1 | void ADCInit(){
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2 | GPIO_InitTypeDef GPIO_InitStructure;
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3 | ADC_CommonInitTypeDef ADC_CommonInitStructure;
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4 | ADC_InitTypeDef ADC_InitStructure;
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5 | DMA_InitTypeDef DMA_InitStructure;
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6 | NVIC_InitTypeDef NVIC_InitStructure;
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7 |
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8 | adcBuffer.bufFFT=0; // no buffer assigned -> no execution
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9 | for(int i=0;i<ADC_BUFFER_LENGTH;i++){
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10 | adcBuffer.bufA[i]=0;
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11 | adcBuffer.bufB[i]=0;
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12 | }
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13 | adcBuffer.streamAEnabled = FALSE;
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14 | adcBuffer.streamBEnabled = FALSE;
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15 |
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16 | RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
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17 | RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC2, ENABLE);
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18 |
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19 | // initialize I/O's
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20 | GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
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21 | GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
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22 | GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
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23 | GPIO_Init(GPIOA, &GPIO_InitStructure);
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24 |
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25 | // initialize common ADC
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26 | ADC_CommonInitStructure.ADC_Mode = ADC_DualMode_RegSimult;
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27 | ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div4;
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28 | ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_1;
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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 | // initialize ADC1 & ADC2
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33 | ADC_InitStructure.ADC_Resolution = ADC_Resolution_10b;
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34 | ADC_InitStructure.ADC_ScanConvMode = DISABLE;
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35 | ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
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36 | ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_Rising;
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37 | ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T2_TRGO;
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38 | ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
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39 | ADC_InitStructure.ADC_NbrOfConversion = 1;
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40 | ADC_Init(ADC1, &ADC_InitStructure);
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41 | ADC_Init(ADC2, &ADC_InitStructure);
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42 |
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43 | // ADC1 & ADC2 regular channel configuration
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44 | // ADC1: CH0 at pin A0
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45 | // ADC2: CH1 at pin A1
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46 | ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_3Cycles);
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47 | ADC_RegularChannelConfig(ADC2, ADC_Channel_1, 1, ADC_SampleTime_3Cycles);
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48 |
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49 | // enable DMA request after last transfer
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50 | ADC_MultiModeDMARequestAfterLastTransferCmd(ENABLE);
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51 |
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52 | // initialize DMA streams
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53 | // both streams are filling the buffers circular
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54 | // the half transfer interrupt is used to switch the pointers
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55 | // second DMA stream starts, when first stream has filled half buffer
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56 | DMA_Cmd(DMA2_Stream0, DISABLE);
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57 | DMA_Cmd(DMA2_Stream4, DISABLE);
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58 | DMA_DeInit(DMA2_Stream0);
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59 | DMA_DeInit(DMA2_Stream4);
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60 | DMA_InitStructure.DMA_Channel = DMA_Channel_0;
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61 | DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADC->CDR;
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62 | DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)(&adcBuffer.bufA);
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63 | DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
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64 | DMA_InitStructure.DMA_BufferSize = ADC_BUFFER_LENGTH;
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65 | DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
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66 | DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
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67 | DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; // 16 bit
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68 | DMA_InitStructure.DMA_MemoryDataSize = DMA_PeripheralDataSize_HalfWord; // 16bit per Transfer
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69 | DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
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70 | DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
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71 | DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Enable;
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72 | DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_1QuarterFull; // may replace by FULL
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73 | DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
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74 | DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
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75 | DMA_Init(DMA2_Stream0, &DMA_InitStructure);
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76 | DMA_InitStructure.DMA_Channel = DMA_Channel_0;
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77 | DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)(&adcBuffer.bufB);
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78 | DMA_Init(DMA2_Stream4, &DMA_InitStructure);
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79 |
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80 | // configure DMA half transfer complete interrupt
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81 | NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream0_IRQn;
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82 | NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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83 | NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = NVIC_PRIORITY_DMA2_STREAM0;
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84 | NVIC_InitStructure.NVIC_IRQChannelSubPriority = NVIC_SUBPRIORITY_DMA2_STREAM0;
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85 | NVIC_Init(&NVIC_InitStructure);
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86 |
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87 | NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream4_IRQn;
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88 | NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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89 | NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = NVIC_PRIORITY_DMA2_STREAM4;
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90 | NVIC_InitStructure.NVIC_IRQChannelSubPriority = NVIC_SUBPRIORITY_DMA2_STREAM4;
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91 | NVIC_Init(&NVIC_InitStructure);
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92 |
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93 | // enable DMA half transfer complete interrupt
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94 | DMA_ITConfig(DMA2_Stream0, DMA_IT_HT, ENABLE);
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95 | DMA_ITConfig(DMA2_Stream4, DMA_IT_HT, ENABLE);
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96 |
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97 | // enable DMA streams
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98 | adcBuffer.streamAEnabled = TRUE;
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99 | DMA_Cmd(DMA2_Stream0, ENABLE);
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100 | DMA_Cmd(DMA2_Stream4, ENABLE); // enabled during HT interrupt of other channel
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101 |
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102 | // enable ADC
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103 | ADC_Cmd(ADC1, ENABLE);
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104 | ADC_Cmd(ADC2, ENABLE);
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105 |
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106 | // sampling will start as soon as timer generates trigger
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107 | }
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108 |
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109 | void DMA2_Stream0_IRQHandler(void){
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110 | // transfer complete interrupt
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111 | if(DMA_GetITStatus(DMA2_Stream0, DMA_IT_HTIF0)==SET){
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112 | // clear pending interrupt
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113 | DMA_ClearITPendingBit(DMA2_Stream0, DMA_IT_HTIF0);
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114 | // enable other channel
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115 | DMA_Cmd(DMA2_Stream4, ENABLE);
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116 | // change buffer pointer to corresponding buffer
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117 | adcBuffer.bufFFT = adcBuffer.bufA;
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118 |
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119 | // print buffer
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120 | usart2Printf("bufA HT\n\r");
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121 | for(int i=0;i<ADC_BUFFER_LENGTH;i++){
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122 | itoa(adcBuffer.bufA[i],tmp,10);
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123 | usart2Printf(tmp);
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124 | usart2Printf("\t");
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125 | itoa(adcBuffer.bufB[i],tmp,10);
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126 | usart2Printf(tmp);
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127 | usart2Printf("\n\r");
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128 | }
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129 | }
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130 | }
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131 |
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132 | void DMA2_Stream4_IRQHandler(void){
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133 | // transfer complete interrupt
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134 | if(DMA_GetITStatus(DMA2_Stream4, DMA_IT_HTIF4)==SET){
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135 | // clear pending interrupt
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136 | DMA_ClearITPendingBit(DMA2_Stream4, DMA_IT_HTIF4);
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137 | // enable other channel
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138 | DMA_Cmd(DMA2_Stream0, ENABLE);
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139 | // change buffer pointer to corresponding buffer
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140 | adcBuffer.bufFFT = adcBuffer.bufB;
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141 |
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142 | // print buffer
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143 | usart2Printf("bufB HT\n\r");
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144 | for(int i=0;i<ADC_BUFFER_LENGTH;i++){
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145 | itoa(adcBuffer.bufA[i],tmp,10);
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146 | usart2Printf(tmp);
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147 | usart2Printf("\t");
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148 | itoa(adcBuffer.bufB[i],tmp,10);
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149 | usart2Printf(tmp);
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150 | usart2Printf("\n\r");
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151 | }
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152 | }
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153 | }
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