FreeRTOS Task and Queue Design
Partition work into bounded tasks with queues, ownership, priorities and measurable stack margins.
Arduino-compatible frameworks, ESP-IDF/FreeRTOS, PIC/AVR/STM32/RP-class systems; apply exact vendor documentation for the selected MCU.Architecture
Interrupts notify tasks; queues transfer immutable messages; one owner controls each peripheral/resource.
Security and recovery risks
- Never block indefinitely without a deliberate design.nDo not call non-ISR-safe APIs from interrupts.nRecord FreeRTOS and toolchain versions.
Implementation procedure
- List tasks, period/deadline and worst-case execution.nAssign priorities from deadlines, not importance labels.nUse queues/notifications instead of shared polling.nMeasure stack high-water marks.nTest overload, queue-full and priority-inversion cases.
Starter code / configuration
xTaskNotifyFromISR(task, EVENT_RX, eSetBits, &woken);Verification evidence
| Test | Expected | Evidence |
|---|---|---|
| Nominal boot | Correct version and hardware revision reported | Captured boot log |
| Fault recovery | Defined safe state and reset reason | Fault-injection record |
| Power cycle | No corrupt configuration or unsafe output | Repeated-cycle log |
Required release artifacts
- Versioned firmware binary and SHA-256
- Source revision / build identifier
- Board and hardware-revision compatibility list
- Test report and known limitations
- Recovery image and factory-reset procedure
- Provisioning/calibration schema
- Release approval record
Local browser tools
Firmware production workbench
A/B update exercise
OTA and automatic rollback simulator
Advance one validated stage at a time. A failed boot test returns the device to the previous slot.
- Running confirmed firmware from Slot A.
Release gate
Production-readiness checklist
A downloadable release decision is generated only after every mandatory control is confirmed.