interrupt problem for dma in usart

[mohamad_armoon]

Posted on March 09, 2014 at 16:58

hi guys, i wanna use interrupt for dma that i set for USART2 Rx/Tx  but i don't know how can i implement  intrrupt  functions , here is my code please tell me how can i use interrupt for Rx and Tx dma in my code:

#include ''stm32f4xx.h''void RCC_Configuration(void){  /* --------------------------- System Clocks Configuration -----------------*/  RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);   RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);}void GPIO_Configuration(void){  GPIO_InitTypeDef GPIO_InitStructure;   /*-------------------------- GPIO Configuration ----------------------------*/  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3;  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;  GPIO_Init(GPIOA, &GPIO_InitStructure);   GPIO_PinAFConfig(GPIOA, GPIO_PinSource2, GPIO_AF_USART2);  GPIO_PinAFConfig(GPIOA, GPIO_PinSource3, GPIO_AF_USART2);}void USART2_Configuration(void)    USART_IniTypeDef USART_InitStructure;  USART_InitStructure.USART_BaudRate = 9600;  USART_InitStructure.USART_WordLength = USART_WordLength_8b;  USART_InitStructure.USART_StopBits = USART_StopBits_1;  USART_InitStructure.USART_Parity = USART_Parity_No;  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;   USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;  USART_Init(USART2, &USART_InitStructure);  USART_Cmd(USART2, ENABLE);}uint8_t Rx_Buffer;void DMA_Rx_Configuration(void){  DMA_InitTypeDef  DMA_InitStructure;   DMA_DeInit(DMA1_Stream5);   DMA_InitStructure.DMA_Channel = DMA_Channel_4;  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory; // receive   DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&Rx_Buffer;  DMA_InitStructure.DMA_BufferSize = (uint16_t)sizeof(Rx_Buffer);  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&USART2->DR;  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;  DMA_InitStructure.DMA_Priority = DMA_Priority_High;  DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;  DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;  DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;  DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;   DMA_Init(DMA1_Stream5, &DMA_InitStructure);  USART_DMACmd(USART2, USART_DMAReq_Rx, ENABLE);  DMA_Cmd(DMA1_Stream5, ENABLE);}void init_LED(){  GPIO_InitTypeDef GPIO_InitStructure;  /*-------------------------- GPIO Configuration ----------------------------*/  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;  GPIO_Init(GPIOD, &GPIO_InitStructure);}uint8_t Tx_Buffer;void DMA_Tx_Configuration(){  DMA_InitTypeDef  DMA_InitStructure;  DMA_DeInit(DMA1_Stream6);   DMA_InitStructure.DMA_Channel = DMA_Channel_4;  DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral; // send   DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&Tx_Buffer;  DMA_InitStructure.DMA_BufferSize = (uint16_t)sizeof(Tx_Buffer);  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&USART2->DR;  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;  DMA_InitStructure.DMA_Priority = DMA_Priority_High;  DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;  DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;  DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;  DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;   DMA_Init(DMA1_Stream6, &DMA_InitStructure);   USART_DMACmd(USART2, USART_DMAReq_Tx, ENABLE);  DMA_Cmd(DMA1_Stream6, ENABLE);}int main(){RCC_Configuration();     GPIO_Configuration();     USART2_Configuration();     DMA_Rx_Configuration();    DMA_Tx_Configuration();        init_LED();      uint8_t temp = 0;  while(1){   temp = Rx_Buffer  ;  while(USART_GetFlagStatus(USART2, USART_FLAG_TXE) == RESET);     // USART_SendData(USART2, temp);  Tx_Buffer = Rx_Buffer;     if(temp > 0){       GPIO_SetBits(GPIOD,GPIO_Pin_12);       GPIO_SetBits(GPIOD,GPIO_Pin_13);     }  }}

[Tesla DeLorean]

Posted on March 09, 2014 at 17:15

https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/Flat.aspx?RootFolder=https://my.st.com/public/STe2ecommunities/mcu/Lists/cortex_mx_stm32/DMA%20Memory%20To%20UART5&FolderCTID=0x01200200770978C69A1141439FE559EB459D7580009C4E14902C3CDE46A77F0FFD06506F5B&currentviews=2585

DMA unit, channel, stream are impacted in a fashion described in RM0090