#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);        
}