用用DMA实现多路实现多路ADC通道数据采集通道数据采集
今天尝试了下STM32的ADC采样,并利用DMA实现采样数据的直接搬运存储,这样就不用CPU去参与操作了。
找了不少例子参考,ADC和DMA的设置了解了个大概,并直接利用开发板来做一些实验来验证相关的操作,保证自己对各部
分设置的理解。
我这里用了3路的ADC通道,1路外部变阻器输入,另外两路是内部的温度采样和Vrefint,这样就能组成连续的采样,来测试
多通道ADC自动扫描了,ADC分规则转换和注入转换,其实规则转换就是按照既定的设定来顺序转换,而注入转换就是可以
在这顺序队列中插队一样,能够提前转换了。
初始化设置:
1 //PC0 FOR ANAGLE SAMPLE
2 static void Protect_ClkInit(void)
3 {
4 RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1|RCC_APB2Periph_GPIOC,ENABLE);
5 RCC_ADCCLKConfig(RCC_PCLK2_Div6);
6 RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
7 }
8
9 static void Protect_GPIOInit(void)
10 {
11 GPIO_InitTypeDef GPIO_InitStructure;
12
13 /*GPIO PhaseA_H 初始化*/
14 GPIO_InitStructure.GPIO_Pin = ADC_PIN;
15 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;
16 GPIO_Init(TIMER_GPIO_AH_PORT, &GPIO_InitStructure);
17 }
18
19 static void Protect_AdcInit(void)
20 {
21 ADC_InitTypeDef ADC_InitStructure;
22
23 ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
24 ADC_InitStructure.ADC_ScanConvMode = ENABLE;
25 ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
26 ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;
27 ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
28 ADC_InitStructure.ADC_NbrOfChannel = 3;
29 ADC_Init(ADC1, &ADC_InitStructure);
30
31 ADC_TempSensorVrefintCmd(ENABLE);
32 ADC_RegularChannelConfig(ADC1,ADC_Channel_10,1,ADC_SampleTime_7Cycles5);
33 ADC_RegularChannelConfig(ADC1,ADC_Channel_TempSensor,2,ADC_SampleTime_7Cycles5);
34 ADC_RegularChannelConfig(ADC1,ADC_Channel_Vrefint,3,ADC_SampleTime_7Cycles5);
35
36 ADC_DMACmd(ADC1, ENABLE);
37 /* Enable ADC1 external trigger */
38 ADC_ExternalTrigConvCmd(ADC1, DISABLE);
39
40 ADC_Cmd(ADC1, ENABLE);
41
42 ADC_ResetCalibration(ADC1);
43
44 while(ADC_GetResetCalibrationStatus(ADC1));
45
46 ADC_StartCalibration(ADC1);
47
48 while(ADC_GetCalibrationStatus(ADC1));
49
50 }
51
52 static void Protect_DMAInit(void)
53 {
54
55 DMA_InitTypeDef DMA_InitStructure;
56
57 /* DMA1 channel1 configuration ----------------------------------------------*/
58 DMA_DeInit(DMA1_Channel1);
59 DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t) & (ADC1->DR);
60 DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&ADCConvertedValue;
61 DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
62 DMA_InitStructure.DMA_BufferSize = 3;
63 DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
64 DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
65 DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
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