The length of data sent by canfd is inconsistent

[vanaua]

I got the following project file according to the NXP official canfd example, but when I used FLEXCAN0_transmit_msg, there were many zeros in the end, could you please tell me whether I sent the 8-bit length? How does it display 64 bits at the receiving terminal?

[PetrS · Accepted solution]

Hi,

use CAN0->RAMn[ 0*MSG_BUF_SIZE + 0] = 0xCC400000 | 8 << CAN_WMBn_CS_DLC_SHIFT;

or simply write

CAN0->RAMn[ 0*MSG_BUF_SIZE + 0] = 0xCC480000;

BR, Petr

[vanaua]

Thank you very much,your answer solved my puzzle

[vanaua]

does any bro can help me? Thanks

[vanaua]

[vanaua]

CAN0->RAMn[ 0*MSG_BUF_SIZE + 0] = 0xCC4F0000 | 8 << CAN_WMBn_CS_DLC_SHIFT;

It  seems that   DLC =8  doesn't work at all, and received length remains 64 。