本帖最后由 billy_2005 于 2023-8-29 09:55 编辑
#申请原创# 经过多次尝试，终于调通了，以下附上测试时的代码
void config_dma(void)
{
DMA_InitType DMA_InitStructure;
RCC_AHBPeriphClockCmd(RCC_AHBPERIPH_DMA1, ENABLE);
DMA_Reset(DMA1_Channel5);
DMA_DefaultInitParaConfig(&DMA_InitStructure);
DMA_InitStructure.DMA_PeripheralInc = DMA_PERIPHERALINC_DISABLE;
DMA_InitStructure.DMA_MemoryInc = DMA_MEMORYINC_ENABLE;
DMA_InitStructure.DMA_PeripheralDataWidth = DMA_PERIPHERALDATAWIDTH_BYTE;
DMA_InitStructure.DMA_MemoryDataWidth = DMA_MEMORYDATAWIDTH_BYTE;
DMA_InitStructure.DMA_Mode = DMA_MODE_NORMAL;
DMA_InitStructure.DMA_Priority = DMA_PRIORITY_VERYHIGH;
DMA_InitStructure.DMA_MTOM = DMA_MEMTOMEM_DISABLE;
DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)&USART1->DT;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)uart1_rx_buf;
DMA_InitStructure.DMA_Direction = DMA_DIR_PERIPHERALSRC;
DMA_InitStructure.DMA_BufferSize = MAX_LEN;
DMA_Init(DMA1_Channel5, &DMA_InitStructure);
DMA_ChannelEnable(DMA1_Channel5, ENABLE);//开启DMA通道
}
void uart_config(unsigned int baud)
{
GPIO_InitType GPIO_InitStructure;
USART_InitType USART_InitStructure;
NVIC_InitType NVIC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2PERIPH_USART1|RCC_APB2PERIPH_GPIOB|RCC_APB2PERIPH_AFIO, ENABLE);
GPIO_PinsRemapConfig(GPIO_Remap_USART1,ENABLE);
USART_Cmd(USART1, DISABLE);
//USART_TX
GPIO_StructInit(&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pins = GPIO_Pins_6;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_MaxSpeed = GPIO_MaxSpeed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
//USART_RX
GPIO_StructInit(&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pins = GPIO_Pins_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_PU;
GPIO_InitStructure.GPIO_MaxSpeed = GPIO_MaxSpeed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
//Usart1 NVIC ??
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ????
NVIC_Init(&NVIC_InitStructure);
USART_InitStructure.USART_BaudRate = baud;//?????9600;
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(USART1, &USART_InitStructure);
USART_INTConfig(USART1, USART_INT_IDLEF, ENABLE);
USART_DMACmd(USART1,USART_CTRL3_DMAREN,ENABLE);//开启DMA数据接收
USART_Cmd(USART1, ENABLE); //????
}
void USART1_IRQHandler(void)
{
unsigned int temp32;
if(USART_GetFlagStatus(USART1, USART_FLAG_IDLEF) != RESET)
{
temp32=USART_ReceiveData(USART1);
USART_DMACmd(USART1,USART_CTRL3_DMAREN,DISABLE);//关闭DMA数据接收
DMA_ChannelEnable(DMA1_Channel5, DISABLE);//关闭DMA通道
uart1_rx_index = MAX_LEN - DMA_GetCurrDataCounter(DMA1_Channel5);//获取缓冲区接收数量
uart1_rx_finish=enable;
}
}
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