请问一下，谁有用过stm32f207的串口接收使用DMA的。我的初始化代码，发现能够进DMA中断，但是得到的数值是一直不变的。而且程序也不跑了。请问我哪里配置错了？
[mw_shl_code=c,true]void USART1_Configuration(void)
{
USART_InitTypeDef USART_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
//使能时钟
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, 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 USARTx_Tx as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Configure USARTx_Rx as input floating */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_Init(GPIOA, &GPIO_InitStructure);
USART_OverSampling8Cmd(USART1, ENABLE);
/* USARTx configuration ----------------------------------------------------*/
USART_InitStructure.USART_BaudRate = 115200;
USART_InitStructure.USART_WordLength = USART_WordLength_9b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_Odd;
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_RXNE, ENABLE);
/* DMA configuration ----------------------------------------------------*/
DMA_InitStructure.DMA_Channel = DMA_Channel_4;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructure.DMA_MemoryDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
DMA_DeInit(DMA2_Stream5);
DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)(&USART1->DR);
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)USART1_DR_Value;
DMA_InitStructure.DMA_BufferSize = 1;
DMA_Init(DMA2_Stream2, &DMA_InitStructure);
/* Enable the DMA RX Stream */
DMA_Cmd(DMA2_Stream2, ENABLE);
DMA_ITConfig(DMA2_Stream2,DMA_IT_TC,ENABLE);
DMA_ClearFlag(DMA2_Stream2, DMA_IT_TC);
/* Enable the USART Rx DMA request */
USART_DMACmd(USART1, USART_DMAReq_Rx, ENABLE);
USART_Cmd(USART1, ENABLE);
}[/mw_shl_code]
[mw_shl_code=c,true] NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);[/mw_shl_code]
[mw_shl_code=c,true]void DMA2_Stream2_IRQHandler(void)
{
unsigned char data;
if(DMA_GetITStatus(DMA2_Stream2,DMA_IT_TCIF0) != RESET)
{
DMA_ClearITPendingBit(DMA2_Stream2,DMA_IT_TCIF0);
data = USART1_DR_Value[0];
}
}[/mw_shl_code]
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( 粤ICP备12000418号-1 )
发表于 2014-9-20 10:32:10
发表于 2014-9-20 23:13:16
