147 lines
3.6 KiB
C
147 lines
3.6 KiB
C
/*
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* Copyright (c) 2018 STMicroelectronics
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#define DT_DRV_COMPAT st_mpxxdtyy
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#include "mpxxdtyy.h"
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#include <drivers/i2s.h>
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#define LOG_LEVEL CONFIG_AUDIO_DMIC_LOG_LEVEL
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#include <logging/log.h>
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LOG_MODULE_DECLARE(mpxxdtyy);
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#if DT_ANY_INST_ON_BUS_STATUS_OKAY(i2s)
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#define NUM_RX_BLOCKS 4
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#define PDM_BLOCK_MAX_SIZE_BYTES 512
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K_MEM_SLAB_DEFINE(rx_pdm_i2s_mslab, PDM_BLOCK_MAX_SIZE_BYTES, NUM_RX_BLOCKS, 1);
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int mpxxdtyy_i2s_read(const struct device *dev, uint8_t stream, void **buffer,
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size_t *size, int32_t timeout)
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{
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int ret;
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const struct mpxxdtyy_config *config = dev->config;
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struct mpxxdtyy_data *const data = dev->data;
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void *pdm_block, *pcm_block;
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size_t pdm_size;
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TPDMFilter_InitStruct *pdm_filter = &data->pdm_filter[0];
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ret = i2s_read(config->comm_master, &pdm_block, &pdm_size);
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if (ret != 0) {
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LOG_ERR("read failed (%d)", ret);
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return ret;
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}
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ret = k_mem_slab_alloc(data->pcm_mem_slab,
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&pcm_block, K_NO_WAIT);
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if (ret < 0) {
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return ret;
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}
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sw_filter_lib_run(pdm_filter, pdm_block, pcm_block, pdm_size,
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data->pcm_mem_size);
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k_mem_slab_free(&rx_pdm_i2s_mslab, &pdm_block);
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*buffer = pcm_block;
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*size = data->pcm_mem_size;
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return 0;
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}
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int mpxxdtyy_i2s_trigger(const struct device *dev, enum dmic_trigger cmd)
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{
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int ret;
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const struct mpxxdtyy_config *config = dev->config;
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struct mpxxdtyy_data *const data = dev->data;
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enum i2s_trigger_cmd i2s_cmd;
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enum dmic_state tmp_state;
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switch (cmd) {
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case DMIC_TRIGGER_START:
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if (data->state == DMIC_STATE_CONFIGURED) {
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tmp_state = DMIC_STATE_ACTIVE;
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i2s_cmd = I2S_TRIGGER_START;
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} else {
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return 0;
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}
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break;
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case DMIC_TRIGGER_STOP:
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if (data->state == DMIC_STATE_ACTIVE) {
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tmp_state = DMIC_STATE_CONFIGURED;
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i2s_cmd = I2S_TRIGGER_STOP;
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} else {
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return 0;
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}
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break;
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default:
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return -EINVAL;
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}
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ret = i2s_trigger(config->comm_master, I2S_DIR_RX, i2s_cmd);
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if (ret != 0) {
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LOG_ERR("trigger failed with %d error", ret);
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return ret;
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}
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data->state = tmp_state;
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return 0;
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}
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int mpxxdtyy_i2s_configure(const struct device *dev, struct dmic_cfg *cfg)
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{
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int ret;
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const struct mpxxdtyy_config *config = dev->config;
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struct mpxxdtyy_data *const data = dev->data;
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uint8_t chan_size = cfg->streams->pcm_width;
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uint32_t audio_freq = cfg->streams->pcm_rate;
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uint16_t factor;
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/* PCM buffer size */
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data->pcm_mem_slab = cfg->streams->mem_slab;
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data->pcm_mem_size = cfg->streams->block_size;
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/* check requested min pdm frequency */
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if (cfg->io.min_pdm_clk_freq < MPXXDTYY_MIN_PDM_FREQ ||
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cfg->io.min_pdm_clk_freq > cfg->io.max_pdm_clk_freq) {
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return -EINVAL;
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}
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/* check requested max pdm frequency */
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if (cfg->io.max_pdm_clk_freq > MPXXDTYY_MAX_PDM_FREQ ||
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cfg->io.max_pdm_clk_freq < cfg->io.min_pdm_clk_freq) {
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return -EINVAL;
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}
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factor = sw_filter_lib_init(dev, cfg);
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if (factor == 0U) {
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return -EINVAL;
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}
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/* configure I2S channels */
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struct i2s_config i2s_cfg;
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i2s_cfg.word_size = chan_size;
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i2s_cfg.channels = cfg->channel.req_num_chan;
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i2s_cfg.format = I2S_FMT_DATA_FORMAT_LEFT_JUSTIFIED |
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I2S_FMT_BIT_CLK_INV;
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i2s_cfg.options = I2S_OPT_FRAME_CLK_MASTER | I2S_OPT_BIT_CLK_MASTER;
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i2s_cfg.frame_clk_freq = audio_freq * factor / chan_size;
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i2s_cfg.block_size = data->pcm_mem_size * (factor / chan_size);
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i2s_cfg.mem_slab = &rx_pdm_i2s_mslab;
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i2s_cfg.timeout = 2000;
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ret = i2s_configure(config->comm_master, I2S_DIR_RX, &i2s_cfg);
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if (ret != 0) {
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LOG_ERR("I2S device configuration error");
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return ret;
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}
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data->state = DMIC_STATE_CONFIGURED;
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return 0;
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}
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#endif /* DT_ANY_INST_ON_BUS_STATUS_OKAY(i2s) */
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