芯片型号HK32F103C8T6, 串口1初始化了DMA发送和接收， 使能发送完成中断和空闲中断， 最后使能串口调用USART_Cmd(USARTx, ENABLE); 就死机了。 初始化代码如下：
void USARTx_init(u32 baud, u8 parity)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
USART_ClockInitTypeDef USART_ClockInitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
//---------------------串口功能配置---------------------
//打开串口对应的外设时钟
if(USART_RCC_APBxPeriph_USARTx == RCC_APB2Periph_USART1)
{
RCC_APB2PeriphClockCmd(USART_RCC_APBxPeriph_USARTx, ENABLE);
}
else
{
RCC_APB1PeriphClockCmd(USART_RCC_APBxPeriph_USARTx, ENABLE);
}
//启动DMA时钟
RCC_AHBPeriphClockCmd(USART_RCC_AHBPeriph_DMAx, ENABLE);
//DMA发送中断设置
NVIC_InitStructure.NVIC_IRQChannel = USART_DMAx_CHx_TX_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
//DMA1通道4配置
DMA_DeInit(USART_DMAx_CHx_TX);
//外设地址
DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)(&USARTx->DR);
//内存地址
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)UsartTxBuf;
//dma传输方向单向
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
//设置DMA在传输时缓冲区的长度
DMA_InitStructure.DMA_BufferSize = USART_TX_LEN;
//设置DMA的外设递增模式，一个外设
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
//设置DMA的内存递增模式
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
//外设数据字长
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
//内存数据字长
DMA_InitStructure.DMA_MemoryDataSize = DMA_PeripheralDataSize_Byte;
//设置DMA的传输模式
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
//设置DMA的优先级别
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
//设置DMA的2个memory中的变量互相访问
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(USART_DMAx_CHx_TX, &DMA_InitStructure);
//使能DMA发送完成中断
// DMA_ITConfig(USART_DMAx_CHx_TX, DMA_IT_TC,ENABLE);
//串口发送完成中断
USART_ITConfig(USARTx, USART_IT_TC, ENABLE);
//串口收DMA配置 //////////////////////////////////////////////////////////
//启动DMA时钟
RCC_AHBPeriphClockCmd(USART_RCC_AHBPeriph_DMAx, ENABLE);
//DMA1通道5配置
DMA_DeInit(USART_DMAx_CHx_RX);
//外设地址
DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)(&USARTx->DR);
//内存地址
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)UsartRxBuf;
//dma传输方向单向
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
//设置DMA在传输时缓冲区的长度
DMA_InitStructure.DMA_BufferSize = USART_RX_LEN;
//设置DMA的外设递增模式，一个外设
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
//设置DMA的内存递增模式
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
//外设数据字长
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
//内存数据字长
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
//设置DMA的传输模式
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
//设置DMA的优先级别
DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
//设置DMA的2个memory中的变量互相访问
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(USART_DMAx_CHx_RX,&DMA_InitStructure);
//使能通道5
DMA_Cmd(USART_DMAx_CHx_RX,ENABLE);
//初始化参数
USART_ClockInitStructure.USART_Clock = USART_Clock_Disable;
USART_ClockInitStructure.USART_CPOL = USART_CPOL_Low;
USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge;
USART_ClockInitStructure.USART_LastBit = USART_LastBit_Disable;
/* Configure the USART3 synchronous paramters */
USART_ClockInit(USARTx, &USART_ClockInitStructure);
USART_InitStructure.USART_BaudRate = baud;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
switch(parity)
{
case PAR_ODD:
USART_InitStructure.USART_Parity = USART_Parity_Odd;
USART_InitStructure.USART_WordLength = USART_WordLength_9b; //开启校验时，数据位必须设置为9位，否则校验位会覆盖数据最高位
break;
case PAR_EVEN:
USART_InitStructure.USART_Parity = USART_Parity_Even;
USART_InitStructure.USART_WordLength = USART_WordLength_9b; //开启校验时，数据位必须设置为9位，否则校验位会覆盖数据最高位
break;
case PAR_NONE:
default:
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
break;
}
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
//初始化串口
USART_Init(USARTx,&USART_InitStructure);
//串口空闲中断
USART_ITConfig(USARTx, USART_IT_IDLE, ENABLE);
//配置UART1中断
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_3);
NVIC_InitStructure.NVIC_IRQChannel = USARTx_IRQn; //通道设置为串口1中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; //中断占先等级0
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; //中断响应优先级0
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //打开中断
NVIC_Init(&NVIC_InitStructure); //初始化
//采用DMA方式发送
USART_DMACmd(USARTx,USART_DMAReq_Tx,ENABLE);
//采用DMA方式接收
USART_DMACmd(USARTx,USART_DMAReq_Rx,ENABLE);
//启动串口
//LedSwitch(0, LED_ON); //在USART_Cmd(USARTx, ENABLE)前调用，可以正常点亮LED,
USART_Cmd(USARTx, ENABLE);
LedSwitch(0, LED_ON); //此处死机， 点不亮LED!!!!!!! 貌似LED快闪了一下就灭了
//设置IO口时钟
RCC_APB2PeriphClockCmd(USART_RCC_APB2Periph_GPIOx | RCC_APB2Periph_AFIO, ENABLE);
//串口1的管脚初始化
GPIO_InitStructure.GPIO_Pin = USART_GPIO_Pin_TX; //管脚9
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //选择GPIO响应速度
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
GPIO_Init(USART_GPIOx, &GPIO_InitStructure); //TX初始化
GPIO_InitStructure.GPIO_Pin = USART_GPIO_Pin_RX; //管脚10
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空输入
GPIO_Init(USART_GPIOx, &GPIO_InitStructure); //RX初始化
//设置485控制线时钟
RCC_APB2PeriphClockCmd(RS485_RCC_APB2Periph_GPIOx, ENABLE);
//串口1的管脚初始化
GPIO_InitStructure.GPIO_Pin = RS485_GPIO_Pin;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //选择GPIO响应速度
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; //推挽输出
GPIO_Init(RS485_GPIOx, &GPIO_InitStructure); //TX初始化
GPIO_ResetBits(RS485_GPIOx, RS485_GPIO_Pin); //默认RS485为接收状态
}
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