我正在ATTINY 85上编写一个简单的程序 . 该程序应该在芯片唤醒时点亮LED引脚，并在它处于睡眠状态时将其关闭 . 但是，当我将看门狗定时器设置为在0.5秒后复位时，它会在第一次复位时复位，然后在仅约100ms后复位 . 我用示波器检查了它，prinstcreen在这个链接下：https://i.snag.gy/WovBsf.jpg
这是代码：
/*
* Sketch for testing sleep mode with wake up on WDT.
* Donal Morrissey - 2011.
* ATTINY85
*/
#include <TinyWireM.h> // I2C Master lib for ATTinys which use USI - comment this out to use with standard arduinos
#include <LiquidCrystal_attiny.h> // for LCD w/ GPIO MODIFIED for the ATtiny85
#include <avr/sleep.h>
#include <avr/power.h>
#include <avr/wdt.h>
#include <avr/interrupt.h>
//uwaga na numer pinu! nie używać tego z resetem
#define OUT_PIN 3
#define GPIO_ADDR 0x27
LiquidCrystal_I2C lcd(GPIO_ADDR, 16, 2); // set address & 16 chars / 2 lines
volatile int f_wdt=1;
/***************************************************
* Name: ISR(WDT_vect)
*
* Returns: Nothing.
*
* Parameters: None.
*
* Description: Watchdog Interrupt Service. This
* is executed when watchdog timed out.
*
***************************************************/
ISR(WDT_vect){
if(f_wdt == 0){
f_wdt=1;
}
else{
// lcd.clear();
// lcd.print("WDT overrun");
// delay(500);
}
}
/***************************************************
* Name: enterSleep
*
* Returns: Nothing.
*
* Parameters: None.
*
* Description: Enters the arduino into sleep mode.
*
***************************************************/
void enterSleep(void)
{
// lcd.clear();
// lcd.print("Asleep...");
set_sleep_mode( SLEEP_MODE_PWR_DOWN ); /* EDIT: could also use SLEEP_MODE_PWR_DOWN for lowest power consumption. */
sleep_enable();
/* Now enter sleep mode. */
sleep_mode();
/* The program will continue from here after the WDT timeout*/
sleep_disable(); /* First thing to do is disable sleep. */
/* Re-enable the peripherals. */
power_all_enable();
}
/***************************************************
* Name: setup
*
* Returns: Nothing.
*
* Parameters: None.
*
* Description: Setup for the serial comms and the
* Watch dog timeout.
*
***************************************************/
void setup()
{
/* Setup the LCD */
lcd.init(); // initialize the lcd
lcd.backlight(); // Print a message to the LCD.
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Initializing...");
delay(500);
/*** Setup the WDT ***/
/* Clear the reset flag of watchdog interrupts, so that they are available again. */
MCUSR &= ~(1<<WDRF);
/* Enable configuration changes
*/
WDTCR |= (1<<WDCE) | (1<<WDE);
/*
WDP3 WDP2 WDP1 WDP0 Number of WDT Typical Time-out at
Oscillator Cycles VCC = 5.0V
0 0 0 0 2K (2048) cycles 16 ms
0 0 0 1 4K (4096) cycles 32 ms
0 0 1 0 8K (8192) cycles 64 ms
0 0 1 1 16K (16384) cycles 0.125 s
0 1 0 0 32K (32768) cycles 0.25 s
0 1 0 1 64K (65536) cycles 0.5 s
0 1 1 0 128K (131072) cycles 1.0 s
0 1 1 1 256K (262144) cycles 2.0 s
1 0 0 0 512K (524288) cycles 4.0 s
1 0 0 1 1024K (1048576) cycles 8.0 s
*/
/* set new watchdog timeout prescaler value */
WDTCR = 0<<WDP3 | 1<<WDP2 | 0<<WDP1 | 1<<WDP0 ;
/* Enable the WD interrupt (note no reset). */
WDTCR |= (1<<WDIE);
lcd.clear();
lcd.print("Initialisation complete.");
delay(100);
}
/***************************************************
* Name: enterSleep
*
* Returns: Nothing.
*
* Parameters: None.
*
* Description: Main application loop.
*
***************************************************/
void loop()
{
if(f_wdt == 1)
{
// lcd.clear();
// lcd.print("Awake!");
digitalWrite( OUT_PIN, HIGH );
delay(1000);
/* Don't forget to clear the flag. */
f_wdt = 0;
digitalWrite( OUT_PIN, LOW );
/* Re-enter sleep mode. */
enterSleep();
}
else
{
/* Do nothing. */
}
}
有人知道如何解决这个问题吗？
编辑：好吧，我设法修复它 . 我唯一需要改变的是在睡眠前启用WDT中断，然后在睡眠后禁用它 . 所以enetSleep函数如下所示：
void enterSleep(void)
{
lcd.clear();
lcd.print("Asleep...");
/* Enable the WD interrupt (note no reset). */
WDTCR |= (1<<WDIE);
set_sleep_mode( SLEEP_MODE_PWR_DOWN ); /* EDIT: could also use SLEEP_MODE_PWR_DOWN for lowest power consumption. */
sleep_enable();
/* Now enter sleep mode. */
sleep_mode();
/* The program will continue from here after the WDT timeout*/
sleep_disable(); /* First thing to do is disable sleep. */
/* Re-enable the peripherals. */
power_all_enable();
/* Disable the WD interrupt */
WDTCR &= ~_BV(WDIE);
}
当然，我删除了
WDTCR |= (1<<WDIE);
从设置行 .