State transition table approach in Embedded C - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define the number of states.

Embedded C

enum States { STATE_IDLE, STATE_PROCESS, STATE_DONE, [1] };

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ASTATE_COUNT

BNUM_STATES

CTOTAL_STATES

DMAX_STATES

Attempts:

3 left

💡 Hint

Common Mistakes

Using a name that does not represent the count of states.

Forgetting to add a count identifier at the end.

The enum ends with STATE_COUNT to represent the total number of states.

2fill in blank

medium

Complete the code to declare the state transition function pointer type.

Embedded C

typedef void (*StateFunc)([1]);

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Avoid

Bint

Cchar

Dvoid*

Attempts:

3 left

💡 Hint

Common Mistakes

Using int or other types instead of void.

Adding parameters when none are needed.

The state functions take no parameters and return void.

3fill in blank

hard

Fix the error in the state transition table declaration.

Embedded C

StateFunc state_table[[1]] = { state_idle, state_process, state_done };

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A3

B4

CNUM_STATES

DSTATE_COUNT

Attempts:

3 left

💡 Hint

Common Mistakes

Hardcoding the size instead of using STATE_COUNT.

Using an incorrect size causing out-of-bounds errors.

The array size should be STATE_COUNT to match the enum count.

4fill in blank

hard

Fill both blanks to correctly update the current state using the transition table.

Embedded C

current_state = [1];
state_table[[2]]();

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Anext_state

Bcurrent_state

Cstate_table

DSTATE_COUNT

Attempts:

3 left

💡 Hint

Common Mistakes

Calling the function with next_state instead of current_state.

Not updating current_state before calling the function.

Assign next_state to current_state, then call the function for current_state.

5fill in blank

hard

Fill all three blanks to define the state transition table with correct function pointers.

Embedded C

StateFunc state_table[STATE_COUNT] = { [1], [2], [3] };

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Astate_idle

Bstate_process

Cstate_done

Dstate_error

Attempts:

3 left

💡 Hint

Common Mistakes

Including a function not defined in the enum.

Mixing the order of functions.

The table must list the functions for each state in order.