AM3352: the interval time between two frame of can is uncontrolled

Hello Yunxue Wang,

Thank you for the query.

I will check internally and get back to you

Regards

Rajashri

Hi

Now have Any suggest for this issue?

Thanks

Yunxue Wang

Hello Yunxue Wang,

I am checking with the CAN expert  internally if the time variation(100ms, up to 600ms) between two frames is expected.

I am also checking if there is a way to improve the delay between frames.

I will update you based on the inputs received

Regards

Rajashri

Hello Rajashri

Any suggest  have now?

Our products are close to the shipping node, but now the can communication delay is large,

resulting in a great risk to the shipping schedule. If you can help solve this problem,

it will be of great help to our company. 

Yunxue Wang

Hello Yunxue Wang,

Please check with the current version of SDK (08.02.00.24). 

SDK path - PROCESSOR-SDK-AM335X Software development kit (SDK) | TI.com

Regards

Rajashri

Hello Rajashri

It is recommended to use this version of SDK or which part of the SDK is more efficient to investigate?

Thanks

Yunxue Wang

Hello Yunxue Wang,

I have already shared your inputs with our CAN team to check on this.

Regards

Rajashri 

Hi,

Could you please post the results of these commands?

ifconfig -a 

ip -d -s link show can0 ( I have assumed for the moment that the interface is can0)

cat /proc/net/can/stats

Could you please describe the application SW that you are using to send the CAN frames with? What is the target device and the SW that is running on it?

Best Regards,

Schuyler

HI

■the result of  [ifconfig -a] is as following:

■the result of  [ip -d -s link show can0] is as following:

■the result of [cat /proc/net/can/stats] is as following:

■send the CAN frames 

I use socketCAN send can frames, some options is as following:

struct sockaddr_can addr;
struct ifreq ifr;
struct can_frame frame[2] = {{0}};
s = socket(PF_CAN, SOCK_RAW, CAN_RAW);
strcpy(ifr.ifr_name, "can0" );
ioctl(s, SIOCGIFINDEX, &ifr); 
addr.can_family = AF_CAN;
addr.can_ifindex = ifr.ifr_ifindex;
bind(s, (struct sockaddr *)&addr, sizeof(addr));
setsockopt(s, SOL_CAN_RAW, CAN_RAW_FILTER, NULL, 0);

and transmit the data by write function in while(1)  as following:

nbytes = write(s, &frame[0], sizeof(frame[0]));

★Please refer to the attachment for the source code of can send frame

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <net/if.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <linux/can.h>
#include <linux/can/raw.h>

void boot_can_config()
{
    system("ip link set can0 down");  
    system("ip link set can0 type can bitrate 500000");
    system("ip link set can0 up");                                                                              
}

void can_load_config(void)
{
    boot_can_config();
}

int System_Check(int result)
{
    if((-1 != result) && (WIFEXITED(result)) && (!(WEXITSTATUS(result))))
        return 0;
    else
        return -1;
}

int can_send()
{
	int s, nbytes;
	struct sockaddr_can addr;
	struct ifreq ifr;
	struct can_frame frame[2] = {{0}};
	s = socket(PF_CAN, SOCK_RAW, CAN_RAW);//create socket
	strcpy(ifr.ifr_name, "can0" );
	ioctl(s, SIOCGIFINDEX, &ifr); // can0
	addr.can_family = AF_CAN;
	addr.can_ifindex = ifr.ifr_ifindex;
	bind(s, (struct sockaddr *)&addr, sizeof(addr));//bind can0

	setsockopt(s, SOL_CAN_RAW, CAN_RAW_FILTER, NULL, 0);

	frame[0].can_id = 0x19B;
	frame[0].can_dlc = 8;

	frame[0].data[0] = 'B';
	frame[0].data[1] = 'I';
	frame[0].data[2] = 'O';
	frame[0].data[3] = 'K';
	frame[0].data[4] = '!';
	frame[0].data[5] = '!';
	frame[0].data[6] = '!';
	frame[0].data[7] = '!';
	
	while(1)
	{
		//send can frame
		nbytes = write(s, &frame[0], sizeof(frame[0])); //send frame[0]
		if(nbytes != sizeof(frame[0]))
		{
			printf("Send Error frame[0]\n!");
		}
		usleep(2000);		//2ms
	}
	close(s);
	return 0;
}

int main()
{
	can_load_config();

	can_send();

	return 0;
}

Now I send can frames by the function of can_send_demo.c on AM3352, and PC side gets the can frames by PCan(a device of equipment which connect to the can bus and analysis the data)，it's a so sample function, but some interval between two frames are more than 100ms.

Thanks

Yunxue Wang

Hi Schuyler

Now have Any suggest for this issue?

Thanks

Yunxue Wang