CCS/CC2640: CC2640 ADC example

Matteo Cresseri

Part Number: CC2640
Other Parts Discussed in Thread: BLE-STACK,

Tool/software: Code Composer Studio

Hi All,

I am trying to use the ADC peripheral (I've tried referring to this example: https://e2e.ti.com/support/wireless_connectivity/bluetooth_low_energy/f/538/p/404426/1433112#pi239031350=1 )

My goal is very easy: enable the adc and perform a single reading of the value before disabling the adc again...

I am using the same pins of the example (DIO_23), but after triggering the adc manually (using the function AUXADCGenManualTrigger();), the code stucks in the AUXADCReadFifo() function. I have tried using this in interrupt (and the interrupts is never raised) and also calling directly the readFifo function... the result is the same: the execution stucks on the instruction:

while (HWREG(AUX_ANAIF_BASE + AUX_ANAIF_O_ADCFIFOSTAT) & AUX_ANAIF_ADCFIFOSTAT_EMPTY_M);

in the AUXADCReadFifo function

It seems that the conversion is never completed. Can you help me to understand if there is any error in my code?

This is an extract of my code: (the interrupt is not enabled because in this case I'm trying to read the fifo directly)

----------------------------------------------------------------------------------------------

the pin is initialized as: "IOID_23| PIN_INPUT_DIS | PIN_GPIO_OUTPUT_DIS"

----------------------------------------------------------------------------------------------

// Enable Interrupt for the ADC
// Hwi_Params hwiParams;
// Hwi_Params_init(&hwiParams);
// hwiParams.enableInt = true;
// Hwi_construct(&hwi, INT_AUX_ADC, adcIsr, &hwiParams, NULL);

Power_setConstraint(Power_SB_DISALLOW); // Disallow STANDBY mode while using ADC

// Enable clock for ADC difital and analog interface (not currently enabled in driver)
AUXWUCClockEnable(AUX_WUC_MODCLKEN0_ANAIF_M | AUX_WUC_MODCLKEN0_AUX_ADI4_M);

AUXADCSelectInput(ADC_COMPB_IN_AUXIO7); // Connect AUX IO7 (DIO_23) as analog input.

AUXADCEnableSync(AUXADC_REF_FIXED, AUXADC_SAMPLE_TIME_2P7_US, AUXADC_TRIGGER_MANUAL); // Set Up ADC

AUXADCGenManualTrigger(); // Trigger the reading

adcSample = AUXADCReadFifo(); // Read the value from the FIFO

AUXADCDisable(); // Disable ADC

Power_releaseConstraint(Power_SB_DISALLOW); // Allow STANDBY mode again

----------------------------------------------------------------------------------------------

Thanks in advance!

Mat

over 7 years ago

0 Christin Lee over 7 years ago

TI__Guru 56045 points

Hi,

The code is made before our ADC driver is in place. Now in our new TI-RTOS there is ADC driver example available. I would recommend you to take a look at it and start from there.

0 Gabohkiin over 7 years ago

Intellectual 325 points

example using IOID_7 pin using the drivers from TI:

const ADCCC26XX_HWAttrs adcCC26xxHWAttrs[1] = {
{
.adcDIO = IOID_7,
.adcCompBInput = ADC_COMPB_IN_AUXIO7,
.refSource = ADCCC26XX_VDDS_REFERENCE,
.samplingDuration = ADCCC26XX_SAMPLING_DURATION_2P7_US,
.inputScalingEnabled = true,
.triggerSource = ADCCC26XX_TRIGGER_MANUAL
},
};

const ADC_Config ADC_config[] = {
{&ADCCC26XX_fxnTable, &adcCC26xxObjects[0], &adcCC26xxHWAttrs[0]},
{NULL, NULL, NULL},
};

int main()
{
...
PIN_init(BoardGpioInitTable);
ADC_init();
...
}

uint16_t measADC(void)
{
ADC_Params params;
ADC_Handle h;
uint16_t adcValue;

ADC_Params_init(&params);
h = ADC_open(0, &params);

ADC_convert(h, &adcValue);

return adcValue;
}

0 Matteo Cresseri over 7 years ago in reply to Gabohkiin

Prodigy 95 points

Hello and thanks for your answers.

Unfortunately I'm working on an already existing project that is based on the BLE-Stack v2.1.0 and uses the TI-ROTS v.2.13... where this driver is not available.
The project is quite huge so it is not possible to port the whole work on the new stack... I think I'll have to go through this old fashioned way.

Is this correct?

So could you please help me in this way?

0 Gabohkiin over 7 years ago in reply to Matteo Cresseri

Intellectual 325 points

From my side, I cannot tell as I'm new to BLE-Stack and TI-RTOS.

0 Christin Lee over 7 years ago in reply to Gabohkiin

TI__Guru 56045 points

Hi,

I am not sure if I followed your post. Do you have problem using the ADC example?

0 Christin Lee over 7 years ago in reply to Matteo Cresseri

TI__Guru 56045 points

Do you mean even when you use the exact code from the post, it still does not work?

0 Matteo Cresseri over 7 years ago in reply to Christin Lee

Prodigy 95 points

Hi,

No, I haven't used the example, but derived the code (that is almost the same) directly in my project... I had to insert a single ADC read in an existing project that uses the BLE-Stack v2.1.0 and uses the TI-ROTS v.2.13.
The code I'm using is the one I've posted.

0 Gabohkiin over 7 years ago in reply to Christin Lee

Intellectual 325 points

Hi Christin, I do not have a problem with ADC, I just posted an example for Matteo, but he requested something using a code in "old fashioned way", which I do not know because I'm relative new using CC2640.

Regards,

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CCS/CC2640: CC2640 ADC example