CCS/TMS320F28377D: 28377 adc to dma configure

Hi,

Hope you have referred the examples at \C2000Ware_X_XX_XX_XX\driverlib\f2837xd\examples\cpu1\adc

or ADC examples at \C2000Ware_X_XX_XX_XX\device_support\f2837xd\examples\cpu1

Thanks,

Katta

Yes, I have referred the example.

C:\ti\C2000Ware_2_00_00_02_Software\device_support\f2837xd\examples\cpu1\adc_soc_continuous_dma

Below is my adTask Code. Please help to check where is the problem.

If I comment the four red lines code, adcISR only trigger onetime, and I can get ADC value.

But if I uncomment the four red lines, adcISR can retrigger, the data is zero, and dmaISR only trigger once.

Uint16 AdcaResults[40];
#pragma CODE_SECTION(AdcaResults, ".TI.ramfunc");
void adca1ISR(void)
{
AdcaResults[0] = AdcaResultRegs.ADCRESULT0;
AdcaResults[1] = AdcaResultRegs.ADCRESULT1;
AdcaResults[2] = AdcaResultRegs.ADCRESULT2;
AdcaResults[3] = AdcaResultRegs.ADCRESULT3;
AdcaResults[4] = AdcaResultRegs.ADCRESULT4;
PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
}

void dma1ISR(void)
{
EALLOW;
// Clear any spurious flags:
DmaRegs.CH1.CONTROL.bit.PERINTCLR = 1; // Clear any spurious interrupt flags
DmaRegs.CH1.CONTROL.bit.ERRCLR = 1; // Clear any spurious sync error flags
DmaRegs.CH1.CONTROL.bit.RUNSTS = 1;
EDIS;

PieCtrlRegs.PIEACK.all = PIEACK_GROUP7;
}

void ConfigureADC(void)
{
EALLOW;
AdcaRegs.ADCCTL2.bit.PRESCALE = 6; //set ADCCLK divider to /4
AdcSetMode(ADC_ADCA, ADC_RESOLUTION_12BIT, ADC_SIGNALMODE_SINGLE);
AdcaRegs.ADCCTL1.bit.INTPULSEPOS = 1; //set adc interrupt after transfer finish
AdcaRegs.ADCCTL1.bit.ADCPWDNZ = 1;
delay(1000);
EDIS;
}

//setup the ADC to continuously convert on one channel
void SetupADCContinuous(void)
{
Uint16 acqps;

//determine minimum acquisition window (in SYSCLKS) based on resolution
if(ADC_RESOLUTION_12BIT == AdcaRegs.ADCCTL2.bit.RESOLUTION){
acqps = 14; //75ns
}
else { //resolution is 16-bit
acqps = 63; //320ns
}

EALLOW;
AdcaRegs.ADCSOC0CTL.bit.CHSEL = 0; //SOC will convert on channel
AdcaRegs.ADCSOC1CTL.bit.CHSEL = 1; //SOC will convert on channel
AdcaRegs.ADCSOC2CTL.bit.CHSEL = 2; //SOC will convert on channel
AdcaRegs.ADCSOC3CTL.bit.CHSEL = 3; //SOC will convert on channel
AdcaRegs.ADCSOC0CTL.bit.ACQPS = acqps; //sample window is acqps + 1 SYSCLK cycles
AdcaRegs.ADCSOC1CTL.bit.ACQPS = acqps; //sample window is acqps + 1 SYSCLK cycles
AdcaRegs.ADCSOC2CTL.bit.ACQPS = acqps; //sample window is acqps + 1 SYSCLK cycles
AdcaRegs.ADCSOC3CTL.bit.ACQPS = acqps; //sample window is acqps + 1 SYSCLK cycles
AdcaRegs.ADCINTSEL1N2.bit.INT1CONT = 1; //ADCINT1 pulses are generated whenever an EOC pulse is generated irrespective of whether the flag bit is cleared or not
AdcaRegs.ADCINTSEL1N2.bit.INT1SEL = 3; //end of SOC3 will set INT1 flag
AdcaRegs.ADCINTSEL1N2.bit.INT1E = 1; //Enable INT1 flag
AdcaRegs.ADCINTFLGCLR.bit.ADCINT1 = 1; //Make sure INT1 flag is cleared
AdcaRegs.ADCINTSOCSEL1.bit.SOC0 = 1;
AdcaRegs.ADCINTSOCSEL1.bit.SOC1 = 1;
AdcaRegs.ADCINTSOCSEL1.bit.SOC2 = 1;
AdcaRegs.ADCINTSOCSEL1.bit.SOC3 = 1;
EDIS;
}

void adcTaskInit(void)
{
Hwi_Params hwiParams;
Hwi_Handle dma1Hwi;
Error_Block eb;

Error_init(&eb);
Hwi_Params_init(&hwiParams);

Hwi_Handle adcaHwi;
adcaHwi = Hwi_create(32, adca1ISR, &hwiParams, &eb);
if(adcaHwi == NULL)
System_abort("Hwi create failed");
dma1Hwi = Hwi_create(80, dma1ISR, &hwiParams, &eb);
if(dma1Hwi == NULL)
System_abort("Hwi create failed");

//Configure the ADC and power it up
ConfigureADC();

//Setup the ADC for continuous conversions on channel 0
SetupADCContinuous();

//Initialize results buffer
memset(AdcaResults,0,40);
Hwi_enableInterrupt(32);
Hwi_enableInterrupt(80);
}

void DMAInit(void)
{
DMAInitialize();
DMACH1AddrConfig(AdcaResults, &AdcaResultRegs.ADCRESULT0);
DMACH1BurstConfig(3, 1, 1);
DMACH1TransferConfig(9, -3, 1);
DMACH1WrapConfig(100,1,100,1);
DMACH1ModeConfig(
DMA_ADCAINT1,
PERINT_ENABLE,
ONESHOT_DISABLE,
CONT_DISABLE,
//CONT_ENABLE,
SYNC_DISABLE,
SYNC_SRC,
OVRFLOW_DISABLE,
//THIRTYTWO_BIT,
SIXTEEN_BIT,
CHINT_END,
CHINT_ENABLE
);
}

void adcTaskFxn(void)
{
adcTaskInit();
DMAInit();
StartDMACH1();
AdcaRegs.ADCSOCFRC1.all = 0x000F;
}

Is the data zero in the ADCRESULT registers or is it just zero in the DMA destination buffer because the transfer isn't triggering? I'm trying to figure out which part is broken--the ADC conversion or the DMA transfer. Can you clarify? If you comment out all the DMA code, does the ADC work as expected?

.TI.ramfunc is meant for functions that need to be executed out of RAM, so it's a little odd to put AdcaResults there. I'm not sure this will necessarily be a problem as long as it's in a memory region accessible by the DMA, but it's something to look out for.

Whitney

It seems ADC and DMA both are abnormal.

First, about ADC. I exclude DMA from my task.

condition 1. uncomment the four red line, adcaISR entered periodly, I get data to AdcaResults, and the data value is zero. it is abnormal.

void adca1ISR(void)
{
AdcaResults[0] = AdcaResultRegs.ADCRESULT0;
AdcaResults[1] = AdcaResultRegs.ADCRESULT1;
AdcaResults[2] = AdcaResultRegs.ADCRESULT2;
AdcaResults[3] = AdcaResultRegs.ADCRESULT3;
AdcaResults[4] = AdcaResultRegs.ADCRESULT4;
PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
}.

condition 2. comment the four red line, adcaISR entered only one time. and the data is correct. It seems the first time ADC conversion is worked.

Sencondly, about DMA.

I include DMA into my task, based on the above condition 1, dmaISR only entered one time, why DMA only trigerred once? Pls help to check the DMA configuration.

Thanks.