1、功能说明

    1、I2S 通过 DMA 收发数据

2、使用环境

    /* 硬件环境：工程对应的开发硬件平台 */
    开发板：N32G4XM-STB V1.1

3、使用说明
    
    /* 描述相关模块配置方法；例如:时钟，I/O等 */
    1、SystemClock：144MHz
    2、GPIO：I2S2（SLAVE    SPI2 WS--PB12、SCK--PB13、SD--PB15），
                    I2S3（MASTER SPI3 WS--PA15、SCK--PB3、 SD--PB5）,
    3、DMA：I2S2 接收采用 DMA1_CH4 通道，I2S3 发送采用 DMA2_CH2 通道；

    /* 描述Demo的测试步骤和现象 */
    1.编译后下载程序复位运行；
    2.I2S3 通过 DMA2_CH2 发送数据，I2S2 通过 DMA1_CH4 接收数据 ，运行完成后，查看 TransferStatus 状态为 PASSED

4、注意事项
    无


1. Function description

     1. I2S sends and receives data through DMA

2. Use environment

     /* Hardware environment: the development hardware platform corresponding to the project */
     Development board: N32G4XM-STB V1.1

3. Instructions for use
    
     /* Describe related module configuration methods; for example: clock, I/O, etc. */
     1. SystemClock: 144MHz
     2. GPIO: I2S2 (SLAVE SPI2 WS--PB12, SCK--PB13, SD--PB14),
                  I2S3 (MASTER SPI3 WS--PA15, SCK--PB3, SD--PB5),
     3. DMA: DMA1_CH4 channel is used for I2S2 reception, and DMA2_CH2 channel is used for I2S3 transmission;

     /* Describe the test steps and phenomena of the Demo */
     1. After compiling, download the program to reset and run;
     2. I2S3 sends data through DMA2_CH2, and I2S2 receives data through DMA1_CH4. After the operation is completed, check that the TransferStatus status is PASSED

4. Matters needing attention
     none