First mistakes to recognize

Declaring inside a block

main {
    int value;  // invalid: runtime variables must be top-level
}

Move int value; above init / main.

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Confusing assignment and comparison

if(mode = 2) { }   // assigns 2; the condition is then true
if(mode == 2) { }  // compares; usually what was intended

Zen Studio Live warns about assignment in a condition, but write the intended operator.

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Using the wrong letter case

PS5_CROSS, ps5_cross, and PS5_Cross are different names. Only the defined constant is valid.

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Assuming a function changes its caller's variable

Function arguments are values held in local parameters:

int amount = 10;

main {
    amount = add_five(amount);  // store the returned value
}

function add_five(value) {
    value = value + 5;
    return value;
}

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Writing forever in an inner loop

while(TRUE) { }  // do not do this in live real-time code

main is already the repeating loop. Inner loops should complete quickly and have an obvious bound.