AM2634: CAN Bus Bit Rate Timing Configuration

Wenkai

Part Number: AM2634

I couldn't find the instructions about how to configure CAN bus bit rate timing through the registers from the document "AM263x Technical Reference Manual". The version of the document I have is SPRUJ17 and dated as March 2022. Neither I could find any detail descriptions about any registers. The mcan example code only gives the default bit timing, which is 1Mbps and 5Mbps as nominal and data bit-rate respectively. So which instructions I should follow to change the bit rate timing?

This is the default setting from the example code:

/* MCASP Default Bit timing Parameters */
MCAN_BitTimingParams gMcanBitTimingDefaultParams =
{
.nomRatePrescalar = 0x7U,
.nomTimeSeg1 = 0x5U,
.nomTimeSeg2 = 0x2U,
.nomSynchJumpWidth = 0x0U,
.dataRatePrescalar = 0x1U,
.dataTimeSeg1 = 0x3U,
.dataTimeSeg2 = 0x2U,
.dataSynchJumpWidth = 0x0U,
};

Thanks,

Wenkai

over 3 years ago

0 Aakash Kedia over 3 years ago

TI__Mastermind 26145 points

Hi Wenkai,

In the same document, after the Table 13-266: DLC Coding you will find the details about CANFD Bit Timings explaining the 5Mbps.
Let us know if you are finding any issues with the same ?

Thanks and Regards,
Aakash

0 Wenkai over 3 years ago in reply to Aakash Kedia

Prodigy 180 points

Hi Aakash,

I noticed that part you mentioned but unfortunately that piece of information is not enough for an engineer to know how to configure bit timing. I looked into an old ARM MCU technical reference manual and was able to find the useful information. Apparently the current AM263x Technical Reference Manual is not a complete version because lots of information are missing, especially those related to the registers. And a lot of "TBD"s can be found through the entire document. I hope TI can publish the completed version asap so that it could be used as a real "technical reference".

Wenkai