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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>: <20><>ʾ<EFBFBD><CABE><EFBFBD>ε<EFBFBD><CEB5><EFBFBD>pwm<77><6D><EFBFBD><EFBFBD>ʵ<EFBFBD>ֶ<EFBFBD><D6B6><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ź<EFBFBD><C5BA><EFBFBD><EFBFBD><EFBFBD>
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʽ:
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Usage: usage: ./sample_pwm PwmNum Freq DutyRatio
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD>˵<EFBFBD><EFBFBD>:
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PwmNum<75><6D> pwm number;
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Freq: pwmƵ<6D><C6B5>
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DutyRatio<69><6F>pwmռ<6D>ձ<EFBFBD>(<28><>Χ<EFBFBD><CEA7>0-1000)
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ע<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>: 1.<2E><>ʹ<EFBFBD><CAB9>pwm<77><6D><EFBFBD><EFBFBD>ʱ<EFBFBD><CAB1>ȷ<EFBFBD><C8B7>gpio<69>ܽŵķ<C5B5><C4B7><EFBFBD>Ϊ<EFBFBD><CEAA><EFBFBD><EFBFBD>.
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2.<2E><><EFBFBD><EFBFBD>Ƶ<EFBFBD>ʺ<EFBFBD>ռ<EFBFBD>ձȿ<D5B1><C8BF>ܴ<EFBFBD><DCB4>ڲ<EFBFBD><DAB2><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ<EFBFBD><D6B5>ͨ<EFBFBD><CDA8><EFBFBD>ӿڻ<D3BF>ȡ<EFBFBD><C8A1><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ<EFBFBD><D6B5><EFBFBD><EFBFBD>ȫ<EFBFBD><C8AB>ͬ<EFBFBD><CDAC><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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ԭ<><D4AD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƶ<EFBFBD>ʵķ<CAB5><C4B7><EFBFBD>Ϊ<EFBFBD><CEAA>54M<34>Ļ<EFBFBD><C4BB><EFBFBD>ʱ<EFBFBD><CAB1><EFBFBD><EFBFBD>ʹ<EFBFBD>÷<EFBFBD>Ƶϵ<C6B5><CFB5><EFBFBD><EFBFBD><EFBFBD>з<EFBFBD>Ƶ<EFBFBD><C6B5><EFBFBD><EFBFBD>Ƶϵ<C6B5><CFB5>ΪƵ<CEAA>ʿ<EFBFBD><CABF>ƼĴ<C6BC><C4B4><EFBFBD><EFBFBD>е<EFBFBD>ֵ<EFBFBD><D6B5>
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<20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ƶ<EFBFBD><C6B5>ʱ<EFBFBD><CAB1>Ҫ<EFBFBD><D2AA>Ƶ<EFBFBD>ʿ<EFBFBD><CABF>ƼĴ<C6BC><C4B4><EFBFBD><EFBFBD><EFBFBD>д<EFBFBD><D0B4><EFBFBD><EFBFBD><EFBFBD>õ<EFBFBD>Ƶ<EFBFBD><C6B5>ֵ<EFBFBD><D6B5><EFBFBD><EFBFBD>54MȻ<4D><C8BB><EFBFBD><EFBFBD>ֵ<EFBFBD><D6B5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><D2AA><EFBFBD><EFBFBD>10M<30><4D>ʱ<EFBFBD>ӣ<EFBFBD>Ƶ<EFBFBD>ʿ<EFBFBD><CABF>ƼĴ<C6BC><C4B4><EFBFBD><EFBFBD>е<EFBFBD>ϵ<EFBFBD><CFB5>ֵΪ<D6B5><CEAA>54M / 10M = 5.4<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ5<EFBFBD><EFBFBD>
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Ȼ<><C8BB>ͨ<EFBFBD><CDA8><EFBFBD><EFBFBD>ȡƵ<C8A1>ʵĽӿ<C4BD>ȥ<EFBFBD><C8A5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>õ<EFBFBD>Ƶ<EFBFBD>ʿ<EFBFBD><CABF>ƼĴ<C6BC><C4B4><EFBFBD><EFBFBD>е<EFBFBD>ϵ<EFBFBD><CFB5>ֵΪ5<CEAA><35>54M / 5 = 10.8M,<2C><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ11M<31><4D>
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<20><><EFBFBD><EFBFBD>ռ<EFBFBD>ձȵķ<C8B5><C4B7><EFBFBD>Ϊ<EFBFBD><CEAA>255<35><35><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>У<EFBFBD><D0A3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ1000<30>ȷ֣<C8B7><D6A3><EFBFBD><EFBFBD><EFBFBD>DutyRatioΪ<6F>ߵ<EFBFBD>ƽ<EFBFBD><C6BD>ʱ<EFBFBD>䡣ռ<E4A1A3>ձȿ<D5B1><C8BF>ƼĴ<C6BC><C4B4><EFBFBD><EFBFBD><EFBFBD>д<EFBFBD><D0B4><EFBFBD><EFBFBD>ֵΪ DutyRatio / 1000 * 255;
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<20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><D2AA><EFBFBD>õ<EFBFBD>ռ<EFBFBD><D5BC>ֵΪ700<30><30> 700 / 1000 * 255 = 178.5 д<><D0B4><EFBFBD>Ĵ<EFBFBD><C4B4><EFBFBD><EFBFBD><EFBFBD>ֵΪ178<37><38>
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Ȼ<><C8BB>ͨ<EFBFBD><CDA8><EFBFBD><EFBFBD>ȡռ<C8A1>ձȵĽӿ<C4BD>ȥ<EFBFBD><C8A5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>õ<EFBFBD>ռ<EFBFBD>ձȿ<D5B1><C8BF>ƼĴ<C6BC><C4B4><EFBFBD><EFBFBD>е<EFBFBD>ϵ<EFBFBD><CFB5>ֵΪ178<37><38>178 / 255 * 1000 = 698.03<EFBFBD><EFBFBD>ȡֵΪ698.
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