Summary

This technical postmortem investigates a motor control issue involving an LCD touchscreen and Raspberry Pi Pico 2. The goal is to detect touch events and transform motor behavior accordingly. The setup combines GPIO, LCD display, and timing mechanisms.

Root Cause

• Timer misconfiguration: The timing functions are not placing motor changes at the right times.
• Inadequate motor speed detection logic: The speed update logic is not properly captured after a touch.
• Delay in GPIO updates: Misuse of delayed functions can suppress motor responsiveness.

Real-World Impact

• Delayed motor response leads to a sluggish user experience.
• Misunderstanding interrupt vs. timer control affects system stability.
• May result in repeated touch-sprinting behavior if not carefully calibrated.

Example or Code (if necessary and relevant)

// Adjust timer usings to trigger motor changes immediately
bool updateMotorSpeed(int touchData) {
    if (touchData == state) { // rapidly switch between states
        motor_state = !motor_state;
        gpio_getPin(BOBINAS[state], GPIO_INIZE);
        motor_on = motor_state;
        drawImagem((state + 1) % 4); // Faster state transition
    }
}

How Senior Engineers Fix It

• Implement precise timers and state transitions.
• Use interrupt-driven logic where applicable.
• Review motor control code for responsiveness and proper scaling.

Why Juniors Miss It

• Lack of understanding of timing mechanics.
• Overlooking the role of GPIO state in real-time control.
• Not validating motor response after each touch event.