两块stm32 spi通信，使用DMA

本例程主要是用于两块stm32之间的spi通信，用到了ＤＭＡ节省了ｃｐｕ的的时间，大大提高了ｃｐｕ的利用率

/**************************************************************************//**
 * @file     core_cm3.c
 * @brief    CMSIS Cortex-M3 Core Peripheral Access layer Source File
 * @version  V1.30
 * @date     30. October 2009
 *
 * @note
 * Copyright （C） 2009 ARM Limited. All rights reserved.
 *
 * @par
 * ARM Limited （ARM） is supplying this software for use with Cortex-M 
 * processor based microcontrollers.  This file can be freely distributed 
 * within development tools that are supporting such ARM based processors. 
 *
 * @par
 * THIS SOFTWARE IS PROVIDED “AS IS“.  NO WARRANTIES WHETHER EXPRESS IMPLIED
 * OR STATUTORY INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
 * ARM SHALL NOT 

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2011-12-01 15:30  DMA\
     目录           0  2011-12-01 15:30  DMA\Libraries\
     目录           0  2011-12-01 15:30  DMA\Libraries\CMSIS\
     目录           0  2011-12-01 15:30  DMA\Libraries\CMSIS\CM3\
     目录           0  2011-12-01 15:30  DMA\Libraries\CMSIS\CM3\CoreSupport\
     文件       17273  2010-10-18 20:09  DMA\Libraries\CMSIS\CM3\CoreSupport\core_cm3.c
     文件       85714  2010-10-18 20:09  DMA\Libraries\CMSIS\CM3\CoreSupport\core_cm3.h
     目录           0  2011-12-01 15:30  DMA\Libraries\CMSIS\CM3\DeviceSupport\
     目录           0  2011-12-01 15:30  DMA\Libraries\CMSIS\CM3\DeviceSupport\ST\
     目录           0  2011-12-01 15:30  DMA\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\
     目录           0  2011-12-01 15:30  DMA\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\
     目录           0  2011-12-01 15:30  DMA\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\arm\
     文件       15763  2010-10-18 20:09  DMA\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\arm\startup_stm32f10x_cl.s
     文件       15500  2010-10-18 20:09  DMA\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\arm\startup_stm32f10x_hd.s
     文件       15767  2010-10-18 20:09  DMA\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\arm\startup_stm32f10x_hd_vl.s
     文件       12373  2010-10-18 20:09  DMA\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\arm\startup_stm32f10x_ld.s
     文件       13653  2010-10-18 20:09  DMA\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\arm\startup_stm32f10x_ld_vl.s
     文件       12762  2010-10-18 20:09  DMA\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\arm\startup_stm32f10x_md.s
     文件       14070  2010-10-18 20:09  DMA\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\arm\startup_stm32f10x_md_vl.s
     文件       15952  2010-10-18 20:09  DMA\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\arm\startup_stm32f10x_xl.s
     目录           0  2011-12-01 15:30  DMA\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\gcc_ride7\
     文件       12955  2010-10-18 20:09  DMA\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\gcc_ride7\startup_stm32f10x_cl.s
     文件       13042  2010-10-18 20:09  DMA\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\gcc_ride7\startup_stm32f10x_hd.s
     文件       12451  2010-10-18 20:09  DMA\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\gcc_ride7\startup_stm32f10x_hd_vl.s
     文件        9698  2010-10-18 20:09  DMA\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\gcc_ride7\startup_stm32f10x_ld.s
     文件       10445  2010-10-18 20:09  DMA\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\gcc_ride7\startup_stm32f10x_ld_vl.s
     文件       10154  2010-10-18 20:09  DMA\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\gcc_ride7\startup_stm32f10x_md.s
     文件       10941  2010-10-18 20:09  DMA\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\gcc_ride7\startup_stm32f10x_md_vl.s
     文件       13143  2010-10-18 20:09  DMA\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\gcc_ride7\startup_stm32f10x_xl.s
     目录           0  2011-12-01 15:30  DMA\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\iar\
     文件       16629  2010-10-18 20:09  DMA\Libraries\CMSIS\CM3\DeviceSupport\ST\STM32F10x\startup\iar\startup_stm32f10x_cl.s
............此处省略102个文件信息