Собственно сам код

#include "LPC23xx.h" /* LPC23xx definitions */
#include <stdlib.h>
#include "type.h"
#include "irq.h"


#define PLL_MValue 11
#define PLL_NValue 0



typedef struct
{
DWORD Frame; // Bits 16..19: DLC - Data Length Counter
// Bit 30: Set if this is a RTR message
// Bit 31: Set if this is a 29-bit ID message
DWORD MsgID; // CAN Message ID (11-bit or 29-bit)
DWORD DataA; // CAN Message Data Bytes 0-3
DWORD DataB; // CAN Message Data Bytes 4-7
} CAN_MSG;

CAN_MSG MsgBuf_RX1;

unsigned long ReceiveDate1;
unsigned long ReceiveDate2;

void ConfigurePLL ( void )
{
unsigned long MValue, NValue;

if ( PLLSTAT & (1 << 25) )
{
PLLCON = 1; /* Enable PLL, disconnected */
PLLFEED = 0xaa;
PLLFEED = 0x55;
}

PLLCON = 0; /* Disable PLL, disconnected */
PLLFEED = 0xaa;
PLLFEED = 0x55;

SCS |= 0x20; /* Enable main OSC */
while( !(SCS & 0x40) ); /* Wait until main OSC is usable */

CLKSRCSEL = 0x1; /* select main OSC, 12MHz, as the PLL clock source */

PLLCFG = PLL_MValue | (PLL_NValue << 16);
PLLFEED = 0xaa;
PLLFEED = 0x55;

PLLCON = 1; /* Enable PLL, disconnected */
PLLFEED = 0xaa;
PLLFEED = 0x55;

CCLKCFG = 3; /* Set clock divider */

while ( ((PLLSTAT & (1 << 26)) == 0) ); /* Check lock bit status */

MValue = PLLSTAT & 0x00007FFF;
NValue = (PLLSTAT & 0x00FF0000) >> 16;
while ((MValue != PLL_MValue) && ( NValue != PLL_NValue) );

PLLCON = 3; /* enable and connect */
PLLFEED = 0xaa;
PLLFEED = 0x55;
while ( ((PLLSTAT & (1 << 25)) == 0) ); /* Check connect bit status */
return;
}


void CANRec(void) __irq
{
DWORD * pDest;

// initialize destination pointer
pDest = (DWORD *)&MsgBuf_RX1;
*pDest = CAN1RFS; // Frame

pDest++;
*pDest = CAN1RID; // ID //change by gongjun

pDest++;
*pDest = CAN1RDA; // Data A

pDest++;
*pDest = CAN1RDB; // Data B

CAN1CMR = 0x04; // release receive buffer
VICVectAddr = 0;

return;
}

void InitCAN()
{
CAN1MOD = 1; // Reset CAN
PINSEL0 &= ~(0xF<<0);
PINSEL0 |= (0x5<<0); // enable PIN for CAN1
PCONP |= (1 << 13);
CAN1IER = 0; // Disable Receive Interrupt
//CAN1BTR = 0x0036002F;
// PCLKSEL0 = (1<<26);
CAN1BTR = 0x0015000C;
CAN_AFMR = 2;
CAN1IER = 0x00000001;

VICVectPriority0 = 0x00000001;
VICVectAddr0 = (unsigned)CANRec;
VICIntEnable = (1<<23);
CAN1MOD = 0;
}

void SendCAN(unsigned long Date)
{

while (CAN1SR&0x00000004)
{
CAN1TFI1 = 0x00040000;
CAN1TID1 = 0x00000001;
CAN1TDA1 = Date;
CAN1CMR = 1;
}
}



int main()
{
//ConfigurePLL();
InitCAN();
while (1)
{
if (MsgBuf_RX1.DataA == 0) SendCAN(0x55555555);
else SendCAN(MsgBuf_RX1.DataA);

for (long i=0; i<0x999999;i++);

}


}