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- /**
- ************************************************************************************************
- * @文件 : uart3.c
- * @作者 : 樊春春
- * @版本 : V1.0
- * @时间 : 2022/05/31 20:15:29
- * @邮箱 : [email protected]
- * @说明 : 485底层驱动
- ************************************************************************************************
- **/
- #include "uart6.h"
- static uint8_t uart6_tx_buf[UART6_TX_LEN] = {0};
- static uint8_t uart6_rx_buf[UART6_REC_LEN] = {0};
- UartFrame_TypeDef Uart6FrameStruct[UART6_MAX_MSG_NUM];
- extern OS_EVENT *uart6_mbox;
- void uart6_nvic_config(void)
- {
- NVIC_InitTypeDef NVIC_InitStructure;
- // Usart3 NVIC 配置
- NVIC_InitStructure.NVIC_IRQChannel = USART6_IRQn; //串口3中断通道
- NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; //抢占优先级
- NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //子优先级
- NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; // IRQ通道使能
- NVIC_Init(&NVIC_InitStructure);
- }
- void uart6_dma_init(void)
- {
- DMA_InitTypeDef DMA_InitStructure;
- if ((uint32_t)UART6_DMA_TXCH > (uint32_t)DMA2)
- {
- RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE); // DMA2时钟使能
- }
- else
- {
- RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE); // DMA1时钟使能
- }
- DMA_DeInit(UART6_DMA_TXCH);
- while (DMA_GetCmdStatus(UART6_DMA_TXCH) != DISABLE)
- {
- } //等待DMA可配置
- /* 配置 DMA Stream */
- DMA_InitStructure.DMA_Channel = UART6_DMA; //通道选择
- DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&USART6->DR; // DMA外设地址
- DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)uart6_tx_buf; // DMA 存储器0地址
- DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral; //存储器到外设模式
- DMA_InitStructure.DMA_BufferSize = UART6_TX_LEN; //数据传输量
- 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6
- 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(UART6_DMA_TXCH, &DMA_InitStructure); //初始化DMA Stream
- if ((uint32_t)UART6_DMA_RXCH > (uint32_t)DMA2) //得到当前stream是属于DMA2还是DMA1
- {
- RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE); // DMA2时钟使能
- }
- else
- {
- RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE); // DMA1时钟使能
- }
- DMA_DeInit(UART6_DMA_RXCH);
- while (DMA_GetCmdStatus(UART6_DMA_RXCH) != DISABLE)
- {
- } //等待DMA可配置
- /* 配置 DMA Stream */
- DMA_InitStructure.DMA_Channel = UART6_DMA; //通道选择
- DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&USART6->DR; // DMA外设地址
- DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)uart6_rx_buf; // DMA 存储器0地址
- DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory; //外设到存储器模式
- DMA_InitStructure.DMA_BufferSize = UART6_REC_LEN; //数据传输量
- 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_Circular; // 使用循环模式
- DMA_InitStructure.DMA_Priority = DMA_Priority_Medium; //中等优先级
- 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(UART6_DMA_RXCH, &DMA_InitStructure);
- }
- void uart6_config(void)
- {
- USART_InitTypeDef USART_InitStructure;
- USART_InitStructure.USART_BaudRate = 115200; //波特率设置
- USART_InitStructure.USART_WordLength = USART_WordLength_8b; //字长为8位数据格式
- USART_InitStructure.USART_StopBits = USART_StopBits_1; //一个停止位
- USART_InitStructure.USART_Parity = USART_Parity_No; //无奇偶校验位
- USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; //无硬件数据流控制
- USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收发模式
- USART_Init(USART6, &USART_InitStructure); //初始化串口1
- USART_Cmd(USART6, ENABLE); //使能串口3
- }
- void Uart6DMA_Enable(DMA_Stream_TypeDef *DMA_Streamx, u16 count)
- {
- DMA_Cmd(DMA_Streamx, DISABLE); //关闭DMA传输
- while (DMA_GetCmdStatus(DMA_Streamx) != DISABLE)
- {
- } //确保DMA可以被设置
- DMA_SetCurrDataCounter(DMA_Streamx, count); //数据传输量
- DMA_Cmd(DMA_Streamx, ENABLE); //开启DMA传输
- }
- void uart6_init(void)
- {
- uart6_config();
- uart6_dma_init();
- uart6_nvic_config();
- /* USART DMA enable*/
- USART_DMACmd(USART6, USART_DMAReq_Rx, ENABLE); // 使能串口DMA接收数据
- Uart6DMA_Enable(UART6_DMA_RXCH, UART6_REC_LEN);
- /*configure DMA interrupt*/
- USART_ITConfig(USART6, USART_IT_IDLE, ENABLE); //开启空闲中断
- USART_ITConfig(USART6, USART_IT_TC, ENABLE);
- // UART6_RX_ENABLE;
- }
- /****************************************************
- * 函 数 名:Uart6_Send_Data
- * 函数功能:串口3发送数据
- * 入口参数:buf 待发送数据 len 数据长度
- * 说 明:
- *****************************************************/
- void Uart6_Send_Data(const uint8_t *buf, uint16_t len)
- {
- uint8_t i;
- // UART6_TX_ENABLE; // 485 发送使能
- for (i = 0; i < len; i++) //循环发送数据
- {
- while (USART_GetFlagStatus(USART6, USART_FLAG_TC) == RESET)
- ;
- USART_SendData(USART6, buf[i]);
- }
- while (USART_GetFlagStatus(USART6, USART_FLAG_TC) == RESET)
- ;
- // UART6_RX_ENABLE; // 接收使能
- }
- void uart6_dma_send(const uint8_t *buf, uint16_t len)
- {
- if (DMA_GetFlagStatus(UART6_DMA_TXCH, DMA_FLAG_TCIF6) != RESET)
- {
- DMA_ClearFlag(UART6_DMA_TXCH, DMA_FLAG_TCIF6);
- }
- // UART6_TX_ENABLE; // 485 发送使能
- if (len > UART6_TX_LEN)
- {
- len = UART6_TX_LEN;
- }
- memcpy(uart6_tx_buf, buf, len);
- USART_DMACmd(USART6, USART_DMAReq_Tx, ENABLE);
- Uart6DMA_Enable(UART6_DMA_TXCH, len);
- }
- void USART6_IRQHandler(void)
- {
- static uint8_t u3_index = 0;
- volatile uint8_t clear = 0;
- uint8_t rec_cnt = 0;
- if (RESET != USART_GetITStatus(USART6, USART_IT_IDLE))
- {
- clear = USART6->SR;
- clear = USART6->DR; // 先读SR, 再读DR, 就是为了消除IDLE中断
- DMA_Cmd(UART6_DMA_RXCH, DISABLE);
- DMA_ClearFlag(UART6_DMA_RXCH, DMA_FLAG_TCIF2);
- rec_cnt = UART6_REC_LEN - DMA_GetCurrDataCounter(UART6_DMA_RXCH);
- memcpy(Uart6FrameStruct[u3_index].buf, uart6_rx_buf, rec_cnt);
- Uart6FrameStruct[u3_index].len = rec_cnt;
- OSMboxPost(uart6_mbox, &Uart6FrameStruct[u3_index]);
- if (u3_index < UART6_MAX_MSG_NUM - 1)
- {
- u3_index++;
- }
- else
- {
- u3_index = 0;
- }
- DMA_SetCurrDataCounter(UART6_DMA_RXCH, UART6_REC_LEN);
- DMA_Cmd(UART6_DMA_RXCH, ENABLE);
- }
- else if (RESET != USART_GetITStatus(USART6, USART_IT_TC))
- {
- USART_ClearITPendingBit(USART6, USART_IT_TC);
- // UART6_RX_ENABLE;
- Uart6DMA_Enable(UART6_DMA_RXCH, UART6_REC_LEN); // DMA接收使能
- DMA_Cmd(UART6_DMA_TXCH, DISABLE); // 关闭发送DMA
- DMA_SetCurrDataCounter(UART6_DMA_TXCH, 0); // 清除发送数据长度
- }
- }
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