CC2650: SimpleLink MCU

Do you try ADC example at ?

Thanks sir. Yes, I have used the same code for interfacing temperature sensor.

I am able to get the data from the channel. But, I am getting incorrect values. I have tried the same IC with another controller. It is working good as expected. Readings are obtained. I also verifyied by continuous collecteion of raw data in that testing. But unable to get from CC2650. is my configurations correct?

I am confused by your descriptions. Can you elaborate?

Yes, Sorry. 

I used another MCU(MSP430FR5969) for Temp. sensor interface-> I get correct digital values from a particular channel.

But When I am using with CC2650, I couldn't able to get correct values. So, is my config OK?

I am interfacing in the CC2650_ADC example.

What are the design constraints needed to done while interfacing ADC with Sensor.

What is your temperature sensor?

Temp. Sensor - DS600.

According to DS600 datasheet, CC2650 ADC should be able to read DS600 voltage without problem. Can you specify what your problem is when doinf ADC reading from DS600?

I will specify this in mesage. Can you guide me in this. Because important queries should be posted in thread. 

I couldn’t understand your descriptions.

Hi Sir, Please find my code below and raw data obtained from DS600.

* ======== adcsinglechannel.c ========
*/
/* XDCtools Header files */

#include <xdc/std.h>
#include <xdc/runtime/System.h>

/* BIOS Header files */
#include <ti/sysbios/BIOS.h>
#include <ti/sysbios/knl/Task.h>

/* Driver Header files */
#include <ti/drivers/ADC.h>
#if defined(CC2650DK_7ID) || defined(CC1310DK_7XD)
#include <ti/drivers/PIN.h>
#endif

/* Example/Board Header files */
#include "Board.h"

#define ADC_CONV_MIN_VAL 1200
#define ADC_CONV_MAX_VAL 4095
#define ROOM_TEMP_MIN 2500
#define ROOM_TEMP_MAX 3500
#define ADC_CELCIUS_CONV_CONST 509

/* ADC sample count */
#define ADC_SAMPLE_COUNT (10)

/*Task Specific defines */
#define TASKSTACKSIZE (768)

Task_Struct task0Struct;
Char task0Stack[TASKSTACKSIZE];

/* Pin driver handles */
static PIN_Handle buttonPinHandle;
/* Global memory storage for a PIN_Config table */
static PIN_State buttonPinState;

// Temperature sensor related variables declaration
/* ADC conversion result variables */
uint16_t adcValue1[50]={0};
const float adc_conv_volt_const = 0.293040;
const float adc_cel_conv_const = 6.45;
unsigned long volt = 0;
float cel = 0;
int g_Celsius[50]={0};
/*
* Application button pin configuration table:
* - Buttons interrupts are configured to trigger on falling edge.
*/
PIN_Config buttonPinTable[] = {Board_DIO21 | PIN_GPIO_OUTPUT_EN | PIN_GPIO_HIGH | PIN_PUSHPULL | PIN_DRVSTR_MAX,PIN_TERMINATE};

/*
* ======== taskFxn1 ========
* Open a ADC handle and get a array of sampling results after
* calling several conversions.
*/
Void taskFxn0(void)
{
/*board initialization for ADC Pins*/
Board_initADC();
ADC_Handle adc;
ADC_Params params;
int_fast16_t res;
char currVal = 0;
char i = 0;
//clearing the buffer
for(i = 0; i<50; i++)
{
g_Celsius[i] = 0;
adcValue1[i] = 0;
}

PIN_setOutputValue(buttonPinHandle, Board_DIO21, currVal); // for temperature sensor active
ADC_Params_init(&params);
adc = ADC_open(Board_ADC0, &params);
//adc = ADC_open(CC2650_LAUNCHXL_ADC0, &params);

if (adc == NULL)
{
System_abort("Error initializing ADC channel 1\n");
}
else
{
System_printf("ADC channel 1 initialized\n");
}

for(i = 0; i<50; i++)
{
res = ADC_convert(adc, &adcValue1[i]);
volt = adcValue1[i] * ADC_CONV_MIN_VAL/ADC_CONV_MAX_VAL;
cel = ((volt - ADC_CELCIUS_CONV_CONST)/adc_cel_conv_const);
cel +=2; // 2 Calibration factor with LM35 measurement
cel *= 100; // Multiply by 100 to maintain 2 decimal points when casting to integer
g_Celsius[i] = (int)cel; // Cast down to integer to send over BLE
}
ADC_close(adc);
}

/*
* ======== main ========
*/
int main(void)
{
Task_Params taskParams;

/* Call board init functions */
Board_initGeneral();

buttonPinHandle = PIN_open(&buttonPinState, buttonPinTable);
if(!buttonPinHandle) {
System_abort("Error initializing button pins\n");
}

/* Create tasks */
Task_Params_init(&taskParams);
taskParams.stackSize = TASKSTACKSIZE;
taskParams.stack = &task0Stack;
Task_construct(&task0Struct, (Task_FuncPtr)taskFxn0, &taskParams, NULL);

/* SysMin will only print to the console when you call flush or exit */
System_flush();

BIOS_start();

return (0);
}

Raw data: 

adcValue1 unsigned short[20] 
[0] unsigned short 0 
[1] unsigned short 487 
[2] unsigned short 422 
[3] unsigned short 600 
[4] unsigned short 64 
[5] unsigned short 0 
[6] unsigned short 0 
[7] unsigned short 579
[8] unsigned short 599
[9] unsigned short 417
[10] unsigned short 0 
[11] unsigned short 0 
[12] unsigned short 119 
[13] unsigned short 7 
[14] unsigned short 0 
[15] unsigned short 0 
[16] unsigned short 105
[17] unsigned short 245
[18] unsigned short 429
[19] unsigned short 578
[20] unsigned short 576

Do you get the expected result if you use a voltage source as input instead of the temp sensor? 

I am getting the following values:

adcValue1 unsigned short[20]
[0] unsigned short 3126 
[1] unsigned short 3123 
[2] unsigned short 3125 
[3] unsigned short 3124 
[4] unsigned short 3125 
[5] unsigned short 3125 
[6] unsigned short 3126 
[7] unsigned short 3125 
[8] unsigned short 3124 
[9] unsigned short 3126 
[10] unsigned short 3126
[11] unsigned short 3125
[12] unsigned short 3125
[13] unsigned short 3124
[14] unsigned short 3123
[15] unsigned short 3125
[16] unsigned short 3127
[17] unsigned short 3125
[18] unsigned short 3123
[19] unsigned short 3125
[20] unsigned short 3125

I want to know why the interfacing with temp sensor having the errorred output.

ok, and what was the input? (source and value)

Its 3.3V, when I am using the Launchpad supply voltage to source the analog pin.

Please confirm that you have run 

/* Adjust raw adc values and convert them to microvolts */
ADCBuf_adjustRawValues(handle, completedADCBuffer, ADCBUFFERSIZE,
completedChannel);
ADCBuf_convertAdjustedToMicroVolts(handle, completedChannel,
completedADCBuffer, microVoltBuffer, ADCBUFFERSIZE);

as done in the example? 

I don’t see you print the array value in your code. Please post your exact code in your test.

Sir, I am using the example file:-> adcsinglechannel_CC2650_LAUNCHXL_TI_CC2650F128. I also executed that code by using the Supply voltage(CC2650_LAUNCHXL_ADCVDDS) as channel and Ground supply(CC2650_LAUNCHXL_ADCVSS)

I haven't used the above code. It is under :-> adcbufcontinuous_CC2650_LAUNCHXL_TI_CC2650F128 example file. 

I have checked the array in Expressions for getting those result. @YiKai Chen

You wrote in the first post that you use adcbufcontinuous, now you write that you use adcsinglechannel? 

As YK wrote, please post the code you are using. 

Yes you are right. I have posted the reference to wrong example. But I am using the adcsinglechannel example code and changed that code which I have mentioned earlier. Sorry for not mentioning the wrong example in previous post.

Can you post exact codes that you are testing?

The same code which I have mentioned earlier.

* ======== adcsinglechannel.c ========
*/
/* XDCtools Header files */

#include <xdc/std.h>
#include <xdc/runtime/System.h>

/* BIOS Header files */
#include <ti/sysbios/BIOS.h>
#include <ti/sysbios/knl/Task.h>

/* Driver Header files */
#include <ti/drivers/ADC.h>
#if defined(CC2650DK_7ID) || defined(CC1310DK_7XD)
#include <ti/drivers/PIN.h>
#endif

/* Example/Board Header files */
#include "Board.h"

#define ADC_CONV_MIN_VAL 1200
#define ADC_CONV_MAX_VAL 4095
#define ROOM_TEMP_MIN 2500
#define ROOM_TEMP_MAX 3500
#define ADC_CELCIUS_CONV_CONST 509

/* ADC sample count */
#define ADC_SAMPLE_COUNT (10)

/*Task Specific defines */
#define TASKSTACKSIZE (768)

Task_Struct task0Struct;
Char task0Stack[TASKSTACKSIZE];

/* Pin driver handles */
static PIN_Handle buttonPinHandle;
/* Global memory storage for a PIN_Config table */
static PIN_State buttonPinState;

// Temperature sensor related variables declaration
/* ADC conversion result variables */
uint16_t adcValue1[50]={0};
const float adc_conv_volt_const = 0.293040;
const float adc_cel_conv_const = 6.45;
unsigned long volt = 0;
float cel = 0;
int g_Celsius[50]={0};
/*
* Application button pin configuration table:
* - Buttons interrupts are configured to trigger on falling edge.
*/
PIN_Config buttonPinTable[] = {Board_DIO21 | PIN_GPIO_OUTPUT_EN | PIN_GPIO_HIGH | PIN_PUSHPULL | PIN_DRVSTR_MAX,PIN_TERMINATE};

/*
* ======== taskFxn1 ========
* Open a ADC handle and get a array of sampling results after
* calling several conversions.
*/
Void taskFxn0(void)
{
/*board initialization for ADC Pins*/
Board_initADC();
ADC_Handle adc;
ADC_Params params;
int_fast16_t res;
char currVal = 0;
char i = 0;
//clearing the buffer
for(i = 0; i<50; i++)
{
g_Celsius[i] = 0;
adcValue1[i] = 0;
}

PIN_setOutputValue(buttonPinHandle, Board_DIO21, currVal); // for temperature sensor active
ADC_Params_init(&params);
adc = ADC_open(Board_ADC0, &params);
//adc = ADC_open(CC2650_LAUNCHXL_ADC0, &params);

if (adc == NULL)
{
System_abort("Error initializing ADC channel 1\n");
}
else
{
System_printf("ADC channel 1 initialized\n");
}

for(i = 0; i<50; i++)
{
res = ADC_convert(adc, &adcValue1[i]);
volt = adcValue1[i] * ADC_CONV_MIN_VAL/ADC_CONV_MAX_VAL;
cel = ((volt - ADC_CELCIUS_CONV_CONST)/adc_cel_conv_const);
cel +=2; // 2 Calibration factor with LM35 measurement
cel *= 100; // Multiply by 100 to maintain 2 decimal points when casting to integer
g_Celsius[i] = (int)cel; // Cast down to integer to send over BLE
}
ADC_close(adc);
}

/*
* ======== main ========
*/
int main(void)
{
Task_Params taskParams;

/* Call board init functions */
Board_initGeneral();

buttonPinHandle = PIN_open(&buttonPinState, buttonPinTable);
if(!buttonPinHandle) {
System_abort("Error initializing button pins\n");
}

/* Create tasks */
Task_Params_init(&taskParams);
taskParams.stackSize = TASKSTACKSIZE;
taskParams.stack = &task0Stack;
Task_construct(&task0Struct, (Task_FuncPtr)taskFxn0, &taskParams, NULL);

/* SysMin will only print to the console when you call flush or exit */
System_flush();

BIOS_start();

return (0);
}

Btw, if you use CC2640R2F instead you will get a much more up to date software offering. 

Sir, refer to this link : https://e2e.ti.com/support/wireless-connectivity/bluetooth/f/538/p/404426/1433112#pi320995=1

This link uses driverlib for CC2640 MCU. Is there a driverlib support in CC2650?

ADC of CC2640 and CC2650 are the same so you can use the same code.

Yes, I will try this code and will update you shortly.