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ADS1191采集遇到的奇怪问题

我采集内部测试信TEST1Hz方波,有时候hen正常 有时候不正常,不知道是哪里出现问题


很明显第一幅图是比较正常的 第二幅会出现问题。有没有大神知道这个问题是什么原因

这是我的寄存器配置:

SPI_Write(0x41);
SPI_Write(0x00);
SPI_Write(0x01);//config1

SPI_Write(0x42);
SPI_Write(0x00);
SPI_Write(0xA3);//config2

SPI_Write(0x44);
SPI_Write(0x00);
SPI_Write(0x05);//ch1set

SPI_Write(0x45);
SPI_Write(0x00);
SPI_Write(0x80);//ch2set