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按照DAC8831开发板设计了PCB，生成正弦波，单极性输出，直接测得DAC8831的输出引脚，结果输出波形如图所示，这个是什么问题
从波形看，数据的最高位出了问题， 检查实际通信时序里的时间关系，特别是数据的首位。
输入的码型对吗？偏移二进制或者二进制补码
一开始直接用SPI就是这个现象，后来猜想是时序问题，就用IO口模拟，代码如下
SET_LDAC(); delay(10); // SPI start SET_SYNC(); delay(10); CLR_SYNC(); //bring CS low delay(1);
//Write out the ControlWord for(i=0; i<16; i++) { SET_SCLK(); delay(5); if(0x8000 == (ValueToWrite & 0x8000)) { SET_SDIN(); //Send one to SDI pin } else { CLR_SDIN(); //Send zero to SDI pin }
delay(5); CLR_SCLK(); delay(5);
ValueToWrite <<= 1; //Rotate data delay(50); }
// SPI ends SET_SYNC(); delay(1); CLR_LDAC(); delay(1); SET_LDAC(); delay(1);
