S32DS for ARM 2.2 - Problem on callback of Rx FIFO

xu_wenming — Fri, 14 Aug 2020 03:16:23 GMT

Hello,

We use can_pal.c moudle to implement CAN bus function.

System starts reception via CAN_Receive and install a callback function via CAN_InstallEventCallback.

Static void internalCallback(
U32 interface, /**< CAN interface */
can_event_t eventType, /**< The type of the event */
U32 box, /**< Message box */
void *state) /**< Internal driver state information */

When a CAN frame is received, the callback function is called correctly.

However, when we get message: ((flexcan_state_t*)state)->mbs->mb_message, it's not correct.

After investigation, I found that in function:

static inline void FLEXCAN_IRQHandlerRxFIFO(uint8_t instance, uint32_t mb_idx)

mb_message is cleared before calling the callback function by:

FLEXCAN_CompleteRxMessageFifoData(instance);

From my perspective, callback function SHOULD be called before completing receive data.

Please check it out.

BRs,

Matthew Xu

topic S32DS for ARM 2.2 - Problem on callback of Rx FIFO in S32 SDK

S32DS for ARM 2.2 - Problem on callback of Rx FIFO