1 | TIM2_Config()
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2 | {
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3 | TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
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4 |
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5 | RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
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6 | TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
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7 | TIM_TimeBaseStructure.TIM_Period = 84-1; // 1000Hz
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8 | TIM_TimeBaseStructure.TIM_Prescaler = 1000-1; // 84000hz
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9 | TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
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10 | TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
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11 | TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
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12 | TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Update);
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13 | //TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
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14 | }
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15 |
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16 | adc_dma_init()
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17 | {
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18 | ADC_InitTypeDef ADC_InitStructure;
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19 | ADC_CommonInitTypeDef ADC_CommonInitStructure;
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20 | DMA_InitTypeDef DMA_InitStructure;
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21 | GPIO_InitTypeDef GPIO_InitStructure;
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22 | RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2 | RCC_AHB1Periph_GPIOA, ENABLE);
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23 | RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC3, ENABLE);
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24 | DMA_InitStructure.DMA_Channel = DMA_Channel_2;
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25 | DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC3_DR_ADDRESS;
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26 | DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADC3ConvertedValue;
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27 | DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
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28 | DMA_InitStructure.DMA_BufferSize = 160;
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29 | DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
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30 | DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
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31 | DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
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32 | DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
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33 | DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
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34 | DMA_InitStructure.DMA_Priority = DMA_Priority_High;
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35 | DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
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36 | DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
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37 | DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
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38 | DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
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39 | DMA_Init(DMA2_Stream0, &DMA_InitStructure);
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40 | DMA_Cmd(DMA2_Stream0, ENABLE);
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41 |
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42 | GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
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43 | GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
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44 | GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
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45 | GPIO_Init(GPIOA, &GPIO_InitStructure);
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46 |
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47 | ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
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48 | ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
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49 | ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
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50 | ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
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51 | ADC_CommonInit(&ADC_CommonInitStructure);
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52 | ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
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53 | ADC_InitStructure.ADC_ScanConvMode = DISABLE;
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54 | ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
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55 | ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_Rising;
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56 | ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T2_TRGO;
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57 | ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
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58 | ADC_InitStructure.ADC_NbrOfConversion = 1;
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59 | ADC_Init(ADC3, &ADC_InitStructure);
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60 | ADC_RegularChannelConfig(ADC3, ADC_Channel_1, 1, ADC_SampleTime_15Cycles);
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61 | ADC_DMARequestAfterLastTransferCmd(ADC3, ENABLE);
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62 | ADC_DMACmd(ADC3, ENABLE);
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63 | ADC_Cmd(ADC3, ENABLE);
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64 | }
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65 |
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66 |
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67 | int main(void)
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68 | {
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69 |
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70 | SystemInit();
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71 |
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72 | TIM2_Config();
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73 | adc_dma_init();
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74 | TIM_Cmd(TIM2, ENABLE);
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75 |
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76 | while(1)
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77 | {
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78 |
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79 | DMA_ClearFlag(DMA2_Stream0, DMA_FLAG_TCIF0);
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80 | while(!DMA_GetFlagStatus(DMA2_Stream0, DMA_FLAG_TCIF0));
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81 |
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82 | //... ab hier die gemessenen Werte aus dem Buffer lesen und
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83 | //verarbeiten...
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84 | }
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85 | }
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