DRA7xx_EVM D_CAN Message Objects

Hello Ganesh,

I think that the definitions below are not the issue for your problem with DCAN module:

"But in the driver if you see c_can.c,
#define C_CAN_NO_OF_OBJECTS 32
#define C_CAN_MSG_OBJ_RX_NUM 16
#define C_CAN_MSG_OBJ_TX_NUM 16"

No of msg objects for C_CAN_TX and C_CAN_RX are 16 na?..So I should get error after 16 times na?
Also i think for CAN total 64 msg objects available then why in macro fixed to 32 ?

I suggest you to take a detail look on section 24.10.4.7 Configuration of Message Objects Description in TRM.

It would help you to configure DCAN module messages correctly.

Take a look on this function:

/*
 * Configure C_CAN message objects for Tx and Rx purposes:
 * C_CAN provides a total of 32 message objects that can be configured
 * either for Tx or Rx purposes. Here the first 16 message objects are used as
 * a reception FIFO. The end of reception FIFO is signified by the EoB bit
 * being SET. The remaining 16 message objects are kept aside for Tx purposes.
 * See user guide document for further details on configuring message
 * objects.
 */
static void c_can_configure_msg_objects(struct net_device *dev)

Best regards,

Yanko

Hii Yanko,

Hello Yanko,

If the error is not related to message objects, then what will be the reason for --
when i am trying to write continuously on the bus with no other device connected to the bus(or no device receiving )... I am getting " no buffer space available(perror)" error after 26 times..

Regards,
Ganesh

Hello Ganesh,

Please take a look on similar thread - e2e.ti.com/.../693485

Could you try to execute following commands:

a. Transmit 8 bytes with standard packet id number as 0x10

$ cansend can0 -i 0x10 0x11 0x22 0x33 0x44 0x55 0x66 0x77 0x88

b. Transmit 8 bytes with extended packet id number as 0x800

$ cansend can0 -i 0x800 0x11 0x22 0x33 0x44 0x55 0x66 0x77 0x88 -e

c. Transmit 20 packets of 8 bytes each with same extended packet id number as 0xFFFFF

$ cansend can0 -i 0xFFFFF 0x11 0x22 0x33 0x44 0x55 0x66 0x77 0x88 -e --loop=20

d. Transmit a sequence of numbers from 0x00-0xFF, till the buffer availability

$ cansequence can0

e. Transmit a sequence of numbers from 0x00-0xFF and roll-back in a continuous loop

$ cansequence can0 -p

Receive packets

Packet reception can be achieve by using candump utility

$ candump can0

Afterwards, send us a log with results.

Best regards,
Yanko

Hello Yanko,

In DRA7xx_EVM i have tried to use cansend,candump commands but may the utilities are missing and i am getting command not found....
I am sending data from CAN from userspace by opening a socket and transmitting it..

Regards,
Ganesh