ADC + DMA (8Channels) Aleatory Crash

[gui2]

Posted on March 17, 2015 at 13:23

Hello,

I've an application that need the reading of 8 ADC channels...I had thought use DMA in order to collect a big amount of data and then calc the average.Everything works great! However, sometimes, in an aleatory way, the code crashes! :(Any suspicion?Here is my configuration:#define NSAMPLES    35#define NUM_CHANNELS    8#define DMA_BUFFER_SIZE (NSAMPLES*NUM_CHANNELS)void ADC_Configuration(void){  ADC_InitTypeDef       ADC_InitStructure;  ADC_CommonInitTypeDef ADC_CommonInitStructure;  DMA_InitTypeDef       DMA_InitStructure;   /* Enable peripheral clocks *************************************************/  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE); NO init params  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);   /* DMA2_Stream0 channel0 configuration **************************************/  DMA_DeInit(DMA2_Stream0);  DMA_InitStructure.DMA_Channel = DMA_Channel_0;  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&(ADC1->DR);  DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)ADC1_Buff;  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;  DMA_InitStructure.DMA_BufferSize = 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_FIFOMode = DMA_FIFOMode_Disable;  DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;  DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;  DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;  DMA_Init(DMA2_Stream0, &DMA_InitStructure);  /* DMA2_Stream0 enable */  DMA_Cmd(DMA2_Stream0, ENABLE);    /* Configure ADC1 Channels pins as analog input ******************************/  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_2  |  GPIO_Pin_3 |  GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 ;  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;  GPIO_Init(GPIOA, &GPIO_InitStructure);    GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_4;  GPIO_Init(GPIOC, &GPIO_InitStructure);     /* ADC Common Init **********************************************************/ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;ADC_CommonInit(&ADC_CommonInitStructure); /* ADC1 Init ****************************************************************/ADC_Cmd(ADC1, DISABLE);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 = NUM_CHANNELS;ADC_InitStructure.ADC_ExternalTrigConv = 0x00;ADC_Init(ADC1, &ADC_InitStructure);  /* Enable ADC1 DMA */ADC_DMACmd(ADC1, ENABLE);ADC_RegularChannelConfig(ADC1, ADC_Channel_3 , 1, ADC_SampleTime_480Cycles);  ADC_RegularChannelConfig(ADC1, ADC_Channel_11, 2, ADC_SampleTime_480Cycles);  ADC_RegularChannelConfig(ADC1, ADC_Channel_2 , 3, ADC_SampleTime_480Cycles); ADC_RegularChannelConfig(ADC1, ADC_Channel_6 , 4, ADC_SampleTime_480Cycles); ADC_RegularChannelConfig(ADC1, ADC_Channel_5 , 5, ADC_SampleTime_480Cycles); ADC_RegularChannelConfig(ADC1, ADC_Channel_4 , 6, ADC_SampleTime_480Cycles);  ADC_RegularChannelConfig(ADC1, ADC_Channel_10, 7, ADC_SampleTime_480Cycles); ADC_RegularChannelConfig(ADC1, ADC_Channel_14, 8, ADC_SampleTime_480Cycles);        /* Enable DMA request after last transfer (Single-ADC mode) */  ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);    ADC_ContinuousModeCmd(ADC1, ENABLE);    /* Enable ADC1 **************************************************************/  ADC_Cmd(ADC1, ENABLE);     Delay_ms(100);    /* Start ADC1 Software Conversion */    ADC_SoftwareStartConv(ADC1);}Thanks in advance!Best regards,--Guilherme

[Tesla DeLorean]

Posted on March 17, 2015 at 16:33

Everything works great! However, sometimes, in an aleatory way, the code crashes! :(

Any suspicion?Random crashes, probably not this code. Check you have adequate stack, and try to provide more information on what a ''crash'' means in this context. Where does the processor go if you stop execution? Is it in the Hard Fault handler?You'll need to get a lot more specific on what happens to understand why it happens.