S12 / MagniV MicrocontrollersのトピックRe: Issue about S12MSCANV3: Error frame when received message DLC is 15

Issue about S12MSCANV3: Error frame when received message DLC is 15

leidenwei — Thu, 26 Apr 2018 01:24:01 GMT

hi All

we met one issue about this controller issue in the MC9S12XS256.

when the received message DLC is 15,why this controller can not work? It will send out the TxErr and NAK error frame. and will stop sending our App message.

but if change the receieved message DLC to 14, it can work again.

we can confirm that there is no issue in our CAN driver code.

Hoping your good answers!

Best wishes

Leiden Wei

Re: Issue about S12MSCANV3: Error frame when received message DLC is 15

lama — Mon, 30 Apr 2018 09:44:20 GMT

Hi,

Max data length of a one message frame is DLR=8. Look at Table 11-35. Data Length Codes in the Reference manual.

Best regards,

Ladislav

Re: Issue about S12MSCANV3: Error frame when received message DLC is 15

leidenwei — Thu, 03 May 2018 00:50:14 GMT

Thansk Lama！

Generally，our messege length is 8, but if we received message DLC field is 15(1111b), S12MSCANV3 will stop wroking.

In the IS0-11898-1-2003,please see the following picture, if DLC field is 15(1111b), should be considered as 8.

But in our datasheet , there is no this definition when DLC is more than 8.

Best wishes

Leiden Wei