• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 78 subscribers
  • Views 1084 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

MSP430FR2533: Touch calibration for thick sticker

Pallav Gandhi
Intellectual 900 points
Part Number: MSP430FR2533

Hi all,

I am using MSP430FR2533 for touch sensing. I have found when i programmed it with captivate design centre it worked fine without any acrylic on it.

Now i placed one acrylic sheet on it of 4mm. Now the same can not sense the touch. I did following changes in "CAPT_UserConfig.c" and it started sensing. Please suggest is this the right way to do it??

Previous:

tButtonSensorParams Touch_Params;
tSensor Touch =
{
    // Basic Properties
    .TypeOfSensor = eButtonGroup,
    .SensingMethod = eSelf,
    .DirectionOfInterest = eDOIDown,
    .pvCallback = NULL,
    .ui8NrOfCycles = 4,
    .pCycle = Touch_Cycles,
    .pSensorParams = (tGenericSensorParams*)&Touch_Params,
    // Conversion Control Parameters
    .ui16ConversionCount = 500,
    .ui16ConversionGain = 200,
    .ui8FreqDiv = 2,
    .ui8ChargeLength = 0,
    .ui8TransferLength = 0,
    .bModEnable = false,
    .ui8BiasControl = 3,
    .bCsDischarge = true,
    .bLpmControl = false,
    .ui8InputSyncControl = 0,
    .bTimerSyncControl = false,
    .bIdleState = true,
    // Tuning  Parameters
    .ui16ProxThreshold = 10,
    .ui16NegativeTouchThreshold = 20,
    .ui16ErrorThreshold = 8191,
    .ui16TimeoutThreshold = 1000,
    .ProxDbThreshold.DbIn = 1,
    .ProxDbThreshold.DbOut = 0,
    .TouchDbThreshold.DbIn = 1,
    .TouchDbThreshold.DbOut = 0,
    .bCountFilterEnable = true,
    .ui8CntBeta = 1,
    .bSensorHalt = false,
    .bPTSensorHalt = true,
    .bPTElementHalt = true,
    .ui8LTABeta = 7,
    .bReCalibrateEnable = true,
};

Now changed to :

tButtonSensorParams Touch_Params;
tSensor Touch =
{
    // Basic Properties
    .TypeOfSensor = eButtonGroup,
    .SensingMethod = eSelf,
    .DirectionOfInterest = eDOIDown,
    .pvCallback = NULL,
    .ui8NrOfCycles = 4,
    .pCycle = Touch_Cycles,
    .pSensorParams = (tGenericSensorParams*)&Touch_Params,
    // Conversion Control Parameters
    .ui16ConversionCount = 750,
    .ui16ConversionGain = 100,
    .ui8FreqDiv = 2,
    .ui8ChargeLength = 0,
    .ui8TransferLength = 0,
    .bModEnable = false,
    .ui8BiasControl = 3,
    .bCsDischarge = true,
    .bLpmControl = false,
    .ui8InputSyncControl = 0,
    .bTimerSyncControl = false,
    .bIdleState = true,
    // Tuning  Parameters
    .ui16ProxThreshold = 10,
    .ui16NegativeTouchThreshold = 20,
    .ui16ErrorThreshold = 8191,
    .ui16TimeoutThreshold = 1000,
    .ProxDbThreshold.DbIn = 1,
    .ProxDbThreshold.DbOut = 0,
    .TouchDbThreshold.DbIn = 1,
    .TouchDbThreshold.DbOut = 0,
    .bCountFilterEnable = true,
    .ui8CntBeta = 1,
    .bSensorHalt = false,
    .bPTSensorHalt = true,
    .bPTElementHalt = true,
    .ui8LTABeta = 7,
    .bReCalibrateEnable = true,
};

Changes are marked in red. Please suggest.

Regards.

  • 0
    TI__Guru**** 202856 points
    Hi Pallav,

    You should generate new source code inside of the Design Center Studio's MSP430 Controller properties once you have tuned the Button Sensor parameters to your liking, according to the Channel Data feedback provided inside of the sensor properties. You would then re-program the device through CCS to have the changes take place by default on reset/power-on. This is the typical process for calibrating CapTIvate designs.

    Regards,
    Ryan
  • 0 in reply to Ryan Brown1
    Intellectual 900 points
    Hi Ryan,

    Thanks for the suggestion but i want to calibrate my own PCB ,which does not have communication available so that i can connect the same with Captivate design centre file.

    So the issue remais same for calibration. And i did it manually as shown above. Do you have any other idea for the same?

    Regards.
  • 0 in reply to Pallav Gandhi
    TI__Guru**** 202856 points
    Hi Pallav,

    You do not have any I2C or UART interface available with the MSP430FR2533? There is nothing wrong with the manual calibration you've done except that it will become very difficult to tune the sensors to your desired specifications.

    Regards,
    Ryan

**Attention** This is a public forum