1 | // ***********************************************************************
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2 | // PWM Initialisierung LCD- und TFT-Hintergrundbeleuchtung
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3 | // Timer 3, Kanal 3 (TFT), Kanal 4 (LCD)
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4 | // Signal: TFTLED, LCDLED
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5 | // ***********************************************************************
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6 | void init_pwm_tftlcd (void) {
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7 | #define TIMER_TAKT3 1000000 /* Timer wird mit 1MHz getaktet */
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8 | TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
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9 | TIM_OCInitTypeDef TIM_OCInitStructure;
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10 | uint16_t PrescalerValue;
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11 |
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12 | RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); // TIMER 3 Takt freigeben
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13 | PrescalerValue = (uint16_t) (SystemCoreClock / TIMER_TAKT3) - 1; // Vorteiler berechnen
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14 |
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15 | // Timer Grundkonfiguration
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16 | TIM_TimeBaseStructure.TIM_Period = 1000; // Timer zählt von 0 .. 1000 entspricht 1kHz PWM-Grundfrequenz
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17 | TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue;
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18 | TIM_TimeBaseStructure.TIM_ClockDivision = 0;
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19 | TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; // Zählrichtung (hoch)
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20 | TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); // Timer einstellen
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21 |
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22 | // PWM1 Mode Configuration: Kanal 3 PB0=TFTLED
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23 | TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
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24 | TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
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25 | TIM_OCInitStructure.TIM_Pulse = 0; // Dutty-Cycle:
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26 | TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
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27 | TIM_OC3Init(TIM3, &TIM_OCInitStructure);
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28 | TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable);
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29 |
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30 | // PWM1 Mode Configuration: Kanal 4 PB1=LCDLED
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31 | TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
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32 | TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
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33 | TIM_OCInitStructure.TIM_Pulse = 0; // Dutty-Cycle:
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34 | TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
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35 | TIM_OC4Init(TIM3, &TIM_OCInitStructure);
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36 | TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Enable);
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37 |
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38 | TIM_ARRPreloadConfig(TIM3, ENABLE);
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39 | TIM_Cmd(TIM3, ENABLE);
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40 | }
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41 |
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42 | ...
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43 |
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44 | // ***********************************************************************
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45 | // TFT/LCD Hintergrundbeleuchtung - Helligkeit einstellen
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46 | // Übergabe: anzeige: 0=TFT, 1=LCD
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47 | // helligkeit: 0 ... 1000 (0=Aus, 500=50%, 1000=Max.)
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48 | // ***********************************************************************
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49 | void set_hgbl (uint8_t anzeige, uint16_t helligkeit) {
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50 | TIM_OCInitTypeDef TIM_OCInitStructure;
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51 |
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52 | TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
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53 | TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
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54 | TIM_OCInitStructure.TIM_Pulse = helligkeit;
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55 | TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
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56 |
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57 | if (anzeige) {
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58 | // TFT Hintergrundbeleuchtung
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59 | TIM_OC3Init(TIM3, &TIM_OCInitStructure);
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60 | } else {
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61 | // LCD Hintergrundbeleuchtung
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62 | TIM_OC4Init(TIM3, &TIM_OCInitStructure);
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63 | }
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64 | }
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