【全部身价悬赏】Can通讯，9个Can节点中一个节点错误引发的巨大问题

Wilmer · 发表于 2020-12-5 11:19:45

本帖最后由 Wilmer 于 2020-12-8 09:49 编辑

最近做的一个项目，我设备有9个can，一个can作主机去循环召唤下面8个can作从机的数据（所有设备能正常收发）。当人为把从机的一个can通讯线给断掉，再把它重新接上之后，会出现主机can发送邮箱已满，无法继续发送的问题，重启一下主机程序之后，就可正常使用了，所以可排除硬件问题（已有匹配电阻）

can配置如下
void MX_CAN_Init(void)
{

hcan.Instance = CAN;
hcan.Init.Prescaler = 8;
hcan.Init.Mode = CAN_MODE_NORMAL;
hcan.Init.SyncJumpWidth = CAN_SJW_1TQ;
hcan.Init.TimeSeg1 = CAN_BS1_6TQ;
hcan.Init.TimeSeg2 = CAN_BS2_1TQ;
hcan.Init.TimeTriggeredMode = DISABLE;
hcan.Init.AutoBusOff = DISABLE;
hcan.Init.AutoWakeUp = DISABLE;
hcan.Init.AutoRetransmission = DISABLE;
hcan.Init.ReceiveFifoLocked = DISABLE;
hcan.Init.TransmitFifoPriority = DISABLE;

if (HAL_CAN_Init(&hcan) != HAL_OK)
{
_Error_Handler(__FILE__, __LINE__);
}

}

HAL_StatusTypeDef HAL_CAN_AddTxMessage(CAN_HandleTypeDef *hcan, CAN_TxHeaderTypeDef *pHeader, uint8_t aData[], uint32_t *pTxMailbox)
{
uint32_t transmitmailbox;
HAL_CAN_StateTypeDef state = hcan->State;
uint32_t tsr = READ_REG(hcan->Instance->TSR);
/* Check the parameters */
assert_param(IS_CAN_IDTYPE(pHeader->IDE));
assert_param(IS_CAN_RTR(pHeader->RTR));
assert_param(IS_CAN_DLC(pHeader->DLC));
if (pHeader->IDE == CAN_ID_STD)
{
assert_param(IS_CAN_STDID(pHeader->StdId));
}
else
{
assert_param(IS_CAN_EXTID(pHeader->ExtId));
}
assert_param(IS_FUNCTIONAL_STATE(pHeader->TransmitGlobalTime));
if ((state == HAL_CAN_STATE_READY) ||
(state == HAL_CAN_STATE_LISTENING))
{
/* Check that all the Tx mailboxes are not full */
if (((tsr & CAN_TSR_TME0) != 0U) ||
((tsr & CAN_TSR_TME1) != 0U) ||
((tsr & CAN_TSR_TME2) != 0U))
{
/* Select an empty transmit mailbox */
transmitmailbox = (tsr & CAN_TSR_CODE) >> CAN_TSR_CODE_Pos;
/* Check transmit mailbox value */
if (transmitmailbox > 2U)
{
/* Update error code */
hcan->ErrorCode |= HAL_CAN_ERROR_INTERNAL;
return HAL_ERROR;
}
/* Store the Tx mailbox */
*pTxMailbox = (uint32_t)1 << transmitmailbox;
/* Set up the Id */
if (pHeader->IDE == CAN_ID_STD)
{
hcan->Instance->sTxMailBox[transmitmailbox].TIR = ((pHeader->StdId << CAN_TI0R_STID_Pos) |
pHeader->RTR);
}
else
{
hcan->Instance->sTxMailBox[transmitmailbox].TIR = ((pHeader->ExtId << CAN_TI0R_EXID_Pos) |
pHeader->IDE |
pHeader->RTR);
}
/* Set up the DLC */
hcan->Instance->sTxMailBox[transmitmailbox].TDTR = (pHeader->DLC);
/* Set up the Transmit Global Time mode */
if (pHeader->TransmitGlobalTime == ENABLE)
{
SET_BIT(hcan->Instance->sTxMailBox[transmitmailbox].TDTR, CAN_TDT0R_TGT);
}
/* Set up the data field */
WRITE_REG(hcan->Instance->sTxMailBox[transmitmailbox].TDHR,
((uint32_t)aData[7] << CAN_TDH0R_DATA7_Pos) |
((uint32_t)aData[6] << CAN_TDH0R_DATA6_Pos) |
((uint32_t)aData[5] << CAN_TDH0R_DATA5_Pos) |
((uint32_t)aData[4] << CAN_TDH0R_DATA4_Pos));
WRITE_REG(hcan->Instance->sTxMailBox[transmitmailbox].TDLR,
((uint32_t)aData[3] << CAN_TDL0R_DATA3_Pos) |
((uint32_t)aData[2] << CAN_TDL0R_DATA2_Pos) |
((uint32_t)aData[1] << CAN_TDL0R_DATA1_Pos) |
((uint32_t)aData[0] << CAN_TDL0R_DATA0_Pos));
/* Request transmission */
SET_BIT(hcan->Instance->sTxMailBox[transmitmailbox].TIR, CAN_TI0R_TXRQ);
/* Return function status */
return HAL_OK;
}
else
{
/* Update error code */
hcan->ErrorCode |= HAL_CAN_ERROR_PARAM; <font color="#ff0000">//程序死在了这里</font>
return HAL_ERROR;
}
}
else
{
/* Update error code */
hcan->ErrorCode |= HAL_CAN_ERROR_NOT_INITIALIZED;
return HAL_ERROR;
}
}