Flexcan receiver file RT1021

[CCandido]

Hi,

my test with   RT1020-EVK

receiver file via CAN 500kbps.

Problems:

file 256k.....receiver 10k, 36, max 46k, and values the bytes in frame.

The interval between frames is 24,000 uS, and I use interrupt to save frames, then I can't time to reset the receiver and end up losing frames.

see:

code part:

static void flexcan_callback(CAN_Type *base, flexcan_handle_t *handle, status_t status, uint32_t result, void *userData)
{

switch (status)
{
case kStatus_FLEXCAN_RxIdle:
if (RX_MESSAGE_BUFFER_NUM == result)
{
can_temp.id = rxframe.id;
can_temp.length = rxframe.length;
can_temp.dataWord0 = rxframe.dataWord0;
can_temp.dataWord1 = rxframe.dataWord1;

rxframe.id = FLEXCAN_ID_STD(rxIdentifier);
rxXfer.mbIdx = RX_MESSAGE_BUFFER_NUM;
rxXfer.frame = &rxframe;
FLEXCAN_TransferReceiveNonBlocking(EXAMPLE_CAN, &flexcanHandle, &rxXfer);

rxComplete = true;

} else if (RX_MESSAGE_BUFFER_11 == result).....blablabla

-------------- save frames

CAN_BUF[bfifo_indx][i++] = can_temp.dataByte0;
CAN_BUF[bfifo_indx][i++] = can_temp.dataByte1;
CAN_BUF[bfifo_indx][i++] = can_temp.dataByte2;

-------------------------------------------

interrupt long time.

How to solved it.

Fifo + DMA  how to ?

or other solution.

thanks,

Carlos.

[CCandido]

Hi,

problemas "interval" solved with CAN polling,

receiver file lenth ok.

now other problems.

bytes diferent in frames.

example:

FRAME: 01 E8 08 DC B2 AA AA AA AA AA AA

FRAME: 01 E8 08 DC B2 AE AA AE AA AE AA   <----error

sdk

/* To get most precise baud rate under some circumstances, users need to set
quantum which is composed of PSEG1/PSEG2/PROPSEG. Because CAN clock prescaler
= source clock/(baud rate * quantum), for e.g. 84M clock and 1M baud rate, the
quantum should be .e.g 14=(6+3+1)+4, so prescaler is 6. By default, quantum
is set to 10=(3+2+1)+4, because for most platforms e.g. 120M source clock/(1M
baud rate * 10) is an integer. Remember users must ensure the calculated
prescaler an integer thus to get precise baud rate. */

calc quantum, 500000U and 1000000U is equal ?

FLEXCAN_GetDefaultConfig(&flexcanConfig);
flexcanConfig.baudRate = 500000U;  
flexcanConfig.timingConfig.phaseSeg1 = 3;
flexcanConfig.timingConfig.phaseSeg2 = 2;
flexcanConfig.timingConfig.propSeg = 1;

problems is calc quantum ?

thanks,

Carlos

[Hui_Ma]

Hi Carlos,

First of all, sorry for the later reply.

So you did the FlexCAN tests based on MIMXRT1020-EVK board?

Have a great day,
Mike

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[CCandido · Accepted solution]

hi Ma,

Solved problems!

FRAME: 01 E8 08 DC B2 AE AA AE AA AE AA   <----error = memory sram onboard

not problems with CAN 500k, problems is memory problems save data.

saved data in Ram internal, no more problems.

thanks,

Carlos.

[Hui_Ma]

Hi Carlos,

Glad to hear the issue was fixed.

Thanks for the sharing.

best regards,

Mike