Write a program that basically when you push the button, LED1 toggles, and when you release it, LED2 toggles. Modify the program, so that at the push of the button, the micro cycles through 4 different as follows: 1- LED1 flashes while LED2 off 2- LED2 flashes while LED1 off 3- LED1 and LED2 flash simultaneously 4- LED1 and LED2 flash alternatively Hint: use a counting semaphore to cycle through 4 different values, each of which corresponds to the four different modes,