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我现在想实现28335的8路DAC输出，用的是外设的TLV5620 DAC芯片，通信协议是SPI。但是TLV5620是4通道输出芯片，同时F28335只有一路SPI-A，只能控制一片TLV5620，无法实现8路输出。请问该怎么解决？
1. 28335的McBSP支持SPI模式；
2. 换DAC芯片：https://www.ti.com.cn/zh-cn/data-converters/dac-circuit/precision/products.html#1345=8%3B8&-1=TLV%3Bfalse&
我现在已经将McBSP配置为SPI模式，那么该如何写相应的DAC程序，因为这和SPI完全不同
TI training: https://dev.ti.com/tirex/content/c2000_academy_2_03_00_43_all/modules/c2000_communications/c2000_i2c_spi_mcbsp.html#multichannel-buffered-serial-port-mcbsp-
sprui07_TMS320x2833x, TMS320x2823x Technical Reference Manual Chapter 12 Multichannel Buffered Serial Port (McBSP)
C:\ti\c2000\C2000Ware_4_03_00_00\device_support\f2833x\examples\mcbsp_spi_loopback
