topic SDK API GenerateMAC and GenerateMACAddrMode Quetion. in S32K

SDK API GenerateMAC and GenerateMACAddrMode Quetion.

814420552 — Sun, 27 Sep 2020 10:04:49 GMT

hello,

When call the API CSEC_DRV_GenerateMAC() and CSEC_DRV_GenerateMACAddrMode() calculates the same mesage, why is the result different? and We try to modify the alignment of the message,as shown in the figure below, looking forward to your reply, thank you.

CSEC_DRV_GenerateMACAddrMode():

CSEC_DRV_GenerateMAC()

Re: SDK API GenerateMAC and GenerateMACAddrMode Quetion.

lukaszadrapa — Tue, 29 Sep 2020 12:47:20 GMT

Hi,

there are two possible reasons for such behavior:

Make sure that both conditions are met.

Regards,

Lukas

Re: SDK API GenerateMAC and GenerateMACAddrMode Quetion.

FrankPan — Thu, 14 Apr 2022 02:25:30 GMT

Hello. I encounter the same problem. Still can not find the reason why.

the API "CSEC_DRV_GenerateMACAddrMode" seems do not work.

That's strange.

Re: SDK API GenerateMAC and GenerateMACAddrMode Quetion.

FrankPan — Fri, 15 Apr 2022 01:29:17 GMT

Now I know the reason.

Because the ARM core MCU consider a 32-bit number as little-endian.

For example:

0x12345678 is considered as [0x78, 0x56, 0x34, 0x12].

The two API does not consider the number as same persperctive.

So the resulting calcuted results are different, which is strange.

NXP should tell the programmer to consider this subtle things.