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CC3220SF: 作为SPI从机接收时,最长可以接收多少字节的数据?

https://dev.ti.com/tirex/content/simplelink_cc32xx_sdk_6_10_00_05/docs/drivers/doxygen/html/_s_p_i_c_c32_x_x_d_m_a_8h.html

关于文档中的那个例子,我有几个问题想请教一下。

第一个是,这一段程序实际上是希望传输多少字节的数据,是2000字节还是多少呢?

第二个问题是,三个txBuff和两个rxBuff的关系是怎么样子的,是txBuff1\2\3各自指向一片独立的内存还是,txBuff1是一段内存的开头,txbuff2也是这段内存开头和txbuff3是这段内存的中间?