不退出while循环：枚举比较

Question

我正在尝试学习微控制器的SPI外围设备。

这是从代码的一部分

volatile uint8_t rx_data[COUNT];

volatile uint8_t counter = 0;

volatile uint8_t data;

typedef enum
{
    SPI_STATE_READY      = 1,  /*  SPI initialized and ready for use                  */
    SPI_STATE_BUSY       = 2,  /*  SPI process is ongoing                             */                             
}spi_state_t;

typedef struct 
{
    spi_state_t spi_state;
}spi_handle;

spi_handle Spi;

int main(void)
{
    initUSART();
    printString("Slave\r\n");
    DDRC = 0XFF;
    spi_init_slave();                             //Initialize slave SPI

    Spi.spi_state = SPI_STATE_READY;
    printString("OK\r\n");
    //sei();
    while(1)
    {
        while(Spi.spi_state != SPI_STATE_READY)
        {
             printString("NOT OKAY\r\n");
        }
        rx_slave(&Spi);
        _delay_ms(50);
        printString(rx_data);
        _delay_ms(100);
    }
}

但是代码在while循环中触发。它在串行终端中连续打印 NOOK OK