topic Re: MPC5748C Re-initializes Flexcan in MPC5xxx

MPC5748C Re-initializes Flexcan

xiha — Thu, 02 Nov 2023 06:26:56 GMT

My projects are based on Flexcan and ETHERNET.Now I'm going to re-initialize Flexcan after receiving the command over the network,but I can't restart FlexCan successfully.The driver isn't normal.CANFD communication is error.The log of CANFD sender, printf ErrorFrame.The code is as follows:

flexcan_user_config_t my_canCom1_InitConfig0 = { .fd_enable = true, .pe_clock = FLEXCAN_CLK_SOURCE_OSC, .max_num_mb = 16, .num_id_filters = FLEXCAN_RX_FIFO_ID_FILTERS_8, .is_rx_fifo_needed = false, .flexcanMode = FLEXCAN_NORMAL_MODE, .payload = FLEXCAN_PAYLOAD_SIZE_64, .bitrate = { .propSeg = 7, .phaseSeg1 = 5, .phaseSeg2 = 4, .preDivider = 1, .rJumpwidth = 1 }, .bitrate_cbt = { .propSeg = 11, .phaseSeg1 = 3, .phaseSeg2 = 3, .preDivider = 0, .rJumpwidth = 1 }, .transfer_type = FLEXCAN_RXFIFO_USING_INTERRUPTS, .rxFifoDMAChannel = 0U }; flexcan_data_info_t dataInfo = { .data_length = 64U, .msg_id_type = FLEXCAN_MSG_ID_STD, // .msg_id_type = FLEXCAN_MSG_ID_EXT, .enable_brs = true, .fd_enable = true, .fd_padding = 0U }; FLEXCAN_DRV_Deinit(INST_CANCOM1); FLEXCAN_DRV_Init(INST_CANCOM1, &canCom1_State, &canCom1_InitConfig0); FLEXCAN_DRV_InstallEventCallback(INST_CANCOM1,my_callback_event,NULL); /* Configure RX message buffer with index RX_MSG_ID and RX_MAILBOX */ FLEXCAN_DRV_ConfigRxMb(INST_CANCOM1, RX_MAILBOX, &dataInfo, 0u); FLEXCAN_DRV_SetRxMbGlobalMask(INST_CANCOM1,FLEXCAN_MSG_ID_STD,0);

If anyone can help to solve this problem?Thanks you very much!

Re: MPC5748C Re-initializes Flexcan

PetrS — Fri, 03 Nov 2023 07:59:07 GMT

Hi,

why is the deinit/init needed in fact? What kind of error is detected on sender side?
You can inspect FlexCAN module registers to know if Normal mode is entered and no errors are detected during message reception. Not sure if module also transmit anything.

BR, Petr

Re: MPC5748C Re-initializes Flexcan

xiha — Fri, 03 Nov 2023 08:23:51 GMT

Because I wanted to send commands to the MCU over the network and then change the baud rate of its CANFD communication, I used DeInit and Init to change the CANFD baud rate.

Thanks for your advice. I'll try.

Re: MPC5748C Re-initializes Flexcan

PetrS — Fri, 03 Nov 2023 10:24:37 GMT

Hi,

you can use FLEXCAN_DRV_SetBitrate and FLEXCAN_DRV_SetBitrateCbt for that, but changing bitrate requires all nodes on bus follow that too, otherwise you get error for further communications.

BR, Petr

Re: MPC5748C Re-initializes Flexcan

xiha — Fri, 03 Nov 2023 11:22:06 GMT

Your advice is very useful, thank you！！！ \ ^_^ / \ ^_^ / \ ^_^ /