MPC5746C SDK Flexcan Driver

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MPC5746C SDK Flexcan Driver

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magazine_earaz
Contributor I

Hello Everyone,

I have a problem with MPC5746C SDK Flexcan Driver. I try to transmit and receive data with sample code (flexcan_mpc5746c). I can receive succesfully but I can not transmit data from CAN0. 

Message buffer is contuniuesly in FLEXCAN_TX_BUSY state. How can I fix this issue ? There is an sample code attached for simple flexcan tx/rx trial.

status_t FLEXCAN_DRV_GetTransferStatus(uint8_t instance, uint8_t mb_idx)
{
DEV_ASSERT(instance < CAN_INSTANCE_COUNT);

const flexcan_state_t * state = g_flexcanStatePtr[instance];
status_t status;

if (state->mbs[mb_idx].state == FLEXCAN_MB_IDLE)
{
status = STATUS_SUCCESS;
}
else
{
status = STATUS_BUSY;
}

return status;
}

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alexandrunan
NXP Employee
NXP Employee

I have looked over your project and are some inconsistency between driver configuration and the transmit configured MB. The driver is configured from non FD operation and you try to send a data as FD frame this is why you can receive but not transmit.

If you want classic frame nonFD you should use at config tx MB and send next configuration:

  flexcan_data_info_t dataInfo =
{
.data_length = 1U,
.msg_id_type = FLEXCAN_MSG_ID_STD,
.enable_brs = false,
.fd_enable = false,
.fd_padding = 0U
}; 

BR,

Alexandru Nan