发送一个字节函数 BOOL xMBPortSerialPutByte( CHAR ucByte )

1. BOOL
   
2. xMBPortSerialPutByte( CHAR ucByte )
   
3. {
   
4. /* Put a byte in the UARTs transmit buffer. This function is called
   
5. * by the protocol stack if pxMBFrameCBTransmitterEmpty( ) has been
   
6. * called. */
   
7. USART_SendData(USART2, ucByte); //发送一个字节
   
8. return TRUE;
   
9. }

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接收一个字节函数 BOOL xMBPortSerialGetByte( CHAR * pucByte )

1. BOOL
   
2. xMBPortSerialGetByte( CHAR * pucByte )
   
3. {
   
4. /* Return the byte in the UARTs receive buffer. This function is called
   
5. * by the protocol stack after pxMBFrameCBByteReceived( ) has been called.
   
6. */
   
7. *pucByte = USART_ReceiveData(USART2); //接收一个字节
   
8. return TRUE;
   
9. }

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串口中断服务函数 void USART2_IRQHandler(void)

1. void USART2_IRQHandler(void)
   
2. {
   
3. if (USART_GetITStatus(USART2, USART_IT_RXNE) == SET) //接收中断
   
4. {
   
5. prvvUARTRxISR();USART_ClearITPendingBit(USART2, USART_IT_RXNE);
   
6. }
   
7. if (USART_GetITStatus(USART2, USART_IT_TC) == SET) //发送中断
   
8. {
   
9. prvvUARTTxReadyISR();
   
10. USART_ClearITPendingBit(USART2, USART_IT_TC);
    
11. }
    
12. }

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打开 porttimer.c 文件， RTU 模式需要定时器支持，定时器初始化函数

1. BOOL
   
2. xMBPortTimersInit( USHORT usTim1Timerout50us )
   
3. BOOL
   
4. xMBPortTimersInit( USHORT usTim1Timerout50us )
   
5. {
   
6. // return FALSE;
   
7. TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
   
8. NVIC_InitTypeDef NVIC_InitStructure;
   
9. uint16_t PrescalerValue = 0;
   
10. RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
    
11. //
    
12. //HCLK 为 72MHz
    
13. //时基频率 72 / （1 + Prescaler) = 20KHz
    
14. //
    
15. PrescalerValue = (uint16_t)((SystemCoreClock / 20000) - 1);
    
16. //
    
17. //初始化定时器参数
    
18. //
    
19. TIM_TimeBaseStructure.TIM_Period = (uint16_t)usTim1Timerout50us;
    
20. TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue;
    
21. TIM_TimeBaseStructure.TIM_ClockDivision = 0;
    
22. TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    
23. TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
    
24. //
    
25. //使能预装
    
26. //
    
27. TIM_ARRPreloadConfig(TIM2, ENABLE);
    
28. //
    
29. //初始化中断优先级//
    
30. NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
    
31. NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    
32. NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
    
33. NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    
34. NVIC_Init(&NVIC_InitStructure);
    
35. TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
    
36. TIM_ITConfig(TIM2, TIM_IT_Update, DISABLE);
    
37. TIM_Cmd(TIM2, DISABLE);
    
38. return TRUE;
    
39. }

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