在项目开发中,经常需要用到ADC采样的做电压检测,而且多通道ADC检测的情况比较多,所以本篇基于此要求采用了ADC DMA的方法,下面先给出基础代码(STM32F030)!
#define ADC1_DR_Address 0x40012440
#define ADC1_DR_Address 0x40012440
//对应需要检测的ADC通道个数
#define ADC_DMA_BUFFER_SIZE 2
//按照通道顺序依次存放得到的ADC值
__IO uint16_t RegularConvData_Tab[ADC_DMA_BUFFER_SIZE] = {0, 0};
/**
* [url=home.php?mod=space&uid=247401]@brief[/url] DMA channel1 configuration
* @param None
* @retval None
*/
void DMA_Config(void)
{
DMA_InitTypeDef DMA_InitStructure;
/* DMA1 clock enable */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
/* DMA1 Channel1 Config */
DMA_DeInit(DMA1_Channel1);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_Address;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)RegularConvData_Tab;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = ADC_DMA_BUFFER_SIZE;
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);
/* DMA1 Channel1 enable */
DMA_Cmd(DMA1_Channel1, ENABLE);
}
void ADC_DMA_Config(void)
{
ADC_InitTypeDef ADC_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
DMA_Config();
/* ADC1 DeInit */
ADC_DeInit(ADC1);
/* ADC1 Periph clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
/* Configure ADC Channel11 and channel10 as analog input */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
RCC_AHBPeriphClockCmd(P_N_TEST_CLK, ENABLE);
GPIO_InitStructure.GPIO_Pin = P_N_TEST_PIN ;
GPIO_Init(P_N_TEST_PORT, &GPIO_InitStructure);
RCC_AHBPeriphClockCmd(DC5V_TEST_CLK, ENABLE);
GPIO_InitStructure.GPIO_Pin = DC5V_TEST_PIN ;
GPIO_Init(DC5V_TEST_PORT, &GPIO_InitStructure);
/* Initialize ADC structure */
ADC_StructInit(&ADC_InitStructure);
/* Configure the ADC1 in continuous mode withe a resolution equal to 12 bits */
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_ScanDirection = ADC_ScanDirection_Upward;
ADC_Init(ADC1, &ADC_InitStructure);
ADC_ChannelConfig(ADC1, DC5V_TEST_channel,ADC_SampleTime_239_5Cycles);
ADC_ChannelConfig(ADC1, P_N_TEST_channel, ADC_SampleTime_239_5Cycles);
/* ADC Calibration */
ADC_GetCalibrationFactor(ADC1);
/* ADC DMA request in circular mode */
ADC_DMARequestModeConfig(ADC1, ADC_DMAMode_Circular);
/* Enable ADC_DMA */
ADC_DMACmd(ADC1, ENABLE);
/* Enable the ADC peripheral */
ADC_Cmd(ADC1, ENABLE);
/* Wait the ADRDY flag */
while (!ADC_GetFlagStatus(ADC1, ADC_FLAG_ADRDY));
/* ADC1 regular Software Start Conv */
ADC_StartOfConversion(ADC1);
}
ADC按照通道顺序循环采样并转换数据,然后DMA自动将对应的数据搬运至RegularConvData_Tab[]数组中。
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