Real-Time Multitasking with FreeRTOS on ESP32

10 Lektionen in dieser Stufe

1. Tasks versus the Super Loop: When an RTOS Helps
   Explain preemptive scheduling and judge when tasks simplify a design. · Lab: Identify which parts of an earlier project would become tasks and why.
2. Creating Tasks, Stack Sizes and Priorities
   Start tasks with suitable stack and priority and see how the scheduler chooses. · Lab: Run two LED tasks at different priorities and observe starvation when one never blocks.
3. Blocking Delays and Periodic Tasks with vTaskDelayUntil
   Yield the processor correctly and keep exact periods. · Lab: Compare timing drift of two periodic tasks on the logic analyzer.
4. Passing Data Safely Through Queues
   Send values and structs between tasks without shared variables. · Lab: Feed sensor samples from a producer task to a display task and handle a full queue.
5. Mutexes and Protecting Shared Buses
   Guard I2C, SPI and serial access used by several tasks and understand priority inheritance. · Lab: Garble serial output with two tasks, then fix it with a mutex.
6. Binary Semaphores and Deferred Interrupt Handling
   Signal a task from an interrupt and do the real work outside the service routine. · Lab: Handle a button interrupt by waking a high-priority task.
7. Task Notifications and Software Timers
   Use lightweight signalling and timer callbacks instead of extra tasks. · Lab: Replace a semaphore with a notification and add a one-shot timeout timer.
8. Pinning Tasks to Cores and Coexisting with Wi-Fi
   Distribute work across the two cores without disturbing the radio stack. · Lab: Pin a time-critical sampling task to one core and measure jitter with Wi-Fi traffic running.
9. Finding Stack Overflows, Starvation and Deadlocks
   Use high-water marks, task lists and reasoning about lock order to locate concurrency bugs. · Lab: Diagnose three prepared faulty programs and fix each.
10. Task Watchdogs and Recovering from Hangs
    Supervise tasks and restart cleanly while recording the cause. · Lab: Make a task hang on purpose and show the watchdog reset with the reason reported after reboot.

Abschlussprojekt

A multitasking data acquisition unit with separate sensor, display, network and storage tasks linked by queues, with stack monitoring and watchdog recovery.

Teile für diese Stufe

• 1 × ESP32 development board
• 1 × USB cable matching the board
• 1 × Solderless breadboard 830 points
• 1 × Jumper wire set male-male and male-female
• 1 × BME280 pressure, humidity and temperature module
• 1 × MPU-6050 accelerometer and gyroscope module
• 1 × OLED display 0.96 inch I2C 128x64
• 1 × microSD card module 3.3 V
• 1 × microSD card 8–32 GB
• 4 × LED 5 mm assorted
• 4 × Resistor 220 ohm
• 2 × Tactile push button
• 1 × USB logic analyzer 8 channel

In jeder Lektion legst du die passenden Teile direkt in den Warenkorb. Arduino-kompatibel →