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6747初始化遇到的问题



初始化时程序停在PSC0_lPSC_enable(0, 6)的while( (*(unsigned int*)(PSC0_MDSTAT+4 * LPSC_num) & 0x1F) !=0x3);,查看6747手册,PSC0 6~8是unused,去掉程序可以运行,但DSP工作不正常,请问PSC0_lPSC_enable(0, 6)的作用是什么?