KEA128 CAN

lzhjxgz — Sun, 15 Mar 2026 13:33:21 GMT

我用KDS3.0生成库代码，生的CAN代码PE_ISR(CAN1_TxInterrupt)，

ErrorFlags = MSCAN_PDD_GetRxStatusInterruptFlags(MSCAN_BASE_PTR); /* Read the status register */

if (

((ErrorFlags & MSCAN_PDD_RX_BUS_OFF) != MSCAN_PDD_RX_BUS_OFF)|| ((ErrorFlags & MSCAN_PDD_TX_BUS_OFF) != MSCAN_PDD_TX_BUS_OFF)

)

{ /* Is bus-off detected? */

DeviceDataPrv->Stats.BusOffs++; /* Increase BusOffs interrupt counter */

CAN1_OnBusOff(DeviceDataPrv->UserData); /* Invoke user event */

}

MSCAN_PDD_RX_BUS_OFF为0x30，查看手册中 MSCAN_CANRFLG ，bit5-4中为0b11时总线离线，但代码中判断不为0b11则为离线。

LDD_TError CAN1_GetError(LDD_TDeviceData *DeviceDataPtr, LDD_CAN_TErrorMask *ErrorMaskPtr)
{
CAN1_TDeviceData *DeviceDataPrv = (CAN1_TDeviceData *)DeviceDataPtr;

/* {Default RTOS Adapter} Critical section begin, general PE function is used */
EnterCritical();
*ErrorMaskPtr = DeviceDataPrv->ErrorMask; /* Return last value of error mask */
DeviceDataPrv->ErrorMask = 0x00U;
/* {Default RTOS Adapter} Critical section end, general PE function is used */
ExitCritical();
return ERR_OK;
}

DeviceDataPrv->ErrorMask = 0x00U;，查看代码ErrorMask 为内存中数据，为什么ErrorMask 清零后总线可以立刻恢复。

Re: KEA128 CAN

Alice_Yang — Fri, 20 Mar 2026 15:46:04 GMT

HI @lzhjxgz

Thanks for your patience.

1.Regarding “MSCAN_PDD_RX_BUS_OFF为0x30，查看手册中 MSCAN_CANRFLG ，bit5-4中为0b11时总线离线，但代码中判断不为0b11则为离线”,

->> I agree with you — the Bus‑Off detection logic in the code is indeed opposite to what is described in the hardware manual.
Please the code manually and check whether it works correctly. I will also report this issue to the internal team.

2. For second question, I think there is no relationship between clearing ErrorMask and the CAN bus being restored. The Bus‑Off recovery is handled entirely by the hardware mechanism.

Thank you.

Alice

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Re: KEA128 CAN