STM32F103RB CAN J1939 identifier

[Nicolas Cmb]

Posted on June 19, 2017 at 13:45

Hi evryone, I'm using STM32f103rb card to communicate with another STM32f103rb thanks to STM32F103Rb CAN protocole, and I'm looking for using J1939.

I have parameter my identifier like that :

hcan.pTxMsg->StdId = 0x01;

hcan.pTxMsg->ExtId = 0x01DAD4DC1;

hcan.pTxMsg->RTR = CAN_RTR_DATA;

hcan.pTxMsg->IDE = CAN_ID_EXT;

hcan.pTxMsg->DLC = 8;

and I'm trying to configurate my filter, but I've no idea of what could be the following configurations :

sFilterConfig.FilterIdHigh 

sFilterConfig.FilterIdLow

sFilterConfig.FilterMaskIdHigh

sFilterConfig.FilterMaskIdLow

sFilterConfig.BankNumber 

Anyone can help me ?

Thanks for your attention,

Regards,

Nicolas.

[Tesla DeLorean]

Posted on June 19, 2017 at 14:44

https://community.st.com/0D50X00009XkYJGSA3

You have to construct the mask and id so the comparator in the peripheral can recognize the specific bit pattern

The mask is ANDed with the bit stream and the ID is then compared.

https://community.st.com/0D50X00009XkXx6SAF

The EXID complicates the construction of the bit patterns, but look at the diagram of what the chip is looking for.

[Tesla DeLorean]

Posted on June 19, 2017 at 18:37

HCANFilter_Struct.FilterIdHigh = (EXTID >> 13) & 0xFFFF; // 29-bit EXTID

HCANFilter_Struct.FilterIdLow = ((EXTID << 3) & 0xFFF8) | 4;

HCANFilter_Struct.FilterMaskIdHigh = 0xFFFF; // MSB

HCANFilter_Struct.FilterMaskIdLow = 0xFFFC; //LSB

[Nicolas Cmb]

Posted on June 21, 2017 at 10:36

thank you so much, but I need to know how you have doing this