modern-embedded-programming-course/lesson-55/stm32c031-freertos-cube

NOTE You must generate the code from the project.ioc file before building the application. If you forget to do this, the following errors will be reported:

fatal error: stm32c0xx_hal.h: No such file or directory 30 | #include "stm32c0xx_hal.h" . . .

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 QV kernel. The example requires a logic analyzer.

STM32 NUCLEO-C031C6

Code Organization

stm32c031-cube
|   .project       // STM32CubeMX project
|   project.ioc    // STM32CubeMX config (for code generation)
|
+---Core           // core application generated by STM32CubeMX
|   +---Inc        // include files
|   +---Src        // source files
|   |       . . .
|   |       real-time.qm // QM model file for the application
|   +---Startup
|
+---qpc            // QP/C real-time event framework
|   +---include
|   +---src
|   |   +---qf
|   |   +---qv
|   +---ports
|   |   +---arm-cm
|   |   |   +---qv
|   |   |   |   +---gnu
|   |       . . .

Features Demonstrated

The example QP application consists of 2 periodic tasks (Active Objects) and two sporadic, long-running tasks (Active Objects).

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.

          CN7                                       CN10

       PD0    PD1                                PD3    NC
       PD2    PD2                                PB8    NC
       VDD    E5V                                PB0    NC
       PA14   GND -- GND                         AVDD   5V-USB-CHG
       NC     NC                                 GND    PA3
       NC     IOREF                       CH8 -- PA5    PC15
       PA13   NRST                        CH3--  PA6    PB12
       NC     3V3                         CH2 -- PA7    PB12
       PC6    +5V                                PB0    PB2
       GND    GND                         CH7 -- PC7    GND
       NC     GND                                PA9    PF3
CH1 -- PC13   VIN                                PA15   PA8
       PC14   NC                                 PB5    PB15
       NC     PA0 -- CH6                         PB4    PB14
       PF0    PA1 -- CH5                         PB10   PB13
       PF1    PA4 -- CH4                         PB3    AGND
       NC     PB1                                PA10   PB0
       PB11   PA11/PB9                           PB6    NC
       PA2    PA12/PB8                           PB7    NC

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%

Example Logic Analyzer Traces

Logic analyzer trace after pressing the button (non-preemptive QV kernel)

Logic analyzer trace after pressing the button (preemptive QK kernel)

Logic analyzer trace after pressing the button (preemptive FreeRTOS kernel)