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lib/SX12XX-LoRa/src/AtmelSleep.h

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+/*******************************************************************************************************
+  Programs for Arduino - Copyright of the author Stuart Robinson - 24/04/20
+
+  This program is supplied as is, it is up to the user of the program to decide if the program is
+  suitable for the intended purpose and free from errors.
+  
+  These are sleep routines for Atmel processors, tested on ATmega328. When calling the sleep routines be
+  sure there are no pending interrupts such as from Serial.print(), strange things can happen otherwise.
+*******************************************************************************************************/
+
+
+
+#include <avr/sleep.h>          //sleep library for Atmel processor  
+#include <avr/wdt.h>            //watchdog library for Atmel processor  
+
+
+//Atmel watchdog sleep times
+#define sleep16mS 0x00
+#define sleep32mS 0x01
+#define sleep64mS 0x02
+#define sleep125mS 0x03
+#define sleep250mS 0x04
+#define sleep500mS 0x05
+#define sleep1000mS 0x06
+#define sleep2000mS 0x07
+#define sleep4000mS 0x20
+#define sleep8000mS 0x21
+
+
+void SleepSeconds(uint32_t secs);
+void SleepmS(uint32_t sleeps, uint8_t numbermS);
+void atmelSleepPermanent();
+
+
+void SleepSeconds(uint32_t secs)
+{
+  //for Atmel processor only
+  uint16_t sleeps8secs, sleeps1secs;
+
+  sleeps8secs = secs >> 3;
+  sleeps1secs = secs - (sleeps8secs << 3);
+  SleepmS(sleeps8secs, sleep8000mS);
+  SleepmS(sleeps1secs, sleep1000mS);
+}
+
+
+
+void SleepmS(uint32_t sleeps, uint8_t numbermS)
+{
+  //for Atmel processor only
+  uint32_t index;
+
+  for (index = 1; index <= sleeps; index++)
+  {
+    ADCSRA = 0;                                      //disable ADC
+    MCUSR = 0;                                       //clear various "reset" flags
+    WDTCSR = bit (WDCE) | bit (WDE);                 //allow changes, disable reset
+    WDTCSR = bit (WDIE) + numbermS;                  //set the number of mS for sleep
+    wdt_reset();                                     //pat the pet, could be a dog
+    set_sleep_mode (SLEEP_MODE_PWR_DOWN);
+    noInterrupts ();                                 //timed sequence follows
+    sleep_enable();
+    MCUCR = bit (BODS) | bit (BODSE);                //turn off brown-out enable in software
+    MCUCR = bit (BODS);
+    interrupts ();                                   //guarantees next instruction executed
+
+    sleep_cpu ();
+    //awake here
+    sleep_disable();                                 //cancel sleep as a precaution
+  }
+}
+
+
+void atmelSleepPermanent()
+{
+  ADCSRA = 0;                //disable ADC
+  set_sleep_mode (SLEEP_MODE_PWR_DOWN);
+  noInterrupts ();           //timed sequence follows
+  sleep_enable();
+
+  // turn off brown-out enable in software
+  MCUCR = bit (BODS) | bit (BODSE);  //turn on brown-out enable select
+  MCUCR = bit (BODS);        //this must be done within 4 clock cycles of above
+  interrupts ();             //guarantees next instruction executed
+
+  sleep_cpu ();              //sleep within 3 clock cycles of above
+
+  /* wake up here */
+
+  sleep_disable();
+}
+
+
+
+ISR (WDT_vect)
+{
+  //watchdog interrupt
+  wdt_disable();  // disable watchdog
+}
+
+