STM32

STM32 上移植 FreeModbus RTU

2020-02-29 10:44发布

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解压 freemodbus v1.6 源码 看到如下文件目录结构  
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stm32jy
2020-03-02 08:00
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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