int main(void) {
// initialize
uint8_t i2cMessageBuf[I2C_MAX_MSG_SIZE];
USI_TWI_Master_Initialise();
// reset the power mgmt register to wake it up
i2cMessageBuf[0] = (uint8_t) 0xD0; // address 0x68, write
i2cMessageBuf[1] = 0x6b; // low x-axis
i2cMessageBuf[2] = 0x00;
USI_TWI_Start_Read_Write(i2cMessageBuf,(uint8_t) 0x03);
long_delay_ms(50);
while (TRUE) {
// construct a command to high-order x value of a 9150 accelerometer
// register 59 = 0x3b; low-order register is 0x3c, then put them
// together
i2cMessageBuf[0] = (uint8_t) 0xD0;
i2cMessageBuf[1] = 0x3b; // high x-axis
//i2cMessageBuf[2] = 0x3c;
// send the message
USI_TWI_Start_Read_Write(i2cMessageBuf,(uint8_t) 0x02);
// wait
long_delay_ms(50);
// read the msg
i2cMessageBuf[0] = 0xD1; // lsb == 1 => read
i2cMessageBuf[1] = 0x3b;
//i2cMessageBuf[2] = 0x3c;
USI_TWI_Start_Read_Write(i2cMessageBuf,(uint8_t) 0x03);
//USI_TWI_Start_Read_Write(i2cMessageBuf,(uint8_t) 0x04);
// turn on LED if not flat on table
// flat on table: high is FA, low is FF
if (i2cMessageBuf[1] != 0xFA) {
DDRB |= 1 << PB3;
PORTB &= ~(1<<PB3);
}
else PORTB |= 1 << PB3;
// wait
long_delay_ms(500);
}
// never reached
return 0;
}
int main(void)
{
// data direction register for port B to output
DDRB |= (1 << LED);
LED_LO;
for (;;) {
LED_XCHG;
long_delay_ms(DELAY_MS);
}
return 42;
}
void standbyTimerDone(uint32_t avgInputVolt) {
if (avgInputVolt > 768) { // high level means NO bat. loading! now we can really go to sleep
// shut down everything
led_fader_disable();
DIGIWRITE_L(PORTB, PIN_LED);
DIGIWRITE_L(PORTB, PIN_AUDIO_TRIGGER); // stop giving signal to audio playback
DIGIWRITE_L(PORTB, ACCEL_PIN_X);
// prepare going to sleep
GIMSK |= (1 << INT0); // enable external interrupt on PB2
// NOTE: only LOW level will wake the MCU up again!
// this does not work somehow:
// MCUCR |= (1 << ISC01) | (1 << ISC00); // The rising edge of INT0 generates an interrupt request.
// MCUCR |= (1 << ISC00); // Any logical change on INT0 generates an interrupt request.
// wdt_disable();
// go to sleep
sleep_enable();
sei();
sleep_bod_disable();
sleep_cpu();
// woken up!
cli();
sleep_disable();
GIMSK &= ~(1 << INT0); // disable external interrupt on PB2
// test LEDs. 2 times blinking means "woken up"
blinkLED(&PORTB, PIN_LED, 50);
long_delay_ms(50);
blinkLED(&PORTB, PIN_LED, 50);
// start LED fading again
startLEDDefaultMode();
shakeEnded(); // reset states
// wake up watch dog
// wdt_enable(WTD_TIME);
} else {
standby_timer_reset(); // try it again
}
// standby_timer_enable();
}