modern-embedded-programming-course/lesson-55/qpc/examples/arm-cm/real-time_nucleo-c031c6

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Real-Time Example on NUCLEO-C031C6

This example implements the "Periodic-Sporadic" application on the STM32 NUCLEO-C031C6 board (ARM Cortex-M0+). The example demonstrates various real-time preemption scenarios among active objects in the QK and QV kernels. The example requires a logic analyzer.

STM32 NUCLEO-C031C6

Logic analyzer trace after pressing the button (QK kernel)

Code Organization

examples\arm-cm\real-time_nucleo-c031c6
|
+---qk             // preemptive QK kernel
|   +---armclang   // ARM/KEIL MDK with Compiler 6 (ARM/CLANG)
|   |       rt-qk.uvprojx // uVision project
|
+---qv             // cooperative QV kernel
|   +---armclang   // ARM/KEIL MDK with Compiler 6 (ARM/CLANG)
|   |       rt-qv.uvprojx // uVision project
|
+---qv-ms          // cooperative QV kernel (multi-stage threads)
|   +---armclang   // ARM/KEIL MDK with Compiler 6 (ARM/CLANG)
|   |       rt-qv-ms.uvprojx // uVision project
|
+---qv-tt          // cooperative QV kernel (time-triggered)
|   +---armclang   // ARM/KEIL MDK with Compiler 6 (ARM/CLANG)
|   |       rt-qv-tt.uvprojx // uVision project

Features Demonstrated

The example QP application consists of 2 periodic threads (Active Objects) and two sporadic, long-running threads (Active Objects). Additionally, the Time-Triggered (TT) version has a tt-scheduler thread.

• directory qk: preemptive run-to-completion QK kernel

• directory qv: cooperative run-to-completion QV kernel with the same threads as QK

• directory qv-ms: cooperative run-to-completion QV kernel with multi-stage threads

• directory qv-tt: cooperative run-to-completion QV kernel with time-triggered threads

Building the Examples

ARM/KEIL MDK

• Open one of the provided KEIL uVision projects (e.g., rt-qk.uvprojx) in Keil uVision IDE. Build/Debug/Download to the board from the IDE.

Running the Examples

Setting up a Logic Analyzer

The NUCLEO-C031C6 needs to be conntected to a logic analyzer as shown in the picture below.

Connecting STM32 NUCLEO-C031C6 to a logic analyzer

The logic analyzer needs to be configured as follows:

• sampling rate: several MHz (e.g., 24MHz)
• trigger: Sporadic (PC.13 on the NUCLEO-C031C6), falling edge
• pre-trigger capture ratio: 10%