topic Re: SetRxFifoGlobalMask behavior in i.MX RT Crossover MCUs

SetRxFifoGlobalMask behavior

andydong1 — Tue, 07 Apr 2020 09:26:14 GMT

Hi,

I used imxrt1050 and SDK is 2.6.1

below is my settings

uint32_t rxFifoFilter[] = {FLEXCAN_RX_FIFO_STD_FILTER_TYPE_A(0x3c0, 0, 0)};

rxFifoConfig.idFilterNum = sizeof(rxFifoFilter) / sizeof(rxFifoFilter[0]);
rxFifoConfig.idFilterTable = rxFifoFilter;
rxFifoConfig.idFilterType = kFLEXCAN_RxFifoFilterTypeA;
rxFifoConfig.priority = kFLEXCAN_RxFifoPrioHigh;
FLEXCAN_SetRxFifoConfig(EXAMPLE_CAN, &rxFifoConfig, true);

FLEXCAN_SetRxFifoGlobalMask(EXAMPLE_CAN,FLEXCAN_RX_FIFO_STD_MASK_TYPE_A(0x198,0,0));


txFrame.format = kFLEXCAN_FrameFormatStandard;
txFrame.type   = kFLEXCAN_FrameTypeData;
txFrame.id     = FLEXCAN_ID_STD(0x7ff);
txFrame.length = DLC;‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

txFrame2.format = kFLEXCAN_FrameFormatStandard;
txFrame2.type   = kFLEXCAN_FrameTypeData;
txFrame2.id     = FLEXCAN_ID_STD(0x7c0);
txFrame2.length = DLC;

In this condition, why I still receive the txFrame ?

the txFrame ID didn't match.

Filter = 0x 1 1110 0000 00000000000000000000
Mask = 0x 1100 1100 00000000000000000000

txFrame = 0x 11 1111 1111 1000000000000000000-
txFrame2 = 0x 11 1110 0000 0000000000000000000-

and what's the difference between RxFifoGlobalMask and RxIndividualMask ?

thanks

Best Regareds,

Andy Dong

Re: SetRxFifoGlobalMask behavior

kerryzhou — Wed, 08 Apr 2020 08:21:17 GMT

Hello Andy Dong ,

What's the SDK project you are using? Could you please tell me the path？

This one?

SDK_2.7.0_EVKB-IMXRT1050\boards\evkbimxrt1050\driver_examples\flexcan\interrupt_transfer

Please also update your SDK to the newest version.

It seems your code not the directly SDK original code, do you modify the code, please also tell me which file, then I can help you to check more details.

RXMGMASK is used to mask the filter fields of all Rx MBs, excluding MBs 14-15, which have individual mask registers.

RXIMR are used as acceptance masks for ID filtering in Rx MBs and the Rx FIFO

Wish it helps you!

Kerry

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Re: SetRxFifoGlobalMask behavior

andydong1 — Thu, 09 Apr 2020 01:36:06 GMT

Hi, Kerry Zhou

I used SDK_2.5.0_MIMXRT1052xxxxB\boards\evkbimxrt1050\driver_examples\flexcan\loopback_transfer

I modified this example to test the Rx FIFO.

I used MB 13&14 to transmit the txFrame&txFrame2.

the result of above settings is not what I imagine.

the txFrame and txFrame2 masked by RxFifoGlobalMask should be below

txFrame = 0x xx 11xx 11xx xxxxxxxxxxxxxxxxxxx-
txFrame2 = 0x xx 11xx 00xx xxxxxxxxxxxxxxxxxxx-

so txFrame will not be received.

Best Regards,

Andy Dong