DMA+TIM_Burst

pearlh

1. void DMA_TIM1_Burst(void)         
   
2. {  
   
3.         /*!< At this stage the microcontroller clock setting is already configured,
   
4.        this is done through SystemInit() function which is called from startup
   
5.        file (startup_stm32f10x_xx.s) before to branch to application main.
   
6.        To reconfigure the default setting of SystemInit() function, refer to
   
7.        system_stm32f10x.c file
   
8.      */   
   
9.    GPIO_InitTypeDef         GPIO_InitStructure;
   
10.    DMA_InitTypeDef          DMA_InitStructure;
    
11.    TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
    
12.    TIM_OCInitTypeDef        TIM_OCInitStructure;       
    
13.    TIM_BDTRInitTypeDef      TIM_BDTRInitStructure;
    
14.        
    
15.   /* TIM1 and GPIOA clock enable */
    
16.   RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1 | RCC_APB2Periph_GPIOA| RCC_APB2Periph_GPIOB |RCC_APB2Periph_AFIO, ENABLE);
    
17. 
    
18.   /* DMA clock enable */
    
19.   RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
    
20.   
    
21.   /*channel1 ,channel2  --> PA.8,PA.9, PA.10*
    
22.         *channel1N,channel2N --> PB.13,PB.14, PB.15*/
    
23.   /* GPIOA Configuration: Channel 1 as alternate function push-pull */
    
24.   GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 ;
    
25.   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    
26.   GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    
27.   GPIO_Init(GPIOA, &GPIO_InitStructure);  
    
28. 
    
29.   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 |GPIO_Pin_14 | GPIO_Pin_15;
    
30.         GPIO_Init(GPIOB, &GPIO_InitStructure); //初始化GPIOB
    
31. 
    
32.   /* TIM1 DeInit */
    
33.   TIM_DeInit(TIM1);
    
34. 
    
35.   /* DMA1 Channel5 Config */
    
36.   DMA_DeInit(DMA1_Channel5);
    
37. 
    
38.   DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)TIM1_DMAR_ADDRESS;
    
39.   DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)SRC_Buffer;
    
40.   DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
    
41.   DMA_InitStructure.DMA_BufferSize = 6;
    
42.   DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
    
43.   DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
    
44.   DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
    
45.   DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
    
46.   DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
    
47.   DMA_InitStructure.DMA_Priority = DMA_Priority_High;
    
48.   DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
    
49.   DMA_Init(DMA1_Channel5, &DMA_InitStructure);
    
50.   
    
51.   /* Time base configuration */
    
52.   /* -----------------------------------------------------------------------
    
53.     TIM1 Configuration: generate 1 PWM signal using the DMA burst mode:
    
54.     The TIM1CLK frequency is set to SystemCoreClock (Hz), to get TIM1 counter
    
55.     clock at 24 MHz the Prescaler is computed as following:
    
56.      - Prescaler = (TIM1CLK / TIM1 counter clock) - 1
    
57.     SystemCoreClock is set to 72 MHz for Low-density, Medium-density, High-density
    
58.     and Connectivity line devices and to 24 MHz for Low-Density Value line and
    
59.     Medium-Density Value line devices
    
60. 
    
61.     The TIM1 period is 5.8 KHz: TIM1 Frequency = TIM1 counter clock/(ARR + 1)
    
62.                                                = 24 MHz / 4096 = 5.8KHz KHz
    
63.     TIM1 Channel1 duty cycle = (TIM1_CCR1/ TIM1_ARR)* 100 = 33.33%
    
64.   ----------------------------------------------------------------------- */  
    
65.   TIM_TimeBaseStructure.TIM_Period = 0xFFFF;         
    
66.   TIM_TimeBaseStructure.TIM_Prescaler = (uint16_t) (SystemCoreClock / 24000000) - 1;      
    
67.   TIM_TimeBaseStructure.TIM_ClockDivision = 0x0;   
    
68.   TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;   
    
69.   TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
    
70. 
    
71.   /* TIM Configuration in PWM Mode */
    
72.   TIM_OCInitStructure.TIM_OCMode =  TIM_OCMode_PWM1;   
    
73.   TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;         
    
74.   TIM_OCInitStructure.TIM_OutputNState=TIM_OutputNState_Enable;
    
75.         TIM_OCInitStructure.TIM_Pulse = 0xFFF;  
    
76. 
    
77.   TIM_OC1Init(TIM1, &TIM_OCInitStructure);
    
78.   TIM_OC2Init(TIM1, &TIM_OCInitStructure);
    
79.   TIM_OC3Init(TIM1, &TIM_OCInitStructure);
    
80. 
    
81.   /* TIM1 DMAR Base register and DMA Burst Length Config */
    
82.   TIM_DMAConfig(TIM1, TIM_DMABase_ARR, TIM_DMABurstLength_3Transfers);
    
83. 
    
84.   /* TIM1 DMA Update enable */
    
85.   TIM_DMACmd(TIM1, TIM_DMA_Update, ENABLE);
    
86.        
    
87.         /*死区和刹车功能配置*/
    
88.         TIM_BDTRInitStructure.TIM_OSSRState       = TIM_OSSRState_Enable;
    
89.         TIM_BDTRInitStructure.TIM_OSSIState       = TIM_OSSIState_Enable;
    
90.         TIM_BDTRInitStructure.TIM_LOCKLevel       = TIM_LOCKLevel_1;
    
91.         TIM_BDTRInitStructure.TIM_DeadTime        =50;                   //设置TIM1_BDTR的DTG，死区时间DTG[7:0]
    
92.         TIM_BDTRInitStructure.TIM_Break           = TIM_Break_Disable;
    
93.         TIM_BDTRInitStructure.TIM_BreakPolarity   = TIM_BreakPolarity_High;
    
94.         TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;
    
95.         TIM_BDTRConfig(TIM1, &TIM_BDTRInitStructure);
    
96. 
    
97.   /* TIM1 enable */
    
98.   TIM_Cmd(TIM1, ENABLE);
    
99.   
    
100.   /* TIM1 PWM Outputs Enable */
     
101.   TIM_CtrlPWMOutputs(TIM1, ENABLE);
     
102. 
     
103.   /* DMA1 Channel5 enable */
     
104.   DMA_Cmd(DMA1_Channel5, ENABLE);
     
105. 
     
106.   /* Wait until DMA1 Channel5 end of Transfer */
     
107.   while (!DMA_GetFlagStatus(DMA1_FLAG_TC5))
     
108.   {
     
109.   }
     
110. 
     
111.   /* Infinite loop */                                 
     
112. }

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这是分享呢？还是提问呢？
恕我眼拙，没看出问题来呀