CCS/MSP430G2553: MSP430G2553 TOUCH Clock affects counting

Hi,

I'm having a little trouble understanding your question and I'm not familiar with the "RO_PINOSC_TA0_WDTp" method you've referenced. Can you please post a copy of your code so I can review it and see if you may be doing anything incorrectly that could explain this variation?

Best regards,
Caleb Overbay

Hi,

Thanks Reply.
Here is the pivotal code  about RO_PINOSC_TA0_WDTp method.
This code comes from the official demo,I have not changed.
There is a picture, this is my main function.

/////////////////////CODE///////////////////////////////////////////////////////////////////
void iiiTI_CTS_RO_PINOSC_TA0_WDTp_HAL(const struct Sensor *group, unsigned int *counts)
{ 
    uint8_t i;

//** Context Save
//  Status Register: 
//  WDTp: IE1, WDTCTL
//  TIMERA0: TA0CTL, TA0CCTL1
//  Ports: PxSEL, PxSEL2 
    uint8_t contextSaveSR; 
    uint8_t contextSaveIE1;
    uint16_t contextSaveWDTCTL;
    uint16_t contextSaveTA0CTL,contextSaveTA0CCTL1,contextSaveTA0CCR1;
    uint8_t contextSaveSel,contextSaveSel2;

    contextSaveSR = __get_SR_register();
    contextSaveIE1 = IE1;
    contextSaveWDTCTL = WDTCTL;
    contextSaveWDTCTL &= 0x00FF;
    contextSaveWDTCTL |= WDTPW;        
    contextSaveTA0CTL = TA0CTL;
    contextSaveTA0CCTL1 = TA0CCTL1;
    contextSaveTA0CCR1 = TA0CCR1;
    
//** Setup Measurement timer***************************************************
// Choices are TA0,TA1,TB0,TB1,TD0,TD1 these choices are pushed up into the 
// capacitive touch layer.
 
 // Configure and Start Timer
    TA0CTL = TASSEL_3+MC_2;                // TACLK, cont mode
    TA0CCTL1 = CM_3+CCIS_2+CAP;            // Pos&Neg,GND,Cap
    IE1 |= WDTIE;                         // enable WDT interrupt
    for (i = 0; i<(group->numElements); i++)
    {
        // Context Save
        contextSaveSel = *((group->arrayPtr[i])->inputPxselRegister);
        contextSaveSel2 = *((group->arrayPtr[i])->inputPxsel2Register);
	// Configure Ports for relaxation oscillator
	*((group->arrayPtr[i])->inputPxselRegister) &= ~((group->arrayPtr[i])->inputBits);
	*((group->arrayPtr[i])->inputPxsel2Register) |= ((group->arrayPtr[i])->inputBits);
        //**  Setup Gate Timer ********************************************************
	// Set duration of sensor measurment
	WDTCTL = (WDTPW+WDTTMSEL+group->measGateSource+group->accumulationCycles); 
	TA0CTL |= TACLR;                     // Clear Timer_A TAR
        if(group->measGateSource == GATE_WDT_ACLK)
        {
            __bis_SR_register(LPM3_bits+GIE);   // Wait for WDT interrupt
        }
        else
        {
	    __bis_SR_register(LPM0_bits+GIE);   // Wait for WDT interrupt
        }
	TA0CCTL1 ^= CCIS0;                   // Create SW capture of CCR1
	counts[i] = TA0CCR1;                 // Save result
	WDTCTL = WDTPW + WDTHOLD;           // Stop watchdog timer
        // Context Restore
        *((group->arrayPtr[i])->inputPxselRegister) = contextSaveSel;
        *((group->arrayPtr[i])->inputPxsel2Register) = contextSaveSel2;
    }
    // End Sequence
    // Context Restore
    __bis_SR_register(contextSaveSR);   
    if(!(contextSaveSR & GIE))
    {
        __bic_SR_register(GIE);   //        
    }
    IE1 = contextSaveIE1;
    WDTCTL = contextSaveWDTCTL;
    TA0CTL = contextSaveTA0CTL;
    TA0CCTL1 = contextSaveTA0CCTL1;
    TA0CCR1 = contextSaveTA0CCR1;
}

////////////////////////

Best regards,
JackLiu

Hi Jack,

Thanks for providing this code. Again, I'm not familiar with the code you've posted but I'll look through it and see if I can decipher what is happening. Out of curiosity, can you point me to where you found this code?

Additionally, I'd like to point out that if you're creating a new capacitive touch design, TI provides a line of MSP430 devices with our CapTIvate technology. This is much more advanced and has better support than the pin osc technology present in the MSP430G2553. 

Best regards, 
Caleb Overbay

Hi Jack,

Thanks for pointing me in the right direction and I'm glad you were able to solve the issue. Do you have anymore questions regarding this topic?

Best regards,
Caleb Overbay