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你好，请问使用28035的串口下载程序GPIO28,29,7,12使用哪两个？
GPIO28/29，请参考数据手册Table 3-7. Peripheral Bootload Pins.
The SCI-A loader uses following pins:
SCIRXDA on GPIO28
SCITXDA on GPIO29
可以使用C2PROG软件，USB-SCI方式是不开源但是免费使用的。
