#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);
}
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