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launchpad 28337S ADC采样不准

Other Parts Discussed in Thread: C2000WARE, CONTROLSUITE

下载c2000ware_3_01_00_00/drvierlib/2837xS/examples里面的ADC例程进芯片,12bit采样。1.5V以上,采样出来的值都是3895定值,直到3V以上变成4095。

把controlSUITE/developments_kits\LAUNCHXL_28377S/LaunchPadDemo下载进板子,也有同样的问题。

芯片型号:TMS320F28377SPZPT YFC-65C1DYW

请问这是配置的哪里有问题?还是板子本身坏了?实际电压是用示波器量ADC管脚对板子的GND。