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10 years ago.
lpc11u24 Simple deepsleep and interrupt wakeup example
I tried to use the lpc11u24 Simple deepsleep and interrupt wakeup example on the mbed NXP LPC11U24 Handbook page, and just tried to flash some LEDs after wakeup:
Simple deepsleep wakeup
#include "mbed.h"
DigitalOut myled1(LED1);
DigitalOut myled2(LED2);
DigitalOut myled3(LED3);
DigitalOut myled4(LED4);
InterruptIn wakeup(p10);
int i = 0;
void LEDrun()
{
unsigned int i, msw=50;
for (i=1; i<=3; i++)
{
myled1 = 1;
wait_ms(msw);
myled2 = 1;
wait_ms(msw);
myled3 = 1;
wait_ms(msw);
myled4 = 1;
wait_ms(msw);
myled1 = 0;
wait_ms(msw);
myled2 = 0;
wait_ms(msw);
myled3 = 0;
wait_ms(msw);
myled4 = 0;
wait_ms(msw);
}
}
int main()
{
wakeup.rise(NULL); // Setup rising edge interrupt (no handler function needed)
while (1)
{
deepsleep(); // Deep sleep until external interrupt
LEDrun(); // We've come out of sleep due to interrupt, so flash some LEDs!
wait(1);
}
}
However - it doesn't seem to wakeup at all. Nothing happens. Has anybody a hint what I am doing wrong? Thanks!
1 Answer
10 years ago.
Ah that is where people are getting that wrong piece of code from :P. These days (read: a few years or so), wake.rise(NULL) disables the interrupt. Not exactly what you want. Solution: Attach a function with wake.rise(&yourFunction). The yourFunction doesn't actually need to do anything, it just needs to exist so it enables the interrupt.