591 lines
16 KiB
C
591 lines
16 KiB
C
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/**************************************************************************//**
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*
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* @copyright (C) 2020 Nuvoton Technology Corp. All rights reserved.
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2020-2-7 Wayne Lin First version
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*
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******************************************************************************/
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#include <rtconfig.h>
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#if defined(BSP_USING_I2S)
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#include <rtdevice.h>
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#include <drv_pdma.h>
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#include <drv_i2s.h>
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/* Private define ---------------------------------------------------------------*/
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#define DBG_ENABLE
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#define DBG_LEVEL DBG_LOG
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#define DBG_SECTION_NAME "i2s"
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#define DBG_COLOR
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#include <rtdbg.h>
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/* Private functions ------------------------------------------------------------*/
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static rt_err_t nu_i2s_getcaps(struct rt_audio_device *audio, struct rt_audio_caps *caps);
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static rt_err_t nu_i2s_configure(struct rt_audio_device *audio, struct rt_audio_caps *caps);
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static rt_err_t nu_i2s_init(struct rt_audio_device *audio);
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static rt_err_t nu_i2s_start(struct rt_audio_device *audio, int stream);
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static rt_err_t nu_i2s_stop(struct rt_audio_device *audio, int stream);
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static void nu_i2s_buffer_info(struct rt_audio_device *audio, struct rt_audio_buf_info *info);
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/* Public functions -------------------------------------------------------------*/
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rt_err_t nu_i2s_acodec_register(nu_acodec_ops_t);
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/* Private variables ------------------------------------------------------------*/
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static struct nu_i2s g_nu_i2s_dev =
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{
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.name = "sound0",
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.i2s_base = I2S0,
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.i2s_rst = I2S0_RST,
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.i2s_dais = {
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[NU_I2S_DAI_PLAYBACK] = {
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.pdma_perp = PDMA_I2S0_TX,
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},
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[NU_I2S_DAI_CAPTURE] = {
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.pdma_perp = PDMA_I2S0_RX,
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}
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}
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};
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static void nu_pdma_i2s_rx_cb(void *pvUserData, uint32_t u32EventFilter)
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{
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nu_i2s_t psNuI2s = (nu_i2s_t)pvUserData;
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nu_i2s_dai_t psNuI2sDai;
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RT_ASSERT(psNuI2s != RT_NULL);
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psNuI2sDai = &psNuI2s->i2s_dais[NU_I2S_DAI_CAPTURE];
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if (u32EventFilter & NU_PDMA_EVENT_TRANSFER_DONE)
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{
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// Report a buffer ready.
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rt_uint8_t *pbuf_old = &psNuI2sDai->fifo[psNuI2sDai->fifo_block_idx * NU_I2S_DMA_BUF_BLOCK_SIZE] ;
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psNuI2sDai->fifo_block_idx = (psNuI2sDai->fifo_block_idx + 1) % NU_I2S_DMA_BUF_BLOCK_NUMBER;
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/* Report upper layer. */
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rt_audio_rx_done(&psNuI2s->audio, pbuf_old, NU_I2S_DMA_BUF_BLOCK_SIZE);
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}
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}
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static void nu_pdma_i2s_tx_cb(void *pvUserData, uint32_t u32EventFilter)
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{
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nu_i2s_t psNuI2s = (nu_i2s_t)pvUserData;
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nu_i2s_dai_t psNuI2sDai;
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RT_ASSERT(psNuI2s != RT_NULL);
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psNuI2sDai = &psNuI2s->i2s_dais[NU_I2S_DAI_PLAYBACK];
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if (u32EventFilter & NU_PDMA_EVENT_TRANSFER_DONE)
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{
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rt_audio_tx_complete(&psNuI2s->audio);
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psNuI2sDai->fifo_block_idx = (psNuI2sDai->fifo_block_idx + 1) % NU_I2S_DMA_BUF_BLOCK_NUMBER;
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}
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}
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static rt_err_t nu_i2s_pdma_sc_config(nu_i2s_t psNuI2s, E_NU_I2S_DAI dai)
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{
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rt_err_t result = RT_EOK;
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I2S_T *i2s_base;
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nu_i2s_dai_t psNuI2sDai;
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int i;
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uint32_t u32Src, u32Dst;
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nu_pdma_cb_handler_t pfm_pdma_cb;
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RT_ASSERT(psNuI2s != RT_NULL);
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/* Get base address of i2s register */
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i2s_base = psNuI2s->i2s_base;
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psNuI2sDai = &psNuI2s->i2s_dais[dai];
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switch ((int)dai)
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{
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case NU_I2S_DAI_PLAYBACK:
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pfm_pdma_cb = nu_pdma_i2s_tx_cb;
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u32Src = (uint32_t)&psNuI2sDai->fifo[0];
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u32Dst = (uint32_t)&i2s_base->TXFIFO;
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break;
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case NU_I2S_DAI_CAPTURE:
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pfm_pdma_cb = nu_pdma_i2s_rx_cb;
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u32Src = (uint32_t)&i2s_base->RXFIFO;
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u32Dst = (uint32_t)&psNuI2sDai->fifo[0];
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break;
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default:
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return -RT_EINVAL;
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}
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result = nu_pdma_callback_register(psNuI2sDai->pdma_chanid,
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pfm_pdma_cb,
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(void *)psNuI2s,
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NU_PDMA_EVENT_TRANSFER_DONE);
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RT_ASSERT(result == RT_EOK);
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for (i = 0; i < NU_I2S_DMA_BUF_BLOCK_NUMBER; i++)
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{
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/* Setup dma descriptor entry */
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result = nu_pdma_desc_setup(psNuI2sDai->pdma_chanid, // Channel ID
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psNuI2sDai->pdma_descs[i], // this descriptor
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32, // 32-bits
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(dai == NU_I2S_DAI_PLAYBACK) ? u32Src + (i * NU_I2S_DMA_BUF_BLOCK_SIZE) : u32Src, //Memory or RXFIFO
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(dai == NU_I2S_DAI_PLAYBACK) ? u32Dst : u32Dst + (i * NU_I2S_DMA_BUF_BLOCK_SIZE), //TXFIFO or Memory
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(int32_t)NU_I2S_DMA_BUF_BLOCK_SIZE / 4, // Transfer count
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psNuI2sDai->pdma_descs[(i + 1) % NU_I2S_DMA_BUF_BLOCK_NUMBER]); // Next descriptor
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RT_ASSERT(result == RT_EOK);
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}
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/* Assign head descriptor */
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result = nu_pdma_sg_transfer(psNuI2sDai->pdma_chanid, psNuI2sDai->pdma_descs[0], 0);
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RT_ASSERT(result == RT_EOK);
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return result;
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}
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static rt_bool_t nu_i2s_capacity_check(struct rt_audio_configure *pconfig)
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{
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switch (pconfig->samplebits)
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{
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case 8:
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case 16:
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/* case 24: PDMA constrain */
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case 32:
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break;
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default:
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goto exit_nu_i2s_capacity_check;
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}
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switch (pconfig->channels)
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{
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case 1:
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case 2:
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break;
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default:
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goto exit_nu_i2s_capacity_check;
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}
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return RT_TRUE;
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exit_nu_i2s_capacity_check:
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return RT_FALSE;
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}
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static rt_err_t nu_i2s_dai_setup(nu_i2s_t psNuI2s, struct rt_audio_configure *pconfig)
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{
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rt_err_t result = RT_EOK;
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nu_acodec_ops_t pNuACodecOps = RT_NULL;
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RT_ASSERT(psNuI2s->AcodecOps != RT_NULL);
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pNuACodecOps = psNuI2s->AcodecOps;
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rt_uint32_t real_samplerate;
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/* Open I2S */
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if (nu_i2s_capacity_check(pconfig) == RT_TRUE)
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{
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/* Reset audio codec */
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if (pNuACodecOps->nu_acodec_reset)
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result = pNuACodecOps->nu_acodec_reset();
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if (result != RT_EOK)
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goto exit_nu_i2s_dai_setup;
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/* Setup audio codec */
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if (pNuACodecOps->nu_acodec_init)
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result = pNuACodecOps->nu_acodec_init();
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if (!pNuACodecOps->nu_acodec_init || result != RT_EOK)
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goto exit_nu_i2s_dai_setup;
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/* Setup acodec samplerate/samplebit/channel */
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if (pNuACodecOps->nu_acodec_dsp_control)
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result = pNuACodecOps->nu_acodec_dsp_control(pconfig);
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if (!pNuACodecOps->nu_acodec_dsp_control || result != RT_EOK)
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goto exit_nu_i2s_dai_setup;
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real_samplerate = I2S_Open(psNuI2s->i2s_base,
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(psNuI2s->AcodecOps->role == NU_ACODEC_ROLE_MASTER) ? I2S_MODE_SLAVE : I2S_MODE_MASTER,
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pconfig->samplerate,
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(((pconfig->samplebits / 8) - 1) << I2S_CTL0_DATWIDTH_Pos),
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(pconfig->channels == 1) ? I2S_ENABLE_MONO : I2S_DISABLE_MONO,
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I2S_FORMAT_I2S);
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LOG_I("Open I2S.");
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/* Open I2S0 interface and set to slave mode, stereo channel, I2S format */
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if (pconfig->samplerate != real_samplerate)
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{
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LOG_W("Real sample rate: %d Hz != preferred sample rate: %d Hz\n", real_samplerate, pconfig->samplerate);
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}
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/* Set MCLK and enable MCLK */
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I2S_EnableMCLK(psNuI2s->i2s_base, __HXT);
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/* Set unmute */
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if (pNuACodecOps->nu_acodec_mixer_control)
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pNuACodecOps->nu_acodec_mixer_control(AUDIO_MIXER_MUTE, RT_FALSE);
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}
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else
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result = -RT_EINVAL;
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exit_nu_i2s_dai_setup:
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return result;
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}
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static rt_err_t nu_i2s_getcaps(struct rt_audio_device *audio, struct rt_audio_caps *caps)
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{
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rt_err_t result = RT_EOK;
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nu_i2s_t psNuI2s;
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nu_acodec_ops_t pNuACodecOps = RT_NULL;
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RT_ASSERT(audio != RT_NULL);
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RT_ASSERT(caps != RT_NULL);
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psNuI2s = (nu_i2s_t)audio;
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RT_ASSERT(psNuI2s->AcodecOps != RT_NULL);
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pNuACodecOps = psNuI2s->AcodecOps;
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switch (caps->main_type)
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{
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case AUDIO_TYPE_QUERY:
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switch (caps->sub_type)
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{
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case AUDIO_TYPE_QUERY:
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caps->udata.mask = AUDIO_TYPE_INPUT | AUDIO_TYPE_OUTPUT | AUDIO_TYPE_MIXER;
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break;
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default:
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result = -RT_ERROR;
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break;
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} // switch (caps->sub_type)
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break;
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case AUDIO_TYPE_MIXER:
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if (pNuACodecOps->nu_acodec_mixer_query)
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{
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switch (caps->sub_type)
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{
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case AUDIO_MIXER_QUERY:
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return pNuACodecOps->nu_acodec_mixer_query(AUDIO_MIXER_QUERY, &caps->udata.mask);
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default:
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return pNuACodecOps->nu_acodec_mixer_query(caps->sub_type, (rt_uint32_t *)&caps->udata.value);
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} // switch (caps->sub_type)
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} // if (pNuACodecOps->nu_acodec_mixer_query)
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result = -RT_ERROR;
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break;
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case AUDIO_TYPE_INPUT:
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case AUDIO_TYPE_OUTPUT:
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switch (caps->sub_type)
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{
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case AUDIO_DSP_PARAM:
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caps->udata.config.channels = psNuI2s->config.channels;
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caps->udata.config.samplebits = psNuI2s->config.samplebits;
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caps->udata.config.samplerate = psNuI2s->config.samplerate;
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break;
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case AUDIO_DSP_SAMPLERATE:
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caps->udata.config.samplerate = psNuI2s->config.samplerate;
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break;
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case AUDIO_DSP_CHANNELS:
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caps->udata.config.channels = psNuI2s->config.channels;
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break;
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case AUDIO_DSP_SAMPLEBITS:
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caps->udata.config.samplebits = psNuI2s->config.samplebits;
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break;
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default:
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result = -RT_ERROR;
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break;
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} // switch (caps->sub_type)
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break;
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default:
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result = -RT_ERROR;
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break;
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} // switch (caps->main_type)
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return result;
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}
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static rt_err_t nu_i2s_configure(struct rt_audio_device *audio, struct rt_audio_caps *caps)
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{
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rt_err_t result = RT_EOK;
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nu_i2s_t psNuI2s;
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nu_acodec_ops_t pNuACodecOps = RT_NULL;
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int stream = -1;
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RT_ASSERT(audio != RT_NULL);
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RT_ASSERT(caps != RT_NULL);
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psNuI2s = (nu_i2s_t)audio;
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RT_ASSERT(psNuI2s->AcodecOps != RT_NULL);
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pNuACodecOps = psNuI2s->AcodecOps;
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switch (caps->main_type)
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{
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case AUDIO_TYPE_MIXER:
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if (psNuI2s->AcodecOps->nu_acodec_mixer_control)
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psNuI2s->AcodecOps->nu_acodec_mixer_control(caps->sub_type, caps->udata.value);
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break;
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|
||
|
|
case AUDIO_TYPE_INPUT:
|
||
|
|
stream = AUDIO_STREAM_RECORD;
|
||
|
|
case AUDIO_TYPE_OUTPUT:
|
||
|
|
{
|
||
|
|
rt_bool_t bNeedReset = RT_FALSE;
|
||
|
|
|
||
|
|
if (stream < 0)
|
||
|
|
stream = AUDIO_STREAM_REPLAY;
|
||
|
|
|
||
|
|
switch (caps->sub_type)
|
||
|
|
{
|
||
|
|
case AUDIO_DSP_PARAM:
|
||
|
|
if (rt_memcmp(&psNuI2s->config, &caps->udata.config, sizeof(struct rt_audio_configure)) != 0)
|
||
|
|
{
|
||
|
|
rt_memcpy(&psNuI2s->config, &caps->udata.config, sizeof(struct rt_audio_configure));
|
||
|
|
bNeedReset = RT_TRUE;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case AUDIO_DSP_SAMPLEBITS:
|
||
|
|
if (psNuI2s->config.samplerate != caps->udata.config.samplebits)
|
||
|
|
{
|
||
|
|
psNuI2s->config.samplerate = caps->udata.config.samplebits;
|
||
|
|
bNeedReset = RT_TRUE;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case AUDIO_DSP_CHANNELS:
|
||
|
|
if (psNuI2s->config.channels != caps->udata.config.channels)
|
||
|
|
{
|
||
|
|
pNuACodecOps->config.channels = caps->udata.config.channels;
|
||
|
|
bNeedReset = RT_TRUE;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case AUDIO_DSP_SAMPLERATE:
|
||
|
|
if (psNuI2s->config.samplerate != caps->udata.config.samplerate)
|
||
|
|
{
|
||
|
|
psNuI2s->config.samplerate = caps->udata.config.samplerate;
|
||
|
|
bNeedReset = RT_TRUE;
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
result = -RT_ERROR;
|
||
|
|
break;
|
||
|
|
} // switch (caps->sub_type)
|
||
|
|
|
||
|
|
if (bNeedReset)
|
||
|
|
{
|
||
|
|
return nu_i2s_start(audio, stream);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
result = -RT_ERROR;
|
||
|
|
break;
|
||
|
|
} // switch (caps->main_type)
|
||
|
|
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
static rt_err_t nu_i2s_init(struct rt_audio_device *audio)
|
||
|
|
{
|
||
|
|
rt_err_t result = RT_EOK;
|
||
|
|
nu_i2s_t psNuI2s;
|
||
|
|
|
||
|
|
RT_ASSERT(audio != RT_NULL);
|
||
|
|
|
||
|
|
psNuI2s = (nu_i2s_t)audio;
|
||
|
|
|
||
|
|
/* Reset this module */
|
||
|
|
SYS_ResetModule(psNuI2s->i2s_rst);
|
||
|
|
|
||
|
|
return -(result);
|
||
|
|
}
|
||
|
|
|
||
|
|
static rt_err_t nu_i2s_start(struct rt_audio_device *audio, int stream)
|
||
|
|
{
|
||
|
|
nu_i2s_t psNuI2s;
|
||
|
|
|
||
|
|
RT_ASSERT(audio != RT_NULL);
|
||
|
|
|
||
|
|
psNuI2s = (nu_i2s_t)audio;
|
||
|
|
|
||
|
|
/* Restart all: I2S and codec. */
|
||
|
|
nu_i2s_stop(audio, stream);
|
||
|
|
if (nu_i2s_dai_setup(psNuI2s, &psNuI2s->config) != RT_EOK)
|
||
|
|
return -RT_ERROR;
|
||
|
|
|
||
|
|
switch (stream)
|
||
|
|
{
|
||
|
|
case AUDIO_STREAM_REPLAY:
|
||
|
|
{
|
||
|
|
nu_i2s_pdma_sc_config(psNuI2s, NU_I2S_DAI_PLAYBACK);
|
||
|
|
|
||
|
|
/* Start TX DMA */
|
||
|
|
I2S_ENABLE_TXDMA(psNuI2s->i2s_base);
|
||
|
|
|
||
|
|
/* Enable I2S Tx function */
|
||
|
|
I2S_ENABLE_TX(psNuI2s->i2s_base);
|
||
|
|
|
||
|
|
LOG_I("Start replay.");
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
case AUDIO_STREAM_RECORD:
|
||
|
|
{
|
||
|
|
nu_i2s_pdma_sc_config(psNuI2s, NU_I2S_DAI_CAPTURE);
|
||
|
|
|
||
|
|
/* Start RX DMA */
|
||
|
|
I2S_ENABLE_RXDMA(psNuI2s->i2s_base);
|
||
|
|
|
||
|
|
/* Enable I2S Rx function */
|
||
|
|
I2S_ENABLE_RX(psNuI2s->i2s_base);
|
||
|
|
|
||
|
|
LOG_I("Start record.");
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
default:
|
||
|
|
return -RT_ERROR;
|
||
|
|
}
|
||
|
|
|
||
|
|
return RT_EOK;
|
||
|
|
}
|
||
|
|
|
||
|
|
static rt_err_t nu_i2s_stop(struct rt_audio_device *audio, int stream)
|
||
|
|
{
|
||
|
|
nu_i2s_t psNuI2s;
|
||
|
|
nu_i2s_dai_t psNuI2sDai = RT_NULL;
|
||
|
|
|
||
|
|
RT_ASSERT(audio != RT_NULL);
|
||
|
|
|
||
|
|
psNuI2s = (nu_i2s_t)audio;
|
||
|
|
|
||
|
|
switch (stream)
|
||
|
|
{
|
||
|
|
case AUDIO_STREAM_REPLAY:
|
||
|
|
psNuI2sDai = &psNuI2s->i2s_dais[NU_I2S_DAI_PLAYBACK];
|
||
|
|
|
||
|
|
// Disable TX
|
||
|
|
I2S_DISABLE_TXDMA(psNuI2s->i2s_base);
|
||
|
|
I2S_DISABLE_TX(psNuI2s->i2s_base);
|
||
|
|
|
||
|
|
LOG_I("Stop replay.");
|
||
|
|
break;
|
||
|
|
|
||
|
|
case AUDIO_STREAM_RECORD:
|
||
|
|
psNuI2sDai = &psNuI2s->i2s_dais[NU_I2S_DAI_CAPTURE];
|
||
|
|
|
||
|
|
// Disable RX
|
||
|
|
I2S_DISABLE_RXDMA(psNuI2s->i2s_base);
|
||
|
|
I2S_DISABLE_RX(psNuI2s->i2s_base);
|
||
|
|
|
||
|
|
LOG_I("Stop record.");
|
||
|
|
break;
|
||
|
|
|
||
|
|
default:
|
||
|
|
return -RT_EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Stop DMA transfer. */
|
||
|
|
nu_pdma_channel_terminate(psNuI2sDai->pdma_chanid);
|
||
|
|
|
||
|
|
/* Close I2S */
|
||
|
|
if (!(psNuI2s->i2s_base->CTL0 & (I2S_CTL0_TXEN_Msk | I2S_CTL0_RXEN_Msk)))
|
||
|
|
{
|
||
|
|
I2S_DisableMCLK(psNuI2s->i2s_base);
|
||
|
|
I2S_Close(psNuI2s->i2s_base);
|
||
|
|
LOG_I("Close I2S.");
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Silence */
|
||
|
|
rt_memset((void *)psNuI2sDai->fifo, 0, NU_I2S_DMA_FIFO_SIZE);
|
||
|
|
psNuI2sDai->fifo_block_idx = 0;
|
||
|
|
|
||
|
|
return RT_EOK;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void nu_i2s_buffer_info(struct rt_audio_device *audio, struct rt_audio_buf_info *info)
|
||
|
|
{
|
||
|
|
nu_i2s_t psNuI2s;
|
||
|
|
|
||
|
|
RT_ASSERT(audio != RT_NULL);
|
||
|
|
RT_ASSERT(info != RT_NULL);
|
||
|
|
|
||
|
|
psNuI2s = (nu_i2s_t)audio;
|
||
|
|
|
||
|
|
info->buffer = (rt_uint8_t *)psNuI2s->i2s_dais[NU_I2S_DAI_PLAYBACK].fifo ;
|
||
|
|
info->total_size = NU_I2S_DMA_FIFO_SIZE;
|
||
|
|
info->block_size = NU_I2S_DMA_BUF_BLOCK_SIZE;
|
||
|
|
info->block_count = NU_I2S_DMA_BUF_BLOCK_NUMBER;
|
||
|
|
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
static struct rt_audio_ops nu_i2s_audio_ops =
|
||
|
|
{
|
||
|
|
.getcaps = nu_i2s_getcaps,
|
||
|
|
.configure = nu_i2s_configure,
|
||
|
|
|
||
|
|
.init = nu_i2s_init,
|
||
|
|
.start = nu_i2s_start,
|
||
|
|
.stop = nu_i2s_stop,
|
||
|
|
.transmit = RT_NULL,
|
||
|
|
.buffer_info = nu_i2s_buffer_info
|
||
|
|
};
|
||
|
|
|
||
|
|
static rt_err_t nu_hw_i2s_pdma_allocate(nu_i2s_dai_t psNuI2sDai)
|
||
|
|
{
|
||
|
|
/* Allocate I2S nu_dma channel */
|
||
|
|
if ((psNuI2sDai->pdma_chanid = nu_pdma_channel_allocate(psNuI2sDai->pdma_perp)) < 0)
|
||
|
|
{
|
||
|
|
goto nu_hw_i2s_pdma_allocate;
|
||
|
|
}
|
||
|
|
|
||
|
|
return RT_EOK;
|
||
|
|
|
||
|
|
nu_hw_i2s_pdma_allocate:
|
||
|
|
|
||
|
|
return -(RT_ERROR);
|
||
|
|
}
|
||
|
|
|
||
|
|
int rt_hw_i2s_init(void)
|
||
|
|
{
|
||
|
|
int i = 0;
|
||
|
|
nu_i2s_dai_t psNuI2sDai;
|
||
|
|
|
||
|
|
for (i = 0; i < NU_I2S_DAI_CNT; i++)
|
||
|
|
{
|
||
|
|
uint8_t *pu8ptr = rt_malloc(NU_I2S_DMA_FIFO_SIZE);
|
||
|
|
psNuI2sDai = &g_nu_i2s_dev.i2s_dais[i];
|
||
|
|
psNuI2sDai->fifo = pu8ptr;
|
||
|
|
rt_memset(pu8ptr, 0, NU_I2S_DMA_FIFO_SIZE);
|
||
|
|
RT_ASSERT(psNuI2sDai->fifo != RT_NULL);
|
||
|
|
|
||
|
|
psNuI2sDai->pdma_chanid = -1;
|
||
|
|
psNuI2sDai->fifo_block_idx = 0;
|
||
|
|
RT_ASSERT(nu_hw_i2s_pdma_allocate(psNuI2sDai) == RT_EOK);
|
||
|
|
|
||
|
|
RT_ASSERT(nu_pdma_sgtbls_allocate(&psNuI2sDai->pdma_descs[0], NU_I2S_DMA_BUF_BLOCK_NUMBER) == RT_EOK);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Register ops of audio device */
|
||
|
|
g_nu_i2s_dev.audio.ops = &nu_i2s_audio_ops;
|
||
|
|
|
||
|
|
/* Register device, RW: it is with replay and record functions. */
|
||
|
|
rt_audio_register(&g_nu_i2s_dev.audio, g_nu_i2s_dev.name, RT_DEVICE_FLAG_RDWR, &g_nu_i2s_dev);
|
||
|
|
|
||
|
|
return RT_EOK;
|
||
|
|
}
|
||
|
|
INIT_DEVICE_EXPORT(rt_hw_i2s_init);
|
||
|
|
#endif //#if defined(BSP_USING_I2S)
|