如何在读取后清空CAN FIFO

嗨，我目前正在做一个在两个PIC32 2048 EFH064（MPLABX 3.45，和谐1.062 02）之间的CAN通信。我用轮询模式下的CAN，传输和接收工作良好，但是管理收到的消息确实有问题。确实，在一些CAN帧到达之后，接收FIFO会充满它们。为了确保我不读两次消息，我希望FIFO在我打电话后被一条消息清空：但是这不会发生。因此，每次我读FIFO，都会得到相同的消息，因为我没有办法检查新消息是否已经替换了旧消息。那么，在读取了FIFO之后，我怎么才能清空FIFO呢？或者我怎样才能确保新消息取代了FIFO中的旧消息呢？非常感谢你对此事的任何建议。杰罗姆



      以下为原文

    Hi,

I am currently working on making a CAN communication between two pic32 2048EFH064 (MPLABX 3.45, HARMony 1.06.02). I use the CAN in polled mode.
The transmission and reception work fine, however I do have a problem managing the received messages.

Indeed, after some CAN frames have arrived, the receive FIFO gets filled with them. To make sure that I don't read a message twice, I was expecting the FIFO to be emptied by one message after I called  DRV_CAN0_ChannelMessageReceive :
for (k=0; k<=C1FIFOCON0bits.FSIZE; k++){
while (DRV_CAN0_ChannelMessageReceive(CAN_CHANNEL0, 0x33, 8, (uint8_t*)&RxMsg[k]) == false);
}

But this does not happen. As a consequence, every time I read the FIFO, I get the same messages, as I don't have a way to check that new messages have replaced the old ones.

So how can I empty the FIFO after having read it ?
Or How could I make sure that new messages have replaced the old ones in the FIFO?

Thanks a lot for any advice on that matter.
Jerome