This version is the first release of the v3.1.0 branch. The main changes include kernel object type checking, device_ops interface, moving application modules from the kernel into components. Moreover, SAL, AT component, realtek rtl8710bn WiFi soc, Raspberry Pi 2B BSP etc was added. RT-Thread/ENV tool has also released a final version of v1.0.0; In this version, the building script is enhance for VSCode for compiling and debug.

From RT-Thread v3.0.4 to v3.1.0, there were about 470 commits, about 85,000 new lines of code and 190,000 lines of code removed.

The following is the change log since RT-Thread v3.0.4:

Kernel

• The main thread priority can be configured by Kconfig;
• Add the checking of kernel object type, which can effectively avoid the problem of continuing to use kernel objects after they are destroyed.
• Add the idle hook list to mount multiple idle hook, and can be configured by Kconfig.
• Add the device_ops operation set to reduce the footprint of device object.
• No special memory handle for application module when using SLAB memory management algorithm.
• Move application module from the kernel to libc/libdl.
• Enhance the debug information output of rtdbg.h file.
• In Keil/IAR tool chain, the RT_USED is used to keep symbols and avoid to add more argument or section in link phrase.

Components

• Remove all of external codes, which will be moved to packages in the future.
• Add initialization flag for shell, file system, network protocol stack etc to prevent repeated initialization;
• Enable the long file name feature of ELM FatFs in default.
• Change DFS FD to dynamic allocation mode. The maximum number of allocation is still DFS_FD_MAX.
• Add dfs_fdtable_get() function to get different fdtable;
• Add more DFS error messages, and provide easy to understand log when abnormal.
• Fix the problem of formatting FatFs file system when multiple FatFs file systems are mounted.
• Remove the folder enter feature in MSH when input a folder name;
• Add int finsh_set_prompt (const char * prompt); routine for set a custom prompt for msh;
• Add the Kconfig of VBUS.
• Move the application module from kernel to libc/libdl component;
• Rewrite most of the management code for application module: replace the original object container with the object list; split the symbol resolution code into different processor architecture.
• Update the application module chapter in the programming guide, and change it into dynamic module chapter.
• Overwrite the exit() function of newlib to take over the processing of exit for dlmodule.
• Add SAL (Socket Abstraction Layer) components for adapting different protocol stacks and network implementations, and update the relevant sections of the programming guide;
• Add AT components, including AT client, AT server and AT Socket function;
• Remove the poll/select API of DFS_NET and move them to SAL component.
• Remove the strong dependence of lwIP component of DFS_NET and replace it with Kconfig configuration of lwIP component support in SAL.
• Add the DHCP server function with lwIP raw API;
• Fix the wait queue none-initialization issue in socket allocation of lwIP.
• When a thread is about to block on a wait queue, fix the wake up issue for `rt_wqueue_wakeup' is executed to wake up that thread;
• Add the PWM driver framework;
• Fix the sdio_irq_wakeup release issue in the MMC/SD framework.
• Fix the problem of DMA handling in the serial driver framework.
• Update SFUD to v1.0.6 version;

BSP

• Fix the SP issue when hard fault occurs for ARM Cortex-M arch;
• Add C-Sky CK802 architecture porting;
• Add Realtek amebaz WiFi SOC (rtl8710bn) BSP;
• Update imxrt1052-evk firmware SDK to support B model chip.
• Fix the copying packets issue in the Godson 1C BSP when sending the NIC driver message.
• The new Tang m05x/m451 BSP are changed into the main() entry mode, and supports GCC compilation;
• Fix the inconsistency issue between touch range and LCD resolution in qemu-vexpress-a9.
• Add qemu-vexpress-gemini BSP for dual core A9 (RT-Thread + Linux) arch;
• Add the basic porting for Raspberry Pi 2B ;
• Add CAN and PWM drivers in stm32f4xx-HAL BSP;
• Optimize the GPIO driver in stm32f4xx-HAL BSP;
• Add UART3 driver in stm32f4xx-HAL BSP;
• Fix the I2C1 driver clock in stm32f10x BSP and WDG control interface.
• Add rt_hw_us_delay interface in stm32f10x-HAL BSP;
• Optimize the GPIO driver in stm32f10x-HAL BSP;
• Add GPIO driver and RTC driver in stm32f107 BSP;

Tool

• ENV update to v1.0.0 final version.
• ENV added the China mirror for software package, which can speed up the software package download, update etc.
• Fix the ENV known bugs and enhance the interaction with users.
• Add building script to detect the version of GCC & newlib;
• Add building script to detect the version of armcc;
• Add scons --dist function to make distribution for a BSP.
• Add `scons - dist - strip' function to make a minimal files of distribution for a BSP.
• Add `ASFLAGS/LOCAL_ASFLAGS' parameters for defined a group and pass parameters to assembler;
• Fix some errors in building script under the Linux environment.
• Add the C-Sky CDK IDE project generation.
• Add scons --target=vsc -s to generate friendly configuration files for VSCode;