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stm32f407的usart2之dma发送和接收，采用空闲中断。

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 楼主| keer_zu 发表于 2022-1-6 07:51 | 显示全部楼层 |阅读模式
DMA, stm32f407, usart2, ni, structure, struct

采用dma的usart2

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  1. static char usart2_dma_tx[256];
    

  2. unsigned char usart2_tx_busy_flag = 0;
    

  3. static char usart2_dma_rx[1024];
    

  4. unsigned char usart2_rx_busy_flag = 0;
    


  5. 


  6. 

  7. static void usart2_gpio_init(void)  
    

  8. {  
    

  9.         GPIO_InitTypeDef GPIO_InitStructure;  
    


  10. 

  11.         RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD,ENABLE);
    

  12.         
    

  13.         GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;  
    

  14.         GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;  
    

  15.         GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;  
    

  16.         GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;  
    

  17.         GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6; 
    

  18.         GPIO_Init(GPIOD, &GPIO_InitStructure);
    


  19. 

  20.         GPIO_PinAFConfig(GPIOD, GPIO_PinSource5, GPIO_AF_USART2);  
    

  21.         GPIO_PinAFConfig(GPIOD, GPIO_PinSource6, GPIO_AF_USART2);          
    

  22. }
    


  23. 

  24. static void usart2_usart_init(unsigned int bauderate, unsigned short wordLength, unsigned short stopBits, unsigned short Parity)
    

  25. {
    

  26.         USART_InitTypeDef USART_InitStructure;  
    


  27. 

  28.         RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
    

  29.         
    

  30.         USART_InitStructure.USART_BaudRate = bauderate;
    

  31.         USART_InitStructure.USART_WordLength = wordLength;  
    

  32.         USART_InitStructure.USART_StopBits = stopBits;  
    

  33.         USART_InitStructure.USART_Parity = Parity;
    

  34.         USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; 
    


  35. 

  36.         USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;  
    


  37. 

  38.         USART_Init(USART2, &USART_InitStructure);  
    

  39.         USART_Cmd(USART2, ENABLE);
    

  40.         USART_DMACmd(USART2,USART_DMAReq_Rx,ENABLE);
    


  41. 

  42.         //USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);
    

  43.         USART_ITConfig(USART2,USART_IT_RXNE,DISABLE);
    

  44.         USART_ITConfig(USART2, USART_IT_IDLE, ENABLE);
    

  45. }
    


  46. 

  47. static void uart2_dmarx_config(uint8_t *mem_addr, uint32_t mem_size)
    

  48. {
    

  49.         DMA_InitTypeDef DMA_InitStructure;
    

  50.  
    

  51.         //串口收DMA配置  
    

  52.         //启动DMA时钟
    

  53.     RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
    

  54.         //DMA通道配置
    

  55.         DMA_DeInit(DMA1_Stream5);
    

  56.         DMA_InitStructure.DMA_Channel = DMA_Channel_4;
    

  57.         //外设地址
    

  58.         DMA_InitStructure.DMA_PeripheralBaseAddr = (unsigned int)(&USART2->DR);
    

  59.         //内存地址
    

  60.         DMA_InitStructure.DMA_Memory0BaseAddr = (unsigned int)mem_addr;
    

  61.         //dma传输方向
    

  62.         DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
    

  63.         //设置DMA在传输时缓冲区的长度
    

  64.         DMA_InitStructure.DMA_BufferSize = mem_size;
    

  65.         //设置DMA的外设递增模式，一个外设
    

  66.         DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
    

  67.         //设置DMA的内存递增模式
    

  68.         DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
    

  69.         //外设数据字长
    

  70.         DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
    

  71.         //内存数据字长
    

  72.         DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
    

  73.         //设置DMA的传输模式
    

  74.         DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
    

  75.         //设置DMA的优先级别
    

  76.         DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
    

  77.         
    

  78.         //指定如果FIFO模式或直接模式将用于指定的流 ： 不使能FIFO模式  
    

  79.         DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;    
    

  80.         //指定了FIFO阈值水平
    

  81.         DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;        
    

  82.         //指定的Burst转移配置内存传输 
    

  83.         DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;       
    

  84.         //指定的Burst转移配置外围转移 */  
    

  85.         DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; 
    

  86.         
    

  87.         //配置DMA1的通道         
    

  88.         DMA_Init(DMA1_Stream5, &DMA_InitStructure);  
    

  89.         //使能通道
    

  90.         DMA_Cmd(DMA1_Stream5,ENABLE);
    

  91.         
    

  92.  
    

  93.         
    

  94.         USART_DMACmd(USART2,USART_DMAReq_Rx,ENABLE);
    


  95. 

  96. }
    


  97. 

  98. static void usart2_dma_init(void)  
    

  99. {  
    

  100.         DMA_InitTypeDef  DMA_InitStructure;  
    


  101. 

  102.         RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
    

  103.         
    

  104.         DMA_DeInit(DMA1_Stream6);                
    

  105.         DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;   
    

  106.         DMA_InitStructure.DMA_BufferSize = 256;   
    

  107.         DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;  
    

  108.         DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;  
    

  109.         DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;  
    

  110.         DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;  
    

  111.         DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;  
    

  112.         DMA_InitStructure.DMA_Priority = DMA_Priority_High;  
    

  113.         DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;  
    

  114.         DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_1QuarterFull;  
    

  115.         DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;  
    

  116.         DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; 
    


  117. 

  118.         DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&USART2->DR;         
    

  119.         DMA_InitStructure.DMA_Channel = DMA_Channel_4; 
    

  120.         DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)usart2_dma_tx;         
    


  121. 

  122.         DMA_Init(DMA1_Stream6, &DMA_InitStructure);                 
    

  123.         DMA_ITConfig(DMA1_Stream6, DMA_IT_TC, ENABLE);
    


  124. 

  125.         uart2_dmarx_config(usart2_dma_rx,1024);
    


  126. 

  127. }
    


  128. 

  129. static void usart2_nvic_init(void)  
    

  130. {  
    

  131.         NVIC_InitTypeDef NVIC_InitStructure;   
    


  132. 

  133.         NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 5;  
    

  134.         NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;  
    


  135. 

  136.         NVIC_InitStructure.NVIC_IRQChannel = DMA1_Stream6_IRQn; 
    

  137.         NVIC_Init(&NVIC_InitStructure);
    


  138. 

  139.         NVIC_InitStructure.NVIC_IRQChannel = DMA1_Stream5_IRQn; 
    

  140.         NVIC_Init(&NVIC_InitStructure);
    


  141. 

  142.         NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
    

  143.         NVIC_Init(&NVIC_InitStructure);        
    

  144. }  
    


  145. 

  146. void usart2_init(unsigned int bauderate, unsigned short wordLength, unsigned short stopBits, unsigned short Parity)
    

  147. {
    

  148.         usart2_nvic_init();
    

  149.         usart2_gpio_init();
    

  150.         usart2_usart_init(bauderate, wordLength, stopBits, Parity);
    

  151.         usart2_dma_init();
    

  152.         
    

  153. }
    


  154. 

  155. void usart2_send(char *buf, unsigned char len)
    

  156. {
    

  157.         while(usart2_tx_busy_flag)        delay_ms(2);
    

  158.         usart2_tx_busy_flag = 1;
    

  159.         printf("== dma tx\n");
    

  160.         memcpy(usart2_dma_tx, buf, len);
    

  161.         DMA_SetCurrDataCounter(DMA1_Stream6, len);
    

  162.         DMA_Cmd(DMA1_Stream6, ENABLE);                
    

  163.         USART_DMACmd(USART2, USART_DMAReq_Tx, ENABLE);
    

  164. }
    


  165. 

  166. /*****************USART2  TX******************/
    

  167. void DMA1_Stream6_IRQHandler(void)  
    

  168. {
    

  169.         printf("== %d dma 1-6\n",__LINE__);
    


  170. 

  171.         /* Test on DMA Stream Transfer Complete interrupt */  
    

  172.         if (DMA_GetITStatus(DMA1_Stream6, DMA_IT_TCIF6))  
    

  173.         {  
    

  174.                 /* Clear DMA Stream Transfer Complete interrupt pending bit */  
    

  175.                 DMA_ClearITPendingBit(DMA1_Stream6, DMA_IT_TCIF6); 
    

  176.                 USART_DMACmd(USART2, USART_DMAReq_Tx, DISABLE);        
    

  177.                 DMA_Cmd(DMA1_Stream6, DISABLE); 
    


  178. 

  179.                 usart2_tx_busy_flag = 0;                 
    

  180.         }
    

  181. }
    


  182. 

  183. /*****************USART2  RX******************/
    

  184. void DMA1_Stream5_IRQHandler(void)  
    

  185. {
    

  186.         printf("== %d dma rx\n",__LINE__);
    

  187.         /* Test on DMA Stream Transfer Complete interrupt */  
    

  188.         if (DMA_GetITStatus(DMA1_Stream5, DMA_IT_TCIF6))  
    

  189.         {  
    

  190.                 printf("== %d dma rx\n",__LINE__);
    

  191.                 /* Clear DMA Stream Transfer Complete interrupt pending bit */  
    

  192.                 DMA_ClearITPendingBit(DMA1_Stream5, DMA_IT_TCIF5); 
    

  193.                 USART_DMACmd(USART2, USART_DMAReq_Rx, DISABLE);        
    

  194.                 DMA_Cmd(DMA1_Stream5, DISABLE); 
    


  195. 

  196.                 usart2_rx_busy_flag = 0;                 
    

  197.         }
    

  198. }
    


  199. 


  200. 

  201. /*****************USART2  RX******************/
    

  202. void USART2_IRQHandler(void)
    

  203. {        
    

  204.         
    

  205.         unsigned char ch;
    

  206.         unsigned int temp;
    

  207.         int i;
    

  208.         unsigned short l;
    

  209.         /* USART in mode Sender   --------------------------------------------------*/
    

  210.         if(USART_GetITStatus(USART2, USART_IT_TXE) == SET)
    

  211.         {
    

  212.                 printf("== usart tx\n");
    

  213.                 USART_ClearITPendingBit(USART2, USART_IT_TXE);
    

  214.         }
    

  215.         
    

  216.         /* USART in mode Receiver --------------------------------------------------*/
    

  217.         //if(USART_GetITStatus(USART2, USART_IT_RXNE) == SET)
    

  218.         //{
    

  219.         //        USART_ClearITPendingBit(USART2, USART_IT_RXNE);
    

  220.         //        ch = USART_ReceiveData(USART2);                
    

  221.         //        printf("-%c",ch);
    

  222.         //} 
    

  223.         if(USART_GetITStatus(USART2, USART_IT_IDLE) != RESET) {
    

  224.                 USART2->SR;
    

  225.             USART2->DR; //清USART_IT_IDLE标志
    

  226.             DMA_Cmd(DMA1_Stream5,DISABLE);
    

  227.                 DMA_ClearFlag(DMA1_Stream5,DMA_FLAG_TCIF5);
    

  228.                 
    

  229.                 l = DMA_GetCurrDataCounter(DMA1_Stream5);
    

  230.                  printf("++ rx:%d\n",l);
    

  231.                 temp = 1024 - l;//DMA_GetCurrDataCounter(DMA1_Stream5);
    

  232.                 for (i = 0;i < temp;i++)
    

  233.                 {
    

  234.                          printf("%c",usart2_dma_rx[i]);
    

  235.                 }
    

  236.  
    

  237.                 //设置传输数据长度
    

  238.                 DMA_SetCurrDataCounter(DMA1_Stream5,1024);
    

  239.             //打开DMA
    

  240.                 DMA_Cmd(DMA1_Stream5,ENABLE);
    

  241.         }
    

  242. }
    


  243. 


  244.
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