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描述：用ADC连续采集11路模拟信号，并由DMA传输到内存。
#define ADC1_DR_Address 0x40012440
__IO uint16_t RegularConvData_Tab[2];
__IO uint16_t ADC_ConvertedValueLocal1[AD_Array_Size];
__IO uint16_t ADC_ConvertedValueLocal2[AD_Array_Size];
uint8_t AD_Array_count=0;
void ADC1_DMA_Init(void)
{
ADC_InitTypeDef ADC_InitStruct;
DMA_InitTypeDef DMA_InitStruct;
GPIO_InitTypeDef GPIO_InitStruct;
NVIC_InitTypeDef NVIC_InitStruct;
/* ADC1 DeInit */
ADC_DeInit(ADC1);
/* Enable GPIOA clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
/* ADC1 Periph clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);
/* DMA1 clock enable */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1 , ENABLE);
/* Configure PA.1 as analog input */
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_1 |GPIO_Pin_2;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL ;
GPIO_Init(GPIOA, &GPIO_InitStruct);
//DMA NVIC
NVIC_InitStruct.NVIC_IRQChannel = DMA1_Channel1_IRQn;
NVIC_InitStruct.NVIC_IRQChannelPriority = 2;
NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStruct);
/* DMA1 Channel1 Config */
DMA_DeInit(DMA1_Channel1);
DMA_InitStruct.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_Address;//ÉèÖÃÍâÉèµØÖ·
DMA_InitStruct.DMA_MemoryBaseAddr = (uint32_t)RegularConvData_Tab;//ÅäÖÃÄÚ´æÓ³ÉäµØÖ·
DMA_InitStruct.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStruct.DMA_BufferSize = 2;
DMA_InitStruct.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStruct.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStruct.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStruct.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStruct.DMA_Mode = DMA_Mode_Circular;
DMA_InitStruct.DMA_Priority = DMA_Priority_High;
DMA_InitStruct.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel1, &DMA_InitStruct);
/* DMA1 Channel1 enable */
DMA_Cmd(DMA1_Channel1, ENABLE);
/*Enables the specified DMAy Channelx interrupts */
DMA_ITConfig(DMA1_Channel1,DMA_IT_TC,ENABLE);
/* ADC DMA request in circular mode */
ADC_DMARequestModeConfig(ADC1, ADC_DMAMode_Circular);
/* Enable ADC_DMA */
ADC_DMACmd(ADC1, ENABLE);
/* Initialize ADC structure */
ADC_StructInit(&ADC_InitStruct);
/* Configure the ADC1 in continous mode withe a resolutuion equal to 12 bits */
ADC_InitStruct.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStruct.ADC_ContinuousConvMode = ENABLE;
ADC_InitStruct.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_InitStruct.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStruct.ADC_ScanDirection = ADC_ScanDirection_Backward;
ADC_Init(ADC1, &ADC_InitStruct);
ADC_ChannelConfig(ADC1, ADC_Channel_1, ADC_SampleTime_55_5Cycles);
ADC_ChannelConfig(ADC1, ADC_Channel_2, ADC_SampleTime_55_5Cycles);
/* ADCУ׼ */
ADC_GetCalibrationFactor(ADC1);
/* Enable ADC1 */
ADC_Cmd(ADC1, ENABLE);
while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_ADRDY));
/* ADC1 regular Software Start Conv */
ADC_StartOfConversion(ADC1);
}
DMA中断函数
void DMA1_Channel1_IRQHandler(void)
{
if(DMA_GetFlagStatus(DMA1_FLAG_TC1) != RESET)
{
if(AD_Array_count>=AD_Array_Size)
{
DMA_ClearFlag(DMA1_FLAG_TC1);
}
else
{
ADC_ConvertedValueLocal1[AD_Array_count]=RegularConvData_Tab[0];
ADC_ConvertedValueLocal2[AD_Array_count]=RegularConvData_Tab[1];
DMA_ClearFlag(DMA1_FLAG_TC1);
AD_Array_count++;
}
}
}
问题，PA1接低电平，PA2接高电平，通过串口显示DMA读取的数据应该是低，高，但实际结果却是（每组结果显示两次）
0000
0000
4095
4095
4093
4095
0000
0000
4093
4095
0000
0000
4095
4095
0000
0000
……
……
只有第一组数据是正确的（低高），此后数据都是相反的（高低），怎么回事？ |
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发表于 2014-2-23 01:06:30
楼主
