TMS320F28388D: MCAN message RAM & Delay compensation parameters

Yale Li 李耀先

Hi Team,

1. When configuring classic CAN, we can use different mailbox configurations. For example, mailbox 1 is configured with a set of configurations, and mailbox 2 is configured with a set of configurations. There is no need to specifically configure a piece of RAM.

In CANFD, why is it necessary to configure a ram area to store these configurations? For example:

//
// Initialize Message RAM Sections Configuration Parameters
//
msgRAMConfigParams.flssa = MCAN_STD_ID_FILT_START_ADDR;
// Standard ID Filter List Start Address.
msgRAMConfigParams.lss = MCAN_STD_ID_FILTER_NUM;
// List Size: Standard ID.
msgRAMConfigParams.rxBufStartAddr = MCAN_RX_BUFF_START_ADDR;
// Rx Buffer Start Address.
msgRAMConfigParams.rxBufElemSize = MCAN_RX_BUFF_ELEM_SIZE;

2. How to calculate the sending delay compensation parameters?

Thanks & Regards

over 2 years ago

0 Sahil Deshpande over 2 years ago

TI__Expert 6035 points

Yale,

1. Please refer to the following app note: www.ti.com/lit/SPRAD59, for a detailed explanation on Message RAM Configuration.

2. Will get back to you on this point.

Thanks.

0 Hareesh Janakiraman over 2 years ago

TI__Guru* 95315 points

Yale Li 李耀先 said:
In CANFD, why is it necessary to configure a ram area to store these configurations?

While DCAN and MCAN both support the CAN protocol, MCAN is a completely different module. It follows a very different approach to message handling and storage. Both modules have different registers/bits and hence are not software compatible at all. It is to ease the transition from DCAN to MCAN that Sahil published the Application Note SPRAD59.

Yale Li 李耀先 said:
2. How to calculate the sending delay compensation parameters?

Please take a look at the TDC topic in https://dev.ti.com/tirex/explore/node?node=A__Ad7Ri414J3hIaR1AcY-VCw__C2000-ACADEMY__3H1LnqB__LATEST

0 Yale Li 李耀先 over 2 years ago in reply to Hareesh Janakiraman

TI__Expert 4660 points

Hareesh,

My customer watched the TDC topic in the link, but still haven’t seen the specific calculation method.
Can the default parameters of the routine be used for sending delay compensation parameters?

Thanks & Regards

+1 Hareesh Janakiraman over 2 years ago in reply to Yale Li 李耀先

TI__Guru* 95315 points

Delay counter automatically measures and compensates for the transceiver delay. The TDCO offset is used to fine tune the SSP point inside the bit time after the compensation by the delay counter. Please refer to below post:

https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000-microcontrollers---internal/f/c2000-microcontrollers---internal-forum/1191972/tms320f280039-what-is-the-means-of-mcan_psr-tdcv/4493389#4493389

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TMS320F28388D: MCAN message RAM & Delay compensation parameters