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     1I2S ģʽԺл SPI ģʽݣл I2S ģʽ
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     KEIL MDK-ARM 5.30.0.0
     Ӳ      N32G031CL-STB V1.0
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        1SystemClock48MHz
        2GPIOģʽ DEMO 壩I2S1: WS--PA4CK--PA5SD--PA7
                 ģʽ DEMO 壩I2S1: WS--PA4CK--PA5SD--PA7
     ʹ÷
        1سλУ
        2ģʽ DEMO ģʽȰסģʽ DEMO 帴λȻģʽ DEMO ȫܣ
             ɿģʽ DEMO 帴λ
4ע
     Ҫ demo ϣһ¼ģʽһ¼ģʽӵ VCC  GND

1. Function description
    1. After I2S master mode sends data, switch to SPI master mode to send data, and then switch to I2S slave mode to send data
2. Use environment
    Software development environment: KEIL MDK-ARM 5.30.0.0
    Hardware Environment: Developed based on N32G031CL-STB V1.0
3. Instructions for use
    System Configuration;
        1. SystemClock48MHz
        2. GPIO(Master mode DEMO board) I2S1: WS--PA4, CK--PA5, SD--PA7
                 (Slave mode DEMO board)  I2S1: WS--PA4, CK--PA5, SD--PA7
    Instructions:
        1. After compiling, download the program to reset and run;
        2. The slave mode DEMO board enters the debug mode, first press and hold the master mode DEMO board reset button, 
		then the slave mode DEMO board runs at full speed,then release the reset button of the master mode DEMO board.
4. Matters needing attention
    Two demo boards are required, one board to burn the master mode program, one board to burn the slave mode program, connect the VCC and GND of the two boards