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DSP端外设控制问题



OMAP-138  自己做的板子,DSP端片上RAM可写,通过CCS观察正确,但是DSP外设不能读写,如DDR不能写,CCS读出全为0,  GP0驱动LED等,哪位知道原因可能是什么? GP0[1] 、GP0[2] 、GP0[3] 、GP0[4]也不能输出高低电平 ,请问原因可能是什么?]