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大侠们好：我用S3C2410，<br /> ChangeClockDivider(1,1); // HCLK=FCLK/2,PCLK=FCLK/4 <br /> ChangeMPllValue(0xa1,0x3,0x1); // FCK=202.8MHZ<br /> 然后在主程序中 <br /> for(;;)<br /> { <br /> rGPEDAT = 0xffffc7ff; //LED1,LED2,LED3=ON <br /> rGPEDAT = 0xffffffff; //LED1,LED2,LED3=OFF <br /> rGPEDAT = 0xffffc7ff; <br /> rGPEDAT = 0xffffffff; <br /> rGPEDAT = 0xffffc7ff; <br /> rGPEDAT = 0xffffffff; <br /> rGPEDAT = 0xffffc7ff; <br /> rGPEDAT = 0xffffffff; <br /> }<br />测试LED端口发现LED端口波形大概为0.5us on,0.5us off<br />理论上端口波形至少在202.8/4(pclk)/4(端口操作大概四个时钟周期)=12.675MHZ<br />郁闷！<br /><br /> |
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