i tried to test the sleep mode on Leonardo. But after upload the sketch, the Led is always on. And i can't upload other sketch anymore,the devices is always unknown. I have tried other board, i still can distinguish the device for Leonardo and upload the sketch.
Is the problem in the code? it should be wake up each 2 sec,does it the reason for this problem?
Answer: The watchDog time is shortly, the program stuck in the loop. I used Arduino Nano as ISP, then burn the bootloader to my Leonardo. Everything is fine now.
/
/****************************************************************
/*
* Watchdog Sleep Example
* Demonstrate the Watchdog and Sleep Functions
* Photoresistor on analog0 Piezo Speaker on pin 10
*
* KHM 2008 / Lab3/ Martin Nawrath nawrath@khm.de
* Kunsthochschule fuer Medien Koeln
* Academy of Media Arts Cologne
*/
//****************************************************************
#include <avr/sleep.h>
#include <avr/wdt.h>
#ifndef cbi
#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))
#endif
#ifndef sbi
#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
#endif
int nint;
int pinLed=13;
int pinPiezoSpeaker=10;
volatile boolean f_wdt=1;
void setup(){
Serial.begin(38400);
pinMode(pinLed,OUTPUT);
pinMode(pinPiezoSpeaker,OUTPUT);
Serial.println("nightingale");
// CPU Sleep Modes
// SM2 SM1 SM0 Sleep Mode
// 0 0 0 Idle
// 0 0 1 ADC Noise Reduction
// 0 1 0 Power-down
// 0 1 1 Power-save
// 1 0 0 Reserved
// 1 0 1 Reserved
// 1 1 0 Standby(1)
cbi( SMCR,SE ); // sleep enable, power down mode
cbi( SMCR,SM0 ); // power down mode
sbi( SMCR,SM1 ); // power down mode
cbi( SMCR,SM2 ); // power down mode
setup_watchdog(7);
}
byte del;
int cnt;
byte state=0;
int light=0;
//****************************************************************
//****************************************************************
//****************************************************************
void loop(){
if (f_wdt==1) { // wait for timed out watchdog / flag is set when a watchdog timeout occurs
f_wdt=0; // reset flag
light=analogRead(0); // reading photoresistor
Serial.print("light: " );
Serial.println(light );
switch (state){
case 0: // waiting for dawn
if (light < 500) { // light threshold
state=1;
}
break;
case 1: // waiting for dusk
if (light > 800) { // light threshold
state=0;
whistle();
}
break;
}
nint++;
digitalWrite(pinLed,1); // let led blink
Serial.print("Sleep " );
Serial.println(nint );
delay(2); // wait until the last serial character is send
digitalWrite(pinLed,0);
pinMode(pinLed,INPUT); // set all used port to intput to save power
pinMode(pinPiezoSpeaker,INPUT); // set all used port to intput to save power
system_sleep();
pinMode(pinLed,OUTPUT); // set all ports into state before sleep
pinMode(pinPiezoSpeaker,OUTPUT); // set all ports into state before sleep
}
}
//****************************************************************
// put some whiste sound on piezo
void whistle() {
for (int ii = 0; ii<= 20; ii++) {
for (del=0; del <=254; del++) {
digitalWrite(pinPiezoSpeaker,0);
delayMicroseconds((ii*5)+(del * 2));
digitalWrite(pinPiezoSpeaker,1);
delayMicroseconds((ii*5)+(del * 2));
}
PORTB ^= 32; // toggle pinLed
}
}
//****************************************************************
// set system into the sleep state
// system wakes up when wtchdog is timed out
void system_sleep() {
cbi(ADCSRA,ADEN); // switch Analog to Digitalconverter OFF
set_sleep_mode(SLEEP_MODE_PWR_DOWN); // sleep mode is set here
sleep_enable();
sleep_mode(); // System sleeps here
sleep_disable(); // System continues execution here when watchdog timed out
sbi(ADCSRA,ADEN); // switch Analog to Digitalconverter ON
}
//****************************************************************
// 0=16ms, 1=32ms,2=64ms,3=128ms,4=250ms,5=500ms
// 6=1 sec,7=2 sec, 8=4 sec, 9= 8sec
void setup_watchdog(int ii) {
byte bb;
int ww;
if (ii > 9 ) ii=9;
bb=ii & 7;
if (ii > 7) bb|= (1<<5);
bb|= (1<<WDCE);
ww=bb;
Serial.println(ww);
MCUSR &= ~(1<<WDRF);
// start timed sequence
WDTCSR |= (1<<WDCE) | (1<<WDE);
// set new watchdog timeout value
WDTCSR = bb;
WDTCSR |= _BV(WDIE);
}
//****************************************************************
// Watchdog Interrupt Service / is executed when watchdog timed out
ISR(WDT_vect) {
f_wdt=1; // set global flag
}