为什么DSP 28335 的GPIO0和GPIO1在进入debug而未烧录程序之前电平是1.92V,难道不因该是3.3V吗?
Green Deng:你好
正常情况下,上电复位之后,GPIO0~11是没有被上拉的。你可以参考芯片datasheet第21页内容:
All GPIO pins are I/O/Z and have an internal pullup, which can be selectively enabled or disabled on a per-pin basis. This feature only applies to the GPIO pins. The pullups on GPIO0–GPIO11 pins are not enabled at reset. The pullups on GPIO12–GPIO87 are enabled upon reset.