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DSP28335的SPI与DAC8564通讯问题

各位工程师,你们好。我目前想使用的外设是DAC8564,该芯片的数据格式为24 bit。DSP28335的SPI功能数据长度只能为8 bit或 16 bit, 想请教下如何使用DSP的SPI功能驱动DAC8564.