S32KのトピックRe: S32K144 FlexCAN

S32K144 FlexCAN

Alex19 — Tue, 29 Nov 2022 18:28:35 GMT

Hello NXP,

I need your help, please. My problem is receiving several CAN messages PERIODICALLY without filtering. It means, for example, i have 10 CAN messages with different period 50ms, 100ms, 500ms. If I take, for example, CAN ID = 0x101 and I receive with filtering, i receive periodically, but if I receive without filtering, this CAN message is received non periodically.

Re: S32K144 FlexCAN

Senlent — Wed, 30 Nov 2022 03:08:08 GMT

Hi@Alex19

This can indeed happen if you don't set the mask for each MBs, which is not the correct way to set it.

In order to meet your design requirements, you can refer to this demo

https://community.nxp.com/t5/S32K-Knowledge-Base/S32K1xx-FlexCAN-Mask-Setting-Demo/ta-p/1519753

Chapter:4.2.Set the Mask Type to Individual Mask Type.

Re: S32K144 FlexCAN

Senlent — Wed, 30 Nov 2022 03:08:17 GMT

Hi@Alex19

This can indeed happen if you don't set the mask for each MBs, which is not the correct way to set it.

In order to meet your design requirements, you can refer to this demo

https://community.nxp.com/t5/S32K-Knowledge-Base/S32K1xx-FlexCAN-Mask-Setting-Demo/ta-p/1519753

Chapter:4.2.Set the Mask Type to Individual Mask Type.

Re: S32K144 FlexCAN

Alex19 — Wed, 30 Nov 2022 09:08:06 GMT

Thank you for your response,

I don't understand about

4.1.Set the Mask Type to Global Mask Type.

In this case, we can only receive the messages which ID from 0x300~0x37F and 0x400~0x47F.

but what if i want to receive for example 0x001~0x399 0x480~0x7FF. The idea is to identify the IDs and periods of the receiving CAN messages in a range 0x001~0x7FF.

Re: S32K144 FlexCAN

Senlent — Wed, 30 Nov 2022 09:17:11 GMT

If you want to receive all IDs, you can set the mask to all 0

Re: S32K144 FlexCAN

Alex19 — Wed, 30 Nov 2022 09:20:47 GMT

like this?

FLEXCAN_DRV_Init(INST_CANCOM1, &canCom1_State, &canCom1_InitConfig0);

FLEXCAN_DRV_SetRxMaskType(INST_CANCOM1, FLEXCAN_RX_MASK_GLOBAL);
FLEXCAN_DRV_SetRxMbGlobalMask(INST_CANCOM1, FLEXCAN_MSG_ID_STD, 0);

flexcan_data_info_t dataInfo =
{
.data_length = 8U,
.msg_id_type = FLEXCAN_MSG_ID_STD,
.enable_brs = false,
.fd_enable = false,
.fd_padding = 0U,
.is_remote = false
};

FLEXCAN_DRV_ConfigRxMb(INST_CANCOM1,RX_MAILBOX, &dataInfo, 0x7FF);

Re: S32K144 FlexCAN

Senlent — Thu, 01 Dec 2022 06:30:26 GMT

Yes, all ID messages can be received in this way, but frame loss will occur if the speed is too fast, and this is not the correct way to use it. The recommended approach is to set one MB for each ID and set the mask value to all 1s.

Re: S32K144 FlexCAN

Alex19 — Thu, 01 Dec 2022 08:41:58 GMT

The idea is receive several CAN messages, and identify IDs of messages. If i want receive 40 messages, but there are just 32 MB, so I can't set one MB for each ID, with my understanding.

Re: S32K144 FlexCAN

Alex19 — Mon, 05 Dec 2022 12:10:00 GMT

hello @Senlent ,

Can you clarify, please, about your last message

The recommended approach is to set one MB for each ID and set the mask value to all 1s.

Re: S32K144 FlexCAN

Senlent — Tue, 06 Dec 2022 01:09:29 GMT

for example:

FLEXCAN_DRV_SetRxMaskType(INST_CANCOM1,FLEXCAN_RX_MASK_INDIVIDUAL); FLEXCAN_DRV_ConfigRxMb(INST_CANCOM1, mb_idx_1, &dataInfo, msg_id_1); FLEXCAN_DRV_SetRxIndividualMask(INST_CANCOM1,FLEXCAN_MSG_ID_STD,mb_idx_1,0xFFFFFFFF); FLEXCAN_DRV_ConfigRxMb(INST_CANCOM1, mb_idx_1, &dataInfo, msg_id_2); FLEXCAN_DRV_SetRxIndividualMask(INST_CANCOM1,FLEXCAN_MSG_ID_STD,mb_idx_2,0xFFFFFFFF); ...............

S32K144 FlexCAN

Alex19 — Tue, 06 Dec 2022 09:54:26 GMT

Hello @Senlent

Thank you very much for your answer.

FLEXCAN_DRV_SetRxMaskType(INST_CANCOM1,FLEXCAN_RX_MASK_INDIVIDUAL);

FLEXCAN_DRV_ConfigRxMb(INST_CANCOM1, mb_idx_1, &dataInfo, msg_id_1);
FLEXCAN_DRV_SetRxIndividualMask(INST_CANCOM1,FLEXCAN_MSG_ID_STD,mb_idx_1,0xFFFFFFFF);

FLEXCAN_DRV_ConfigRxMb(INST_CANCOM1, mb_idx_1, &dataInfo, msg_id_2);
FLEXCAN_DRV_SetRxIndividualMask(INST_CANCOM1,FLEXCAN_MSG_ID_STD,mb_idx_2,0xFFFFFFFF);

this configuration is for receiving CAN messages with filtering, but I need receiving without filtering.

Re: S32K144 FlexCAN

Senlent — Tue, 06 Dec 2022 10:08:32 GMT

We've discussed filtering and not filtering, I don't know that your problem is not solved yet.
You can send me your demo, I will reproduce this problem first, and I will think about whether there is any way to improve it.

Re: S32K144 FlexCAN

Alex19 — Tue, 06 Dec 2022 10:24:09 GMT

@Senlent

I attached the poject

Re: S32K144 FlexCAN

Senlent — Wed, 07 Dec 2022 09:49:58 GMT

I read your code, there are many problems, I can not help you to modify directly. I suggest you refer to the routine of interrupt sending and receiving, you can set the mask to all 0 (if you don't want to set the mask)

Re: S32K144 FlexCAN

Alex19 — Thu, 08 Dec 2022 09:23:55 GMT

Hello @Senlent ,

What do you mean use interrupt sending and receiving, it's use RxFIFO?

Re: S32K144 FlexCAN

Senlent — Thu, 08 Dec 2022 09:52:07 GMT

You can use MB or FIFO to interrupt receiving and sending, I suggest you read the demo in my previous answer