adc+dma+can为什么上位机波形不对

董哲 · 发表于 2019-8-4 22:41:03

以下是adc+dma和main里的代码，adc就采一个通道，dma采用双缓冲模式，每次传142个数据，正好一个周波，每次先把dma空闲的那块内存里的量导出来，然后can慢慢发，在上位机上看波形总是乱的，请大神帮忙看一下，多谢。
void Adc_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
ADC_CommonInitTypeDef ADC_CommonInitStructure;
ADC_InitTypeDef ADC_InitStructure;
// NVIC_InitTypeDef NVIC_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);//ê1ÄüGPIOAê±Öó
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE); //ê1ÄüADC1ê±Öó
/*************3õê¼»ˉADC ***********/
//Ïè3õê¼»ˉGPIO0,1,5,7 IO¿ú
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN ;//Ä￡Äaêäèë
//GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;//íÆíìêä3ö
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;//100MHz
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;//2»′øéÏÏÂà-
GPIO_Init(GPIOA, &GPIO_InitStructure);//3õê¼»ˉ
/**************ADC_CommonInit********/
RCC_APB2PeriphResetCmd(RCC_APB2Periph_ADC1,ENABLE); //ADC1¸′Î»
RCC_APB2PeriphResetCmd(RCC_APB2Periph_ADC1,DISABLE); //¸′Î»½áêø
ADC_CommonInitStructure.ADC_Mode =ADC_Mode_Independent;//Ë«í¨μàí¬2½×a»»Ä￡ê½ 1æÔòí¬2½
//ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;//á½¸ö2éÑù½×¶ÎÖ®¼äμÄÑó3ù5¸öÑóê± ¸ÃéèÖÃÖ»Õë¶Ôóú½»ìæ′￥·￠Ä￡ê½
ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_1 ; //DMAÄ￡ê½1
ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div4;//Ô¤·ÖÆμ4·ÖÆμ¡￡ADCCLK=PCLK2/4=84/4=21Mhz,ADCê±Öó×îoÃ2»òa3¬1y36Mhz
ADC_CommonInit(&ADC_CommonInitStructure);//3õê¼»ˉ
/***********ADC13õê¼»ˉ**********/
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;//12Î»Ä￡ê½
ADC_InitStructure.ADC_ScanConvMode = DISABLE;//é¨ÃèÄ￡ê½
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;//¿aÆôá¬DøÄ￡ê½ ÖØ¸′2éÑù
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;//éÏéyÑØ′￥·￠
//ADC_InitStructure.ADC_ExternalTrigConv=ADC_ExternalTrigConv_T2_CC2;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;//óò¶ÔÆë
ADC_InitStructure.ADC_NbrOfConversion = 1;//2¸ö×a»»Ôú1æÔòDòáDÖD
ADC_Init(ADC1, &ADC_InitStructure);//ADC13õê¼»ˉ
ADC_Cmd(ADC1,ENABLE);//ê1ÄüADC
ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_480Cycles ); //ADC1_PA0,ADCí¨μà,480¸öÖüÆú,ìá¸ß2éÑùê±¼ä¿éòÔìá¸ß¾«è·¶è
ADC_DMARequestAfterLastTransferCmd(ADC1,ENABLE);
ADC_DMACmd(ADC1, ENABLE);
ADC_SoftwareStartConv(ADC1);<div class="blockcode"><blockquote>u32 i=0;
void MY_DMA_Config(DMA_Stream_TypeDef *DMA_Streamx,u32 chx,u32 par,u32 mar,u32 mar1,u16 ndtr)
{
DMA_InitTypeDef DMA_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2,ENABLE);
DMA_DeInit(DMA_Streamx);
while (DMA_GetCmdStatus(DMA_Streamx) != DISABLE){}//μè′yDMA¿éÅäÖÃ
/* ÅäÖÃ DMA Stream */
DMA_InitStructure.DMA_Channel = chx; //í¨μàÑ¡Ôñ DMA_Channel_0
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)par;//DMAíaéèμØÖ· ADC12_DR_Address
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)mar;//DMA ′æ′￠Æ÷0μØÖ·
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;//′æ′￠Æ÷μ½íaéèÄ￡ê½
DMA_InitStructure.DMA_BufferSize = ndtr;//êy¾Y′«êäá¿
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//íaéè·ÇÔöá¿Ä￡ê½
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//′æ′￠Æ÷Ôöá¿Ä￡ê½
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;//íaéèêy¾Y3¤¶è:16Î»
DMA_InitStructure.DMA_MemoryDataSize = DMA_PeripheralDataSize_HalfWord;//′æ′￠Æ÷êy¾Y3¤¶è:16Î»
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular ;// ê1óÃÑ-»·Ä￡ê½
DMA_InitStructure.DMA_Priority = DMA_Priority_High;//ÖDμèóÅÏè¼¶
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;//′æ′￠Æ÷í»·￠μ￥′Î′«êä
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;//íaéèí»·￠μ￥′Î′«êä
DMA_DoubleBufferModeConfig(DMA2_Stream0, (uint32_t)mar1, DMA_Memory_0);
DMA_DoubleBufferModeCmd(DMA2_Stream0, ENABLE);
DMA_Init(DMA_Streamx, &DMA_InitStructure);//3õê¼»ˉDMA_Stream0
DMA_Cmd(DMA_Streamx, ENABLE);
//¿aÖD¶Ï
// DMA_ITConfig(DMA2_Stream0,DMA_IT_HTIF0,ENABLE);
NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream0_IRQn;
//ADC1,ADC2è«¾ÖÖD¶Ï
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;
//ÇàÕ¼óÅÏè¼¶ 0
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
//Ïìó|óÅÏè¼¶ 1
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
DMA_ITConfig(DMA2_Stream0,DMA_IT_TC,ENABLE);//′«êäíê3éÖD¶Ï¿ØÖÆÎ»¿aÆô
}
void DMA2_Stream0_IRQHandler(void)
{
if(DMA_GetITStatus(DMA2_Stream0,DMA_IT_TCIF0) != RESET)
{
DMA_ClearITPendingBit(DMA2_Stream0,DMA_IT_TCIF0);//Çå3yÖD¶Ï±êÖ¾Î»
}
}
<div class="blockcode"><blockquote>
__IO uint16_t ADC1_ConvertedValue[142]; //Ã¿Öü2¨2éÑù60¸öμã￡¬2éÑùÂêÎa3KHz
__IO uint16_t ADC1_ConvertedValue1[142];
__IO uint16_t ADC1_ConvertedValueLocal[142];
extern u32 i;
#define ADC_DR_Address ((uint32_t)0x4001204C)
CanRxMsg RxMessage; //½óêÕ»o3åÇø
__IO uint32_t my_flag=0 ; //½óêÕ3é1|±êÖ¾
int main(void)
{
u16 j,k=0;//da_8,j,k;
u8 buff[2],res,s;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//éèÖÃÏμí3ÖD¶ÏóÅÏè¼¶·Ö×é2
delay_init(168); //3õê¼»ˉÑóê±oˉêy
uart_init(115200); //3õê¼»ˉ′®¿ú2¨ìØÂêÎa115200
LED_Init(); //3õê¼»ˉLED
Adc_Init(); //3õê¼»ˉADC
MY_DMA_Config(DMA2_Stream0,DMA_Channel_0,(u32)ADC_DR_Address ,(u32)ADC1_ConvertedValue,(u32)ADC1_ConvertedValue1,142);
//TIM2_Int_Init(999,83);//3õê¼»ˉ′￥·￠Æ÷t=(acc+1)*(psc+1)/Fs; F=1/t=500Hz
CAN_Config();
while (1)
{
if(DMA_GetCurrentMemoryTarget(DMA2_Stream0))
{
for (k=0;k<142;k++)
{
ADC1_ConvertedValueLocal[k]=ADC1_ConvertedValue[k];
}
}
else
{
for (k=0;k<142;k++)
{
ADC1_ConvertedValueLocal[k]=ADC1_ConvertedValue[k];
}
}
for(j=0;j<142;j++)
{
buff[0]= (uint8_t) (ADC1_ConvertedValueLocal[j]&0xff);
buff[1]= (uint8_t) ((ADC1_ConvertedValueLocal[j]>>8)&0xff);
res=CAN1_Send_Msg(buff,2);//CAN·￠Ëí
}
}
}