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Message
From: jmakias at sun3.oulu.fi<jmakias@s...>
Date: Tue Jul 5 09:52:55 CEST 2005
Subject: [oc] CAN protocol controller
I am using CAN protocol controller and it is connected via Avalon Bus to
the Nios II processor. The problem is that every time I try to give
Transmission Request CAN controller goes to the reset mode and
transmits nothing. What could be the reason for that?
The code I used is below:
////*Configuration and Initialization *////
/*Controller to reset-mode, register 0*/
IOWR_8DIRECT(CAN_CONTROLLER_BASE,0 ,0x21 );
usleep(1);
usleep(1);
/*Initialize clock divider, register 31*/
IOWR_8DIRECT(CAN_CONTROLLER_BASE,124 ,0x8 );
usleep(1);
/*Acceptance code, register 4*/
IOWR_8DIRECT(CAN_CONTROLLER_BASE,16 ,0xFF );
usleep(1);
/*Acceptance mask, register 5*/
IOWR_8DIRECT(CAN_CONTROLLER_BASE,20 ,0xFF );
usleep(1);
/*Bus timing 0, register 6 */
IOWR_8DIRECT(CAN_CONTROLLER_BASE,24 ,0x0 );
/*Bus timing 1, register 7 */
IOWR_8DIRECT(CAN_CONTROLLER_BASE,28 ,0x53 ); //0x27
usleep(1);
/*Operation mode, register 0*/
IOWR_8DIRECT(CAN_CONTROLLER_BASE,0,0x20);
usleep(2000000);
////*End of initialization *////
///*The code for packet transmission*///
/*identifier 1, register 10*/
IOWR_8DIRECT(CAN_CONTROLLER_BASE,40,0xFF);
/*identifier 2 (DLC=8), register 11*/
IOWR_8DIRECT(CAN_CONTROLLER_BASE,44,0x28);
/* data to databuffer 1, register 12*/
IOWR_8DIRECT(CAN_CONTROLLER_BASE,48,0x58);
/*transmission request, register 1*/
IOWR_8DIRECT(CAN_CONTROLLER_BASE,4,0x01);
usleep(1000000);
///*End of the code for packet transmission*///
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