Hi friends,
I would like to know how exactly to verify that the system has entered the LPM4.5 mode. The following is my code where I try to enter the LPM4.5 mode and then come out of it using a switch-press, which is indicated by a simple counter on LEDs.
I have followed the exact pattern to be written in the PMM registers for entry into LPM4.5, but am NOT able to see the LOCKLPM5 getting set automatically..
Please suggest where I have went wrong?
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// Operating Mode here = LPM4.5 (Attempted.. Not working :-()
#include "msp430fr5739.h"
extern void SystemInit(void);
extern void debouncetimer(void);
volatile unsigned int i;
void main( void )
{
// Stop watchdog timer to prevent time out reset
WDTCTL = WDTPW + WDTHOLD;
SystemInit();
P3OUT = 0xF0; // Initial pattern in LEDs - '1111'
while (1)
{
// !!!!!! HOW TO ENTER LPM4.5???????? !!!!!!
PMMCTL0_H = PMMPW_H; // open PMM
PM5CTL0 &= ~(LOCKLPM5);
PMMCTL0_L |= PMMREGOFF; // set Flag to enter LPM4.5 with LPM4 request
PMMCTL0_H = 0x00; // Close PMM
__bis_SR_register(GIE + CPUOFF + OSCOFF + SCG1 + SCG0); // Enter LPM4.5 by setting PMMREGOFF w/interrupt
}
}
// Simple Counter on LED as per vibrations...
#pragma vector=PORT4_VECTOR
__interrupt void Port_4 (void) {
// disable switches
P4IFG = 0; // P4 IFG cleared
P4IE &= ~(BIT0); // P4.0 interrupt disabled
debouncetimer();
i = 1;
PM5CTL0 &= ~(LOCKLPM5);
P3OUT += 0x10; // Counter on LEDs on Switch Press, whenever system comes out of LPM4.5
}
#pragma vector = TIMER1_A0_VECTOR
__interrupt void Timer1_A0_ISR(void)
{
TA1CCTL0 = 0;
TA1CTL = 0;
// enable switches
P4IFG = 0; // P4 IFG cleared
P4IE = (BIT0); // P4.0 interrupt enabled
}
void SystemInit(void)
{
CSCTL0_H = 0xA5; // Unlock register
CSCTL2 = SELA_1 + SELS_1 + SELM_1; // set ACLK = VLO; MCLK = VLO
CSCTL0_H = 0x01; // Lock Register
//CSCTL1 |= DCOFSEL0 + DCOFSEL1; // Set max. DCO setting
//CSCTL2 = SELA_1 + SELS_3 + SELM_3; // set ACLK = vlo; MCLK = DCO
//CSCTL3 = DIVA_0 + DIVS_0 + DIVM_0; // set all dividers
// Turn off temp.
REFCTL0 |= REFTCOFF;
REFCTL0 &= ~REFON;
// Enable switches
// P4.0 configured as switch
P4OUT |= BIT0; // Configure pullup resistor
P4DIR &= ~(BIT0); // Direction = input
P4REN |= BIT0; // Enable pullup resistor
P4IES |= (BIT0); // P4.0 High to Low edge interrupt
P4IE = BIT0; // P4.0 interrupt enabled
P4IFG = 0; // P4 IFG cleared
//
// more code here to configure all pins as Inputs and Pulling them up.
//
}
void debouncetimer(void)
{
TA1CCTL0 = CCIE; // TACCR0 interrupt enabled
TA1CCR0 = 1500;
TA1CTL = TASSEL_1 + MC_1; // ACLK, up mode
}
