm_rx.slot_mask;
#endif // SOC_I2S_SUPPORTS_PDM_RX > 1
i2s_ll_rx_set_active_chan_mask(hal->dev, slot_mask);
#endif // SOC_I2S_SUPPORTS_PDM_RX
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}
void i2s_hal_pdm_enable_rx_channel(i2s_hal_context_t *hal)
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{
i2s_ll_rx_enable_pdm(hal->dev);
}
#endif
/*-------------------------------------------------------------------------
| TDM Specific Slot Configurations |
-------------------------------------------------------------------------*/
#if SOC_I2S_SUPPORTS_TDM
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void i2s_hal_tdm_set_tx_slot(i2s_hal_context_t *hal, bool is_slave, const i2s_hal_slot_config_t *slot_cfg)
{
uint32_t slot_bit_width = (int)slot_cfg->slot_bit_width < (int)slot_cfg->data_bit_width ?
slot_cfg->data_bit_width : slot_cfg->slot_bit_width;
uint32_t cnt;
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uint32_t msk = slot_cfg->tdm.slot_mask;
/* Get the maximum slot number */
cnt = 32 - __builtin_clz(msk);
/* There should be at least 2 slots in total even for mono mode */
cnt = cnt < 2 ? 2 : cnt;
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uint32_t total_slot = slot_cfg->tdm.total_slot > cnt ? slot_cfg->tdm.total_slot : cnt;
i2s_ll_tx_reset(hal->dev);
i2s_ll_tx_set_slave_mod(hal->dev, is_slave); //TX Slave
i2s_ll_tx_set_sample_bit(hal->dev, slot_bit_width, slot_cfg->data_bit_width);
i2s_ll_tx_enable_mono_mode(hal->dev, slot_cfg->slot_mode == I2S_SLOT_MODE_MONO);
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i2s_ll_tx_enable_msb_shift(hal->dev, slot_cfg->tdm.bit_shift);
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if (slot_cfg->tdm.ws_width == 0) { // 0: I2S_TDM_AUTO_WS_WIDTH
i2s_ll_tx_set_ws_width(hal->dev, (total_slot * slot_bit_width) / 2);
} else {
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i2s_ll_tx_set_ws_width(hal->dev, slot_cfg->tdm.ws_width);
}
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i2s_ll_tx_set_ws_idle_pol(hal->dev, slot_cfg->tdm.ws_pol);
i2s_ll_tx_set_chan_num(hal->dev, total_slot);
/* In mono mode, there only should be one slot enabled, other inactive slots will transmit same data as enabled slot */
i2s_ll_tx_set_active_chan_mask(hal->dev, (slot_cfg->slot_mode == I2S_SLOT_MODE_MONO) ?
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I2S_TDM_SLOT0 : (uint32_t)slot_cfg->tdm.slot_mask);
i2s_ll_tx_set_skip_mask(hal->dev, slot_cfg->tdm.skip_mask);
i2s_ll_tx_set_half_sample_bit(hal->dev, total_slot * slot_bit_width / 2);
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i2s_ll_tx_set_bit_order(hal->dev, slot_cfg->tdm.bit_order_lsb);
i2s_ll_tx_enable_left_align(hal->dev, slot_cfg->tdm.left_align);
i2s_ll_tx_enable_big_endian(hal->dev, slot_cfg->tdm.big_endian);
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}
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void i2s_hal_tdm_set_rx_slot(i2s_hal_context_t *hal, bool is_slave, const i2s_hal_slot_config_t *slot_cfg)
{
uint32_t slot_bit_width = (int)slot_cfg->slot_bit_width < (int)slot_cfg->data_bit_width ?
slot_cfg->data_bit_width : slot_cfg->slot_bit_width;
uint32_t cnt;
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uint32_t msk = slot_cfg->tdm.slot_mask;
/* Get the maximum slot number */
cnt = 32 - __builtin_clz(msk);
/* There should be at least 2 slots in total even for mono mode */
cnt = cnt < 2 ? 2 : cnt;
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uint32_t total_slot = slot_cfg->tdm.total_slot > cnt ? slot_cfg->tdm.total_slot : cnt;
i2s_ll_rx_reset(hal->dev);
i2s_ll_rx_set_slave_mod(hal->dev, is_slave); //RX Slave
i2s_ll_rx_set_sample_bit(hal->dev, slot_bit_width, slot_cfg->data_bit_width);
i2s_ll_rx_enable_mono_mode(hal->dev, slot_cfg->slot_mode == I2S_SLOT_MODE_MONO);
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i2s_ll_rx_enable_msb_shift(hal->dev, slot_cfg->tdm.bit_shift);
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if (slot_cfg->tdm.ws_width == 0) { // 0: I2S_TDM_AUTO_WS_WIDTH
i2s_ll_rx_set_ws_width(hal->dev, (total_slot * slot_bit_width) / 2);
} else {
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i2s_ll_rx_set_ws_width(hal->dev, slot_cfg->tdm.ws_width);
}
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i2s_ll_rx_set_ws_idle_pol(hal->dev, slot_cfg->tdm.ws_pol);
i2s_ll_rx_set_chan_num(hal->dev, total_slot);
/* In mono mode, there only should be one slot enabled, other inactive slots will transmit same data as enabled slot */
i2s_ll_rx_set_active_chan_mask(hal->dev, (slot_cfg->slot_mode == I2S_SLOT_MODE_MONO) ?
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I2S_TDM_SLOT0 : (uint32_t)slot_cfg->tdm.slot_mask);
i2s_ll_rx_set_half_sample_bit(hal->dev, total_slot * slot_bit_width / 2);
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i2s_ll_rx_set_bit_order(hal->dev, slot_cfg->tdm.bit_order_lsb);
i2s_ll_rx_enable_left_align(hal->dev, slot_cfg->tdm.left_align);
i2s_ll_rx_enable_big_endian(hal->dev, slot_cfg->tdm.big_endian);
}
void i2s_hal_tdm_enable_tx_channel(i2s_hal_context_t *hal)
{
i2s_ll_tx_enable_tdm(hal->dev);
}
void i2s_hal_tdm_enable_rx_channel(i2s_hal_context_t *hal)
{
i2s_ll_rx_enable_tdm(hal->dev);
}
#endif