CCS/TMS570LS0432: CAN driver communication

Did you change the message ID after each transfer? Please try EOB=0. 

Hello,

If I use the same ID for all messages it could affect? Because I'm sending a message with 223 bytes so I need use the same ID for each single (8 byte) message. I tested the transmission with EoB 0 but I had the same result, the slow transmission. Is not there a way to write multiple message objects into a message box before transmit? like a queue?. Thanks

Hi Adrian,

Yes, you can use the same ID or can change the ID whenever you want to. 

1. Did you probe the message waveform on CAN bus? Is the measured the rate 250kbps?

2. How long is the delay between two transfers (8-bytes per transfer)?

The maximum payload size in CAN message object is 8 bytes. You can use DMA to transfer data from SRAM to CAN message RAM (mailbox).

Hi,

1. Yes, the rate of 250 kbps is working fine, I tested it with a single transmission.

2. The delay between 2 transmissions is 548 us approx.

But the problem is that I have a 1 ms frame overrun interrupt, so at 250 kps I can send only 3 single messages (8 bytes), but I need to send 29.

There is no problem with CAN transmission. One message with 8-bytes payload takes around 110*4us (250kbps baudrate) = 440us, so 1ms is not enough to transmit the 29 messages. 

Yes you're right, but I'm looking the way to handle that 29 message tranmission by hardware to avoid that limitation of 1ms by the software, this using only 1 message box for all 29 message objects. It's possible?