blob: a83d4ee0f96833caeeba0b60c618be3d467e5c03 [file] [log] [blame]
/*
* Copyright (c) 2018 STMicroelectronics
*
* SPDX-License-Identifier: Apache-2.0
*/
#include "mpxxdtyy.h"
#include <i2s.h>
#define LOG_LEVEL CONFIG_AUDIO_DMIC_LOG_LEVEL
#include <logging/log.h>
LOG_MODULE_DECLARE(mpxxdtyy);
#ifdef DT_ST_MPXXDTYY_BUS_I2S
#define NUM_RX_BLOCKS 4
#define PDM_BLOCK_MAX_SIZE_BYTES 512
K_MEM_SLAB_DEFINE(rx_pdm_i2s_mslab, PDM_BLOCK_MAX_SIZE_BYTES, NUM_RX_BLOCKS, 1);
int mpxxdtyy_i2s_read(struct device *dev, u8_t stream, void **buffer,
size_t *size, s32_t timeout)
{
int ret;
struct mpxxdtyy_data *const data = DEV_DATA(dev);
void *pdm_block, *pcm_block;
size_t pdm_size;
TPDMFilter_InitStruct *pdm_filter = &data->pdm_filter;
ret = i2s_read(data->comm_master, &pdm_block, &pdm_size);
if (ret != 0) {
LOG_ERR("read failed (%d)", ret);
return ret;
}
ret = k_mem_slab_alloc(data->pcm_mem_slab,
&pcm_block, K_NO_WAIT);
if (ret < 0) {
return ret;
}
sw_filter_lib_run(pdm_filter, pdm_block, pcm_block, pdm_size,
data->pcm_mem_size);
k_mem_slab_free(&rx_pdm_i2s_mslab, &pdm_block);
*buffer = pcm_block;
*size = data->pcm_mem_size;
return 0;
}
int mpxxdtyy_i2s_trigger(struct device *dev, enum dmic_trigger cmd)
{
int ret;
struct mpxxdtyy_data *const data = DEV_DATA(dev);
enum i2s_trigger_cmd i2s_cmd;
enum dmic_state tmp_state;
switch (cmd) {
case DMIC_TRIGGER_START:
if (data->state == DMIC_STATE_CONFIGURED) {
tmp_state = DMIC_STATE_ACTIVE;
i2s_cmd = I2S_TRIGGER_START;
} else {
return 0;
}
break;
case DMIC_TRIGGER_STOP:
if (data->state == DMIC_STATE_ACTIVE) {
tmp_state = DMIC_STATE_CONFIGURED;
i2s_cmd = I2S_TRIGGER_STOP;
} else {
return 0;
}
break;
default:
return -EINVAL;
}
ret = i2s_trigger(data->comm_master, I2S_DIR_RX, i2s_cmd);
if (ret != 0) {
LOG_ERR("trigger failed with %d error", ret);
return ret;
}
data->state = tmp_state;
return 0;
}
int mpxxdtyy_i2s_configure(struct device *dev, struct dmic_cfg *cfg)
{
int ret;
struct mpxxdtyy_data *const data = DEV_DATA(dev);
u8_t chan_size = cfg->streams->pcm_width;
u32_t audio_freq = cfg->streams->pcm_rate;
u16_t factor;
/* PCM buffer size */
data->pcm_mem_slab = cfg->streams->mem_slab;
data->pcm_mem_size = cfg->streams->block_size;
/* check requested min pdm frequency */
if (cfg->io.min_pdm_clk_freq < MPXXDTYY_MIN_PDM_FREQ ||
cfg->io.min_pdm_clk_freq > cfg->io.max_pdm_clk_freq) {
return -EINVAL;
}
/* check requested max pdm frequency */
if (cfg->io.max_pdm_clk_freq > MPXXDTYY_MAX_PDM_FREQ ||
cfg->io.max_pdm_clk_freq < cfg->io.min_pdm_clk_freq) {
return -EINVAL;
}
factor = sw_filter_lib_init(dev, cfg);
if (factor == 0U) {
return -EINVAL;
}
/* configure I2S channels */
struct i2s_config i2s_cfg;
i2s_cfg.word_size = chan_size;
i2s_cfg.channels = cfg->channel.req_num_chan;
i2s_cfg.format = I2S_FMT_DATA_FORMAT_LEFT_JUSTIFIED |
I2S_FMT_BIT_CLK_INV;
i2s_cfg.options = I2S_OPT_FRAME_CLK_MASTER | I2S_OPT_BIT_CLK_MASTER;
i2s_cfg.frame_clk_freq = audio_freq * factor / chan_size;
i2s_cfg.block_size = data->pcm_mem_size * (factor / chan_size);
i2s_cfg.mem_slab = &rx_pdm_i2s_mslab;
i2s_cfg.timeout = 2000;
ret = i2s_configure(data->comm_master, I2S_DIR_RX, &i2s_cfg);
if (ret != 0) {
LOG_ERR("I2S device configuration error");
return ret;
}
data->state = DMIC_STATE_CONFIGURED;
return 0;
}
#endif /* DT_ST_MPXXDTYY_BUS_I2S */