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如果将引脚复用为PRU GPI/GPO功能，能直接在DSP核中通过控制寄存器控制PRU GPI/GPO引脚的电平吗？读取也一样吗？
也不能说完全不可以，要看你怎么用，见下面链接的说明 PRU Internal General Purpose Register n (0x0400 + 4*n)：
