Andy A / WakeUp

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WakeUp Class Reference
Static Public Member Functions

WakeUp Class Reference

Class to make wake up a microcontroller from deepsleep using a low-power timer. More...

#include <WakeUp.h>

Static Public Member Functions

static void set (uint32_t s)
 Set the timeout.
static void set_ms (uint32_t ms)
 Set the timeout.
static void attach (void(*function)(void))
 Attach a function to be called after timeout.
static void calibrate (void)
 Calibrate the timer.
static float timeElapsed (void)
 Time since we went to sleep.

Detailed Description

Class to make wake up a microcontroller from deepsleep using a low-power timer. 

 // Depending on the LED connections either the LED is off the 2 seconds
 // the target spends in deepsleep(), and on for the other second. Or it is inverted 
 
 #include "mbed.h"
 #include "WakeUp.h"
 
 DigitalOut myled(LED1);
 
 int main() {
     wait(5);

     //The low-power oscillator can be quite inaccurate on some targets
     //this function calibrates it against the main clock
     WakeUp::calibrate();
    
     while(1) {
         //Set LED to zero
         myled = 0;
         
         //Set wakeup time for 2 seconds
         WakeUp::set_ms(2000);
         
         //Enter deepsleep, the program won't go beyond this point until it is woken up
         deepsleep();
         
         //Set LED for 1 second to one
         myled = 1;
         wait(1);
     }
 }

Definition at line 39 of file WakeUp.h.

Member Function Documentation

static void attach ( void(*)(void)  function ) [static]

Attach a function to be called after timeout.

This is optional, if you just want to wake up you do not need to attach a function.

Important: Many targets will run the wake-up routine at reduced clock speed, afterwards clock speed is restored. This means that clock speed dependent functions, such as printf might end up distorted.

Also supports normal way to attach member functions (not documented for simplicity)

Parameters:
*functionfunction to call

Definition at line 74 of file WakeUp.h.

void calibrate ( void   ) [static]

Calibrate the timer.

Some of the low-power timers have very bad accuracy. This function calibrates it against the main timer.

Warning: Blocks for 100ms!

Definition at line 51 of file WakeUp_LPC11u24.cpp.

static void set ( uint32_t  s ) [static]

Set the timeout.

Parameters:
srequired time in seconds

Definition at line 47 of file WakeUp.h.

void set_ms ( uint32_t  ms ) [static]

Set the timeout.

Parameters:
msrequired time in milliseconds

Definition at line 16 of file WakeUp_LPC11u24.cpp.

float timeElapsed ( void   ) [static]

Time since we went to sleep.

Give the time in seconds since we entered sleep (meaningless if we woke up on the timer).

Definition at line 65 of file WakeUp_LPC11u24.cpp.

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