STM32F207 DMA发送出错

zhcy周 · 发表于 2016-12-29 20:19:42

#define UART_RX_LEN    5
u8 Uart_Send_Buffer[UART_RX_LEN] ={0x12,0x34,0x56,0x78,0x90};

使用DMA发送串口数据，PC上面的串口调试助手显示为28 F6 00 20 31，今天刚入手学习DMA很多地方不懂，麻烦大神抽空看看DMA配置是否有问题，不胜感激，谢谢

void DMA_Configuration(void)
{
      DMA_InitTypeDef DMA_InitStructure;

      /* DMA clock enable */
      RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);//DMA2

      /* DMA1 Channel4 (triggered by USART1 Tx event) Config */ //DMA2 Stream 7 Channel 4
      DMA_DeInit(DMA2_Stream7);
      DMA_InitStructure.DMA_Channel = DMA_Channel_4;
      DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)(&USART1->DR);
      DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)Uart_Send_Buffer;
      DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;
      DMA_InitStructure.DMA_BufferSize = 5;
      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_High;

      DMA_Init(DMA2_Stream7, &DMA_InitStructure);
      DMA_ITConfig(DMA2_Stream7, DMA_IT_TC, ENABLE);
      DMA_ITConfig(DMA2_Stream7, DMA_IT_TE, ENABLE);

      /* Enable USART1 DMA TX request */
      USART_DMACmd(USART1, USART_DMAReq_Tx, ENABLE);
      DMA_ClearFlag(DMA2_Stream7, DMA_FLAG_TCIF7);
      DMA_Cmd(DMA2_Stream7, DISABLE);
}

zhcy周 · 发表于 2016-12-29 20:20:32

呼叫原子哥，管用嘛

zhcy周 · 发表于 2016-12-29 20:26:06

GPIO及USART配置：

void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;

/* Enable GPIOA and USART1 clock */

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);

/* Connect PXx to USARTx_Tx*/
GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_USART1);
/* Connect PXx to USARTx_Rx*/
GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_USART1);
/* Configure USART Tx as alternate function */
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Configure USART Rx as alternate function */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}

void USART_Configuration(void)
{
USART_InitTypeDef USART_InitStructure;
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;
USART_Init(USART1, &USART_InitStructure);

USART_ITConfig(USART1, USART_IT_IDLE , ENABLE); //¿ÕÏDÖD¶Ï
USART_Cmd(USART1, ENABLE);//ê1ÄüUSART
}

zhcy周 · 发表于 2016-12-29 20:32:34

中断配置
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;

/* Configure one bit for preemption priority */
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);

/* Enable the USART1 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream7_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

}