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FreeRTOS is a very A small RTOS that provides task scheduler, synchronization mechanism and memory management. If you just need a simple multiplex environment, it is a very suitable lightweight RTOS. In fact, this article is strictly not a transplant, it can only be said to be installed. Because FreeRTOS originally supports ARM Cortex-m4, you only need to add the source code to the project, and the required functions for the connection can be used. 4.1 Porting the FreeRTOS main program To the official website to do*nload the source code, this is FreeRTOSv9.0.0.zip. However, the migration methods of each version are similar, and they are universal. The UART is the most commonly used debug interface for general embedded systems. Usually, the PC must have received hardware. However, the circuit version of neculeo already includes a virtual com port to connect to USART2. So just set USART2 and connect to neculeo on the PC via the terminal program (ex: putty). The initialization of the STM32 peripheral includes the following steps. Setting the pin: Due to the limited number of pins, some peripherals share the pin. Moreover, in order to use the elasticity, there may be more than one set of feet in the periphery. So set the pin to the correct mode before use. Set the perimeter: Set the peripheral hardware parameter setting interrupt: If the peripheral will use the interrupt in the application, you need to set the NVIC. In addition, the peripheral preset clock of the STM32 is turned off, so you need to turn on the peripheral clock before using any peripherals. To include GPIO, you must first turn on clock. 3.1 Setting GPIO USART2 uses the pin positions GPIOA2 and GPIOA3. First set these two pins to USART. Calling 2.1 Creating a Model Project There are already sample projects for other compilers in the standard library provided by STmicroelectronics. We will modify the prototype project from the inside. The steps to set up the project at first are more complicated, so first create an empty project as a model to stay, and then you can copy the template directly after writing the program. Create a directory to place the project stm32f466 My development environment is built under Windows, mainly based on DOS command line, and then used with eclipse as editor and integrated development tools.