Part Number:MSP430G2553
Hi!
I'm having an issue with LPM3 in a battery powered application.
We have a remote that sends radio commands with CC1101. There is a "Sleep" function between the "sendings"
and after waking up from LPM3, the remote sends slowly, ruining some time-dependant communication operations.
I checked all the BCS, TIMERA and SR registers, it seems all the same. I tried to set the clock again but the problem won't disappear.
Do you have a clue? Details below.
Thanks in advance,
Mirco
This is the send function
for(ikj=0;ikj<4;ikj++)//Send message n times {
FLUSH_TX sleepII(TWNTH_SEC);
RFSendPacket(txBuffer, tx_length, (char)0); // Send value over RF
sleepII(TWNTH_SEC);
L_SIGN_PORT_OUT ^= L_SIGN;
}This is the "sleepII"
void sleepII(unsigned int time)
{
BCSCTL1 |= DIVA_0; // ACLK/2
BCSCTL3 |= LFXT1S_2; // ACLK = VLO
WDTCTL = WDT_ADLY_1000; // Interval timer
TA0CCR0 = time;
TA0CTL = MC_1+TACLR+TASSEL_1;
TA0CCTL0 &= ~(CAP+CCIFG);
TA0CCTL0 |= CCIE;
Stop_Wait=1;
__bis_SR_register(GIE);
while(Stop_Wait);
// __bis_SR_register(LPM0_bits+GIE);
}this is the part where enters and exits lpm3
while(TLC_Power==LOW)
{
P1DIR = 0xFF; // All P1.x outputs
P1OUT = 0; // All P1.x reset
P2DIR = 0xFF; // All P2.x outputs
P2OUT = 0; // All P2.x reset
ADC10CTL0 &= ~ENC;
ADC10CTL0 &= ~REFON ;
ADC10CTL0 &= ~ADC10ON;
sleep_s(IDLE_DELAY_INFO); //__bis_SR_register(LPM3_bits), sleep_s enters lpm3 mode
sleepII(CENT_SEC);
if (check_button_x(1,2)) // if button pressed, wake up
{
TLC_Power=HIGH; // Power Flag
Deep_sleep_counter=DEEP_SLEEP_DELAY;
//Set_Up_Clock_and_WDT(); // it doesn't remove the problem
go_to_sleep_ok=0;
TLC_Power=HIGH; // Power Flag
Battery_Check_time=25; // Tempo prima del prossimo battery check
}
then we have sleep_s():
void sleep_s(unsigned int time)
{
BCSCTL1 |= DIVA_1; // ACLK/2
BCSCTL3 |= LFXT1S_2; // ACLK = VLO
WDTCTL = WDT_ADLY_1000; // Interval timer
TA0CCR0 = time;
TA0CTL = MC_0+TACLR+TASSEL_1;
TA0CCTL0 &= ~(CAP+CCIFG);
TA0CCTL0 |= CCIE;
__bis_SR_register(LPM3_bits+GIE);
}and TA0 ISR that exits lpm3
#pragma vector = TIMER0_A0_VECTOR
__interrupt void Timer0_A0 (void)
{
TA0CTL &= ~(MC_1);
TA0CCTL0 &= ~(CCIE);
__bic_SR_register_on_exit(LPM3_bits);
// __bic_SR_register_on_exit(LPM3_bits)
Stop=0;
Stop_Wait=0;
}the clock is calibrated with this function
void Set_Up_Clock_and_WDT(void)
{
WDTCTL = WDTPW + WDTHOLD; // Stop WDT
if (CALBC1_1MHZ==0xFF)while(1);// If calibration constant erased do not load, trap CPU!!
DCOCTL = 0; // Select lowest DCOx and MODx settings
BCSCTL1 = CALBC1_1MHZ; // Set DCO to 1MHz
DCOCTL = CALDCO_1MHZ;
BCSCTL3 |= LFXT1S_2; // LFXT1 = VLO
}
