MSP430FR5972: CLOCK_TIMER

Hello Himanshu,

One option would be to change the function of the pin from TAx.x to GPIO when you want to set the output to low or high, and vice versa when you would like to toggle the pins periodically.

For example, this code would set the pin high:

P1SEL0 &= ~BIT6       \\Set both selection pins to zero for GPIO out
P1SEL1 &= ~BIT6
P1OUT |= BIT6          \\Set pin high

And this code would set the pin to the timer function:

P1SEL0 |= BIT6       \\Set selection pins to 11 for TA0.1
P1SEL1 |= BIT6

In order to set the timer so that the pins toggle high or low without an ISR or delay cycles you need to tie the LED directly to the capture compare register (CCRx). This is done by selecting the TAx.x function using the function select pins and then choose the output mode for the pin that best suits your needs.

This example code shows how to set up the timer to output a PWM of different periods and duty cycles without any interrupts. In this example code, the CCR0 determines the period of the PWM signal, and the relation between CCR1/CCR2 and CCR0 determines the duty cycle.

 Alternatively, you could only use CCR0 and use TA0CCTL0 = OUTMOD_4 to have the pin toggle every time the timer counts up to the CCR0 value.

For example, the following code will toggle the output on pin 1.5 every 100 clock cycles:

TA0CCR0 = 100-1; \\timer will roll over every 100 clock cycles
TA0CCTL0 = OUTMOD_4; \\Toggle
TA0CTL = TASSEL_ACLK | MC__up | TACLR; \\ ACLK, up mode, clear TAR

Please let me know if this does not answer your question or you have more questions.

Regards,

Matthew

Thank You Matthew for your reply. My requirement is set the pin to the timer function.I am able to understand with example how to workout this but still I am failed to toggle LED.

LED is connected to PIN P1.2/TA1.1/TA0CLK/COUT/A2/C2 and setting which I am using in my code is :



// Clock System Setup
CSCTL0_H = CSKEY >> 8; // Unlock CS registers
CSCTL1 = DCOFSEL_4 | DCORSEL; // Set DCO to 16MHz
CSCTL2 = SELA__VLOCLK | SELS__DCOCLK | SELM__DCOCLK; // Set SMCLK = MCLK = DCO,
// ACLK = VLOCLK
CSCTL3 = DIVA__1 | DIVS__1 | DIVM__1; // Set all dividers
CSCTL0_H = 0; // Lock CS registersM

P1SEL0 |= BIT2; //Set selection pins to 11 for TA0.1
P1SEL1 |= BIT2;
TA1CCR0 = 1000-1; //timer will roll over every 100 clock cycles
TA1CCTL1 = OUTMOD_4; //Toggle
TA1CCR1 = 750; // CCR1 PWM duty cycle
TA1CTL = TASSEL_1 | MC_1 | TACLR; // ACLK, up mode, clear TAR

Please tell whether these above settings are right or wrong.
Thanks in advance.

Hi Matthew,

I totally agree with you Answer.Here is the code I am using Now.Still I am failed to toggle the LED.

P1SEL0  |= BIT2;

P1SEL1 &= ~BIT2;

P1DIR |=BIT2;

TA1CCR0 = 100-1; //timer will roll over every 100 clock cycles

TA1CCTL1 = OUTMOD_4; //Toggle
TA1CTL = TASSEL_1 | MC_1 | TACLR; // ACLK, up mode, clear TAR

Hello Himanshu,

Do you have any updates on this issue?

Regards,
Matthew