MSP430L092: TEMPERATURE SENSOR DELAYING PROBLEM

This code is an example for MSP430L092 microcontroller. I just added up the code for LED.

I uses this below code for clock. I intend to combine temperature sensor code part with my different code that contains below code in while(1) loop.

I have tried them with together but it does not work.

What do I need to solve this problem?


TA0CCTL0 = CCIE; // TA0CCR0 interrupt enabled

TA0CCR0 = 10; // Set value for TA0CCR0

TA0CTL = TASSEL_2 + MC_1 + TACLR; // SMCLK, up mode



__bis_SR_register(LPM0_bits + GIE); // Enter LPM0 w/ interrupt: CPU, MCLK are disabled

// ACLK is active, SMCLK is active, and HFOSC is on

TA0CTL = MC_0+TACLR;

Please give me more details about solution.

Hello,

Timing wise, you are not changing MCLK so this application will run slow, thus your delay. In the above code, you will go into LPM0 until your Timer interrupt is raised. Then within your Timer ISR, you need to exit LPM0 in order to continue your code.

Thanks for quick reply. Your solution is changing clock division, isn't it? I tried "CLKDIV0" (A-POOL Prescaler Control Bit: 0*/). It doesn't work.

In my code, If I set up if(DegC>40), P1.4 pin is going to be high later 50 seconds. I think that this example code is not working correctly. My sensor value is increasing second by second. I observed that When time is up I mean that after 50 seconds, my led is blinking 2 times and then it turns on constantly.

Is there another example code to measure built-in temperature sensor value for msp430l092?

I couldn't measure it exactly.

In clock system, I tried to add up below code from example msp430x09x_ta_07 for setting up clock but there is no change. I still suffer from this delay problem. I consider that DegC is increasing second by second so it always increases .

CCSCTL7 = 0; // Clear HF & LF OSC fault
SFRIFG1 = 0; // Clear OFIFG flags

CCSCTL4 = SELS_0 + SELM_0; // Select HFCLK/DCO as the source for SMCLK and MCLK
CCSCTL5 = DIVS_0 + DIVM_0; // Set the Dividers for SMCLK to 1
CCSCTL0_H |= 0xFF; // Lock CCS
/* Lock by writing to upper byte */

I put my whole code. Please help me. I couldn't understand your solution. I just want to blink my LED when DegC is greater than 20 *C but I didn't overcome this problem.


/*
* --/COPYRIGHT--*/
/* Description: ADC Temperature Sample */
/****************************A_POOL ADC Conversion *******************************/
/* */
/* */
/* +----L092---+ */
/* |*1 14 | */
/* | 2 13 | */
/* | 3 12 | */
/* | 4 11 | */
/* | 5 10 | */
/* | 6 9 | */
/* | 7 8 | */
/* +-----------+ */
/* */
/* D.Dang/ D.Archbold/ D.Szmulewicz /F. Chen */
/* Texas Instruments Inc. */
/* Built with IAR Version 5.51.1 and CCS Verison 5.3.00090 */
/*********************************************************************************/

#include <msp430.h>

int Result;
volatile short int DegC;


int main(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop WDT

// Begin Configuration of the A-POOL registers

APCTL = 0; // Clear APCTL register
APIE |= EOCIE; // Enable Interrupt for End of Conversion
APTRIM = REFTSEL;
APVDIV = TMPSEN; // Enable Temperature Sensor
APCNF = CMPON+DBON+CONVON+APREFON+CLKSEL_MCLK; // Configure A-POOL elements, Select MCLK as A-POOL Clock Source
P1DIR |= (BIT4+BIT5+BIT6);


/***************************/
/* Setup CCS */
/* SMCLK = HFCLK/1 ~1MHz */
/***************************/
CCSCTL0 = CCSKEY; // Unlock CCS
while (SFRIFG1 & OFIFG) // Oscillator Flag(s)?
{
CCSCTL7 = 0; // Clear HF & LF OSC fault
SFRIFG1 = 0; // Clear OFIFG flags
}
CCSCTL4 = SELS_0 + SELM_0; // Select HFCLK/DCO as the source for SMCLK and MCLK
CCSCTL5 = DIVS_0 + DIVM_0; // Set the Dividers for SMCLK to 1
CCSCTL0_H |= 0xFF; // Lock CCS
/* Lock by writing to upper byte */
while(1)
{

APCTL = OSEL+ODEN+OSWP+APPSEL_4+APNSEL_5; // Set Channels and Start Conversion--+ODEN+
APINT = 0x00; // Clear ADC-DAC-REG
APIFG = 0;
APCTL |= CBSTP+SBSTP+RUNSTOP;
__bis_SR_register(LPM0_bits + GIE); // Enter LPM0 w/ interrupts enabled

Result = APINT;
DegC =(((Result-179)*125)/58) + 30; // Refer to datasheet for accuracy and offset specs

if(DegC>20){
P1OUT|=BIT4;
}

else{
P1OUT&=~BIT4;

}

__no_operation(); // SET BREAKPOINT HERE

}

}


//A_POOL Interrupt Service Routine
#if defined(__TI_COMPILER_VERSION__) || defined(__IAR_SYSTEMS_ICC__)
#pragma vector=APOOL_VECTOR
__interrupt void A_POOL(void)
#elif defined(__GNUC__)
void __attribute__ ((interrupt(APOOL_VECTOR))) A_POOL (void)
#else
#error Compiler not supported!
#endif
{
APIFG = 0; // Clear Interrupt Flag
__bic_SR_register_on_exit(LPM0_bits); // Exit Active to calculate Temperature


}

I added up the code ( APOMR=CLKDIV_0; ) for clock division APOMR is A-POOL Operation Mode Register but I couldn't solve this problem. Please, can you correct my mistakes?