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// Turn fuel pump on when the ECU has been powered on, and it has been less
// than 4 seconds since power was applied, or if RPMs are greater than 1
// or if the ECU detects the ignition key is in the "START" or "CRANK" position:
// "ENGINE_IS_CRANKING" is redundant, sort of, since if that is true, RPM should be > 1,
// but better safe than sorry, no? However, if the engine is cranking and we don't have sync,
// the fuel pump will not turn on until RPM can be determined, and it's possible fuel pressure
// could bleed off before sync. Additionally, this could be refactored to work in conjunction
// with a safety system, such that when triggered will ignore RPM and only restart the pump if
// the key is turned to crank position. Note: ON_TIME is in milliseconds
FUEL_PUMP_STATE = ((RPM > 1) || (ON_TIME < 4000) || ENGINE_IS_CRANKING || (MAP < BARO));
// maybe make the "on time" a user-defined variable for vehicles with low pump volume or similar requirements
// that could require more than a few seconds priming?
// MAP < BARO indicates the engine is cranking to start as well.
// could probably simplify to the below, and be fine.
// FUEL_PUMP_STATE = ((ON_TIME < 4000) || (MAP < BARO));


// Coolant fan control:
// On start / warm up, FAN=0, note: there may be two fans, or the fan may be dual-speed
// capable, so having something in the code to support this may be helpful. Suggest using
// qualifiers for that situation, to differentiate between one single speed fan and one dual-speed
// or two independent fans.
// FAN1 will only turn on once ENG_TEMP exceeds 95 degrees (Centigrade / Celsius I presume).
// Once on, it will remain on, due to the logical "OR" that the second condition presents until
// ENG_TEMP falls below 85 degrees.
// FAN2 will only turn on once ENG_TEMP exceeds 105 degrees (Centigrade / Celsius I presume).
// Once on, it will remain on, due to the logical "OR" that the second condition presents until
// ENG_TEMP falls below 95 degrees.
// Value "FAN2_PRESENT" is user-defined, indicating either a two-speed or second cooling fan
// is installed. If A/C is on the vehicle, FAN1 should run whenever the A/C is on if FAN2 is not 
// declared separately.
FAN1_STATE = ((AC_ON && !FAN2_PRESENT) || ((ENG_TEMP > 95) || (FAN1 * (ENG_TEMP > 85)))); 
FAN2_STATE = ((AC_ON && FAN2_PRESENT) || ((ENG_TEMP > 105) || (FAN2 * (ENG_TEMP > 95))));
// proper cooling system bypass and thermostat should negate any issues with 
// temperatures being below 'optimal'.

// Use of bit banding would allow mapping the above 'variables': FUEL_PUMP_STATE,
// FAN1_STATE and FAN2_STATE, to individual bits within GPIO ports so that those could be
// individually addressed and have actions affecting them applied as soon as
// 'assignments' such as above occur within the code.