stm32adc多通道采集
时间: 2023-09-02 07:12:16 浏览: 133
在STM32中,ADC转换器支持多通道采集。以下是一个基本的多通道采集代码示例:
1. 首先,需要初始化ADC以及将其连接到GPIO引脚。
```
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE); //使能ADC1时钟
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE); //使能GPIOA时钟
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1; //PA0, PA1
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN; //模拟输入
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;//不带上下拉
GPIO_Init(GPIOA, &GPIO_InitStructure);
ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div4;
ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
ADC_CommonInit(&ADC_CommonInitStructure);
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStructure.ADC_ScanConvMode = ENABLE;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfConversion = 2; //2个通道
ADC_Init(ADC1, &ADC_InitStructure);
ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_28Cycles);//配置ADC1通道0
ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 2, ADC_SampleTime_28Cycles);//配置ADC1通道1
ADC_Cmd(ADC1, ENABLE);
```
2. 接下来,设置ADC的DMA模式,以便将结果存储到内存中。
```
DMA_InitTypeDef DMA_InitStructure;
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
DMA_InitStructure.DMA_BufferSize = 2; //2个通道
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)(&(ADC1->DR));
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)ADC_ConvertedValue;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel1, &DMA_InitStructure);
DMA_Cmd(DMA1_Channel1, ENABLE);
ADC_DMACmd(ADC1, ENABLE);
```
3. 最后,启动ADC转换并等待结果。
```
ADC_SoftwareStartConv(ADC1);
while (1)
{
if (DMA_GetFlagStatus(DMA1_FLAG_TC1) != RESET)
{
DMA_ClearFlag(DMA1_FLAG_TC1);
for (i = 0; i < 2; i++)
{
printf("%d\n", ADC_ConvertedValue[i]);
}
}
}
```
这个代码示例中,我们配置了ADC1的两个通道,将结果存储到一个数组中,并使用DMA模式将结果传输到内存中。最后,我们启动ADC转换并等待DMA传输完成,然后打印结果。
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