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https://e2e.ti.com/support/data-converters-group/data-converters/f/data-converters-forum/711645/faq-afe5809evm-how-to-choose-the-option-to-select-the-analog-adc-inputs-for-afe5809gui-afe5812gui-as-opposed-to-test-patterns
测试模式“none”表示模拟信号输入，而不是斜坡、正弦等模式。
