DMA to USART (UART) (IN OUT)

Прием - передача по USART1 с использованием DMA



//    USART/DMA_Polling
#include "stm32f10x.h"
#include "platform_config.h"

/* Private variables ---------------------------------------------------------*/
USART_InitTypeDef USART_InitStructure;
uint8_t TxBuffer[16];
uint8_t RxBuffer[16];

/* Private function prototypes -----------------------------------------------*/
void RCC_Configuration(void);
void GPIO_Configuration(void);
void DMA_Configuration(void);

int main(void)
{
  /* System Clocks Configuration */
  RCC_Configuration();
  /* Configure the GPIO ports */
  GPIO_Configuration();
  /* Configure the DMA */
  DMA_Configuration();

/* USARTy and USARTz configuration ------------------------------------------------------*/
  /* USARTy and USARTz configured as follow:
        - BaudRate = 230400 baud
        - Word Length = 8 Bits
        - One Stop Bit
        - No parity
        - Hardware flow control disabled (RTS and CTS signals)
        - Receive and transmit enabled
  */
  USART_InitStructure.USART_BaudRate = 115200;
  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;

  /* Configure USARTy */
  USART_Init(USART1, &USART_InitStructure);

  /* Enable USARTy DMA Rx and TX request */
  USART_DMACmd(USART1, USART_DMAReq_Rx | USART_DMAReq_Tx, ENABLE);

  /* Enable USARTy TX DMA1 Channel */
DMA_Cmd(DMA1_Channel4, ENABLE);
  /* Enable USARTy RX DMA1 Channel */
DMA_Cmd(DMA1_Channel5, ENABLE);

  /* Enable the USART*/
  USART_Cmd(USART1, ENABLE);

  /* Wait until USARTy TX DMA1 Channel Transfer Complete */
  while (DMA_GetFlagStatus(USARTy_Tx_DMA_FLAG) == RESET)
  {
  }
  /* Wait until USARTy RX DMA1 Channel Transfer Complete */
  while (DMA_GetFlagStatus(USARTy_Rx_DMA_FLAG) == RESET)
  {
  }

  while (1)
  {
  }
}

void RCC_Configuration(void)
{
  /* DMA clock enable */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

  /* Enable GPIO clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);

  /* Enable USART1 Clock */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
}

void GPIO_Configuration(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;

  /* Configure USARTy Rx as input floating */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
 
  /* Configure USARTy Tx as alternate function push-pull */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
}


void DMA_Configuration(void)
{
  DMA_InitTypeDef DMA_InitStructure;

  /* USARTy TX DMA1 Channel (triggered by USARTy Tx event) Config */
  DMA_DeInit(DMA1_Channel4);
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&USART1->DR;//0x40013804;
  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)TxBuffer;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
  DMA_InitStructure.DMA_BufferSize = 16;
  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_Normal;
  DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
  DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
  DMA_Init(DMA1_Channel4, &DMA_InitStructure);

  /* USARTy RX DMA1 Channel (triggered by USARTy Rx event) Config */
  DMA_DeInit(DMA1_Channel5);
  DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&USART1->DR;//0x40013804;
  DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)RxBuffer;
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
  DMA_InitStructure.DMA_BufferSize = 16;
  DMA_Init(DMA1_Channel5, &DMA_InitStructure);
}