添加 USB Audio Class

add stm32h743-st-nucleo bsp

[libcpu][arm] 修复因提前返回,导致sp指针不对称问题

[kernel][ipc] add send wait support for message queue

imxrt: Update for imxrt UART, SDRAM, ENET, PHY modules

windows下第一次录放音失败的原因是：第一录放音时 windows 会先连续发送开始、结束检测设备，然后才正式开始。线程来不及处理两次开始事件不会累积，最后导致直接结束，

[bsp][stm32][stm32f767-atk-apollo] Add LCD driver port

1. Add "drv_eth.c" for all imxrt platforms.
2. Add ksz8081 phy driver for imxrt1052-nxp-evk board.
3. Disable the LED demo in main.c file if enable the ENET
   and ksz8081 phy, because the PINs of LED and ksz8081
   reset are from the same GPIO.
4. Update the relevant Kconfig and Sconscript files.
Signed-off-by: NGavin Liu <gavin-liugang@outlook.com>

Add ramfs (8MB size) support for imxrt1052-nxp-evk board.
Signed-off-by: NGavin Liu <gavin-liugang@outlook.com>

1. Add sdram item in bsp/imxrt/imxrt1052-nxp-evk/board/Kconfig
2. Add sdram configuration header file for imxrt1052-nxp-evk
3. Update the sdram space assignment for memheap
Signed-off-by: NGavin Liu <gavin-liugang@outlook.com>

Add LPUART3 item in imxrt1052-nxp-evk Kconfig file to support
Arduino UART interface.
Signed-off-by: NGavin Liu <gavin-liugang@outlook.com>

Add PINs init function based on the selected UART port.

In general, user should configure all necessary PINs based on
the specific imxrt board in:
    bsp/imxrt/xxxx/board/MCUX_Config/pin_mux.c
There is a convenient GUI tool named MCUXpresso Config Tools,
it's free and can be obtained from NXP offical website. Open
the file:
    bsp/imxrt/imxrt1052-nxp-evk/board/MCUX_Config/MCUX_Config.mex
with MCUXpresso Config Tools, set the necessary PINs (or clocks)
and generate the new code of pin_mux.c (or clock_config.c), the
project can get right configurations based on specific imxrt
board.

But, there is no relation between RT-Thread Kconfig and MCUXpresso
Config Tools. User selects one driver in RT-Thread menuconfig, then
the ping_mux.c should be udpated by MCUXpresso Config Tools to set
the right PIN configurations for the selected driver. It's clear
but a little complex.

We add the PIN init functions for some drivers in the board.c file,
1. It's convenient to usr a driver in RT-Thread. Just select the
   driver, then the code will include all necessary parts, and the
   driver can work well.
2. User can also configure the PINs with MCUXpresso Config Tools.
3. The drivers in bsp/imxrt/libraries/drivers are common for all
   imxrt boards. They may have different PIN configurations based
   on different hardware design. So we put the PIN init functions
   in each board.c file following each different imxrt board.
Signed-off-by: NGavin Liu <gavin-liugang@outlook.com>

修正rt_mp_free有可能唤醒一个错误任务指针的问题

bug fix: the value of timer auto reload should be (val-1)

[bsp][stm32][f796-disco]Add stm32f769-st-disco bsp

Signed-off-by: NWillian Chan <chentingwei@rt-thread.com>

Signed-off-by: NWillian Chan <chentingwei@rt-thread.com>

[tools]修正外部环境变量未引入Env Path,导致自定义Builder的action参数使用python函数时,无法找到外部程序的问题

[components/libc/compilers]c++文件引用libc.h支持

Fix STM32L0 Series External Interrupt BUG

[bsp][stm32][libraries]删除冲突的spi库文件，修正stm32f1系列的uuid读取函数

[bsp][stm32] 更新stm32f427-robomaster-a外设驱动配置

[bsp]解除组件初始化与使用user main的依赖，并修改相应的 Kconfig

[bsp][stm32] fix : #define HEAP_BEGIN

[net][netdev] fix IMEI spell mistake in ifconfig command

[tools]armclang库文件编译支持