gd407替换st207采用st库-串口空闲中断+dma收发
st采用串口3-dma收发，串口空闲中断，用来读写计量芯片RN8209D
GPIO配置：
void GPIO_CFG(COM_TypeDef Com)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_AHB1PeriphClockCmd( COM_TX_PORT_CLK[Com] | COM_RX_PORT_CLK[Com], ENABLE);
GPIO_InitStructure.GPIO_Pin = COM_TX_PIN[Com];
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(COM_TX_PORT[Com], &GPIO_InitStructure);
GPIO_PinAFConfig(COM_TX_PORT[Com],COM_TX_AF_PIN[Com],COM_AF_NAME[Com]);
GPIO_InitStructure.GPIO_Pin = COM_RX_PIN[Com];
GPIO_InitStructure.GPIO_Mode =GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(COM_RX_PORT[Com], &GPIO_InitStructure);
GPIO_PinAFConfig(COM_RX_PORT[Com],COM_RX_AF_PIN[Com],COM_AF_NAME[Com]);
}
串口3配置
USART_DeInit(COM_USART[Com]);
//使能8倍过采样:配置8倍过采样后，对于波特率偏低的要求会低一些
USART3->CR1 |= 0x8000;
//USART_StructInit(&USART_InitStructure);
USART_InitStructure.USART_BaudRate = 4800;
USART_InitStructure.USART_WordLength = USART_WordLength_9b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_Even;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(COM_USART[Com],&USART_InitStructure);
USART_ITConfig(COM_USART[Com],USART_IT_IDLE,ENABLE);
USART_ITConfig(COM_USART[Com],USART_IT_TC,ENABLE);
USART_DMACmd(COM_USART[Com],USART_DMAReq_Tx, ENABLE);
USART_DMACmd(COM_USART[Com],USART_DMAReq_Rx, ENABLE);
USART_Cmd(COM_USART[Com],ENABLE);
dma配置
#define COM3_FRAM_MAN_SIZE (50)
u8 Com3DmaSendBuf[COM3_FRAM_MAN_SIZE];
u8 Com3DmaRecBuf[COM3_FRAM_MAN_SIZE];
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1,ENABLE);
DMA_DeInit(DMA1_Stream3);
DMA_InitStructure.DMA_Channel = DMA_Channel_4; //通道4
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&USART3->DR; //数据寄存器
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)Com3DmaSendBuf; //内存地址
DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral; //外设地址
DMA_InitStructure.DMA_BufferSize = COM3_FRAM_MAN_SIZE; //传输数据个数
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //传输过程中外设地址增加失能
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //传输过程中内存地址增加失能
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; //数据位宽
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; //数据位宽
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; //单次传输模式
DMA_InitStructure.DMA_Priority = DMA_Priority_High; //DMA等级高度
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable; //不使用FIFO
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull; //FIFO溢出个数
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single; //单次突发模式
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; //单次突发模式
DMA_Init(DMA1_Stream3,&DMA_InitStructure); // dma发送
DMA_DeInit(DMA1_Stream1);
DMA_InitStructure.DMA_Channel = DMA_Channel_4; //通道4
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&USART3->DR; //数据寄存器
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)Com3DmaRecBuf; //内存地址
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory; //外设地址
DMA_InitStructure.DMA_BufferSize = COM3_FRAM_MAN_SIZE; //传输数据个数
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //传输过程中外设地址增加失能
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //传输过程中内存地址增加失能
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; //数据位宽
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; //数据位宽
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; //单次传输模式
DMA_InitStructure.DMA_Priority = DMA_Priority_High; //DMA等级高度
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable; //不使用FIFO
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull; //FIFO溢出个数
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single; //单次突发模式
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; //单次突发模式
DMA_Init(DMA1_Stream1,&DMA_InitStructure); // dma接收
DMA_Cmd(DMA1_Stream3,DISABLE);
DMA_Cmd(DMA1_Stream1,ENABLE);
串口发送
void BSP_Com3_OpenTxInt(uint16_t DateLen)
{
DMA_SetCurrDataCounter(DMA1_Stream3,DateLen);
DMA_Cmd(DMA1_Stream3 , ENABLE);
}
串口中断接口
void USART3_IRQHandler(void)
{
if(USART_GetITStatus(USART3, USART_IT_IDLE) != RESET)
{
USART_ClearITPendingBit(USART3, USART_IT_IDLE); /* 清除空闲中断标志位 */
USART_ReceiveData(USART3);/* 清除接收完成标志位 */
//u16_DmaClearTemp = USART3->SR;
//u16_DmaClearTemp = USART3->DR;
BSP_Com3RecvFcb();
}
if(USART_GetITStatus(USART3, USART_IT_TC) != RESET)
{
USART_ClearITPendingBit(USART3, USART_IT_TC);
ComDmaSendBusyflag[COM3] = 0;
iRqSend++;
}
}
void BSP_Com3RecvFcb(void)
{
uint16_t Len;
DMA_Cmd(DMA1_Stream1, DISABLE);
DMA_ClearITPendingBit(DMA1_Stream1,DMA_IT_TCIF1);
DMA_ClearITPendingBit(DMA1_Stream1,DMA_IT_HTIF1);
Len=COM3_FRAM_MAN_SIZE-DMA_GetCurrDataCounter(DMA1_Stream1);
if((0 < Len) && (Len<=COM3_FRAM_MAN_SIZE))
{
Dat_enUnFixQueueNode(qHandleCom3Rx,Com3DmaRecBuf,Len);
}
memset(Com3DmaRecBuf, 0, COM3_FRAM_MAN_SIZE);
DMA_SetCurrDataCounter(DMA1_Stream1,COM3_FRAM_MAN_SIZE);
DMA_Cmd(DMA1_Stream1, ENABLE);
}
目前存在问题：dma接收数据-长度跟内容都不对。
解决：调试跟踪后，使能8倍过采样，配置8倍过采样后，对于波特率偏低的要求会低一些。之后收发正常。