STM32 with Arduino API (2/4): sequence and buttons

In this setup, the button we will use is connected to pin PC5. It is an
active-LOW button: when it is pressed, digitalRead(PC5) returns LOW;
when it is not pressed, it returns HIGH.

In the lab interface, use the control labelled Button 1 or B1. Press and
hold it while observing at least one full sequence, then release it before the
unpressed test. A quick click may finish before the program reads it.

The program uses three RGB outputs already wired in the remote setup. setup()
configures the button as an input and each RGB pin as an output. loop() reads
the button once at the start of each three-color cycle, selects a wait in
milliseconds, and turns on each channel in order. A press during a cycle takes
effect on the next cycle, so hold B1 until the new cycle begins.
The helper turnOffAll() groups three repeated off actions under one clear name.

#include <Arduino.h>

const int RGB_RED = PA8;
const int RGB_GREEN = PA9;
const int RGB_BLUE = PA10;
const int BUTTON_1 = PC5;  // Active LOW: pressed == LOW

void turnOffAll() {
  analogWrite(RGB_RED, 0);
  analogWrite(RGB_GREEN, 0);
  analogWrite(RGB_BLUE, 0);
}

void setup() {
  pinMode(BUTTON_1, INPUT);
  pinMode(RGB_RED, OUTPUT);
  pinMode(RGB_GREEN, OUTPUT);
  pinMode(RGB_BLUE, OUTPUT);
}

void loop() {
  bool pressed = digitalRead(BUTTON_1) == TODO_PRESSED_LEVEL;  // TODO 1: comparison level for a pressed active-LOW button
  int waitTime = 500;
  if (pressed) {
    waitTime = TODO_FAST_WAIT_MS;  // TODO 2: visible fast interval, in ms
  }

  turnOffAll();
  analogWrite(RGB_RED, 180);
  delay(waitTime);
  turnOffAll();
  analogWrite(RGB_GREEN, 180);
  delay(waitTime);
  turnOffAll();
  analogWrite(RGB_BLUE, 180);
  delay(waitTime);
}

Fill in the table after uploading the program and testing the button. Use only
two rows and leave the others blank if Teach shows more:

- Row 1: button not pressed.
- Row 2: button pressed.
- In Expected digitalRead value, write HIGH or LOW according to the
active-LOW logic.
- In Wait used, record the value in ms that the program applies.
- In Brief explanation, connect the button state with the observed speed.

Only after the two initial rows are complete, swap the first and last color
blocks so the sequence starts with blue and ends with red. Do not change either
wait value. Save, compile, upload, and repeat both button states. This separate
challenge checks that sequence order and button-controlled timing are different
rules.