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发表于 2016-8-14 21:38:32
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本帖最后由 shangdawei 于 2016-8-14 21:39 编辑
很不错，学习了。顺便格式化一下看看：
- //超时时间定义
- #define UART1_TimeoutComp 2 //20ms
- #define UART2_TimeoutComp 10 //100ms
- #define UART3_TimeoutComp 10 //100ms
- #define SRC_USART1_DR (&(USART1->DR)) //串口接收寄存器作为源头
- #define SRC_USART2_DR (&(USART2->DR)) //串口接收寄存器作为源头
- #define SRC_USART3_DR (&(USART3->DR)) //串口接收寄存器作为源头
- extern u16 UART1_Flag, UART2_Flag, UART3_Flag;
- extern u8 uart1_data[ 200 ], uart3_data[ 500 ], uart2_data[ 500 ];
- u8 UART1_Timeout, UART2_Timeout, UART3_Timeout;
- u16 UART1_FlagTemp, UART2_FlagTemp, UART3_FlagTemp;
- u8 uart1_data_temp[ 200 ], uart2_data_temp[ 500 ], uart3_data_temp[ 500 ];
- u16 uart1_Flag_last = 0, uart2_Flag_last = 0, uart3_Flag_last = 0;
- //定时器初始化
- void TimerInit( void )
- {
- //定时器初始化数据结构定义
- TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
- //初始化定时器，用于超时接收，20ms
- //复位计数器
- TIM_DeInit( TIM2 );
- TIM_TimeBaseStructure.TIM_Period = 100; //计数上限，100*100us = 10000us = 10ms
- TIM_TimeBaseStructure.TIM_Prescaler = 4799; //预分频4800,48MHz主频，分频后时钟周期100us
- TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //不分频
- TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数
- TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
- //初始化
- TIM_TimeBaseInit( TIM2, &TIM_TimeBaseStructure );
- //清中断
- TIM_ClearFlag( TIM2, TIM_FLAG_Update );
- //使能定时器中断
- TIM_ITConfig( TIM2, TIM_IT_Update, ENABLE );
- TIM_UpdateDisableConfig( TIM2, DISABLE );
- //定时器清零
- TIM_SetCounter( TIM2, 0 );
- //定时器启动
- TIM_Cmd( TIM2, ENABLE );
- }
- //DMA初始化，只列出一个通道，其他两个通道相同
- void DMA5_Init( void )
- {
- DMA_InitTypeDef DMA_InitStructure;
- DMA_DeInit( DMA1_Channel5 ); //将DMA的通道1寄存器重设为缺省值
- DMA_InitStructure.DMA_PeripheralBaseAddr = ( u32 )SRC_USART1_DR; //源头BUF既是 (&(USART1->DR))
- DMA_InitStructure.DMA_MemoryBaseAddr = ( u32 )uart1_data_temp; //目标BUF 既是要写在哪个个数组之中
- DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; //外设作源头//外设是作为数据传输的目的地还是来源
- DMA_InitStructure.DMA_BufferSize = 200; //DMA缓存的大小 单位在下边设定
- DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设地址寄存器不递增
- DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //内存地址递增
- DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; //外设字节为单位
- DMA_InitStructure.DMA_MemoryDataSize = DMA_PeripheralDataSize_Byte; //内存字节为单位
- DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; //工作在循环缓存模式
- DMA_InitStructure.DMA_Priority = DMA_Priority_High; //4优先级之一的(高优先)VeryHigh/High/Medium/Low
- DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; //非内存到内存
- DMA_Init( DMA1_Channel5, &DMA_InitStructure ); //根据DMA_InitStruct中指定的参数初始化DMA的通道1寄存器
- DMA_ITConfig( DMA1_Channel5, DMA_IT_TC, ENABLE ); //DMA5传输完成中断
- USART_DMACmd( USART1, USART_DMAReq_Rx, ENABLE ); //使能USART1的接收DMA请求
- DMA_Cmd( DMA1_Channel5, ENABLE ); //正式允许DMA
- }
- //串口初始化，只列出一个通道，其他两个通道相同
- void USART1_Configuration( void )
- {
- //串口初始化数据结构定义
- USART_InitTypeDef USART_InitStructure;
- //初始化串口为38400,n,8,1
- USART_InitStructure.USART_BaudRate = 38400;
- 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;
- //初始化
- USART_Init( USART1, &USART_InitStructure );
- //启动串口，不需要接收中断
- USART_Cmd( USART1, ENABLE );
- //默认设置为输入状态
- DMA5_Init();
- }
- //定时器中断服务程序
- void TIM2_IRQHandler( void )
- {
- u16 i;
- //清定时器中断
- TIM_ClearITPendingBit( TIM2, TIM_FLAG_Update );
- UART1_Timeout++;
- UART2_Timeout++;
- UART3_Timeout++;
- //------------------------------------------------------------------
- i = DMA_GetCurrDataCounter( DMA1_Channel5 );
- DMA_ClearITPendingBit( DMA1_IT_GL5 ); //清除全部中断标志
- if ( i != uart1_Flag_last )
- //未完成传输
- {
- UART1_Timeout = 0;
- uart1_Flag_last = i;
- }
- else
- {
- if ( UART1_Timeout > UART1_TimeoutComp )
- //产生超时
- {
- if ( i < 200 )
- //有数据接收到
- {
- UART1_FlagTemp = 200-i; //得到接收到的字节数
- for ( i = 0; i < UART1_FlagTemp; i++ )
- //将数据拷贝到缓冲区
- uart1_data[ i ] = uart1_data_temp[ i ];
- UART1_Flag = UART1_FlagTemp;
- DMA_ClearFlag( DMA1_FLAG_TC5 );
- DMA_Cmd( DMA1_Channel5, DISABLE ); //正式允许DMA
- DMA5_Init();
- }
- UART1_Timeout = 0;
- }
- }
- //------------------------------------------------------------------
- i = DMA_GetCurrDataCounter( DMA1_Channel6 );
- DMA_ClearITPendingBit( DMA1_IT_GL6 ); //清除全部中断标志
- if ( i != uart2_Flag_last )
- //未完成传输
- {
- UART2_Timeout = 0;
- uart2_Flag_last = i;
- }
- else
- {
- if ( UART2_Timeout > UART2_TimeoutComp )
- //产生超时
- {
- if ( i < 500 )
- //有数据接收到
- {
- UART2_FlagTemp = 500-i; //得到接收到的字节数
- for ( i = 0; i < UART2_FlagTemp; i++ )
- //将数据拷贝到缓冲区
- uart2_data[ i ] = uart2_data_temp[ i ];
- UART2_Flag = UART2_FlagTemp;
- DMA_ClearFlag( DMA1_FLAG_TC6 );
- DMA_Cmd( DMA1_Channel6, DISABLE ); //正式允许DMA
- DMA6_Init();
- }
- UART2_Timeout = 0;
- }
- }
- //------------------------------------------------------------------
- i = DMA_GetCurrDataCounter( DMA1_Channel3 );
- DMA_ClearITPendingBit( DMA1_IT_GL3 ); //清除全部中断标志
- if ( i != uart3_Flag_last )
- //未完成传输
- {
- UART3_Timeout = 0;
- uart3_Flag_last = i;
- }
- else
- {
- if ( UART3_Timeout > UART3_TimeoutComp )
- //产生超时
- {
- if ( i < 500 )
- //有数据接收到
- {
- UART3_FlagTemp = 500-i; //得到接收到的字节数
- for ( i = 0; i < UART3_FlagTemp; i++ )
- //将数据拷贝到缓冲区
- uart3_data[ i ] = uart3_data_temp[ i ];
- UART3_Flag = UART3_FlagTemp;
- DMA_ClearFlag( DMA1_FLAG_TC3 );
- DMA_Cmd( DMA1_Channel3, DISABLE ); //正式允许DMA
- DMA3_Init();
- }
- UART3_Timeout = 0;
- }
- }
- }
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