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DAC7714四通道，用dsp的spi控制，245电平转换，对四通道均进行驱动，总是在程序的最后一个通道才可以驱动，程序的前三个通道无法获得正确的电压
注意选择通道时LOADDACS 低时，相应的DAC寄存器才会改变
谢谢，问题已解决，和程序无关，用的开发板问题
