1. u8 gprsTxBuf[100];
   
2. u8 gprsRxBuf[1500];
   
3. //接收DMA初始化
   
4. void tx_dma_init(void)
   
5. {
   
6.         DMA_InitTypeDef         DMA_InitStructure;
   
7.        
   
8.         RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
   
9.        
   
10.         DMA_Cmd(DMA1_Channel7, DISABLE);  
    
11.         DMA_DeInit(DMA1_Channel7);
    
12.         DMA_InitStructure.DMA_BufferSize=sizeof(gprsTxBuf);                                //ÏÈÉèÖÃΪ1K´óС
    
13.         DMA_InitStructure.DMA_DIR=DMA_DIR_PeripheralDST;
    
14.         DMA_InitStructure.DMA_M2M=DMA_M2M_Disable;               
    
15.         DMA_InitStructure.DMA_MemoryBaseAddr=(uint32_t)gprsTxBuf;
    
16.         DMA_InitStructure.DMA_MemoryDataSize=DMA_MemoryDataSize_Byte;
    
17.         DMA_InitStructure.DMA_MemoryInc=DMA_MemoryInc_Enable;
    
18.         DMA_InitStructure.DMA_Mode=DMA_Mode_Normal;
    
19.         DMA_InitStructure.DMA_PeripheralBaseAddr=(u32)&USART2->DR;
    
20.         DMA_InitStructure.DMA_PeripheralDataSize=DMA_PeripheralDataSize_Byte;
    
21.         DMA_InitStructure.DMA_PeripheralInc=DMA_PeripheralInc_Disable;
    
22.         DMA_InitStructure.DMA_Priority=DMA_Priority_High;
    
23.         DMA_Init(DMA1_Channel7,&DMA_InitStructure);                //³õʼ»¯TXµÄDMA
    
24. }
    
25. //发送DMA初始化
    
26. void rx_dma_init(void)
    
27. {
    
28.         DMA_InitTypeDef DMA_InitStructure;
    
29. 
    
30.         RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
    
31.         DMA_InitStructure.DMA_PeripheralBaseAddr = USART_DR_ADDRESS;
    
32.         DMA_InitStructure.DMA_MemoryBaseAddr = (u32)gprsRxBuf;
    
33.         DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
    
34.         DMA_InitStructure.DMA_BufferSize = sizeof(gprsRxBuf);
    
35.         DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
    
36.         DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
    
37.         DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
    
38.         DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;         
    
39.         DMA_InitStructure.DMA_Mode = DMA_Mode_Normal ;
    
40.         DMA_InitStructure.DMA_Priority = DMA_Priority_High;
    
41.         DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;          
    
42.         DMA_Init(DMA1_Channel6, &DMA_InitStructure);
    
43.         DMA_Cmd (DMA1_Channel6,ENABLE);
    
44. }
    
45. 
    
46. 
    
47. //串口初始化
    
48. void uart_init(void)
    
49. {
    
50.         GPIO_InitTypeDef   GPIO_InitStructure;   
    
51.         USART_InitTypeDef  USART_InitStructure;         
    
52.         NVIC_InitTypeDef   NVIC_InitStructure;       
    
53.        
    
54.         RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA        , ENABLE);
    
55.         RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO,ENABLE);
    
56.         RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
    
57.        
    
58.         GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
    
59.         GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    
60.         GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    
61.         GPIO_Init(GPIOA, &GPIO_InitStructure);
    
62.        
    
63.         GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
    
64.         GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    
65.         GPIO_Init(GPIOA, &GPIO_InitStructure);
    
66.        
    
67.         NVIC_InitStructure.NVIC_IRQChannel=USART2_IRQn;
    
68.         NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3;
    
69.         NVIC_InitStructure.NVIC_IRQChannelSubPriority=0;
    
70.         NVIC_InitStructure.NVIC_IRQChannelCmd=ENABLE;
    
71.         NVIC_Init(&NVIC_InitStructure);
    
72.        
    
73.         USART_InitStructure.USART_BaudRate = 115200;
    
74.         USART_InitStructure.USART_WordLength = USART_WordLength_8b;       
    
75.         USART_InitStructure.USART_StopBits = USART_StopBits_1;
    
76.         USART_InitStructure.USART_Parity = USART_Parity_No;
    
77.         USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    
78.         USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
    
79.         USART_Init(USART2, &USART_InitStructure);
    
80.        
    
81.         USART_DMACmd(USART2,USART_DMAReq_Tx,ENABLE);
    
82.         USART_DMACmd(USART2,USART_DMAReq_Rx,ENABLE);
    
83.        
    
84.         USART_ClearFlag(USART2,USART_FLAG_RXNE);
    
85.         USART_ClearFlag(USART2, USART_FLAG_TC);
    
86.         USART_ITConfig(USART2,USART_IT_IDLE,ENABLE);
    
87.        
    
88.         USART_Cmd(USART2, ENABLE);
    
89. }
    
90. //DMA发送数据
    
91. void send_commend(u8 *buf,u16 size)
    
92. {
    
93.         memset(gprsTxBuf,0,100);
    
94.         memcpy(gprsTxBuf,buf,size);
    
95.        
    
96.         DMA_Cmd(DMA1_Channel7,DISABLE);
    
97.         DMA_SetCurrDataCounter(DMA1_Channel7,size);
    
98.         DMA_Cmd(DMA1_Channel7,ENABLE);
    
99. }
    
100. 
     
101. void gprs_dma_reset()
     
102. {
     
103.     DMA_Cmd(DMA1_Channel6, DISABLE );
     
104.     DMA_SetCurrDataCounter(DMA1_Channel6, sizeof(gprsRxBuf));
     
105.     DMA_Cmd(DMA1_Channel6, ENABLE);  
     
106. }
     
107. 
     
108. extern u8 gprsRecOverFlag;
     
109. extern u16 gprsRecCnt;
     
110. void USART2_IRQHandler(void)            
     
111. {
     
112. 
     
113.         u16 uartRecCnt=0;
     
114. 
     
115.         if(USART_GetITStatus(USART2, USART_IT_IDLE) != RESET)
     
116.         {
     
117.                 USART_ReceiveData(USART2);
     
118.                 uartRecCnt = sizeof(gprsRxBuf) - DMA_GetCurrDataCounter(DMA1_Channel6);
     
119.                 //**********************//
     
120.                 gprsRecOverFlag=1;
     
121.                 gprsRecCnt=uartRecCnt;
     
122.                 //*************************************//
     
123.                 gprs_dma_reset();              
     
124.                 USART_ClearITPendingBit(USART2,USART_IT_IDLE);   
     
125.         }
     
126. }
     
127. 
     
128. 
     
129. 
     

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