cc3200 ADC data from DMA

Hi,

I am working on TI cc3200.

In general , we could able to access the 4096 ADC samples form FIFO. 

I want to access the ADC data from DMA by enabling the ADC DMA.

We have API's such as :-

ADCIntEnable (unsigned long ulBase, unsigned long ulChannel, unsigned long ulIntFlags);

ADCIntRegister (unsigned long ulBase, unsigned long ulChannel, void(*)(void) pfnHandler);

But , I couldn't able to implement them in my code.

Kindly, requesting for help 

Regards,

Sourabh.

Hi Sourabh,

In the thread below i have put code snippet you can use to setup DMA along with ADC. Note that here DMA is set in Ping-Pong mode.
e2e.ti.com/.../408687

Thanks and Regards,
Siddaram

Hi Siddaram,
Thanks for the reply !!!

I need to access the ADC samples using DMA in basic mode.
I tried by enabling the DMA on ADC , and then reading FIFO data , but its giving some garbage values , Timestamp has totally gone bad.

If you have sample code for it, will be very helpful.

Regards,
Sourabh.

Hi Sourabh,

I have setup ADC in DMA BASIC_MODE using the code below, It works fine.
Note that i have removed the comments from code below just to make it compact.This code is based on adc example in SDK.

unsigned long      DmaDataDump[640];
void ADCIntHandler(void)
{
  unsigned short Status,i;
  ADCDMADisable(ADC_BASE, ADC_CH_2);  
  Status = ADCIntStatus(ADC_BASE, ADC_CH_2);
  ADCIntClear(ADC_BASE, ADC_CH_2,Status|ADC_DMA_DONE);
  for(i=0;i<640;i++)
  UART_PRINT("\n\rVoltage in mV is %d\n\r",((((DmaDataDump[i] >> 2 ) & 0x0FFF))*1400)/4096);   
  UDMASetupTransfer(UDMA_CH16_ADC_CH2, UDMA_MODE_BASIC, 640, UDMA_SIZE_32, UDMA_ARB_1, 
                    (void *)(0x4402E874+ADC_CH_2), UDMA_SRC_INC_NONE, (void *)&(DmaDataDump[0]), UDMA_DST_INC_32);
  ADCDMAEnable(ADC_BASE, ADC_CH_2);
}
  
void InitAdcDma( void )
{
  unsigned short Status;
  UDMAInit();
  PinTypeADC(PIN_59,0xFF);
  MAP_uDMAChannelAssign(UDMA_CH16_ADC_CH2);
  UDMASetupTransfer(UDMA_CH16_ADC_CH2, UDMA_MODE_BASIC, 640, UDMA_SIZE_32, UDMA_ARB_1, 
                    (void *)(0x4402E874+ADC_CH_2), UDMA_SRC_INC_NONE, (void *)&(DmaDataDump[0]), UDMA_DST_INC_32);
  ADCDMAEnable(ADC_BASE, ADC_CH_2);
  ADCIntRegister(ADC_BASE, ADC_CH_2,ADCIntHandler);
  Status = ADCIntStatus(ADC_BASE, ADC_CH_2);
  ADCIntClear(ADC_BASE, ADC_CH_2,Status|ADC_DMA_DONE);
  ADCIntEnable(ADC_BASE, ADC_CH_2,ADC_DMA_DONE);
  ADCChannelEnable(ADC_BASE, ADC_CH_2);
  ADCEnable(ADC_BASE);
  while(1);
}

Thanks and Regards,

Siddaram

Hi Sourabh,

Did your queries got answered. If yes please press the "Verify Answer" button to close this thread.

Thanks and Regards,
Siddaram

Hi Sourabh,

I am closing this thread, if the issue still exists please open a new thread and add a link to this one for reference

Thanks and Regards,
Siddaram

Hi Siddaram,

I'm also dealing with ADC by employing DMA Controller.

I used the structure that you've mentioned above, however even though the retrieved sample contains actual data part [13:2], It does have a timestamp part ( actually, [31:14] is completely empty.

I've tried to enable ADC timer by calling  ADCTimerConfig & ADCTimerEnable methods but nothing is changed.

What could be the reason of this issue?

Btw this is the setup params of my dma:

	//fifo register offset
	// ADC_O_channel0FIFODATA + ADC_CH_2
	// pvSrcBuf : base addr + fifo register offset
	UDMASetupTransfer(UDMA_CH16_ADC_CH2,
			UDMA_MODE_BASIC,
			1,
			UDMA_SIZE_32,
			UDMA_ARB_1,
			(void *)(ADC_BASE + ADC_O_channel0FIFODATA + ADC_CH_2),//(void *)(0x4402E874 + ADC_CH_2),
			UDMA_SRC_INC_NONE,
			(void *)&(DmaDataDump[0]),
			UDMA_DST_INC_32);