spi的DMA传输,是一种很重要的传输方式，但他简单易学，具有很高的参考价值-DMA transfer of the spi is a very important means of transmission, easy to learn but he has a very high reference valuetrassmision

STM32F4xx_StdPeriph_Driver是用于ST公司的ARM-Cortex M4系列单片机编程的底层驱动库，包含了基本的GPIO, ADC, SPI, USART, DMA, DAC等外设的配置函数。-STM32F4xx StdPeriph Driver is used for ST s ARM- the Cortex M4 series microcontroller programming the underlying Driver library, contains the