大神们，我想用板子的串口2接收外部一个模块发送来的数据，用DMA方式，可是怎么接收不到数据呢，串口2能发送数据，也能用DMA方式从内存到外设发送数据，可是收不到外部模块发送的数据，我都要急死了。。。有哪位大神有类似的程序吗，能不能参考一下，是不是我的配置问题，跪求。下面是我的程序：还有就是接收数据和设置是软件流控制还是硬件流控制有关系吗？我是新手，求大神指教
void USART2_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
/* config USART2 clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);
/* USART2 GPIO config */
/* Configure USART2 Tx (PA.02) as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Configure USART2 Rx (PA.03) as input floating */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* USART2 mode config */
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(USART2, &USART_InitStructure);
USART_Cmd(USART2, ENABLE);
}
/**
* @brief USART2 TX DMA 配置
* @param 无
* @retval 无
*/
void USART2_DMA_Config(void)
{
DMA_InitTypeDef DMA_InitStructure;
/*开启DMA时钟*/
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
NVIC_Config(); //配置DMA中断
/*设置DMA源：串口数据寄存器地址*/
DMA_InitStructure.DMA_PeripheralBaseAddr = USART2_DR_Base;
/*内存地址(要传输的变量的指针)*/
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)SendBuff;
/*方向：从外设到内存*/
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
/*传输大小DMA_BufferSize=SENDBUFF_SIZE*/
DMA_InitStructure.DMA_BufferSize = SENDBUFF_SIZE;
/*外设地址不增*/
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
/*内存地址自增*/
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
/*外设数据单位*/
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
/*内存数据单位 8bit*/
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
/*DMA模式：不断循环*/
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal ;
//DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
/*优先级：中*/
DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;
/*禁止内存到内存的传输 */
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
/*配置DMA1的6通道*/
DMA_Init(DMA1_Channel6, &DMA_InitStructure);
/*使能DMA*/
DMA_Cmd (DMA1_Channel6,ENABLE);
DMA_ITConfig(DMA1_Channel6,DMA_IT_TC,ENABLE); //配置DMA发送完成后产生中断
}
static void NVIC_Config(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
/* Configure one bit for preemption priority */
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
/* 配置P[A|B|C|D|E]0为中断源 */
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel6_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
} |
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