1 | #define ADC1_DR_ADDRESS ((uint32_t)0x4001204C)
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2 |
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3 | __IO uint16_t ADC1ConvertedValue;
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4 |
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5 | void Hardware_AD_Init(void)
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6 | {
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7 | ADC_InitTypeDef ADC_InitStructure;
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8 | ADC_CommonInitTypeDef ADC_CommonInitStructure;
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9 | DMA_InitTypeDef DMA_InitStructure;
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10 | GPIO_InitTypeDef GPIO_InitStructure;
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11 |
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12 | /* Enable ADC1, DMA2 and GPIO clocks ****************************************/
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13 | RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2 | RCC_AHB1Periph_GPIOA, ENABLE);
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14 | RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
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15 |
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16 | /* DMA2 Stream0 channel0 configuration **************************************/
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17 | DMA_InitStructure.DMA_Channel = DMA_Channel_0;
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18 | DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_ADDRESS;
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19 | DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADC1ConvertedValue;
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20 | DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
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21 | DMA_InitStructure.DMA_BufferSize = 1;
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22 | DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
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23 | DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;
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24 | DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
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25 | DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
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26 | DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
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27 | DMA_InitStructure.DMA_Priority = DMA_Priority_High;
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28 | DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
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29 | DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
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30 | DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
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31 | DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
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32 | DMA_Init(DMA2_Stream0, &DMA_InitStructure);
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33 | DMA_Cmd(DMA2_Stream0, ENABLE);
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34 |
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35 | /* Configure ADC1 as analog input
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36 | *********************************************************/
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37 | GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
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38 | GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
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39 | GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
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40 | GPIO_Init(GPIOA, &GPIO_InitStructure);
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41 |
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42 | /* ADC Common Init **********************************************************/
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43 | ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
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44 | ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
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45 | ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
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46 | ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
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47 | ADC_CommonInit(&ADC_CommonInitStructure);
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48 |
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49 | /* ADC1 Init ****************************************************************/
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50 | ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
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51 | ADC_InitStructure.ADC_ScanConvMode = DISABLE;
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52 | ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
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53 | ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
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54 | ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
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55 | ADC_InitStructure.ADC_NbrOfConversion = 1;
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56 | ADC_Init(ADC1, &ADC_InitStructure);
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57 |
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58 | /* ADC1 regular channel1 configuration *************************************/
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59 | ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 1, ADC_SampleTime_3Cycles);
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60 |
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61 | /* Enable DMA request after last transfer (Single-ADC mode) */
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62 | ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);
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63 |
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64 | /* Enable ADC1 DMA */
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65 | ADC_DMACmd(ADC1, ENABLE);
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66 |
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67 | /* Enable ADC1 */
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68 | ADC_Cmd(ADC1, ENABLE);
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69 | }
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70 |
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71 | void StartConversion(void)
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72 | {
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73 | ADC_SoftwareStartConv(ADC1); // A/D convert start
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74 | }
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75 |
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76 | UINT16 ui16_Read_ADC1_ConvertedValue(void)
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77 | {
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78 | return ADC1ConvertedValue; // Read and return conversion result
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79 | }
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