1 | typedef struct ADCValues
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2 | {
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3 | uint16_t channel0;
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4 | uint16_t channel1;
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5 | uint16_t channel2;
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6 | uint16_t channel3;
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7 | uint16_t spare;
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8 | } ADCValues_t;
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9 |
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10 | // DMA Target for ADC
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11 | volatile ADCValues_t ADCRead;
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12 |
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13 | /* temporary use the internal 12-bit ADC for audio input, but it sounds bad */
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14 | void ADCInit(void) {
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15 | ADC_CommonInitTypeDef ADC_CommonInitStructure;
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16 | ADC_InitTypeDef ADC_InitStructure;
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17 | DMA_InitTypeDef DMA_InitStructure;
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18 |
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19 | RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1,ENABLE);
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20 | RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);
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21 | /* ADC1 configuration
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22 | * 4 channel continuous
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23 | */
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24 | //ADC_DeInit(ADC1);
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25 | ADC_CommonStructInit(&ADC_CommonInitStructure);
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26 | ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
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27 | ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div4;
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28 | ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
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29 | ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
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30 | ADC_CommonInit(&ADC_CommonInitStructure);
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31 |
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32 | ADC_StructInit(&ADC_InitStructure);
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33 | ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
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34 | ADC_InitStructure.ADC_ScanConvMode = ENABLE;
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35 | ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
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36 | ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
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37 | ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T3_TRGO;
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38 | ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Left;
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39 | ADC_InitStructure.ADC_NbrOfConversion = 4;
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40 | /* Now do the setup */
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41 | ADC_Init(ADC1, &ADC_InitStructure);
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42 | /* Enable ADC1 and configure channels*/
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43 | ADC_RegularChannelConfig(ADC1,INPUT0_CHANNEL,1,ADC_SampleTime_15Cycles);
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44 | ADC_RegularChannelConfig(ADC1,INPUT1_CHANNEL,2,ADC_SampleTime_15Cycles);
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45 | ADC_RegularChannelConfig(ADC1,INPUT2_CHANNEL,3,ADC_SampleTime_15Cycles);
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46 | ADC_RegularChannelConfig(ADC1,INPUT3_CHANNEL,4,ADC_SampleTime_15Cycles);
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47 |
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48 | /* DMA1 channel1 configuration ----------------------------------------------*/
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49 | DMA_DeInit(DMA2_Stream0); // Clear everything we had
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50 | DMA_StructInit(&DMA_InitStructure);
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51 | DMA_InitStructure.DMA_Channel = DMA_Channel_0;
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52 | DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&(ADC1->DR); // source address
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53 | DMA_InitStructure.DMA_Memory0BaseAddr = (u32)&ADCRead.channel0; // result memory location
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54 | DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory; // from Peripheral to RAM
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55 | DMA_InitStructure.DMA_BufferSize = 2; /// Note that we have 4 Channels
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56 | DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; // Source stays same address
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57 | DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; // Destination will be incremented
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58 | DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; // 16 bit results
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59 | DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; // yeah same size -> 16 bit
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60 | DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; // Wrap around the destination address
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61 | DMA_InitStructure.DMA_Priority = DMA_Priority_Medium; //
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62 | DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
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63 | DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
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64 | DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
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65 | DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
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66 | DMA_Init(DMA2_Stream0, &DMA_InitStructure); // Init the stuff finally
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67 | DMA_Cmd(DMA2_Stream0,ENABLE);
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68 | // wait for the DMA Stream to be ready
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69 | while(DMA_GetCmdStatus(DMA2_Stream0)==DISABLE){};
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70 | // now run the ADC
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71 | ADC_DMACmd(ADC1, ENABLE);
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72 | ADC_Cmd(ADC1, ENABLE);
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73 | ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);
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74 | ADC_ContinuousModeCmd(ADC1,ENABLE);
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75 | ADC_SoftwareStartConv(ADC1);
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76 | }
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