初始化串口1
//初始化串口1
void USART1_Init(uint32_t baudrate)
{
USART_InitTypeDef USART_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
//使能外设时钟
USART_RCC_Config();
//配置串口GPIO
USART_GPIO_Config();
//DMA映射串口的发送与接收
DMA_RemapConfig(DMA1,DMA1_CH2_USART1_TX);
DMA_RemapConfig(DMA1,DMA1_CH3_USART1_RX);
USART_OverSampling8cmd(USART1, ENABLE); //高波特率开启8bit过采样
USART_InitStructure.USART_BaudRate = baudrate;
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_Tx | USART_Mode_Rx;
USART_Init(USART1, &USART_InitStructure);
//DMA配置
DMA_InitStructure.DMA_BufferSize = MAX_LEN;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoreDataSize_Byte;
DMA_InitStructure.DMA_PeripheralInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
//DMA1 channel2配置
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)test_buffer;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;
DMA_InitStructure.DMA_PeripheralBaseAddr = USART1_TDR_Address;
DMA_Init(DMA1_Channel2, &DMA_InitStructure);
//DMA1 channel3配置
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)test_buffer;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_Priority = DMA_Priority_Low;
DMA_InitStructure.DMA_PeripheralBaseAddr = USART1_RDR_Address;
DMA_Init(DMA1_Channel3, &DMA_InitStructure);
//clear DMA1 TC flag
DMA_ClearFlag(DMA1_FLAG_TC2);
DMA_ClearFlag(DMA1_FLAG_TC3);
//使能串口发送接收请求
USART_DMACmd(USART1, USART_DMAReq_Rx, ENABLE);
//使能DMA通道
DMA_Cmd(DMA1_Channel2, ENABLE);
DMA_Cmd(DMA1_Channel3, ENABLE);
//使能串口
USART_Cmd(USART1, ENABLE);
}
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