Arduino 低功耗优化
来自Jack's Lab
（版本间的差异）
(→深入 ATMEGA 328) |
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| 第19行： | 第19行： | ||
[[文件:Atmega328p-power-mode.png]] | [[文件:Atmega328p-power-mode.png]] | ||
| + | <br><br> | ||
| + | == 代码 == | ||
| − | + | <source lang=java> | |
| − | < | + | #include <avr/sleep.h> |
| + | #include <avr/wdt.h> | ||
| + | |||
| + | volatile byte data=0; | ||
| + | |||
| + | void setup() { | ||
| + | pinMode(13,OUTPUT); | ||
| + | setup_watchdog(9); | ||
| + | // 0=16ms, 1=32ms,2=64ms,3=128ms,4=250ms,5=500ms | ||
| + | // 6=1 sec,7=2 sec, 8=4 sec, 9= 8sec | ||
| + | ACSR |=_BV(ACD);//OFF ACD | ||
| + | ADCSRA=0;//OFF ADC | ||
| + | Sleep_avr();//Sleep_Mode | ||
| + | } | ||
| + | |||
| + | void loop() { | ||
| + | |||
| + | if(data>=7){ | ||
| + | data=0; | ||
| + | //------------------------------- | ||
| + | digitalWrite(13,HIGH); | ||
| + | delay(100); //此处是到达设置唤醒时间允许的程序 | ||
| + | digitalWrite(13,LOW); | ||
| + | //-------------------------------- | ||
| + | Sleep_avr(); | ||
| + | } | ||
| + | else { | ||
| + | Sleep_avr(); //Continue Sleep | ||
| + | } | ||
| + | |||
| + | } | ||
| + | |||
| + | //Sleep mode is activated | ||
| + | void setup_watchdog(int ii) { | ||
| + | |||
| + | byte bb; | ||
| + | |||
| + | if (ii > 9 ) ii=9; | ||
| + | bb=ii & 7; | ||
| + | if (ii > 7) bb|= (1<<5); | ||
| + | bb|= (1<<WDCE); | ||
| + | |||
| + | MCUSR &= ~(1<<WDRF); | ||
| + | // start timed sequence | ||
| + | WDTCSR |= (1<<WDCE) | (1<<WDE); | ||
| + | // set new watchdog timeout value | ||
| + | WDTCSR = bb; | ||
| + | WDTCSR |= _BV(WDIE); | ||
| + | |||
| + | |||
| + | } | ||
| + | //WDT interrupt | ||
| + | ISR(WDT_vect) { | ||
| + | |||
| + | ++data; | ||
| + | // wdt_reset(); | ||
| + | |||
| + | } | ||
| + | |||
| + | void Sleep_avr(){ | ||
| + | set_sleep_mode(SLEEP_MODE_PWR_DOWN ); // sleep mode is set here | ||
| + | sleep_enable(); | ||
| + | sleep_mode(); // System sleeps here | ||
| + | } | ||
| + | </source> | ||
<br><br> | <br><br> | ||
<br><br> | <br><br> | ||
2015年3月17日 (二) 16:06的版本
1 概述
常用的 Atmega328p 最小系统下 16MHz 运行功耗大约是10mA，一块手机1200mAh的电池大约可不间断运行 1200/10/24 = 5天，这个还是在没有任何外围器件的情况下，算上外围设备如温度传感器等，连续运行的时间更短
2 深入 ATMEGA 328
328P有6种节电设置，分别是：
- 空闲模式
- ADC 噪声抑制模式
- 掉电模式
- 省电模式
- Standby 模式
- 扩展Standby 模式
3 代码
#include <avr/sleep.h>
#include <avr/wdt.h>
volatile byte data=0;
void setup() {
pinMode(13,OUTPUT);
setup_watchdog(9);
// 0=16ms, 1=32ms,2=64ms,3=128ms,4=250ms,5=500ms
// 6=1 sec,7=2 sec, 8=4 sec, 9= 8sec
ACSR |=_BV(ACD);//OFF ACD
ADCSRA=0;//OFF ADC
Sleep_avr();//Sleep_Mode
}
void loop() {
if(data>=7){
data=0;
//-------------------------------
digitalWrite(13,HIGH);
delay(100); //此处是到达设置唤醒时间允许的程序
digitalWrite(13,LOW);
//--------------------------------
Sleep_avr();
}
else {
Sleep_avr(); //Continue Sleep
}
}
//Sleep mode is activated
void setup_watchdog(int ii) {
byte bb;
if (ii > 9 ) ii=9;
bb=ii & 7;
if (ii > 7) bb|= (1<<5);
bb|= (1<<WDCE);
MCUSR &= ~(1<<WDRF);
// start timed sequence
WDTCSR |= (1<<WDCE) | (1<<WDE);
// set new watchdog timeout value
WDTCSR = bb;
WDTCSR |= _BV(WDIE);
}
//WDT interrupt
ISR(WDT_vect) {
++data;
// wdt_reset();
}
void Sleep_avr(){
set_sleep_mode(SLEEP_MODE_PWR_DOWN ); // sleep mode is set here
sleep_enable();
sleep_mode(); // System sleeps here
}
