A minimal cooperative RTOS implementation for STM32F103 (Blue Pill) microcontroller.

• Simple round-robin cooperative scheduler
• Task creation and management (up to 4 tasks)
• Task delay with 1ms tick resolution
• Lightweight implementation suitable for resource-constrained systems

• Board: STM32F103C8T6 (Blue Pill)
• Clock: 36 MHz (HSI with PLL)
• LED: PC13 (onboard LED)

• Core/Inc/minirtos.h - RTOS API and definitions
• Core/Src/minirtos.c - RTOS scheduler implementation
• Core/Src/main.c - Main application with LED blink task

make -j16 DEBUG=1 -f STM32Make.make

make -j16 DEBUG=1 -f STM32Make.make flash

#include "minirtos.h"

void Task_BlinkLED(void)
{
    HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_13);
    RTOS_Delay(500);  /* Delay 500ms */
}

int main(void)
{
    HAL_Init();
    SystemClock_Config();
    MX_GPIO_Init();
    
    RTOS_Init();
    RTOS_CreateTask(Task_BlinkLED);
    RTOS_Start();  /* Never returns */
}

STMicroelectronics software components are provided AS-IS.