107 lines
2.5 KiB
C
107 lines
2.5 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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#include "mpxxdtyy.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_REGISTER(mpxxdtyy);
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u16_t sw_filter_lib_init(struct device *dev, struct dmic_cfg *cfg)
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{
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struct mpxxdtyy_data *const data = DEV_DATA(dev);
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TPDMFilter_InitStruct *pdm_filter = &data->pdm_filter;
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u16_t factor;
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u32_t audio_freq = cfg->streams->pcm_rate;
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/* calculate oversampling factor based on pdm clock */
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for (factor = 64; factor <= 128; factor += 64) {
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u32_t pdm_bit_clk = (audio_freq * factor *
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cfg->channel.req_num_chan);
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if (pdm_bit_clk >= cfg->io.min_pdm_clk_freq &&
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pdm_bit_clk <= cfg->io.max_pdm_clk_freq) {
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break;
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}
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}
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if (factor != 64 && factor != 128) {
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return 0;
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}
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/* init the filter lib */
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pdm_filter->LP_HZ = audio_freq / 2;
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pdm_filter->HP_HZ = 10;
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pdm_filter->Fs = audio_freq;
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pdm_filter->Out_MicChannels = 1;
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pdm_filter->In_MicChannels = 1;
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pdm_filter->Decimation = factor;
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pdm_filter->MaxVolume = 64;
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Open_PDM_Filter_Init(pdm_filter);
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return factor;
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}
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int sw_filter_lib_run(TPDMFilter_InitStruct *pdm_filter,
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void *pdm_block, void *pcm_block,
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size_t pdm_size, size_t pcm_size)
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{
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int i;
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if (pdm_block == NULL || pcm_block == NULL || pdm_filter == NULL) {
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return -EINVAL;
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}
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for (i = 0; i < pdm_size/2; i++) {
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((u16_t *)pdm_block)[i] = HTONS(((u16_t *)pdm_block)[i]);
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}
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switch (pdm_filter->Decimation) {
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case 64:
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Open_PDM_Filter_64((u8_t *) pdm_block, pcm_block,
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pcm_size, pdm_filter);
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break;
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case 128:
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Open_PDM_Filter_128((u8_t *) pdm_block, pcm_block,
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pcm_size, pdm_filter);
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static const struct _dmic_ops mpxxdtyy_driver_api = {
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#ifdef DT_ST_MPXXDTYY_BUS_I2S
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.configure = mpxxdtyy_i2s_configure,
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.trigger = mpxxdtyy_i2s_trigger,
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.read = mpxxdtyy_i2s_read,
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#endif /* DT_ST_MPXXDTYY_BUS_I2S */
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};
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static int mpxxdtyy_initialize(struct device *dev)
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{
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struct mpxxdtyy_data *const data = DEV_DATA(dev);
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data->comm_master = device_get_binding(DT_ST_MPXXDTYY_0_BUS_NAME);
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if (data->comm_master == NULL) {
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LOG_ERR("master %s not found", DT_ST_MPXXDTYY_0_BUS_NAME);
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return -EINVAL;
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}
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data->state = DMIC_STATE_INITIALIZED;
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return 0;
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}
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static struct mpxxdtyy_data mpxxdtyy_data;
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DEVICE_AND_API_INIT(mpxxdtyy, DT_ST_MPXXDTYY_0_LABEL, mpxxdtyy_initialize,
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&mpxxdtyy_data, NULL, POST_KERNEL,
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CONFIG_AUDIO_DMIC_INIT_PRIORITY, &mpxxdtyy_driver_api);
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