PIR motion sensor on the ARM MBED

this is the code now. with an interrupt in and fall edge. I'm not sure how to implement the Lcd screen as when I put it into it it doesn't seem to work? how do I get it so where the alarm is triggered and its a falling edge, a message will appear on the screen?

thanks George

#include "mbed.h" #include "C12832.h" //example using InterruptIn with the input from the PIR motion sensors InterruptIn alarm(p11); DigitalOut led(LED1); DigitalOut flash(LED4); C12832 lcd(p5, p7, p6, p8, p11); void flip() { led = !led; } int main() { alarm.mode(PullUp); wait(2); alarm.fall(&flip); // attach the address of the flip function to the falling edge while(1) { // wait around, interrupts will interrupt flash = !flash; wait(0.25); } }