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优化的UART驱动，可以适应多种RTOS，也能裸奔。

2013-6-30 12:08:55 4796

0 该驱动采用中断方式，未来会加入DMA方式。中断方式采用FIFO的方式。用户程序直接用UartRead和UartWrite操作读写。无论采用中断还是DMA，都会支持一个中断回调函数。该中断回调函数处理由用户自己定义，触发条件为——接收缓冲超时（1Byte的时间），接收缓冲过半，接收缓冲满，发送缓冲空，以应对UART在某些场合对实时性的需求。同时为了支持多种OS环境（本人移植过UCOS和RTX两种OS），也可以裸奔，UART驱动中不会有任何和特定OS相关的操作，所以中断回调函数中可以向任务中发送信号量，消息邮箱等。同时任务在初始化UART时，可以分配一个缓冲供中断回调函数操作。比如中断回调函数向任务中发送一个消息邮箱，消息邮箱的缓冲可以建立在任务中，初始化串口的时候分配给串口驱动，当串口中断发生时直接把该缓冲区的指针发给任务，如果中断发送给任务的消息邮箱，指针位于中断函数的局部变量，当中断函数结束时，任务还没有收到消息邮箱，邮箱里面的“邮件”就变成了“空白”。 UART.h /****************** (C) COPYRIGHT 2008 boost ****************** * File Name : usart.h * Author : Luo Yiming * Version : V1.1.0 * Date : 2013年3月19日 * Description : Header for usart.c module *******************************************************************************/ / Includes ------------------------------------------------------------------/ #include "STM32f10x.h" / Define to prevent recursive inclusion ------------------------------------ / #ifndef __USART_H #define __USART_H #define UART_RX_IDLE 0x01 // Uart Rx Buffer is less than half when idle #define UART_RX_OVF 0x02 // Uart Rx Buffer is more than half #define UART_RX_FULL 0x04 // Uart Rx Buffer is full #define UART_TX_DONE 0x08 // Uart Tx Buffer is empty #define UART_PORT_MAX 5 #define UART_PORT_1 0 #define UART_PORT_2 1 #define UART_PORT_3 2 #define UART_PORT_4 3 #define UART_PORT_5 4 #define UART_FLOW_EN 0x0080 #define UART_2STOP_EN 0x0040 #define UART_EVEN_EN 0x0020 #define UART_ODD_EN 0x0010 typedef struct{ u16 event; u8 rxCh; u8 txCh; }uart_status_t; typedef struct{ u16 rxSize; u16 txSize; u8 rxBuf; u8* txBuf; void (isr)(uint8_t port,uart_status_t status,void msg); void msg; USART_InitTypeDef init; u8 rxdma; u8 txdma; }uart_seting_t; / Exported functions ------------------------------------------------------- / extern void UartNvicSet(uint8_t port,uint8_t preprio,uint8_t subprio); extern void USART_ISR(uint8_t port); extern void UartSeting(uint8_t port,uart_seting_t seting); extern uint16_t UartRead(uint8_t port,uint8_t data,uint16_t len); extern uint16_t UartWrite(uint8_t port,uint8_t data,uint16_t len); extern uint16_t UartRxCnt(uint8_t port); extern uint16_t UartTxCnt(uint8_t port); extern void UartSetIsrMsg(uint8_t port,void msg); #endif /* __USART_H / /**************** (C) COPYRIGHT 2008 boost *END OF FILE*/ 复制代码* UART .C /****************** (C) COPYRIGHT 2008 litt ****************** * File Name : usart.c * Author : luo yi ming * Version : V1.1.0 * Date : 2013年3月19日 * Description : This file provides a set of functions needed to manage the * communication between usart peripheral and RS485/HW/PLC. *******************************************************************************/ / Includes ------------------------------------------------------------------/ #include "usart.h" / Private typedef -----------------------------------------------------------/ struct _uart_fifo_t{ //rx 12byte u8 rxBuf; //4 u16 rxSize; //2 vu16 rxPush; //2 vu16 rxPop; //2 vu16 rxCnt; //2 //tx 12byte u8* txBuf; //4 u16 txSize; //2 vu16 txPush; //2 vu16 txPop; //2 vu16 txCnt; //2 //Isr 4byte void (isr)(uint8_t port,uart_status_t status,void msg); //task msg to isr void* msg; };//28 struct _uart_device_t{ struct _uart_fifo_t fifo; USART_TypeDef* uart; DMA_Channel_TypeDef* rxdma; DMA_Channel_TypeDef* txdma; }; typedef USART_TypeDef* pUSART_TypeDef; typedef DMA_Channel_TypeDef* pDMA_Channel_TypeDef; /* Private define ------------------------------------------------------------/ //#define UART_OVF_LINE 16 //#define UART_MIN_FIFO 16 //#define UART_MAX_FIFO 2048 #define UART1_DMA_RX DMA1_Channel5 #define UART1_DMA_TX DMA1_Channel4 #define UART2_DMA_RX DMA1_Channel6 #define UART2_DMA_TX DMA1_Channel7 #define UART3_DMA_RX DMA1_Channel3 #define UART3_DMA_TX DMA1_Channel2 #define UART_REG_1 {USART1,UART1_DMA_RX,UART1_DMA_TX} #define UART_REG_2 {USART2,UART2_DMA_RX,UART2_DMA_TX} #define UART_REG_3 {USART3,UART3_DMA_RX,UART3_DMA_TX} #define UART_REG_4 {UART4,NULL,NULL} #define UART_REG_5 {UART5,NULL,NULL} / Private macro -------------------------------------------------------------/ / Private variables ---------------------------------------------------------/ const pUSART_TypeDef USART_TABLE[UART_PORT_MAX] = {USART1,USART2,USART3,UART4,UART5}; const pDMA_Channel_TypeDef UART_DMA_RX_TABLE[UART_PORT_MAX] = {UART1_DMA_RX,UART2_DMA_RX,UART3_DMA_RX,NULL,NULL}; const pDMA_Channel_TypeDef UART_DMA_TX_TABLE[UART_PORT_MAX] = {UART1_DMA_TX,UART2_DMA_TX,UART3_DMA_TX,NULL,NULL}; static struct _uart_device_t UartDevice[UART_PORT_MAX]; / Function -------------------------------------------------------------------/ /************************************************************************************************ * Name : _uart_isr * Describe : 串口中断服务程序 * param : pfifo,uart * Return : 无 * Create by : 罗一鸣 2012-12-03 * Moid by : ************************************************************************************************/ static __inline void _uart_isr(uint8_t port,struct _uart_fifo_t pfifo,USART_TypeDef uart) { //uint32_t ie; uint32_t iflag; uart_status_t status = {0,0,0}; //ie = __get_PRIMASK(); //__set_PRIMASK(1); iflag = (uart->CR1 & uart->SR);//(USART_FLAG_TXE\|USART_FLAG_TC\|USART_FLAG_RXNE\|USART_FLAG_IDLE) //__set_PRIMASK(ie); //IDLE IRQ if(iflag & USART_FLAG_IDLE) { status.rxCh = uart->DR; if(pfifo->rxCnt <= (pfifo->rxSize>>1)) //rx buffer is not full when rx idle happen { status.event \|= UART_RX_IDLE; } } //RX IRQ if(iflag & USART_FLAG_RXNE) { status.rxCh = uart->DR; if(pfifo->rxCnt < pfifo->rxSize) { pfifo->rxBuf[pfifo->rxPush] = status.rxCh; pfifo->rxPush += 1; if(pfifo->rxPush >= pfifo->rxSize) { pfifo->rxPush = 0; } pfifo->rxCnt += 1; if(pfifo->rxCnt == pfifo->rxSize) //rx buffer is full { status.event \|= UART_RX_FULL; } else if(pfifo->rxCnt > (pfifo->rxSize>>1))//rx byte is more than half of rx buffer { status.event \|= UART_RX_OVF; } } } //TXE IRQ if(iflag & USART_FLAG_TXE) { uart->CR1 &= (uint16_t)~0x0080; //off TX if(pfifo->txCnt) { status.txCh = pfifo->txBuf[pfifo->txPop]; uart->DR = status.txCh; uart->CR1 \|= (uint16_t)0x0080; pfifo->txPop += 1; if(pfifo->txPop >= pfifo->txSize) { pfifo->txPop = 0; } pfifo->txCnt -= 1; if(pfifo->txCnt == 0) { status.event \|= UART_TX_DONE; } } } //run isr function if((NULL != pfifo->isr) && (0 != status.event)) { pfifo->isr(port,status,pfifo->msg); } } /************************************************************************************************ * Name : _uart_read_isr * Describe : 串口读取函数中断模式 * param : * Return : * Create by : * Moid by : ************************************************************************************************/ static uint16_t _uart_read_isr(struct _uart_fifo_t pfifo,USART_TypeDef uart,uint8_t data,uint16_t len) { uint32_t ie; uint16_t n; if(len == 0) { return 0; } for(n=0;n { if(n < pfifo->rxCnt) { data++ = pfifo->rxBuf[pfifo->rxPop]; pfifo->rxPop += 1; if(pfifo->rxPop>=pfifo->rxSize) { pfifo->rxPop = 0; } } else { break; } } ie = __get_PRIMASK(); __set_PRIMASK(1); pfifo->rxCnt -= n; __set_PRIMASK(ie); return n; } /************************************************************************************************ * Name : _uart_write_isr * Describe : 串口写入函数中断模式 * param : * Return : * Create by : * Moid by : ************************************************************************************************/ static uint16_t _uart_write_isr(struct _uart_fifo_t pfifo,USART_TypeDef uart,uint8_t data,uint16_t len) { uint32_t ie; uint16_t n; if(len == 0) { return 0; } for(n=0;n { if((pfifo->txSize-n) > pfifo->txCnt) { pfifo->txBuf[pfifo->txPush] = data++; pfifo->txPush += 1; if(pfifo->txPush >= pfifo->txSize) { pfifo->txPush = 0; } } else { break; } } ie = __get_PRIMASK(); __set_PRIMASK(1); pfifo->txCnt += n; __set_PRIMASK(ie); return n; } /************************************************************************************************ * Name : UART_ISR * Describe : 串口中断服务 * param : * Return : * Create by : * Moid by : ***********************************************************************************************/ void USART_ISR(uint8_t port) { _uart_isr(port,&UartDevice[port].fifo,UartDevice[port].uart); } /*********************************************************************************************** * Name : UART_DMA_ISR * Describe : 串口中断服务 * param : * Return : * Create by : * Moid by : ************************************************************************************************/ void UART_DMA_ISR(uint8_t port) { } / __inline void UartDmaIsr(uint8_t port,struct UartFifo pfifo,USART_TypeDef uart) { } / /************************************************************************************************ * Name : UartSeting * Describe : * param : * Return : * Create by : 罗一鸣 Date: 2013-06-18 * Moid by : ***********************************************************************************************/ void UartSeting(uint8_t port,uart_seting_t seting) { UartDevice[port].uart = USART_TABLE[port]; UartDevice[port].rxdma = NULL; UartDevice[port].txdma = NULL; UartDevice[port].fifo.rxCnt = UartDevice[port].fifo.txCnt = 0; UartDevice[port].fifo.rxPush = UartDevice[port].fifo.rxPop = 0; UartDevice[port].fifo.txPush = UartDevice[port].fifo.txPop = 0; UartDevice[port].fifo.rxSize = seting.rxSize; UartDevice[port].fifo.rxBuf = seting.rxBuf; UartDevice[port].fifo.txSize = seting.txSize; UartDevice[port].fifo.txBuf = seting.txBuf; UartDevice[port].fifo.isr = seting.isr; UartDevice[port].fifo.msg = seting.msg; if(seting.rxdma) { UartDevice[port].rxdma = UART_DMA_RX_TABLE[port]; } if(seting.txdma) { UartDevice[port].txdma = UART_DMA_TX_TABLE[port]; } USART_Init(UartDevice[port].uart, &seting.init); } /*********************************************************************************************** * Name : UartRead * Describe : * param : * Return : * Create by : 罗一鸣 Date: 2012-12-03 * Moid by : ************************************************************************************************/ uint16_t UartRead(uint8_t port,uint8_t data,uint16_t len) { if(UART_PORT_MAX <= port) { return 0; } if((NULL != UartDevice[port].rxdma)) { return 0; } else { return _uart_read_isr(&UartDevice[port].fifo,UartDevice[port].uart,data,len); } } /************************************************************************************************* * Name : UartWrite * Describe : * param : * Return : * Create by : 罗一鸣 Date: 2012-12-03 * Moid by : ************************************************************************************************/ uint16_t UartWrite(uint8_t port,uint8_t data,uint16_t len) { if(UART_PORT_MAX <= port) { return 0; } if((NULL != UartDevice[port].txdma)) { return 0; } else { return _uart_write_isr(&UartDevice[port].fifo,UartDevice[port].uart,data,len); } } /************************************************************************************************* * Name : UartRxCnt * Describe : * param : * Return : * Create by : * Moid by : ***********************************************************************************************/ uint16_t UartRxCnt(uint8_t port) { return UartDevice[port].fifo.rxCnt; } /*********************************************************************************************** * Name : UartTxCnt * Describe : * param : * Return : * Create by : * Moid by : ***********************************************************************************************/ uint16_t UartTxCnt(uint8_t port) { return UartDevice[port].fifo.txCnt; } /*********************************************************************************************** * Name : UartSetIsrMsg * Describe : send msg to Isr * param : * Return : * Create by : 罗一鸣 Date: 2013-06-18 * Moid by : ************************************************************************************************/ void UartSetIsrMsg(uint8_t port,void msg) { UartDevice[port].fifo.msg = msg; } /************************************************************************************************* * Name : UartInit * Describe : * param : * Return : * Create by : 罗一鸣 Date: 2012-12-03 * Moid by : ***********************************************************************************************/ void UartInit(uint8_t port,uint8_t preprio,uint8_t subprio) { NVIC_InitTypeDef NVIC_InitStructure; GPIO_InitTypeDef GPIO_InitStructure; if(UART_PORT_1 == port) { // config USART1 clock RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 \| RCC_APB2Periph_GPIOA, ENABLE); // Configure USART1 Tx (PA.09) as alternate function push-pull GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOA, &GPIO_InitStructure); // Configure USART1 Rx (PA.10) as input floating GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_Init(GPIOA, &GPIO_InitStructure); // Set Interrupt Priority NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = preprio; NVIC_InitStructure.NVIC_IRQChannelSubPriority = subprio; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //CLI(); NVIC_Init(&NVIC_InitStructure); //SEI(); } else if(UART_PORT_2 == port) { // config USART2 clock RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE); // Configure USART2 Tx (PA.02) as alternate function push-pull GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOA, &GPIO_InitStructure); // Configure USART2 Rx (PA.03) as input floating GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_Init(GPIOA, &GPIO_InitStructure); // Set Interrupt Priority NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = preprio; NVIC_InitStructure.NVIC_IRQChannelSubPriority = subprio; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //CLI(); NVIC_Init(&NVIC_InitStructure); //SEI(); } else if(UART_PORT_3 == port) { // config USART3 clock RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE); // Configure USART2 Tx (PB.10) as alternate function push-pull GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOB, &GPIO_InitStructure); // Configure USART2 Rx (PB.11) as input floating GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_Init(GPIOB, &GPIO_InitStructure); // Set Interrupt Priority NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = preprio; NVIC_InitStructure.NVIC_IRQChannelSubPriority = subprio; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //CLI(); NVIC_Init(&NVIC_InitStructure); //SEI(); } } /************************************************************************ *********************** End of File ********************************* *************************************************************************/ 复制代码* 0
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