STM32F767 CAN BAUD RATE QUESTION

只看该作者 · 2022-7-8 09:20

使用can1原来使用baud rate:1Mbit,通讯正常

改为:250k ,就无法正常收发数据,请各位帮忙看看问题点所在

#if 0
   Can1_Handle.Instance = CAN1;
   Can1_Handle.Init.Prescaler = 6;
   Can1_Handle.Init.Mode = CAN_MODE_NORMAL;
   Can1_Handle.Init.SyncJumpWidth = CAN_SJW_1TQ;
   Can1_Handle.Init.TimeSeg1 = CAN_BS1_5TQ;
   Can1_Handle.Init.TimeSeg2 = CAN_BS2_3TQ;
   Can1_Handle.Init.TimeTriggeredMode = DISABLE;
   Can1_Handle.Init.AutoBusOff = ENABLE;
   Can1_Handle.Init.AutoWakeUp = ENABLE;
   Can1_Handle.Init.AutoRetransmission = DISABLE;
   Can1_Handle.Init.ReceiveFifoLocked = DISABLE;
   Can1_Handle.Init.TransmitFifoPriority = DISABLE;
   if (HAL_CAN_Init(&Can1_Handle) != HAL_OK)
   {
      Error_Handler();
   }
  #endif
  //250kbps --> CAN_BS1_7TQ ,CAN_BS2_1TQ  ,Prescaler =24
   #if 1
   Can1_Handle.Instance = CAN1;
   Can1_Handle.Init.Prescaler = 24;
   Can1_Handle.Init.Mode = CAN_MODE_NORMAL;
   Can1_Handle.Init.SyncJumpWidth = CAN_SJW_1TQ;
   Can1_Handle.Init.TimeSeg1 = CAN_BS1_7TQ;
   Can1_Handle.Init.TimeSeg2 = CAN_BS2_1TQ;
   Can1_Handle.Init.TimeTriggeredMode = DISABLE;
   Can1_Handle.Init.AutoBusOff = ENABLE;
   Can1_Handle.Init.AutoWakeUp = ENABLE;
   Can1_Handle.Init.AutoRetransmission = DISABLE;
   Can1_Handle.Init.ReceiveFifoLocked = DISABLE;
   Can1_Handle.Init.TransmitFifoPriority = DISABLE;
   if (HAL_CAN_Init(&Can1_Handle) != HAL_OK)
   {
      Error_Handler();
   }
#endif

2万 · 2022-7-9 09:00

找一个工具，算一下这三个参数的配置，或者找一下主频相同的例程的配置，只修改分频参数，可能时钟有偏差。
   Can1_Handle.Init.SyncJumpWidth = CAN_SJW_1TQ;
   Can1_Handle.Init.TimeSeg1 = CAN_BS1_5TQ;
   Can1_Handle.Init.TimeSeg2 = CAN_BS2_3TQ;