fix cdc_vcom.c notify receive data.

cdc_vcom dma 发送流程修改

[Components][Drivers][USB Device]fix ep assign bug

* [Components] driver usb vcom fix error for console

修复一个 bug 该bug曾导致在设备不断电但主机重新枚举设备的情况下会导致内存泄漏并无法接收数据

1. Use float type for clock_cpu_getres() return value;
2. Add clock_cpu_microsecond/millisecond APIs.

可以挂U盘了 欢迎测试鲁棒性已打通F4全系列HOST驱动（OTGFS）

without finsh]

[DeviceDriver][Serial] Fix serial open flag lost when device reopen.

协议栈增加允许class在windows环境下枚举时向系统注册附加属性。并在winusb class中提供范例（注册GUID信息）

Core]修复了协议栈在ep0请求大于端点描述最大包时无法正确读取的bug
增加了rndis class LWIP on USB

Windows下没驱动 linux和mac下免驱

Fix compile error when RT_USING_POSIX_TERMIOS is not define.

1.Fix poll rx issue when data is full.
2.Add TCFLSH and FIONREAD support.

[Mod] Modify wifi_usage help message

There is a memory leak issue when close a pipe.

[Add] Change network_mode value according to the finsh shell command

data bits should get from CSIZE.

[wlan cmd][lwip ip addr] modify

[DeviceDrivers]添加pin开漏和下拉输入宏

[DeviceDrivers]添加pin开漏和下拉输入宏

This reverts commit cfa87cf938.

[drv][mmcsd] Undo Changes.

增加了pin设备的模式开漏和下拉
添加的HAL库的bsp分支

[drv][mmcsd] Add component initial.

1. Add macro check in rtdebug.h;
2. Use RT_USING_POSIX for poll/select, stdin etc.
3. Split dfs_posix.h to dfs_posix.h, dfs_poll.h and dfs_select.h;

1. Change 'rt_uint8_t' type of cmd to 'int';
2. Add waitqueue;
3. Split device ipc header files;

[Device Drivers] delete an useless %s.

[BSP] stm32f10x add watchdog driver

[DeviceDrivers] Add audio driver.

Fix a bug in function sdio_unregister_driver

[DeviceDrivers] pin: add irq APIs.

修复I2C读写函数，I2C传输失败时返回成功的问题

uart configure shall not been performed if uart is not open.

Improve serial DMA rx mode. #628

patched by FH.

Add MMC/SD change support, which patched by FH.

function `rt_pin_write` is invoked by  function `can_bus_hook`, and it should to be initialized by gpio.c.
but gpio.c was not added in SConscript

fix reset serial receive interrupt flag when close serial

[DeviceDrivers] Add hardware timer framework

add w25q80 support to spi flash

Remove dataqueue/pipe if not enable RT_USING_HEAP, supply the missing `not`.

fix: completion wait after, maybe can't clean the flag.

[BSP] Correct pin register name problems

[Driver/ringbuffer]: Fix put_force bug

OXape reports: http://www.rt-thread.org/phpBB3/topic3939.html
          driver/ringbuffer: when data length is bigger than space length
          for rb, the read_index in rb is not update.
    When length > space, update the read_index, the bug can be fix, and
          works fine.

2. Fix data transfer size calculate error issue;

2.adjust some viable and micro name
3.some other small fix

This reverts commit 5aeedc4f3a, reversing
changes made to 3d80e414ff.

This merge breaks every uart driver in all BSPs. @bright-pan , is there
any way to get this done without breaking existing code?

Add hardware flow support.
Use new struct serial_ringbuffer.

Pass USB CV test verification;
Code cleanup;