FLASH and RAM difference for Example_2806xLaunchPad

update:

While in RAM config and run/debug

If I pause the process and reload, it works fine

if I put a breakpint just before

   referenceTemp = sampleTemperature();

and reload then run, it works fine

if I put a large delay before the first      referenceTemp = sampleTemperature();  or if I let it run without stop

it will not work (it gives large ref false : referenceTemp int -260 0x00BE3D@Program.)

puzzling...

Hi Lotfi,

Does the temperature get sampled continuously in a loop?  If so, does the temperature eventually converge on a reasonable value, or does it always stay bad if you don't add a breakpoint?  The ADC needs about 1ms to power-up after it is enabled, I wonder if the function that does this in the InitAdc() function is not getting correctly linked.  The delay function is called DELAY_US().  You could try adding a delay loop before at the point where you are setting a breakpoint to see if this helps.

Dear Devin

It is the (only) example given for the Launchpad XL 28069M 

   EALLOW;
   AdcRegs.ADCCTL2.bit.ADCNONOVERLAP = 1;	//Enable non-overlap mode
   AdcRegs.ADCCTL1.bit.TEMPCONV  = 1; 		//Connect channel A5 internally to the temperature sensor
   AdcRegs.ADCSOC0CTL.bit.CHSEL  = 5; 		//Set SOC0 channel select to ADCINA5
   AdcRegs.ADCSOC0CTL.bit.ACQPS  = 25; 		//Set SOC0 acquisition period to 26 ADCCLK
   AdcRegs.INTSEL1N2.bit.INT1SEL = 0; 		//Connect ADCINT1 to EOC0
   AdcRegs.INTSEL1N2.bit.INT1E  =  1; 		//Enable ADCINT1

...

the sampling is in a loop

    //Main program loop - continually sample temperature
    for(;;) {
        

        //Convert the raw temperature sensor measurement into temperature
        currentTemp = sampleTemperature();
        
        updateTemperature();
        
        DELAY_US(1000000);
        
    }

with :

int16_t sampleTemperature(void)
{
	int16_t temp;

    //Force start of conversion on SOC0
    AdcRegs.ADCSOCFRC1.all = 0x01;

    //Wait for end of conversion.
    while(AdcRegs.ADCINTFLG.bit.ADCINT1 == 0){}  //Wait for ADCINT1
    AdcRegs.ADCINTFLGCLR.bit.ADCINT1 = 1;        //Clear ADCINT1

    //Get temp sensor sample result from SOC0
    temp = AdcResult.ADCRESULT0;

    //Convert the raw temperature sensor measurement into temperature
    return(GetTemperatureC(temp));

}

the temperature is ok, I am talking about the beginning of the programm, it samples a "reference temperature"

I already put lot of delay but without success, the only way  (when starting in RAM) to obtain a good reference temp is to put a break point before the initial sampling

this is curious

There are a couple ways we can go in the debug of this. One thing that would be interesting to see would be the raw ADC conversion result. Your temperature delta appears to be really high in a positive direction, so I think that means the first ADC reading is very low. Adding a breakpoint seems to indicate that there is some type of timing issue with reading the sample, but placing it before initial sampling is not where I would expect it to help.
There are also quite a few other examples that will run on this launchpad HW. You can find them in ControlSUITE in ..\controlSUITE\device_support\f2806x\v150\F2806x_examples_ccsv5. One of these is actually a temperature sensor example, adc_temp_sensor_conv, which you could also try out.