TrainCamp_fubowen_Modbus/modbus/modbus.c

#include "stm32f4xx.h"
#include "hardware.h"
#include "ucos_ii.h"
#include "os.h"
#include "app_cfg.h"
#include "sys_cfg.h"

extern OS_EVENT* ModbusReceived;       /*接收到modbus请求报文*/
extern OS_EVENT* ModbusAssembled;      /*modbus响应帧组装完成*/

/*USART接收空闲中断*/
void USART1_IRQHandler(void)
{
    OSIntEnter();   /*进入中断*/

    uint32_t temp;
    uint16_t rxLenRemain;
    
    if(USART_GetITStatus(USART1, USART_IT_IDLE) == SET)
    {
        /*在计算数据长度之前先关闭DMA接收通道，防止计算过程中DMA继续转运数据*/
        DMA_Cmd(DMA2_Stream2, DISABLE);
        
        /*清除IDLE中断标志位*/
        temp = USART1->SR;
        temp = USART1->DR;
        (void)temp;

        /*清除传输已经完成TCIF2、传输已经完成一半HTIF2标志位*/
        DMA_ClearFlag(DMA2_Stream2, DMA_FLAG_TCIF2 | DMA_FLAG_HTIF2);
        
        /*计算数据长度*/
        rxLenRemain = DMA_GetCurrDataCounter(DMA2_Stream2);
        ModbusRxLen = MODBUS_RX_BUF_SIZE - rxLenRemain;

        if(ModbusRxLen != 0)
        {
            OSSemPost(ModbusReceived);
        }
        
        /*重新指定接收地址*/
        DMA_MemoryTargetConfig(DMA2_Stream2, (uint32_t)ModbusRxBuf, DMA_Memory_0);
        /*重启DMA*/
        DMA_SetCurrDataCounter(DMA2_Stream2, MODBUS_RX_BUF_SIZE);
        DMA_Cmd(DMA2_Stream2, ENABLE);
    }
    
    OSIntExit();    /*退出中断*/
}


/*modbus响应帧发送*/
void ModbusSend(uint8_t *txBuf, uint16_t len)
{
    /*先关闭DMA发送通道*/
    DMA_Cmd(DMA2_Stream7, DISABLE);

    /*等待DMA关闭*/
    while (DMA_GetCmdStatus(DMA2_Stream7) != DISABLE); 

    /*清除传输已经完成TCIF7、传输已经完成一半HTIF7、FIFO错误FEIF7标志位*/
    DMA_ClearFlag(DMA2_Stream7, DMA_FLAG_FEIF7 | DMA_FLAG_HTIF7 | DMA_FLAG_TCIF7);
    
    /*配置发送地址和长度*/
    DMA_MemoryTargetConfig(DMA2_Stream7, (uint32_t)txBuf, DMA_Memory_0);     
    DMA_SetCurrDataCounter(DMA2_Stream7, len);
    
    /*启动 DMA 发送*/
    DMA_Cmd(DMA2_Stream7, ENABLE);
}


/*modbus协议帧解析任务*/
void AppTaskModbusParse (void *p_arg)
{
    while(1)
    {
        OSTimeDly(OS_TICKS_PER_SEC); 
    }
     
    
}