consider a push button being connected to p16 on the mbed bo

consider a push button being connected to p16 on the mbed board so that p16 will be set to 1 when the push button is pushed down and 0 when the push button is released. Write a program to receive the push down of the push button as an interrupt event, and to respond to it with the starting of a ticker to flash the LED4 on the mbed board to flash every 10 seconds (on for 5 seconds and off for 5 seconds). Please do not use any wait(), wait_ms() or wait_us() functions.

The following are the API information:

InterruptIn API:

InterruptIn (PinName pin)

             Create an InterruptIn connected to the specified pin.

void      rise (void(*fptr)(void))

            Attach a function to call when a rising edge occurs on the input.

void      fall (void(*fptr)(void))

            Attach a function to call when a falling edge occurs on the input.

void      mode (PinMode pull)

            Set the input pin mode.

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Timer API

void      start ()

            Start the timer.

void      stop ()

            Stop the timer.

void      reset ()

           Reset the timer to 0.

float     read ()

           Get the time passed in seconds.

int       read_ms ()

          Get the time passed in mili-seconds.

int       read_us ()

           Get the time passed in micro-seconds.

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Timeout API

void      attach (void(*fptr)(void), float t)

            Attach a function to be called by the Ticker , specifiying the interval in seconds.

void      attach_us (void(*fptr)(void), timestamp_t t)

            Attach a function to be called by the Ticker , specifiying the interval in micro-seconds.

void      detach ()

            Detach the function.

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Ticker API

void      attach (void(*fptr)(void), float t)

             Attach a function to be called by the Ticker , specifiying the interval in seconds.

void      attach_us (void(*fptr)(void), timestamp_t t)

            Attach a function to be called by the Ticker , specifiying the interval in micro-seconds.

void      detach ()

            Detach the function.

Solution

#include \"mbed.h\"

InterruptIn button(P1_16); //interrupt pin

Ticker flicker;//ticker function init

DigitalOut flash(LED4); //led 4 as OUTPUT

void blink()//timer isr

{

flash=!flash;//led state change

}

//interrupt isr

void flip() {

flicker.attached (&blink,5);//timer for 5 sec

}

int main() {     button.rise(&flip);  // attach the address of the flip function to the rising edge     while(1) {           // wait around, interrupts will interrupt this!   

}

}