S32K144 CAN Rx FiFo Interrupts

Kunal_Gettobyte — Sun, 16 Jun 2024 19:10:47 GMT

Hi their,

I am using CAN0 in S32K144 and using Rx FiFo mechanism in that via Interrupts.

My configurations are:

1) Format A Filter table and 8 Rx Filter elements

2) CAN0 at 500kbps, Rx Fifo enabled and via interrupts

And in the main() i have written this code:

// RX FIFO Filter table structure const Flexcan_Ip_IdTableType GB_FlexCAN_IdFilterTable[8] = { { .isRemoteFrame = FALSE, .isExtendedFrame = FALSE, .id = 0x320 }, { .isRemoteFrame = FALSE, .isExtendedFrame = FALSE, .id = 0x330 }, { .isRemoteFrame = FALSE, .isExtendedFrame = FALSE, .id = 0x340 }, { .isRemoteFrame = FALSE, .isExtendedFrame = FALSE, .id = 0x350 }, { .isRemoteFrame = FALSE, .isExtendedFrame = FALSE, .id = 0x360 }, { .isRemoteFrame = FALSE, .isExtendedFrame = FALSE, .id = 0x370 }, { .isRemoteFrame = FALSE, .isExtendedFrame = FALSE, .id = 0x380 }, { .isRemoteFrame = FALSE, .isExtendedFrame = FALSE, .id = 0x390 } }; int main(void) { Flexcan_Ip_StatusType FlexCAN_Api_Status; /* Write your code here */ Clock_Ip_Init(&Mcu_aClockConfigPB[0]); #if defined (FEATURE_CLOCK_IP_HAS_SPLL_CLK) while ( CLOCK_IP_PLL_LOCKED != Clock_Ip_GetPllStatus() ) { /* Busy wait until the System PLL is locked */ } Clock_Ip_DistributePll(); #endif IntCtrl_Ip_EnableIrq(CAN0_ORed_0_15_MB_IRQn); IntCtrl_Ip_InstallHandler(CAN0_ORed_0_15_MB_IRQn, CAN0_ORED_0_15_MB_IRQHandler, NULL_PTR); /* Initialize all pins using the Port driver */ Port_Init(NULL_PTR); /* Initilisize FlexCAN Module according to FlexCAN_Config0 data structure */ FlexCAN_Ip_Init(INST_FLEXCAN_0, &FlexCAN_State0, &FlexCAN_Config0); /* Configure the RxFIFO with corresponding ID filter table acceptance format and acceptance message ID's*/ FlexCAN_Api_Status = FlexCAN_Ip_ConfigRxFifo_Privileged(INST_FLEXCAN_0, FLEXCAN_RX_FIFO_ID_FORMAT_A, &GB_FlexCAN_IdFilterTable); /* Start the FlexCAN Module */ FlexCAN_Api_Status = FlexCAN_Ip_SetStartMode(INST_FLEXCAN_0); /* RxFiFo in non-blocking method*/ FlexCAN_Api_Status = FlexCAN_Ip_RxFifo(INST_FLEXCAN_0, &GB_FlexCAN_Receive_Data); for(;;) { /* RxFiFo in non-blocking method*/ FlexCAN_Api_Status = FlexCAN_Ip_RxFifo(INST_FLEXCAN_0, &GB_FlexCAN_Receive_Data); TestDelay(20000000); } return 0; } /* END main */ /*! ** @} */

Now my question and issue is that under the infinite for loop, i have written FlexCAN_Api_Status = FlexCAN_Ip_RxFifo(INST_FLEXCAN_0, &GB_FlexCAN_Receive_Data);. It works fine and my Interrupt is working fine.

But if i remove this API from for loop and put it above for loop and in for loop its just delay like this:

/* RxFiFo in non-blocking method*/ FlexCAN_Api_Status = FlexCAN_Ip_RxFifo(INST_FLEXCAN_0, &GB_FlexCAN_Receive_Data); for(;;) { TestDelay(20000000); }

Then my interrupt is not generated regularly. It only generates for first time and once it enters in for loop then if i send CAN data my Rx FiFo interrupt is not generated for the message ID that are configured in filter table.

So why is this happening? As if I am using interrupt it should trigger interrupt in infinite loop if any CAN received data comes in. Do we have to call FlexCAN_Ip_RxFifo() API everytime to receive data? If that is the case, isnt that wrong because if i have to call API to receive data everytime then its fundamental usecase would not happen.

Let me know if i am missing something and what should be workaround. My ask is simple that i want to receice CAN data via Rx FiFo in interrupt data if any new can data of configured message id comes, even if code is in infinite loop

Re: S32K144 CAN Rx FiFo Interrupts

Senlent — Mon, 17 Jun 2024 02:18:05 GMT

Hi@Kunal_Gettobyte

Please refer to this post and also you can find demo in this articles.

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

Re: S32K144 CAN Rx FiFo Interrupts

Kunal_Gettobyte — Mon, 17 Jun 2024 16:48:57 GMT

Hi,

Thanks, problem solved.

Thanks

topic S32K144 CAN Rx FiFo Interrupts in S32K

S32K144 CAN Rx FiFo Interrupts

Re: S32K144 CAN Rx FiFo Interrupts

Re: S32K144 CAN Rx FiFo Interrupts