void USART_DMAinit(void)
{
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
/* Enable USART1, GPIOA, GPIOx and AFIO clocks */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);
/* Configure USART1 Rx (PA.10) as input floating */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
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);
USART_InitStructure.USART_BaudRate =38400;
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 USART1 */
USART_Init(USART1, &USART_InitStructure);
USART_DMACmd(USART1, USART_DMAReq_Rx | USART_DMAReq_Tx, ENABLE);
/* Enable the USART1 */
USART_Cmd(USART1, ENABLE);
/* DMA1 Channel4 (triggered by USART1 Tx event) Config */
DMA_DeInit(DMA1_Channel5);
DMA_InitStructure.DMA_PeripheralBaseAddr = USART1_DR_Base;
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)RxBuffer1;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = TxBufferSize2;
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_Mode_Normal;
DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel5, &DMA_InitStructure);
/* Enable DMA1 Channel5 */
//DMA_ITConfig(DMA1_Channel5, DMA_IT_TC, ENABLE);
DMA_Cmd(DMA1_Channel5, ENABLE);
}
大家能知道什么问题吗？
哈哈 前面两个 打开时钟的语句 竟然没起作用 放到别的地方就好了
害得我差点 把电脑砸了 怎么也找不出原因 是否您也遇到过？
但是为什么会这样呢？ 呼叫高手 |
楼主
标题置顶
标题高亮
