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freemodbus主机在freertos的适配,参考rtthread例程

发布于 2024-11-29 11:53:18 浏览：124 订阅该版

port.c

```c

/* ----------------------- System includes --------------------------------*/
#include "FreeRTOS.h"
#include "semphr.h"
#include <cm_backtrace.h>

/* ----------------------- Modbus includes ----------------------------------*/
#include "port.h"

/* ----------------------- Variables ----------------------------------------*/
static SemaphoreHandle_t lock = NULL;
static int is_inited = 0;

/* ----------------------- Start implementation -----------------------------*/
void EnterCriticalSection(void)
{
    if (!is_inited)
    {
        // 创建一个计数信号量，初始值为1，表示最多允许一个任务进入临界区
        lock = xSemaphoreCreateCounting(1, 1); // 创建一个计数信号量
        CMB_ASSERT(lock != NULL);
        is_inited = 1;
    }

xSemaphoreTake(lock, portMAX_DELAY);  // 阻塞直到信号量被释放
}

void ExitCriticalSection(void)
{
    // 释放信号量，其他任务可以获取信号量并进入临界区
    CMB_ASSERT(lock != NULL);
    xSemaphoreGive(lock);
}

```

port.h

```c

#ifndef _PORT_H
#define _PORT_H

#include "mbconfig.h"

#include "FreeRTOS.h"
#include <cm_backtrace.h>

#define INLINE
#define PR_BEGIN_EXTERN_C           extern "C" {
#define PR_END_EXTERN_C             }

#define ENTER_CRITICAL_SECTION()    EnterCriticalSection()
#define EXIT_CRITICAL_SECTION()     ExitCriticalSection()

typedef uint8_t FMB_BOOL;

typedef unsigned char UCHAR;
typedef char    CHAR;

typedef uint16_t USHORT;
typedef int16_t SHORT;

typedef uint32_t ULONG;
typedef int32_t LONG;

#ifndef TRUE
#define TRUE            1
#endif

#ifndef FALSE
#define FALSE           0
#endif

void EnterCriticalSection(void);
void ExitCriticalSection(void);

#endif

```

portevent_m.c

```c
/* ----------------------- System includes --------------------------------*/
#include "FreeRTOS.h"
#include "semphr.h"
#include "event_groups.h"
#include <cm_backtrace.h>

/* ----------------------- Modbus includes ----------------------------------*/
#include "mb.h"
#include "mb_m.h"
#include "mbport.h"
#include "port.h"

#if MB_MASTER_RTU_ENABLED > 0 || MB_MASTER_ASCII_ENABLED > 0

/* ----------------------- Defines ------------------------------------------*/
/* ----------------------- Variables ----------------------------------------*/
static SemaphoreHandle_t xMasterRunRes;
static EventGroupHandle_t xMasterOsEvent;

/* ----------------------- Start implementation -----------------------------*/

FMB_BOOL xMBMasterPortEventInit(void)
{
    /* Initialize event group */
    xMasterOsEvent = xEventGroupCreate();
    CMB_ASSERT(xMasterOsEvent != NULL);

return TRUE;
}

FMB_BOOL xMBMasterPortEventPost(eMBMasterEventType eEvent)
{
    /* Post event to event group */
    xEventGroupSetBits(xMasterOsEvent, eEvent);
    return TRUE;
}

FMB_BOOL xMBMasterPortEventGet(eMBMasterEventType *eEvent)
{
    EventBits_t uxBits;
    
    /* Wait for event forever */
    uxBits = xEventGroupWaitBits(xMasterOsEvent,
                                 EV_MASTER_READY | EV_MASTER_FRAME_RECEIVED |
                                 EV_MASTER_EXECUTE | EV_MASTER_FRAME_SENT |
                                 EV_MASTER_ERROR_PROCESS,
                                 pdTRUE, pdFALSE, portMAX_DELAY);

/* Check which event occurred */
    if (uxBits & EV_MASTER_READY)
    {
        *eEvent = EV_MASTER_READY;
    }
    else if (uxBits & EV_MASTER_FRAME_RECEIVED)
    {
        *eEvent = EV_MASTER_FRAME_RECEIVED;
    }
    else if (uxBits & EV_MASTER_EXECUTE)
    {
        *eEvent = EV_MASTER_EXECUTE;
    }
    else if (uxBits & EV_MASTER_FRAME_SENT)
    {
        *eEvent = EV_MASTER_FRAME_SENT;
    }
    else if (uxBits & EV_MASTER_ERROR_PROCESS)
    {
        *eEvent = EV_MASTER_ERROR_PROCESS;
    }
    else
    {
        *eEvent = EV_MASTER_FRAME_RECEIVED;
    }
    
    return TRUE;
}

/**
 * This function is initialize the OS resource for modbus master.
 * Note: The resource is defined by OS. If you do not use OS, this function can be empty.
 *
 */
void vMBMasterOsResInit(void)
{
    /* Initialize the semaphore for master resource */
    xMasterRunRes = xSemaphoreCreateBinary();
    CMB_ASSERT(xMasterRunRes != NULL);
    xSemaphoreGive(xMasterRunRes);  // Release the semaphore initially
}

/**
 * This function is take Modbus Master running resource.
 * Note: The resource is defined by Operating System. If you do not use OS, this function can just return TRUE.
 *
 * @param lTimeOut the waiting time.
 *
 * @return resource taken result
 */
FMB_BOOL xMBMasterRunResTake(LONG lTimeOut)
{
    /* If waiting time is -1, it will wait forever */
    return xSemaphoreTake(xMasterRunRes, pdMS_TO_TICKS(lTimeOut)) == pdTRUE ? TRUE : FALSE;
}

/**
 * This function is release Modbus Master running resource.
 * Note: The resource is defined by Operating System. If you do not use OS, this function can be empty.
 *
 */
void vMBMasterRunResRelease(void)
{
    /* Release the semaphore */
    xSemaphoreGive(xMasterRunRes);
}

/**
 * This is Modbus master respond timeout error process callback function.
 * @note There functions will block Modbus master poll while executing OS waiting.
 * So, for real-time of the system, do not execute too much waiting process.
 *
 * @param ucDestAddress destination slave address
 * @param pucPDUData PDU buffer data
 * @param ucPDULength PDU buffer length
 *
 */
void vMBMasterErrorCBRespondTimeout(UCHAR ucDestAddress, const UCHAR* pucPDUData,
        USHORT ucPDULength)
{
    /**
     * @note This code is use OS's event mechanism for modbus master protocol stack.
     * If you don't use OS, you can change it.
     */
    xEventGroupSetBits(xMasterOsEvent, EV_MASTER_ERROR_RESPOND_TIMEOUT);

/* You can add your custom error handling code here */
}

/**
 * This is Modbus master receive data error process callback function.
 * @note These functions will block Modbus master poll while executing OS waiting.
 * So, for real-time of the system, do not execute too much waiting process.
 *
 * @param ucDestAddress destination slave address
 * @param pucPDUData PDU buffer data
 * @param ucPDULength PDU buffer length
 *
 */
void vMBMasterErrorCBReceiveData(UCHAR ucDestAddress, const UCHAR* pucPDUData,
        USHORT ucPDULength) {
    /**
     * @note This code is use OS's event mechanism for modbus master protocol stack.
     * If you don't use OS, you can change it.
     */
    xEventGroupSetBits(xMasterOsEvent, EV_MASTER_ERROR_RECEIVE_DATA);

/* You can add your custom error handling code here */
}

/**
 * This is Modbus master execute function error process callback function.
 * @note These functions will block Modbus master poll while executing OS waiting.
 * So, for real-time of the system, do not execute too much waiting process.
 *
 * @param ucDestAddress destination slave address
 * @param pucPDUData PDU buffer data
 * @param ucPDULength PDU buffer length
 *
 */
void vMBMasterErrorCBExecuteFunction(UCHAR ucDestAddress, const UCHAR* pucPDUData,
        USHORT ucPDULength)
{
    /* Use event mechanism for Modbus master protocol stack */
    xEventGroupSetBits(xMasterOsEvent, EV_MASTER_ERROR_EXECUTE_FUNCTION);

/* You can add your custom error handling code here */
}

/**
 * This is Modbus master request process success callback function.
 * @note These functions will block Modbus master poll while executing OS waiting.
 * So, for real-time of the system, do not execute too much waiting process.
 *
 */
void vMBMasterCBRequestScuuess(void)
{
    /* Use event mechanism for Modbus master protocol stack */
    xEventGroupSetBits(xMasterOsEvent, EV_MASTER_PROCESS_SUCESS);

/* You can add your custom code here */
}

/**
 * This function is wait for Modbus master request finish and return result.
 * Waiting result includes request process success, request respond timeout,
 * receive data error and execute function error. You can use the above callback function.
 * @note If you are using OS, you can use OS's event mechanism. Otherwise, you have to run
 * much user custom delay for waiting.
 *
 * @return request error code
 */
eMBMasterReqErrCode eMBMasterWaitRequestFinish(void)
{
    eMBMasterReqErrCode eErrStatus = MB_MRE_NO_ERR;
    EventBits_t uxBits;
    
    /* Wait for OS event */
    uxBits = xEventGroupWaitBits(xMasterOsEvent,
                                 EV_MASTER_PROCESS_SUCESS | EV_MASTER_ERROR_RESPOND_TIMEOUT |
                                 EV_MASTER_ERROR_RECEIVE_DATA |
                                 EV_MASTER_ERROR_EXECUTE_FUNCTION,
                                 pdTRUE, pdFALSE, portMAX_DELAY);
    
    /* Check which event occurred */
    if (uxBits & EV_MASTER_PROCESS_SUCESS)
    {
        // Request processed successfully
    }
    else if (uxBits & EV_MASTER_ERROR_RESPOND_TIMEOUT)
    {
        eErrStatus = MB_MRE_TIMEDOUT;
    }
    else if (uxBits & EV_MASTER_ERROR_RECEIVE_DATA)
    {
        eErrStatus = MB_MRE_REV_DATA;
    }
    else if (uxBits & EV_MASTER_ERROR_EXECUTE_FUNCTION)
    {
        eErrStatus = MB_MRE_EXE_FUN;
    }
    
    return eErrStatus;
}

#endif
```
portserial_m.c

```c
/* ----------------------- System includes --------------------------------*/
#include "FreeRTOS.h"
#include <cm_backtrace.h>

#include "task.h"
#include "queue.h"
#include "event_groups.h"

#include "sdk_uart.h"
#include "serialZ.h"

#include "bll_debug.h"
#include "fml_timebase.h"

/* ----------------------- Platform includes --------------------------------*/
#include "port.h"

/* ----------------------- Modbus includes ----------------------------------*/
#include "mb.h"
#include "mbport.h"

uint8 serial_soft_rec_enable = 0;

#if MB_MASTER_RTU_ENABLED > 0 || MB_MASTER_ASCII_ENABLED > 0
/* ----------------------- Static variables ---------------------------------*/
/* software simulation serial transmit IRQ handler task handle */
static TaskHandle_t xSerialSoftTransIrqTaskHandle = NULL;
static TaskHandle_t xSerialSoftRecIrqTaskHandle = NULL;
/* serial event group */
static EventGroupHandle_t xSerialEventGroup = NULL;

/* ----------------------- Defines ------------------------------------------*/
/* serial transmit event */
#define EVENT_SERIAL_TRANS_START    (1<<0)

/* ----------------------- static functions ---------------------------------*/
static void prvvUARTTxReadyISR(void);
static void prvvUARTRxISR(void); ///接收
static void serial_soft_trans_irq_task(void *pvParameters); ///发送中断模拟
static void serial_soft_rec_irq_task(void *pvParameters);

/* ----------------------- Start implementation -----------------------------*/
FMB_BOOL xMBMasterPortSerialInit(UCHAR ucPORT, ULONG ulBaudRate, UCHAR ucDataBits,
        eMBParity eParity)
{
    (void)ucPORT;  // 忽略端口号，假设只有一个串口
    (void)ucDataBits;  // 忽略数据位，假设固定为8位
    (void)eParity;  // 忽略校验位，假设固定为无校验

/* initialize zSerial */
    ///sdk_uart3_init(115200);
    serialZ0_init(ulBaudRate);
    /* set receive callback function */
    serialZ0_setRxCallBack(prvvUARTRxISR);  ///接收提醒

/**
     * set 485 mode receive and transmit control IO
     * @note MODBUS_MASTER_RT_CONTROL_PIN_INDEX need be defined by user
     */
#if defined(RT_MODBUS_MASTER_USE_CONTROL_PIN)
    /// rt_pin_mode(MODBUS_MASTER_RT_CONTROL_PIN_INDEX, PIN_MODE_OUTPUT);
#endif

/* initialize FreeRTOS event group */
    xSerialEventGroup = xEventGroupCreate();
    CMB_ASSERT(xSerialEventGroup!=0);

/* create software simulation serial transmit IRQ handler task */
    xTaskCreate(serial_soft_trans_irq_task, "SerialTransIrq", configMINIMAL_STACK_SIZE + 512, NULL, (configMAX_PRIORITIES - 2), &xSerialSoftTransIrqTaskHandle);
    CMB_ASSERT(xSerialSoftTransIrqTaskHandle!=0);

///启动接收中断线程
    if (xTaskCreate(serial_soft_rec_irq_task, "SerialRecIrq", configMINIMAL_STACK_SIZE + 512, NULL, (configMAX_PRIORITIES - 2), &xSerialSoftRecIrqTaskHandle) !=pdPASS)
    {
        CMB_ASSERT(0);
    }

return TRUE;
}

void vMBMasterPortSerialEnable(FMB_BOOL xRxEnable, FMB_BOOL xTxEnable)
{
    if (xRxEnable)
    {
        /* enable RX interrupt */
        serial_soft_rec_enable = 1;
        serialZ0_setRxCallBack(prvvUARTRxISR);  ///接收提醒

/* switch 485 to receive mode */
#if defined(RT_MODBUS_MASTER_USE_CONTROL_PIN)
        rt_pin_write(MODBUS_MASTER_RT_CONTROL_PIN_INDEX, PIN_LOW);
#endif
    }
    else
    {
        /* switch 485 to transmit mode */
#if defined(RT_MODBUS_MASTER_USE_CONTROL_PIN)
        rt_pin_write(MODBUS_MASTER_RT_CONTROL_PIN_INDEX, PIN_HIGH);
#endif
        /* disable RX interrupt */
        serial_soft_rec_enable = 0;
        serialZ0_setRxCallBack(NULL);  ///接收提醒
        
    }

if (xTxEnable)
    {
        /* start serial transmit */
        xEventGroupSetBits(xSerialEventGroup, EVENT_SERIAL_TRANS_START);
    }
    else
    {
        /* stop serial transmit */
        xEventGroupClearBits(xSerialEventGroup, EVENT_SERIAL_TRANS_START);
    }
}

void vMBMasterPortClose(void)
{
    ///serial->parent.close(&(serial->parent));
}

FMB_BOOL xMBMasterPortSerialPutByte(CHAR ucByte)
{
    sdk_uart3_putc((uint8)ucByte);
	///XPRINTF_NONELINE("%c",ucByte);///串口显示
    return TRUE;
}

FMB_BOOL xMBMasterPortSerialGetByte(CHAR * pucByte)
{
    serialZ0_getc((uint8 *)pucByte);
    ///XPRINTF_NONELINE("%c",*pucByte);///串口显示
    return TRUE;
}

/*
 * Create an interrupt handler for the transmit buffer empty interrupt
 * (or an equivalent) for your target processor. This function should then
 * call pxMBFrameCBTransmitterEmpty( ) which tells the protocol stack that
 * a new character can be sent. The protocol stack will then call
 * xMBPortSerialPutByte( ) to send the character.
 */
void prvvUARTTxReadyISR(void)
{
    pxMBMasterFrameCBTransmitterEmpty();
}

/*
 * Create an interrupt handler for the receive interrupt for your target
 * processor. This function should then call pxMBFrameCBByteReceived( ). The
 * protocol stack will then call xMBPortSerialGetByte( ) to retrieve the
 * character.
 */
void prvvUARTRxISR(void)
{
    pxMBMasterFrameCBByteReceived();
}

/**
 * Software simulation serial transmit IRQ handler task.
 *
 * @param pvParameters parameter
 */
static void serial_soft_trans_irq_task(void *pvParameters)
{
    (void)pvParameters;
    while (7)
    {
        /* wait for serial transmit start event */
        EventBits_t xEventBits = xEventGroupWaitBits(xSerialEventGroup, EVENT_SERIAL_TRANS_START, pdFALSE, pdFALSE, portMAX_DELAY);

if ((xEventBits & EVENT_SERIAL_TRANS_START) != 0)
        {
            /// 等待串口发送完毕
            while (!sdk_uart3_getTCFlag()) /// 底层未就绪
            {
                // 使用FreeRTOS延时，等待一段时间后再次检查
                vTaskDelay(pdMS_TO_TICKS(1)); // 延时1毫秒
            }

/* execute modbus callback */
            prvvUARTTxReadyISR();
        }
    }
}

// 模拟接收线程
static void serial_soft_rec_irq_task(void *pvParameters)
{
    for (;;)
    {
        if (serial_soft_rec_enable)
        {
            int result = serialZ0_running(); 
            if (result == 0) // 如果返回值为0，则执行延时
            {
                vTaskDelay(pdMS_TO_TICKS(1));
            }
            // 如果返回值非0，则不执行延时，直接进入下一次循环
        }
        else
        {
            vTaskDelay(pdMS_TO_TICKS(1)); // 如果 serial_soft_rec_enable 为假，则延时
        }
    }
}

#endif

```

[port.7z](https://club.rt-thread.org/file_download/48d586ad51588f65)