1 | GPIO_InitTypeDef GPIO_InitStructure;
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2 | TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
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3 | TIM_OCInitTypeDef TIM_OCInitStructure;
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4 |
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5 | RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
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6 | RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, s)
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7 |
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8 | // Ausgangs-Pin für das PWM-Signal
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9 | GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
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10 | GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
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11 | GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;
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12 | GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
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13 | GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
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14 | GPIO_Init(GPIOB, &GPIO_InitStructure);
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15 |
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16 | // Mapping für den PWM Ausgangs-Pin
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17 | GPIO_PinAFConfig(GPIOB, GPIO_PinSource13, GPIO_AF_TIM4);
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18 |
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19 | // Konfiguriert den Timer
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20 | TIM_TimeBaseStructure.TIM_Period = 100 - 1;
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21 | TIM_TimeBaseStructure.TIM_Prescaler = (SystemCoreClock / 1000000) - 1;
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22 | TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
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23 | TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
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24 | TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
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25 |
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26 | // Konfiguriert den PWM Kanal
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27 | TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
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28 | TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
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29 | TIM_OCInitStructure.TIM_Pulse = 0;
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30 | TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
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31 | TIM_OC1Init(TIM4, &TIM_OCInitStructure);
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32 |
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33 | TIM_OC1PreloadConfig(TIM4, TIM_OCPreload_Enable);
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34 | TIM_ARRPreloadConfig(TIM4, ENABLE);
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35 | TIM_Cmd(TIM4, ENABLE);
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36 |
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37 |
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38 | // Später dann Änderung der Helligkeit mit
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39 | int brightness; // 0=0%, 1=10%, 10=100%
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40 | int pulse = 10 - brightness * 10;
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41 | TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
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42 | TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
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43 | TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
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44 | TIM_OCInitStructure.TIM_Pulse = pulse;
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45 | TIM_OC1Init(TIM4, &TIM_OCInitStructure);
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PWM-LED.png
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