|
楼主 |
发表于 2018-9-21 13:55:04
|
显示全部楼层
以下是程序代码:
void USART1_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
USART_DeInit(USART1);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE); //for USART1 and USART6
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_USART1);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_USART1);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_Init(GPIOA, &GPIO_InitStructure);
USART_InitStructure.USART_BaudRate = 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_Cmd(USART1, ENABLE);
USART_ClearFlag(USART1, USART_FLAG_TC); //清除发送完成标志
while (USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);
USART_ClearFlag(USART1, USART_FLAG_TC); //清除发送完成标志
USART_ITConfig(USART1, USART_IT_RXNE, DISABLE);
USART_ITConfig(USART1, USART_IT_TXE, DISABLE);
USART_ITConfig(USART1, USART_IT_IDLE, ENABLE);
USART_ITConfig(USART1, USART_IT_TC, ENABLE);
USART_DMACmd(USART1 , USART_DMAReq_Tx,ENABLE);
USART_DMACmd(USART1 , USART_DMAReq_Rx,ENABLE);
}
void USART1_IRQHandler(void)
{
uint16_t ch;
if (USART_GetITStatus(USART1,USART_IT_IDLE) != RESET)
{
USART_ClearITPendingBit(USART1 , USART_IT_IDLE);
ch = USART_ReceiveData(USART1);
__DEBUG_USART1_IT_IDLE++;
DMA_Cmd(DMA2_Stream5, DISABLE);
DMA_ClearFlag(DMA2_Stream5, DMA_FLAG_TCIF5);
ch = USART1_DMA_RX_BUFFER_MAX_LENGTH - DMA_GetCurrDataCounter(DMA2_Stream5);
if (ch > 0)
{
MB_USART1.Outtime_mark = TRUE;
MB_USART1.receCount = ch;
memcpy(MB_USART1.mscomm_buffer , USART1_DMA_RX_Buffer , MB_USART1.receCount);
}
DMA_SetCurrDataCounter(DMA2_Stream5 , USART1_DMA_RX_BUFFER_MAX_LENGTH);
DMA_Cmd(DMA2_Stream5, ENABLE);
}
if (USART_GetITStatus(USART1,USART_IT_TC)!= RESET)
{
USART_ClearITPendingBit(USART1, USART_IT_TC);
__DEBUG_USART1_IT_TC++;
DMA_Cmd(DMA2_Stream7 , DISABLE);
DMA_ClearFlag(DMA2_Stream7, DMA_FLAG_TCIF7);
DMA_SetCurrDataCounter(DMA2_Stream7 , 0);
GPIO_USART1_RS485_RECIVE_enable();
}
}
void USART1_DMA_Tx_Config(void)
{
DMA_InitTypeDef DMA_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2 , ENABLE); //DMA2时钟使能
DMA_DeInit(DMA2_Stream7);
while (DMA_GetCmdStatus(DMA2_Stream7) != DISABLE); //等待DMA可配置
DMA_InitStructure.DMA_Channel = DMA_Channel_4; //DMA通道配置
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&USART1->DR; //DMA外设地址
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)USART1_DMA_TX_Buffer; //发送缓存指针
DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral; //DMA传输方向:内存--->外设
DMA_InitStructure.DMA_BufferSize = USART1_DMA_TX_BUFFER_MAX_LENGTH; //数据传输字节数量
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设非增量模式
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //存储器增量模式
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; //外设数据长度:8位
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; //存储器数据长度:8位
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; //使用普通模式
DMA_InitStructure.DMA_Priority = DMA_Priority_Medium; //中等优先级 DMA_Priority_High
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single; //存储器突发单次传输
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; //外设突发单次传输
DMA_Init(DMA2_Stream7, &DMA_InitStructure); //初始化DMA Stream
DMA_Cmd(DMA2_Stream7, DISABLE); //开启DMA传输
DMA_ClearITPendingBit(DMA2_Stream7, DMA_IT_TCIF7); //清标志
}
void USART1_DMA_Rx_Config(void)
{
DMA_InitTypeDef DMA_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2 , ENABLE); //DMA2时钟使能
DMA_DeInit(DMA2_Stream5);
while (DMA_GetCmdStatus(DMA2_Stream5) != DISABLE); //等待DMA可配置
DMA_InitStructure.DMA_Channel = DMA_Channel_4; //通道选择
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&USART1->DR; //DMA外设地址
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)USART1_DMA_RX_Buffer; //接收缓存指针
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory ; //DMA传输方向:外设到存储器模式:外设--->内存
DMA_InitStructure.DMA_BufferSize = USART1_DMA_RX_BUFFER_MAX_LENGTH; //缓冲大小
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设非增量模式
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //存储器增量模式
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; //外设数据长度:8位
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; //存储器数据长度:8位
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; //使用普通模式
DMA_InitStructure.DMA_Priority = DMA_Priority_Medium; //中等优先级 DMA_Priority_VeryHigh
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single; //存储器突发单次传输
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; //外设突发单次传输
DMA_Init(DMA2_Stream5 , &DMA_InitStructure); //初始化DMA_Stream5
DMA_Cmd(DMA2_Stream5, ENABLE); //开启DMA传输
DMA_ClearITPendingBit(DMA2_Stream5, DMA_IT_TCIF5); //清标志
}
void USART1_DMA_Begin_Send(uint8_t *send_buffer , uint16_t nSendCount)
{
USART1_MODBUS_send_count++;
GPIO_USART1_RS485_SEND_enable();
__NOP();
__NOP();
__NOP();
__NOP();
__NOP();
__NOP();
__NOP();
__NOP();
__NOP();
__NOP();
if (nSendCount < USART1_DMA_TX_BUFFER_MAX_LENGTH)
{
memcpy(USART1_DMA_TX_Buffer , send_buffer , nSendCount);
DMA_Cmd(DMA2_Stream7 , DISABLE); //关闭DMA传输
while (DMA_GetCmdStatus(DMA2_Stream7) != DISABLE); //确保DMA可以被设置
DMA_SetCurrDataCounter(DMA2_Stream7 , nSendCount); //数据传输量
DMA_Cmd(DMA2_Stream7 , ENABLE); //开启DMA传输
}
}
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_4);//嵌套优先级分组为 4 , 注:SysTick的优先级默认=15
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
|
|