Hi All,
I have perused the archives about this pesky timed mica2 sleep
problem and have not found
any code snippets or anything of huge benifit.
So I repeat the question:
I am working with Mica2.
I would like to put the mote's CPU to sleep for a set period of time
and then have it
awoken by some timer, not an incomming radio packet.
I have done the power measurements with the use of
HPPowerManagementM and I have not
gotten any successful current readings that show me that the module is
doing anything in
the way of sleeping.
The code from Berkely's study for P-TOSSIM shows us how to set the
mote's CPU to sleep,
but it does not show us how to wake it up with a timer.
I write nesC well, but I am not an experienced embedded programmer
so I am not quite sure
how to program the awake tasks from the schematics.
I hope there is someone out there who can help me with my woes.
The code snippet I am using to put the mote to sleep is at the end
of this email.
Thank you in advance,
Greg
Successful code. thanks to Berkely folks, to put the mote to sleep:
task void gotoSleep() {
cli();
//fires the interupt pin to signal data recording
//This is PIN5 on the connector, use probe to read signal
TOSH_SET_INT1_PIN();
TOSH_CLR_INT1_PIN();
// set the PA_POW to 00h to ensure lowest possible leakage current
call CC1000Control.SetRFPower(0x00);
// power down the radio
call CC1000StdControl.stop();
//call CC1000RadioIntM.StdControl.stop();
//call HPLPowerManagement.adjustPower()
///Code taken from Snooze.nc, this is current code used to
//put the Mica2 into different low power states
// save port state
port[0] = inp(PORTA); nops(8);
port[1] = inp(PORTB); nops(8);
port[2] = inp(PORTC); nops(8);
port[3] = inp(PORTD); nops(8);
port[4] = inp(PORTE); nops(8);
port[5] = inp(DDRA); nops(8);
port[6] = inp(DDRB); nops(8);
port[7] = inp(DDRD); nops(8);
port[8] = inp(DDRE); nops(8);
port[9] = inp(TCCR0); nops(8);
// Disable TC0 interrupt and set timer/counter0
//to be asynchronous from the CPU
// clock with a second external clock (32,768kHz) driving it.
//Prescale to 32 Hz.
cbi(TIMSK, OCIE0); nops(8);
// set minimum power state
// NOTE: this enables pull-ups;
// -may be sensor board dependant
// - (ex: Port C should be lo during sleep, not hi?)
outp(0x00, DDRA); // input
outp(0x01, DDRB); // input
// changed 00 to ff because the impedance was high in the sleep
// state, drawing 8mA for 5 sec before sleeping. Now it immediately
// snoozes.
outp(0xff, DDRC); // input
outp(0x00, DDRD); // input
outp(0x00, DDRE); // input
outp(0xff, PORTA); // enable pull-ups
outp(0xfe, PORTB); // enable pull-ups except for PB0
// changed the value of PORTC from ff to 0 because ff
// sounds the alarm when the mote goes to sleep.
outp(0x00, PORTC); // enable pull-ups
outp(0xff, PORTD); // enable pull-ups
cbi(ADCSRA, ADEN); // disable adc
sbi(ACSR,ACD); // disable analog comparator
//goes into sleep modes
if (sm2 == 1){
sbi(MCUCR, SM2); nops(8);
}
if (sm1 == 1){
sbi(MCUCR, SM1); nops(8);
}
if (sm0 == 1){
sbi(MCUCR, SM0); nops(8);
}
//enable sleep, clocks stop
sbi(MCUCR, SE); nops(8);
//enable interupts (after wakingup - if you do)
sei(); nops(8);
//fires the red LED, and the pin
TOSH_SET_INT1_PIN();
call Leds.redOn();
}
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