Can't make CAN to recieve messages : AT91SAM7X

GSNT · **Posted:** Sat Jul 07, 2007 6:13 pm

BTW:

just try to transmit a message(without ints) and scope your hardware:

Code:

//set transmit mailbox
//mailbox 1 transmission low byte first
 AT91C_BASE_CAN->CAN_MB1.CAN_MB_MID=0x55C<<18;    //11 bit Part A ID
 AT91C_BASE_CAN->CAN_MB1.CAN_MB_MAM=0x00000000;   //accept all   
 AT91C_BASE_CAN->CAN_MB1.CAN_MB_MDH=0x87654321;   //data high
 AT91C_BASE_CAN->CAN_MB1.CAN_MB_MDL=0x03345602;   //data low
 AT91C_BASE_CAN->CAN_MB1.CAN_MB_MMR=0x03<<24;     //transmit
 

//enable CAN without ABM
AT91C_BASE_CAN->CAN_MR = AT91C_CAN_CANEN; 


//transmit it
AT91C_BASE_CAN->CAN_MB1.CAN_MB_MCR =(8<<16)|AT91C_CAN_MTCR;   

HTH,
GSNT

hzn · **Joined:** Tue Oct 10, 2006 9:04 am **Posts:** 9

FINALLY!!!!

I made it to work.. and Gerd, you were right, the CAN Tranciever was damaged. I replaced it with new one, and everything worked without a code change!.

MANY THANKS MAN!
I owe you.

I think this will be good topic for anyone to refer when working on CAN.\

hzn · **Joined:** Tue Oct 10, 2006 9:04 am **Posts:** 9

And also for ALL:

Code:

#define CAN_BR_500K      0x00053255
#define CAN_BR_250K      0x000B3255
#define CAN_BR_200K      0x000E3255
#define CAN_BR_150K      0x00133255
#define CAN_BR_125K      0x00173255
#define CAN_BR_100K      0x001D3255
#define CAN_BR_83K      0x00233255
#define CAN_BR_75K      0x00273255
#define CAN_BR_50K      0x003B3255
#define CAN_BR_25K      0x00773255

Baudrates for AT91SAM7X MCK=48Mhz.

ps. if you think you don't have signal propagation time,
then last 255 can be modified to 066.

GSNT · **Posted:** Tue Jul 10, 2007 7:05 pm

Glad to hear!
And now you're one of the most experienced CAN hard- and software guys.
Congratulations!

Regards,
GSNT

kosh · **Joined:** Tue May 04, 2010 11:29 am **Posts:** 6

problem solved --

Can't make CAN to recieve messages : AT91SAM7X

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