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/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2019-11-17 LiWeiHao First implementation
*/
#include "drv_mic.h"
#include "fsl_common.h"
#include "fsl_iocon.h"
#include "fsl_dmic.h"
#include "fsl_dma.h"
#include "fsl_dmic_dma.h"
struct mic_device
{
dma_handle_t dma_handle;
dmic_dma_handle_t dmic_dma_handle;
struct rt_audio_device audio;
struct rt_audio_configure config;
rt_uint8_t *rx_fifo;
};
#define DMAREQ_DMIC0 16U
#define DMAREQ_DMIC1 17U
#define DMAREQ_CHANNEL DMAREQ_DMIC0
#define DMIC_CHANNEL kDMIC_Channel0
#define DMIC_CHANNEL_ENABLE DMIC_CHANEN_EN_CH0(1)
#define FIFO_DEPTH 15U
#define RX_DMA_FIFO_SIZE (2048)
struct mic_device mic_dev;
void dmic_dma_transfer_callback(DMIC_Type *base,
dmic_dma_handle_t *handle,
status_t status,
void *userData)
{
struct mic_device *mic_dev = (struct mic_device *)userData;
rt_audio_rx_done(&mic_dev->audio, &mic_dev->rx_fifo[0], RX_DMA_FIFO_SIZE);
dmic_transfer_t dmic_transfer;
dmic_transfer.data = (uint16_t *)&mic_dev->rx_fifo[0];
dmic_transfer.dataSize = RX_DMA_FIFO_SIZE / 2;
DMIC_TransferReceiveDMA(DMIC0, &mic_dev->dmic_dma_handle, &dmic_transfer, kDMIC_Channel0);
}
rt_err_t mic_device_init(struct rt_audio_device *audio)
{
dmic_channel_config_t dmic_channel_cfg;
CLOCK_EnableClock(kCLOCK_Iocon);
CLOCK_EnableClock(kCLOCK_InputMux);
CLOCK_EnableClock(kCLOCK_Gpio0);
IOCON_PinMuxSet(IOCON, 1, 16, IOCON_FUNC1 | IOCON_DIGITAL_EN);
IOCON_PinMuxSet(IOCON, 1, 15, IOCON_FUNC1 | IOCON_DIGITAL_EN);
CLOCK_AttachClk(kFRO12M_to_DMIC);
CLOCK_SetClkDiv(kCLOCK_DivDmicClk, 14, false);
dmic_channel_cfg.divhfclk = kDMIC_PdmDiv1;
dmic_channel_cfg.osr = 25U;
dmic_channel_cfg.gainshft = 2U;
dmic_channel_cfg.preac2coef = kDMIC_CompValueZero;
dmic_channel_cfg.preac4coef = kDMIC_CompValueZero;
dmic_channel_cfg.dc_cut_level = kDMIC_DcCut155;
dmic_channel_cfg.post_dc_gain_reduce = 1;
dmic_channel_cfg.saturate16bit = 1U;
dmic_channel_cfg.sample_rate = kDMIC_PhyFullSpeed;
DMIC_Init(DMIC0);
DMIC_ConfigIO(DMIC0, kDMIC_PdmDual);
DMIC_Use2fs(DMIC0, true);
DMIC_SetOperationMode(DMIC0, kDMIC_OperationModeDma);
DMIC_ConfigChannel(DMIC0, DMIC_CHANNEL, kDMIC_Left, &dmic_channel_cfg);
DMIC_FifoChannel(DMIC0, DMIC_CHANNEL, FIFO_DEPTH, true, true);
DMIC_EnableChannnel(DMIC0, DMIC_CHANNEL_ENABLE);
DMA_EnableChannel(DMA0, DMAREQ_CHANNEL);
/* Request dma channels from DMA manager. */
DMA_CreateHandle(&mic_dev.dma_handle, DMA0, DMAREQ_CHANNEL);
/* Create DMIC DMA handle. */
DMIC_TransferCreateHandleDMA(DMIC0,
&mic_dev.dmic_dma_handle,
dmic_dma_transfer_callback,
(void *)&mic_dev,
&mic_dev.dma_handle);
return RT_EOK;
}
rt_err_t mic_device_start(struct rt_audio_device *audio, int stream)
{
struct mic_device *mic_dev = (struct mic_device *)audio->parent.user_data;
if (stream == AUDIO_STREAM_RECORD)
{
dmic_transfer_t dmic_transfer;
dmic_transfer.data = (uint16_t *)&mic_dev->rx_fifo[0];
dmic_transfer.dataSize = RX_DMA_FIFO_SIZE / 2;
DMIC_TransferReceiveDMA(DMIC0, &mic_dev->dmic_dma_handle, &dmic_transfer, kDMIC_Channel0);
}
return RT_EOK;
}
rt_err_t mic_device_stop(struct rt_audio_device *audio, int stream)
{
struct mic_device *mic_dev = (struct mic_device *)audio->parent.user_data;
if (stream == AUDIO_STREAM_RECORD)
{
DMIC_TransferAbortReceiveDMA(DMIC0, &mic_dev->dmic_dma_handle);
}
return RT_EOK;
}
rt_err_t mic_device_getcaps(struct rt_audio_device *audio, struct rt_audio_caps *caps)
{
return RT_EOK;
}
rt_err_t mic_device_configure(struct rt_audio_device *audio, struct rt_audio_caps *caps)
{
return RT_EOK;
}
static struct rt_audio_ops _mic_audio_ops =
{
.getcaps = mic_device_getcaps,
.configure = mic_device_configure,
.init = mic_device_init,
.start = mic_device_start,
.stop = mic_device_stop,
.transmit = RT_NULL,
.buffer_info = RT_NULL,
};
int rt_hw_mic_init(void)
{
struct rt_audio_device *audio = &mic_dev.audio;
/* mic default */
mic_dev.rx_fifo = rt_calloc(1, RX_DMA_FIFO_SIZE);
if (mic_dev.rx_fifo == RT_NULL)
{
return -RT_ENOMEM;
}
mic_dev.config.channels = 1;
mic_dev.config.samplerate = 16000;
mic_dev.config.samplebits = 16;
/* register mic device */
audio->ops = &_mic_audio_ops;
rt_audio_register(audio, "mic0", RT_DEVICE_FLAG_RDONLY, (void *)&mic_dev);
return RT_EOK;
}
INIT_DEVICE_EXPORT(rt_hw_mic_init);
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