﻿/**
  ******************************************************************************
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  * Copyright (C) Shanghai Eastsoft Microelectronics Co., Ltd. ALL rights reserved.
  *******************************************************************************
  */

<--------------------------------------------------------------------------------
Version history:
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2021-12-31	V1.0.0	AE TEAM


<--------------------------------------------------------------------------------
Demo introduction:
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I2S 播放/录音

PZ-WM8978
SPI0 I2S0
SDA (放音)  --- PB5   I2S_SD   SPI0_MOSI PB5   4
SDB (录音)  --- PB5   I2S_SD   SPI0_MOSI
SCKA        --- PD3   I2S_CK   SPI0_SCK  PB3   4
MCLKA       --- PB4   I2S_MCLK SPI0_MISO PB4   4
FSA         --- PA4   I2S_WS   SPI0_NSS  PA15  4
I2C-----
PB6 -  I2C0_SCL
PB7 -  I2C0_SDA

音频播放/录音demo
命令：
play   播放音乐
play 0:/MUSIC/xxx.wav 播放xxx.wav
stop   停止
pause  暂停
resume 继续
record 录音 
record 0:/MUSIC/yyy.wav 录音，并保存到yyy文件中
replay 播放录音
volh   调高音量
voll   调低音量
info/status 查看当前状态
music 列出0:/MUSIC 文件夹下的wav文件

注1：只能在stop状态下使用需要控制WM8978的命令如play/record/replay/volh/voll
注2：音频数据以数组形式存放在sample_wav.c文件中
注3：测试时使用的是单通道，16000采样率,16bits的音频
注4：MUSIC文件夹存放一个用于测试的wav文件
注5：如果能够听到一小段音乐但无法持续播放，请检查ald_dma.c文件
将以下代码
			if (dma0_cbk[i].cplt_cbk != NULL)
				dma0_cbk[i].cplt_cbk(dma0_cbk[i].cplt_arg);

			DMA0->ICFR    = (1U << i);
			DMA0->CHENCLR = (1U << i);
改为
			DMA0->ICFR    = (1U << i);
			DMA0->CHENCLR = (1U << i);

			if (dma0_cbk[i].cplt_cbk != NULL)
				dma0_cbk[i].cplt_cbk(dma0_cbk[i].cplt_arg);

<--------------------------------------------------------------------------------
System clock:
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External HOSC[12MHz] divided by 3, then PLL to 48MHz.

<--------------------------------------------------------------------------------
Pin connection: 
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I2C0_SCL   ---- (PB6, GPIO_FUNC_5)
I2C0_SDA   ---- (PB7, GPIO_FUNC_5)
I2S0_LRCK  ---- (PA4, GPIO_FUNC_6)
I2S0_SCLK  ---- (PB3, GPIO_FUNC_4)
I2S0_SD    ---- (PB5, GPIO_FUNC_4)
I2S0_MCLK  ---- (PB4, GPIO_FUNC_4)
SPI1_NSS   ---- (PC0, GPIO_FUNC_1)
SPI1_SCK   ---- (PC1, GPIO_FUNC_4)
SPI1_MISO  ---- (PC2, GPIO_FUNC_4)
SPI1_MOSI  ---- (PC3, GPIO_FUNC_4)
