RX Fifo Format C set up

[sophie-wang]

Hello NXP Expert,

I want use flexcan fifo( id filter with format c ) receive can message，I set id filter in the following code:

uint32_t rxFifoFilter[] = {FLEXCAN_RX_FIFO_STD_FILTER_TYPE_C_HIGH(0x433) | \

                                   FLEXCAN_RX_FIFO_STD_FILTER_TYPE_C_MID_HIGH(0x512) | \

                                   FLEXCAN_RX_FIFO_STD_FILTER_TYPE_C_MID_LOW(0x654) | \

                                   FLEXCAN_RX_FIFO_STD_FILTER_TYPE_C_LOW(0x332)    \

};

flexcan_rx_fifo_config_t rxFifoConfig;

rxFifoConfig.idFilterTable = rxFifoFilter;

rxFifoConfig.idFilterType  = kFLEXCAN_RxFifoFilterTypeC;

rxFifoConfig.idFilterNum   = sizeof(rxFifoFilter) / sizeof(rxFifoFilter[0]);

rxFifoConfig.priority      = kFLEXCAN_RxFifoPrioHigh;

FLEXCAN_SetRxFifoConfig(FLEXCAN1, &rxFifoConfig, true);

I think the CAN message ID I received should be 0x430~0x437, 0x510~0x517, 0x650~0x657，0x330~0x337, but the CAN Message ID I received is out of this range(0x30~0x37, 0x1F8~0x1FF, 0x230~0x237, 0x330~0x337, 0x3F8~0x3FF, 0x430~0x437, 0x510~0x517, 0x5F8~0x5FF, 0x630~0x637, 0x650~0x657, 0x7F8~0x7FF),

Why did I receive an out-of-range ID?

Can you tell me how Fifo with ID Filter format C matches received ids?

What should I do if I want to use Fifo ID filters together with individmasks?

Thanks

Sophie

[Senlent]

Hi@sophie-wang

Can you try to set only one filter table then test it again, and attach the result.

it is inconvenient to calculate whether the mask setting is correct

I will send you a reference document by private message, you can take a look at the Chapter 3.2

BR!

      Jim,

[sophie-wang]

Hi Jim,

Thank you.

I have changed rxFifoFilter to the following code:

uint32_t rxFifoFilter[] = {FLEXCAN_RX_FIFO_STD_FILTER_TYPE_C_HIGH(0x433) | \

                                   FLEXCAN_RX_FIFO_STD_FILTER_TYPE_C_MID_HIGH(0x433) | \

                                   FLEXCAN_RX_FIFO_STD_FILTER_TYPE_C_MID_LOW(0x433) | \

                                   FLEXCAN_RX_FIFO_STD_FILTER_TYPE_C_LOW(0x433)};

All ID filters are set to 0x433, It has not set RX FIFO Global Mask and individmasks.Theoretically, I should have received ids in the range 0x430 to 0x437, but this was not the case, I received ids as follows:

0x30~0x37, 0x1F8~0x1FF, 0x230~0x237, 0x3F8~0x3FF, 0x430~0x437, 0x5F8~0x5FF, 0x630~0x637, 0x7F8~0x7FF

I can't find any regularity.

[Senlent · Accepted solution]

Hi@sophie-wang

  I can't see from your code whether you have set the mask, and I didn't find some functions in the standard library, such as FLEXCAN_SetRxFifoConfig().

I can provide you with an example code for your reference ,but this will take a while, I need some time to test it.

BR!

     Jim，