STM32F1 library function initializes Series: transmitting the serial DMA idle receiving _DMA

  1 void USART3_Configuration(void) //串口3配置---S
  2 {
  3 DMA_InitTypeDef DMA_InitStructure;
  4 USART_InitTypeDef USART_InitStructure;
  5 GPIO_InitTypeDef GPIO_InitStructure;
  6 NVIC_InitTypeDef NVIC_InitStructure;
  7 RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
  8 RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1|RCC_AHBPeriph_DMA2, ENABLE); 
  9 //USART1
 10 //TX
 11 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; 
 12GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
13 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
14 GPIO_Init (GPIOB, & GPIO_InitStructure);
15  // RX 
16 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; 
17 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD;
18 GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
19 GPIO_Init (GPIOB, & GPIO_InitStructure);
20  
21 DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t) & (USART3-> RT);
22 DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)_code_rece;
 23 DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
 24 DMA_InitStructure.DMA_BufferSize = 4000;
 25 DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
 26 DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
 27 DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; //HalfWord
 28 DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
 29 DMA_InitStructure.DMA_Mode = DMA_Mode_Circular ; // DMA_Mode_Normal 
 30 DMA_InitStructure.DMA_Priority = DMA_Priority_Medium; //DMA_Priority_Low DMA_Priority_Medium DMA_Priority_High
 31 DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
 32 DMA_Init(DMA1_Channel3, &DMA_InitStructure);
 33 
 34 DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&( USART3->DR);
 35 DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)_send_data;
 36 DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
 37 DMA_InitStructure.DMA_BufferSize = 14;
 38 DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
 39 DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
 40 DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; //HalfWord
 41 DMA_InitStructure.DMA_MemoryDataSize = DMA_PeripheralDataSize_Byte;
 42 DMA_InitStructure.DMA_Mode = DMA_Mode_Normal ; // DMA_Mode_Normal 
 43 DMA_InitStructure.DMA_Priority = DMA_Priority_Medium; //DMA_Priority_Low DMA_Priority_Medium DMA_Priority_High
 44 DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
 45 DMA_Init(DMA1_Channel2, &DMA_InitStructure);
 46 
 47 USART_OverSampling8Cmd (USART3, ENABLE); 
48 USART_InitStructure.USART_BaudRate = 460,800 ;
49 USART_InitStructure.USART_WordLength = USART_WordLength_8b;
50 USART_InitStructure.USART_StopBits = USART_StopBits_1;
51 USART_InitStructure.USART_Parity = USART_Parity_No;
52 USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
53 USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
54 USART_Init (USART3, & USART_InitStructure); 
55  
56  // NVIC设置,使能中断
57NVIC_PriorityGroupConfig (NVIC_PriorityGroup_1); // Select Interrupt packets. 1 
58  
59 NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn; // Select Interrupt Serial 3 
60 NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0 ; // preemptive interrupt priority level setting. 1 
61 is NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0 ; / / responsive to the interrupt priority. 1 
62 is NVIC_InitStructure.NVIC_IRQChannelCmd the eNABLE =; // enable interrupt 
63 is NVIC_Init (& NVIC_InitStructure);
 64 USART_ITConfig (USART3, USART_IT_IDLE, the eNABLE); // enable interrupts 
65  
66 USART_DMACmd(USART3,USART_DMAReq_Rx,ENABLE);
 67 USART_DMACmd(USART3,USART_DMAReq_Tx,ENABLE);
 68 DMA_Cmd(DMA1_Channel3, ENABLE);
 69 USART_Cmd(USART3, ENABLE); 
 70 USART3->SR;
 71 USART3->DR;
 72 }
 73 
 74 DmaSendDataProc( DMA1_Channel2, 14 );
 75 //开启一次DMA传输
 76 void DmaSendDataProc(DMA_Channel_TypeDef *DMA_Streamx,u16 ndtr) 
 77 { 
 78 
 79 DMA_Cmd(DMA_Streamx, DISABLE); //关闭DMA传输 
 80 
 81DMA_SetCurrDataCounter (DMA_Streamx, ndtr); // data traffic 
82  
83 DMA_Cmd (DMA_Streamx, the ENABLE); // open DMA transfer 
84  
85  }
 86  void USART3_IRQHandler ( void )     // sent by the client data 
87  {
 88  IF (USART_GetFlagStatus (USART3 , USART_FLAG_IDLE) == the SET) // RxNE a received flag byte, 
89  {
 90 DMA_Cmd (DMA1_Channel3, the DISABLE); // Close DMA output 
91 is  
92 usart2_num = 2000 - DMA1_Channel3 -> CNDTR; // Get read bytes
 93 // processing data 
94 DMA1_Channel3-> CNDTR = 2000 ; // refill 
95 DMA_Cmd (DMA1_Channel3, the ENABLE); // open DMA transfer 
96  }
 97  
98 USART_ClearITPendingBit (USART3, USART_IT_IDLE); // Clear the receive interrupt flag 
99 USART3- > the SR;
 100 USART3-> the DR;
 101  
102 }