DSP2812处理器硬件SPI控制函数，包含发送接收、中断等，可自行设置波特率。-DSP2812 processor hardware SPI control functions, including to send and receive, interrupt, etc., are free to set the baud rate.

实现MCBSP-SPI 的同步环路接受与发送，自发自收测试，已经测试过(MCBSP-SPI TEST DSP2812)