| Rapid firing example, frequency = 50/7 = 7.14Hz

| Rapid-fire the return key when fire_1 is pressed.
| Uses a 3 bit counter giving a frequency of 7.14Hz,
| see the counter in operation using !JS_Test

|---------------------------------------------------

| Count from 0 to 5 using flagA_1,flagB_1,flagA_2
setA_1   =  flagA_1.~flagA_2 + flagA_1.~flagB_1
resetA_1 =  flagA_1
setB_1   = ~flagA_2.~flagB_1.flagA_1
resetB_1 =  flagB_1.flagA_1 + flagA_2.flagB_1
setA_2   = ~flagA_2.flagB_1.flagA_1
resetA_2 =  flagA_2.flagB_1

| Press return when fire pressed and count is 0 - 3
return   = fire_1.~flagA_2

