STM32F4移植GRBL V1.1版本

移植GRBL最新的V1.1版本，MDK编译无报错，有些警告，无大碍。仅供大家学习使用。

/**
  ******************************************************************************
  * @file    misc.c
  * @author  MCD Application Team
  * @version V1.8.0
  * @date    04-November-2016
  * @brief   This file provides all the miscellaneous firmware functions （add-on
  *          to CMSIS functions）.
  *          
  *  @verbatim   
  *                               
  *          ===================================================================      
  *                        How to configure Interrupts using driver 
  *          ===================================================================      
  * 
  *            This section provide functions allowing to configure the NVIC interrupts （IRQ）.
  *            The Cortex-M4 exceptions are managed by CMSIS functions.
  *
  *            1. Configure the NVIC Priority Grouping using NVIC_PriorityGroupConfig（）
  *                function according to the following table.
 
  *  The table below gives the allowed values of the pre-emption priority and subpriority according
  *  to the Priority Grouping configuration performed by NVIC_PriorityGroupConfig function
  *    ==========================================================================================================================
  *      NVIC_PriorityGroup   | NVIC_IRQChannelPreemptionPriority | NVIC_IRQChannelSubPriority  |       Description
  *    ==========================================================================================================================
  *     NVIC_PriorityGroup_0  |                0                  |            0-15             | 0 bits for pre-emption priority
  *                           |                                   |                             | 4 bits for subpriority
  *    --------------------------------------------------------------------------------------------------------------------------
  *     NVIC_PriorityGroup_1  |                0-1                |            0-7              | 1 bits for pre-emption priority
  *                           |                                   |                             | 3 bits for subpriority
  *    --------------------------------------------------------------------------------------------------------------------------    
  *     NVIC_PriorityGroup_2  |                0-3                |            0-3              | 2 bits for pre-emption priority
  *                           |                                   |                             | 2 bits for subpriority
  *    --------------------------------------------------------------------------------------------------------------------------    
  *     NVIC_PriorityGroup_3  |                0-7                |            0-1              | 3 bits for pre-emption priority
  *                           |                                   |                             | 1 bits for subpriority
  *    ----------------------------------------------------------------------------------

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2018-09-26 14:01  stm32f4-GrblV1.1\
     目录           0  2018-09-18 14:29  stm32f4-GrblV1.1\CORE\
     文件        1085  2018-07-17 02:23  stm32f4-GrblV1.1\CORE\arm_common_tables.h
     文件      233275  2018-07-17 02:23  stm32f4-GrblV1.1\CORE\arm_math.h
     文件       77903  2018-07-17 02:23  stm32f4-GrblV1.1\CORE\core_cm4.h
     文件       23278  2018-07-17 02:23  stm32f4-GrblV1.1\CORE\core_cm4_simd.h
     文件       15082  2018-07-17 02:23  stm32f4-GrblV1.1\CORE\core_cmFunc.h
     文件       15523  2018-07-17 02:23  stm32f4-GrblV1.1\CORE\core_cmInstr.h
     目录           0  2018-09-18 14:29  stm32f4-GrblV1.1\FWLIB\
     目录           0  2018-09-18 14:29  stm32f4-GrblV1.1\FWLIB\inc\
     文件        6748  2018-07-17 02:23  stm32f4-GrblV1.1\FWLIB\inc\misc.h
     文件       32352  2018-07-17 02:23  stm32f4-GrblV1.1\FWLIB\inc\stm32f4xx_adc.h
     文件       27192  2018-07-17 02:23  stm32f4-GrblV1.1\FWLIB\inc\stm32f4xx_can.h
     文件        2335  2018-07-17 02:23  stm32f4-GrblV1.1\FWLIB\inc\stm32f4xx_crc.h
     文件       14099  2018-07-17 02:23  stm32f4-GrblV1.1\FWLIB\inc\stm32f4xx_cryp.h
     文件       14644  2018-07-17 02:23  stm32f4-GrblV1.1\FWLIB\inc\stm32f4xx_dac.h
     文件        4189  2018-07-17 02:23  stm32f4-GrblV1.1\FWLIB\inc\stm32f4xx_dbgmcu.h
     文件       12667  2018-07-17 02:23  stm32f4-GrblV1.1\FWLIB\inc\stm32f4xx_dcmi.h
     文件       28275  2018-07-17 02:23  stm32f4-GrblV1.1\FWLIB\inc\stm32f4xx_dma.h
     文件        7932  2018-07-17 02:23  stm32f4-GrblV1.1\FWLIB\inc\stm32f4xx_exti.h
     文件       24595  2018-07-17 02:23  stm32f4-GrblV1.1\FWLIB\inc\stm32f4xx_flash.h
     文件       28677  2018-07-17 02:23  stm32f4-GrblV1.1\FWLIB\inc\stm32f4xx_gpio.h
     文件        9829  2018-07-17 02:23  stm32f4-GrblV1.1\FWLIB\inc\stm32f4xx_hash.h
     文件       31228  2018-07-17 02:23  stm32f4-GrblV1.1\FWLIB\inc\stm32f4xx_i2c.h
     文件        4194  2018-07-17 02:23  stm32f4-GrblV1.1\FWLIB\inc\stm32f4xx_iwdg.h
     文件        9372  2018-07-17 02:23  stm32f4-GrblV1.1\FWLIB\inc\stm32f4xx_pwr.h
     文件       50026  2018-07-17 02:23  stm32f4-GrblV1.1\FWLIB\inc\stm32f4xx_rcc.h
     文件        4161  2018-07-17 02:23  stm32f4-GrblV1.1\FWLIB\inc\stm32f4xx_rng.h
     文件       40041  2018-07-17 02:23  stm32f4-GrblV1.1\FWLIB\inc\stm32f4xx_rtc.h
     文件       22243  2018-07-17 02:23  stm32f4-GrblV1.1\FWLIB\inc\stm32f4xx_sdio.h
     文件       20631  2018-07-17 02:23  stm32f4-GrblV1.1\FWLIB\inc\stm32f4xx_spi.h
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