STM32F103 5 serial ports used simultaneously

Hardware platform: STM32F103 (with 5 serial ports)

5 serial ports work simultaneously without packet loss-_-

Related macro definitions

typedef enum

{

    UartPort1,

    UartPort2,

    UartPort3,

    UartPort4,

    UartPort5,

    UartPort_USB,

}UARTPORT;

#define RXTIMEOUT 10 // Receive timeout. If no data is received within 10mSec, it will be considered as a received packet.

#define UART_TXBUFFERLEN 0x100 //Send buffer size

#define UART_RXBUFFERLEN 0x400 //Receive buffer size

typedef struct

{

    //take over

    volatile Uint       rxHead;

    volatile Uint       rxTail;

    volatile Uchar      rxBuf[UART_RXBUFFERLEN];

    volatile Uchar      rxTimeOut_Base;

    volatile Uchar      rxTimeOut;

    //send

    volatile Uint       txHead;

    volatile Uint       txTail;

    volatile BOOLEAN    txEmpty;

    volatile Uchar baudrate;

    volatile Volatile txIdleTimeOut;

    volatile Uchar      txIdleTimeOut_Base;

    volatile Volatile txBuf[UART_TXBUFFERLEN];

}UART_STRUCT;

static UART_STRUCT uart1;

static UART_STRUCT uart2;

static UART_STRUCT uart3;

static UART_STRUCT uart4;

static UART_STRUCT uart5;

Serial port 1 initialization

    USART_InitTypeDef USART_InitStruct;

    GPIO_InitTypeDef GPIO_InitStruct;

    NVIC_InitTypeDef NVIC_InitStruct;

    RCC_APB2PeriphClockCmd( RCC_APB2Periph_USART1, ENABLE );

    GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;

    /* Configure USART1 Tx (PA9) as alternate function push-pull */

    GPIO_InitStruct.GPIO_Pin = PIN_USART1_TXD;

    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;

    GPIO_Init( PORT_USART1_TXD, &GPIO_InitStruct );

    /* Configure USART1 Rx (PA10) as input floating */

    GPIO_InitStruct.GPIO_Pin = PIN_USART1_RXD;

    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN_FLOATING;

    GPIO_Init( PORT_USART1_RXD, &GPIO_InitStruct );

    USART_StructInit(&USART_InitStruct);

    USART_InitStruct.USART_BaudRate = 115200;

    USART_InitStruct.USART_WordLength = USART_WordLength_8b;

    USART_InitStruct.USART_StopBits = USART_StopBits_1;

    USART_InitStruct.USART_Parity = USART_Parity_No ;

    USART_InitStruct.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;

    USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;

    USART_Init(USART1, &USART_InitStruct);

    /* Enable the USARTx Interrupt */

#if 1

// USART_ITConfig(USART2, USART_IT_TXE, ENABLE);

    USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);

    NVIC_InitStruct.NVIC_IRQChannel = USART1_IRQn;

    NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0;

    NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0;

    NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;

    NVIC_Init(&NVIC_InitStruct);

#endif

    USART_Cmd(USART1, ENABLE);

Serial port 2 initialization

    USART_InitTypeDef USART_InitStruct;

    GPIO_InitTypeDef GPIO_InitStruct;

    NVIC_InitTypeDef NVIC_InitStruct;

    RCC_APB1PeriphClockCmd( RCC_APB1Periph_USART2, ENABLE );

    GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;

    /* Configure USART2 CTS (PA0) as input floating */

#if UART2_HARDWARE_FLOW

    GPIO_InitStruct.GPIO_Pin = PIN_USART2_CTS;

    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN_FLOATING;

    GPIO_Init( PORT_USART2_CTS, &GPIO_InitStruct );

#endif

    /* Configure USART2 Rx (PA3) as input floating */

    GPIO_InitStruct.GPIO_Pin = PIN_USART2_RXD;

    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN_FLOATING;

    GPIO_Init( PORT_USART2_RXD, &GPIO_InitStruct );

    /* Configure USART2 RTS (PA1) as alternate function push-pull */

#if UART2_HARDWARE_FLOW

    GPIO_InitStruct.GPIO_Pin = PIN_USART2_RTS;

    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;

    GPIO_Init( PORT_USART2_RTS, &GPIO_InitStruct );

#endif

    /* Configure USART2 Tx (PA2) as alternate function push-pull */

    GPIO_InitStruct.GPIO_Pin = PIN_USART2_TXD;

    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;

    GPIO_Init( PORT_USART2_TXD, &GPIO_InitStruct );

    USART_StructInit(&USART_InitStruct);

    USART_InitStruct.USART_BaudRate = 115200;

    USART_InitStruct.USART_WordLength = USART_WordLength_8b;

    USART_InitStruct.USART_StopBits = USART_StopBits_1;

    USART_InitStruct.USART_Parity = USART_Parity_No ;

    USART_InitStruct.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;

#if UART2_HARDWARE_FLOW

    USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_RTS;

#else

    USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;

#endif

    USART_Init(USART2, &USART_InitStruct);

#if 1

// USART_ITConfig(USART2, USART_IT_TXE, ENABLE);

    USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);

    NVIC_InitStruct.NVIC_IRQChannel = USART2_IRQn;

    NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0;

    NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0;

    NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;

    NVIC_Init(&NVIC_InitStruct);

#endif

    USART_Cmd(USART2, ENABLE);

Serial port 3 initialization

    USART_InitTypeDef USART_InitStruct;

    GPIO_InitTypeDef GPIO_InitStruct;

    NVIC_InitTypeDef NVIC_InitStruct;

    RCC_APB1PeriphClockCmd( RCC_APB1Periph_USART3, ENABLE );

    GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;

    /* Configure USART1 Tx (PC10) as alternate function push-pull */

    GPIO_InitStruct.GPIO_Pin = PIN_UART3_TXD;

    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;

    GPIO_Init( PORT_UART3_TXD, &GPIO_InitStruct );

    /* Configure USART1 Rx (PC11) as input floating */

    GPIO_InitStruct.GPIO_Pin = PIN_UART3_RXD;

    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN_FLOATING;

    GPIO_Init( PORT_UART3_RXD, &GPIO_InitStruct );

    USART_StructInit(&USART_InitStruct);

    USART_InitStruct.USART_BaudRate = 115200;

    USART_InitStruct.USART_WordLength = USART_WordLength_8b;

    USART_InitStruct.USART_StopBits = USART_StopBits_1;

    USART_InitStruct.USART_Parity = USART_Parity_No ;

    USART_InitStruct.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;

    USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;

    USART_Init(USART3, &USART_InitStruct);

    /* Enable the USARTx Interrupt */

#if 1

    USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);

    NVIC_InitStruct.NVIC_IRQChannel = USART3_IRQn;

    NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0;

    NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0;

    NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;

    NVIC_Init(&NVIC_InitStruct);

#endif

    USART_Cmd(USART3, ENABLE);

Serial port 4 initialization

    USART_InitTypeDef USART_InitStruct;

    GPIO_InitTypeDef GPIO_InitStruct;

    NVIC_InitTypeDef NVIC_InitStruct;

    RCC_APB1PeriphClockCmd( RCC_APB1Periph_UART4, ENABLE );

    GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;

#if 0

    GPIO_InitStruct.GPIO_Pin = PIN_UART4_CTS;

    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN_FLOATING;

    GPIO_Init( PORT_UART4_CTS, &GPIO_InitStruct );

//    GPIO_ResetBits(PORT_UART4_CTS,PIN_UART4_CTS);

#endif

    /* Configure USART1 Tx (PC10) as alternate function push-pull */

    GPIO_InitStruct.GPIO_Pin = PIN_UART4_TXD;

    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;

    GPIO_Init( PORT_UART4_TXD, &GPIO_InitStruct );

    /* Configure USART1 Rx (PC11) as input floating */

    GPIO_InitStruct.GPIO_Pin = PIN_UART4_RXD;

    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN_FLOATING;

    GPIO_Init( PORT_UART4_RXD, &GPIO_InitStruct );

    USART_StructInit(&USART_InitStruct);

    USART_InitStruct.USART_BaudRate = 115200;

    USART_InitStruct.USART_WordLength = USART_WordLength_8b;

    USART_InitStruct.USART_StopBits = USART_StopBits_1;

    USART_InitStruct.USART_Parity = USART_Parity_No ;

    USART_InitStruct.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;

    USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;

    USART_Init(UART4, &USART_InitStruct);

    /* Enable the USARTx Interrupt */

#if 1

// USART_ITConfig(USART2, USART_IT_TXE, ENABLE);

    USART_ITConfig(UART4, USART_IT_RXNE, ENABLE);

    NVIC_InitStruct.NVIC_IRQChannel = UART4_IRQn;

    NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0;

    NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0;

    NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;

    NVIC_Init(&NVIC_InitStruct);

#endif

    USART_Cmd(UART4, ENABLE);

Serial port 5 initialization

    USART_InitTypeDef USART_InitStruct;

    GPIO_InitTypeDef GPIO_InitStruct;

    NVIC_InitTypeDef NVIC_InitStruct;

    RCC_APB1PeriphClockCmd( RCC_APB1Periph_UART5, ENABLE );

    GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;

    /* Configure USART1 Tx (PC10) as alternate function push-pull */

    GPIO_InitStruct.GPIO_Pin = PIN_UART5_TXD;

    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_PP;

    GPIO_Init( PORT_UART5_TXD, &GPIO_InitStruct );

    /* Configure USART1 Rx (PC11) as input floating */

    GPIO_InitStruct.GPIO_Pin = PIN_UART5_RXD;

    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN_FLOATING;

    GPIO_Init( PORT_UART5_RXD, &GPIO_InitStruct );

    USART_StructInit(&USART_InitStruct);

    USART_InitStruct.USART_BaudRate = 115200;

    USART_InitStruct.USART_WordLength = USART_WordLength_8b;

    USART_InitStruct.USART_StopBits = USART_StopBits_1;

    USART_InitStruct.USART_Parity = USART_Parity_No ;

    USART_InitStruct.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;

    USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;

    USART_Init(UART5, &USART_InitStruct);

    /* Enable the USARTx Interrupt */

#if 1

    USART_ITConfig(UART5, USART_IT_RXNE, ENABLE);

    NVIC_InitStruct.NVIC_IRQChannel = UART5_IRQn;

    NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0;

    NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0;

    NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;

    NVIC_Init(&NVIC_InitStruct);

#endif

    USART_Cmd(UART5, ENABLE);

Interrupt handling

void USART_Irq_Function(UART_STRUCT *uart,USART_TypeDef *uartdef)

{

    //Receive data USART_ GetITStatus

    while (USART_GetITStatus(uartdef, USART_IT_RXNE))

    {

        Flying tempo;

        USART_ClearFlag(uartdef, USART_FLAG_RXNE | USART_FLAG_ORE);

        temp = USART_ReceiveData(uartdef);

        if (((uart->rxHead + 1) % UART_RXBUFFERLEN) != uart->rxTail)

        {

            uart->rxBuf[uart->rxHead] = temp;

            uart->rxHead = (uart->rxHead + 1) % UART_RXBUFFERLEN;

            uart->rxTimeOut = uart->rxTimeOut_Base;

        }

    }

    //send data

    if (USART_GetITStatus(uartdef,USART_IT_TXE))

    {

        // USART_ClearFlag(uartdef, USART_FLAG_TXE);

        if (uart->txHead == uart->txTail)

        {

            uart->txEmpty = TRUE;

            USART_ITConfig(uartdef, USART_IT_TXE, DISABLE);

        }

        else

        {

            USART_SendData(uartdef, uart->txBuf[uart->txTail]);

            uart->txTail = (uart->txTail + 1) & (UART_TXBUFFERLEN - 1);

            uart->txIdleTimeOut = uart->txIdleTimeOut_Base;

        }

    }

}

extern void USART1_IRQHandler(void)

{

    USART_Irq_Function(&uart1,USART1);

}

extern void USART2_IRQHandler(void)

{

    USART_Irq_Function(&uart2,USART2);

}

extern void USART3_IRQHandler(void)

{

#ifdef INCLUDE_UARTPORT3

    USART_Irq_Function(&uart3,USART3);

#endif

}

extern void UART4_IRQHandler(void)

{

#ifdef INCLUDE_UARTPORT4

    USART_Irq_Function(&uart4,UART4);

#endif

}

extern void UART5_IRQHandler(void)

{

#ifdef INCLUDE_UARTPORT5

    USART_Irq_Function(&uart5,UART5);

#endif

}

Timeout Check

//Function: Check if a data packet has been received, called once every 1ms

//Parameters None

//Return: None

extern void checkUartRxTimeOut()

{

    if (uart1.rxTimeOut)

    {

        if (--uart1.rxTimeOut == 0)

        {

            pushEvent(evCOM1,uart1.rxHead);

        }

    }

    if (uart2.rxTimeOut)

    {

        if (--uart2.rxTimeOut == 0)

        {

            pushEvent(evCOM2,uart2.rxHead);

        }

    }

    if (uart3.rxTimeOut)

    {

        if (--uart3.rxTimeOut == 0)

        {

            pushEvent(evCOM3,uart3.rxHead);

        }

    }

    if (uart4.rxTimeOut)

    {

        if (--uart4.rxTimeOut == 0)

        {

            pushEvent(evCOM4,uart4.rxHead);

        }

    }

    if (uart5.rxTimeOut)

    {

        if (--uart5.rxTimeOut == 0)

        {

            pushEvent(evCOM5,uart5.rxHead);

        }

    }

    if (uart1.txIdleTimeOut) uart1.txIdleTimeOut--;

    if (uart2.txIdleTimeOut) uart2.txIdleTimeOut--;

#ifdef INCLUDE_UARTPORT3

    if (uart3.txIdleTimeOut) uart3.txIdleTimeOut--;

#endif

#ifdef INCLUDE_UARTPORT4

    if (uart4.txIdleTimeOut) uart4.txIdleTimeOut--;

#endif

#ifdef INCLUDE_UARTPORT5

    if (uart5.txIdleTimeOut) uart5.txIdleTimeOut--;

#endif

}