LPC2129 CAN receiving problem ( send message == OK ) OLIMEX

Development Boards MicroMod
1

Hi all.

I’m a new lpc developer, I’v bought an Olimex lpc2129 board (which has

embedded 2 x DB9 connectors for UART/COM ports and 2x CAN ports).

There are a PCA82C250 tranceivers for CAN protocol.

I’ve read couple topics here with similar problems but I havent found

an answere becouse people have

problems mostly with FullCan hardware acceptance filters but they

usually are able to get some messages with filter off.

I’m programming flash with H-JTAG (H-Flasher + macgraigor’s JTAG [sdk

  • eclipse]) with corrected checksum in LPC2000 for addres 0x00000014.

I’m using a 12MHz cristal, running on Cclk = Pclk = 60MHz (vpbdiv = 0x1),

All other peripherials like uart, gpio for 1-wire works perfectly,

but I have problem with receiving a CAN message.

I tried to run FullCan_SW, without any succes, this same was with

CANAll_v110 demo program.

I’ve checked CANbus activity with SYS-TEC gw-002 profesional CANbus

monitor and I know that I can

send correct message at any baud rate (but I use 125kb/s).

This simple example doesn’t receive anything at all either:

void CANIRQ(void) __attribute__ ((interrupt)); //declaration of VI
..
..
..
main()
{

CANALL_MSG MsgBuf; // CANALL buffor declaration

PINSEL1 |= 0x00040000; // set pin 0.25 as RDx
C1MOD = 0x00000001; // set CAN in reset mode
C1BTR = CANBitrate125k_12MHz; // setting baud rate
C1IER = 0x00000001; // CAN RX interrupt enable
VICVectCntl0 = 0x0000003a; // set priority
VICVectAddr0 = (unsigned)CANIRQ;

VICIntEnable = 0x04000000;
AFMR = 0x00000001; // Acceptance filter off
C1MOD = 0x00000000; // activity CAN

/* code from CANALL */
// CAN interface 2, use IRQVec1, at 125kbit
CANAll_Init(2,1,CANBitrate125k_12MHz);

// Set CAN Err ISR to IRQVec2
CANAll_SetErrIRQ(2);

// Initialize MsgBuf
MsgBuf.Frame = 0x00080000L; // 29-bit, no RTR, DLC is 8 bytes
MsgBuf.MsgID = 0x00000345L; // CAN ID
MsgBuf.DatA = 0xffffffffL; // all zeros
MsgBuf.DatB = 0xffffffffL; // all zeros
// Transmit initial message on CAN 2

CANAll_PushMessage(2,&MsgBuf);

while(1){
CANAll_PushMessage(2,&MsgBuf);
delayms(100);
};

}

void CANIRQ(void){
unsigned int cos;
cos = C1RDA;
IOCLR0 = LED1; //LED ON
delayms(500);
IOSET0 = LED1;// LED OFF
delayms(500);
C1CMR = 0x00000004; // free receiving buffer
VICVectAddr = 0x00000000; // acknowledge finish interrupt
};

I’m starting think that there is something wrong with hardware, for

example receivers are broken.

I’ve no idea, I’ll be very gratefull for any ideas/help.

I’ve checked the voltage in this configuration an it’s 3.3[V] on each

LPC CAN pin(9,10,3,5).

Cheers

2

When I connected (TD2 with RD1) and it didn’t work(I bypassed the 82C250 CAN BUS transceiver). When I make some short-circuiting (TD2 with

RD2) and (RD1 with TD1) it isn’t working either.