STM32F407VET 基于DDS 用内置DAC实现实现多种波形输出，频率可调：范围1HZ-5MHZ

STM32F407VET.基于DDS 用内置DAC实现多种波形（正弦 方波 三角波 锯齿波）输出，支持频率可调 （范围1HZ-5MHZ 在5MHz下精度大约100khz左右） 有自定义波形功能

/**
  ******************************************************************************
  * @file    misc.c
  * @author  MCD Application Team
  * @version V1.4.0
  * @date    04-August-2014
  * @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  2017-10-30 13:15  20_DDS_创新\
     目录           0  2017-10-30 13:15  20_DDS_创新\CORE\
     文件      109142  2014-07-17 21:52  20_DDS_创新\CORE\core_cm4.h
     文件       22735  2014-07-17 21:52  20_DDS_创新\CORE\core_cm4_simd.h
     文件       17146  2014-07-17 21:52  20_DDS_创新\CORE\core_cmFunc.h
     文件       20513  2014-07-17 21:52  20_DDS_创新\CORE\core_cmInstr.h
     文件       29605  2014-08-02 00:12  20_DDS_创新\CORE\startup_stm32f40_41xxx.s
     目录           0  2017-10-30 13:15  20_DDS_创新\DSP_LIB\
     目录           0  2017-10-30 13:15  20_DDS_创新\DSP_LIB\Include\
     文件        4676  2014-07-17 21:52  20_DDS_创新\DSP_LIB\Include\arm_common_tables.h
     文件        3666  2014-07-17 21:52  20_DDS_创新\DSP_LIB\Include\arm_const_structs.h
     文件      242444  2014-07-17 21:52  20_DDS_创新\DSP_LIB\Include\arm_math.h
     文件       33042  2014-07-17 21:52  20_DDS_创新\DSP_LIB\Include\core_cm0.h
     文件       40429  2014-07-17 21:52  20_DDS_创新\DSP_LIB\Include\core_cm0plus.h
     文件       99832  2014-07-17 21:52  20_DDS_创新\DSP_LIB\Include\core_cm3.h
     文件      109142  2014-07-17 21:52  20_DDS_创新\DSP_LIB\Include\core_cm4.h
     文件       22735  2014-07-17 21:52  20_DDS_创新\DSP_LIB\Include\core_cm4_simd.h
     文件       17146  2014-07-17 21:52  20_DDS_创新\DSP_LIB\Include\core_cmFunc.h
     文件       20513  2014-07-17 21:52  20_DDS_创新\DSP_LIB\Include\core_cmInstr.h
     文件       41744  2014-07-17 21:52  20_DDS_创新\DSP_LIB\Include\core_sc000.h
     文件       98211  2014-07-17 21:52  20_DDS_创新\DSP_LIB\Include\core_sc300.h
     文件    11673458  2013-11-07 11:55  20_DDS_创新\DSP_LIB\arm_cortexM4lf_math.lib
     目录           0  2017-10-30 13:15  20_DDS_创新\FWLIB\
     目录           0  2017-10-30 13:15  20_DDS_创新\FWLIB\inc\
     文件        6924  2014-08-01 23:18  20_DDS_创新\FWLIB\inc\misc.h
     文件       32880  2014-08-01 23:18  20_DDS_创新\FWLIB\inc\stm32f4xx_adc.h
     文件       27318  2014-08-01 23:18  20_DDS_创新\FWLIB\inc\stm32f4xx_can.h
     文件        2416  2014-08-01 23:18  20_DDS_创新\FWLIB\inc\stm32f4xx_crc.h
     文件       14481  2014-08-01 23:18  20_DDS_创新\FWLIB\inc\stm32f4xx_cryp.h
     文件       14946  2014-08-01 23:18  20_DDS_创新\FWLIB\inc\stm32f4xx_dac.h
     文件        4296  2014-08-01 23:18  20_DDS_创新\FWLIB\inc\stm32f4xx_dbgmcu.h
............此处省略272个文件信息