Reading ADC value debugging

[Anonymous]

Hi,

Trying to read ADC values, utilizing the debug function.  But it seems , that I cannot use the add watch button, to read the value from the variable.

I am using PSoC 5LP CY8C5888LT*LP097.

The Code:

include "project.h"

int main(void)

{

    // CyGlobalIntEnable; /* Enable global interrupts. */

    IDAC8_1_Start();

    IDAC8_1_SetPolarity(IDAC8_1_SINK);

    ADC_DelSig_1_Start();

    ADC_DelSig_1_StartConvert();

int8 output;

    /* Place your initialization/startup code here (e.g. MyInst_Start()) */

    for(;;)

    {

      if(ADC_DelSig_1_IsEndConversion(ADC_DelSig_1_RETURN_STATUS))

    {

        output = ADC_DelSig_1_GetResult8();

    }

  //IDAC8_1_SetValue(75);

        /* Place your application code here. */

    }

}

[BragadeeshV]

Hi Tamas,

Declare the variable 'output' as a global variable.

Regards,

Bragadeesh

[Anonymous]

Hi Bragadeesh,

How should I do that?

[BragadeeshV · Accepted solution]

You need to just declare the variable above the main()

Eg:

int8 output;

main()

{

Your application

}

Regards,

Bragadeesh

[Anonymous]

Hi again,

I can now add the watchpoint. But unfortunately it does not show the correct input values - from the voltage supply.   From the watch point  I get a value of -37, the reference supply from the psoc is 4.7V.

Below ADC configuration.

[BragadeeshV]

Hi Tamas,

If you are not expecting any signed numbers for the variable (negative values), declare it as unsigned integer.

Eg: uint8 output

Regards,

Bragadeesh

[Anonymous]

Hi Bragadeesh,

Better results now. Though, at 1V i am getting a value of 214 ((4.7V/1023)*214 = 0.98V) and at 4V I am getting 96 ((4.7V/1023)*96 = 0.45V). I have no idea why - is because i am using ADC_DelSig_1_GetResult32() at a 10 bit ADC?

[Anonymous]

I found the mistake, I was using uint8.