SPI时钟使能-->SPI模块时钟源设置-->IO复用设置为SPI接口-->SPI模块参数配置-->使用
/* Enable SPI0 peripheral clock */
CLK_EnableModuleClock(SPI0_MODULE);
/* Select PCLK0 as the clock source of SPI0 */
CLK_SetModuleClock(SPI0_MODULE, CLK_CLKSEL2_SPI0SEL_PCLK1, MODULE_NoMsk);
/* Setup SPI0 multi-function pins */
SYS->GPA_MFPL |= SYS_GPA_MFPL_PA0MFP_SPI0_MOSI | SYS_GPA_MFPL_PA1MFP_SPI0_MISO | SYS_GPA_MFPL_PA2MFP_SPI0_CLK | SYS_GPA_MFPL_PA3MFP_SPI0_SS;
SPI_Open(SPI_FLASH_PORT, SPI_MASTER, SPI_MODE_0, 8, 20000000);
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