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#include "msp430g2211.h" | |
#define PIEZO BIT6 | |
#define LED1 BIT0 | |
unsigned short lfsr = 0xACE1u; | |
unsigned int getRnd (void); | |
void playSound (void); | |
void playRattle(void); | |
int i=0; | |
int j=0; | |
void main(void) | |
{ | |
WDTCTL = WDTPW + WDTHOLD; // Stop watchdog timer | |
P1DIR |= PIEZO; // P1.5 output | |
CCTL0 = CCIE; // CCR0 interrupt enabled | |
CCR0 = 32767; | |
TACTL = TASSEL_1 + MC_1; // ACLK, upmode | |
DCOCTL = CALDCO_1MHZ; | |
BCSCTL1 = CALBC1_1MHZ; | |
CCTL0 = CCIE; // CCR0 interrupt enabled | |
CCR0 = 50000; | |
TACTL = TASSEL_2 + MC_2; | |
P1OUT = 0x00; | |
unsigned int delay = 5; | |
while(1) | |
{ | |
if (i>delay) | |
{ | |
playRattle(); | |
playSound(); | |
i=0; | |
delay = getRnd() >> 8; // for a resonable amount this "should" be 7 | |
} | |
_BIS_SR(LPM3_bits + GIE); | |
// Enter LPM3 w/ interrupt | |
} | |
} | |
// Timer A0 interrupt service routine | |
#pragma vector=TIMERA0_VECTOR | |
__interrupt void Timer_A (void) | |
{ | |
i++; | |
_BIC_SR_IRQ(LPM3_bits); | |
} | |
unsigned int getRnd () { | |
lfsr = (lfsr >> 1) ^ (-(lfsr & 1u) & 0xB400u); | |
return lfsr; | |
} | |
void playRattle(void) { | |
for ( j = 0; j < 25; j++) { | |
P1OUT ^= PIEZO; // Toggle P1.5 | |
long z = 1300; // Delay | |
do (z--); | |
while (z != 0); | |
P1OUT ^= PIEZO; | |
} | |
} | |
void playSound(void) { | |
for ( j = 0; j < 8000; j++) { | |
P1OUT ^= PIEZO; // Toggle P1.5 | |
long z = 3; // Delay | |
do (z--); | |
while (z != 0); | |
P1OUT ^= PIEZO; | |
} | |
} | |
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