rt_ssize_t can give negative error code, which follows the unix style correctly

* [rtdef] rename RT_WEAK attribute as rt_weak

* [rtdef] rename RT_USED attribute as rt_used

* [rtdef] rename RT_SECTION attribute as rt_section

* [rtdef] rename ALIGN attribute as rt_align

* [legacy] add RT_USED ALIGN RT_SECTION RT_WEAK as legacy support

* fix usage of rt_event for drv_spi.c in renesas's libraries.

* add ra4m2 soc support, add sci spi support for ra4m2

* update ra4m2-eco/README.md

* update ra4m2-eco/README.md

* rename board picture name.

* reduce picture size, update README.md, remove file 'Target 1.bat'

* reduce picture size

* Synchronize the code of the rt mart branch to the master branch.
  * TTY device
  * Add lwP code from rt-smart
  * Add vnode in DFS, but DFS will be re-write for rt-smart
  * There are three libcpu for rt-smart:
    * arm/cortex-a, arm/aarch64
    * riscv64
Co-authored-by: NRbb666 <zhangbingru@rt-thread.com>
Co-authored-by: Nzhkag <zhkag@foxmail.com>

* 增加 野火 启明6M5 板级支持包

* 修复串口引脚描述错误

* 上一版提交，UART端口改了，但是uart编号漏改
Co-authored-by: NLiuxiequan <liuxiequan@cvte.com>

* 修改ry命令，已便于自定义保存路径

* modified:   components/utilities/ymodem/ry_sy.c

* 修复从被动错误恢复后发送返回异常

* 修复在自动重传模式下,ACK异常阻塞线程
- 删除TX中断函数else分支。仅当RQCP位 置一才进入该中断
- 添加SCE中断函数中关于ACK_ERR的else判断。自动重传模式下会进入该判断,打断自动重传释放完成量。

* 增加对于CAN1与CAN2的SCE中断和TX中断的公共处理函数

* formatting格式化代码

* update struct can_filter_item and rt_can_msg
1. 对过滤器号和索引号结构体定义中同一名称hdr进行重命名hdr_bank和hdr_index,
以便准确区分.采用宏定义兼容以前变量名.
2. 添加接收标识rxfifo,已指明是哪个RXFIFO.

* 更正42M下的波特率

* 修复接收获取索引号错误

* 添加接收标识

* 更新注释

* 取消CANFD限制

* update struct can_filter_item and rt_can_msg

* [add] 新增README文档说明

瑞萨RA6M4开发板对segger_rtt使用通知

* Update README.md
Co-authored-by: Man, Jianting (Meco) <920369182@qq.com>

* [renesas/ra2l1-cpk] add Captouch板载触摸按键配置说明.md

* Update Captouch板载触摸按键配置说明.md

* [renesas/drv_wdt.c] Fix error code issues
[renesas/drv_i2c.c] add hardware i2c driver

* [update] drv_wdt.c,drv_i2c.c
Co-authored-by: Man, Jianting (Meco) <920369182@qq.com>

* Add CANFD support and correct typos

- Added CANFD required fields to can.h
- Fixed typos in can.h and can.c
- Corrected all the projects affected by the typo
- Fixed wrong line-ending in some affected can driver files
Signed-off-by: NFan YANG <fan.yang@hpmicro.com>

* update
Signed-off-by: NFan YANG <fan.yang@hpmicro.com>
Co-authored-by: Meco Man <920369182@qq.com>

* [renesas/ra2l1-cpk] add Captouch板载触摸按键配置说明.md

* Update Captouch板载触摸按键配置说明.md
Co-authored-by: Man, Jianting (Meco) <920369182@qq.com>

[bsp/renesas] 更新flash、gpio驱动和配置头文件。更新FSP配置文档

* [rtc] use gmtime_r to replace gmtime

将路径更新为IAR最新版本的路径

因为不确定后续IAR是否会像Keil一样内含有不同的编译工具链
此外，将判断条件改为列表方式，这样更方便后续增加其他可能的IAR编译链

* [bsp/renesas/docs/] Add English documents

* [update] 添加 RA 系列 BSP 开发教程：
  - 添加 RA 系列 BSP 开发教程
  - 添加 ra6m4-iot PPP 上网
  - 整理 驱动文件

* [bsp/renesas] update docs/RA系列BSP制作教程.md

* [restore] Restore to the latest version

* [update] add fal component.

* [update] format code.

* [update] change PKG_USING_FAL to RT_USING_FAL

* [update] format code.

* [update] fal

* [update] delete FAL_SW_VERSION

- 添加 RA 系列 BSP 开发教程
  - 添加 ra6m4-iot PPP 上网
  - 整理 驱动文件