Hello, the problem was in incorrect MEMMAP setting. In LPC2106 chip other interrupt service programs worked well, because it had ldr pc,[pc,#-0xff0] programmed in the flash by our vendor. Now, with addition of MEMMAP=0x2, posted CAN ISR code works well. Best regards, Marek P. --- In lpc2000@lpc2..., Marek Peca <marek@d...> wrote: > Dear colleagues, > > playing half a day with LPC2119 CAN controller, I really halted at > problem, that interrupt service routine for CAN message reception > does not work. > > I have a board with LPC2119 (TPN0431AY), crystal, CPU and peripheral > frequency equal to 10MHz. It communicates well via CAN with laptop > CAN analyser software (both reception and transmission), using > 50kb/s. Programmed to RAM using bootloader software (other programs > works well, even with interrupts). Compiled on Linux using gcc, > header file lpc21xx.h and crt0.s downloaded somewhere. > > * When I use polling for incoming message (C1GSR&0x1), everything > works well. When I setup CAN receive interrupt handler, it does not > work -- the handler is never called after message reception.

Dear colleagues, playing half a day with LPC2119 CAN controller, I really halted at problem, that interrupt service routine for CAN message reception does not work. I have a board with LPC2119 (TPN0431AY), crystal, CPU and peripheral frequency equal to 10MHz. It communicates well via CAN with laptop CAN analyser software (both reception and transmission), using 50kb/s. Programmed to RAM using bootloader software (other programs works well, even with interrupts). Compiled on Linux using gcc, header file lpc21xx.h and crt0.s downloaded somewhere. * When I use polling for incoming message (C1GSR&0x1), everything works well. When I setup CAN receive interrupt handler, it does not work -- the handler is never called after message reception. Here is minimalized code (single-file), which works without ISR and fails using it. It toggles level at pin P0.7 after msg reception if DONT_USE_IRQ defined, P0.7 remains high if undefined. Any suggestions? Am I missing some point? Thank you very much for your help. Marek. ---CAN-does-not-work-with-Rx-ISR--- #include <stdlib.h> #include <types.h> #include <lpc21xx.h> //#define DONT_USE_IRQ typedef struct _can_msg_t { #define CAN_MSG_RTR 0x40000000 #define CAN_MSG_EXTID 0x80000000 uint32_t flags; unsigned short dlc; uint32_t id; unsigned char data[8]; } can_msg_t; void debug_toggle_pin() { if (IOPIN0 & 0x00000080) IOCLR0 |= 0x00000080; else IOSET0 |= 0x00000080; } void can_rx_isr(void) __attribute__ ((interrupt)); void can_init(uint32_t btr) { /* enable CAN1 Rx pin */ PINSEL1 |= 0x00040000; PINSEL1 &= 0xfff7ffff; /* receive all messages, no filtering */ AFMR = 0x2; /* reset mode */ C1MOD = 0x1; /* -- addition from lpc2000 maillist msg #3052: */ C1CMR = 0x0e; //Clear receive buffer, data overrun, abort tx /* -- end of addition */ C1IER = 0x0; C1GSR = 0x0; /* set baudrate & timing */ C1BTR = btr; /* set interrupt vector */ #ifndef DONT_USE_IRQ VICVectAddr0 = (uint32_t)can_rx_isr; VICVectCntl0 = 0x20 | 26; /* enable Rx int */ VICIntEnable = 0x04000000; C1IER = 0x1; #endif /* normal (operating) mode */ C1MOD = 0x0; #if 0 /* LPC2119 CAN.5 erratum workaround */ C1TFI1 = 0x00000000; C1TID1 = 0x0; C1CMR = 0x23; #endif } void can_rx_isr(void) { /** The Action **/ debug_toggle_pin(); /* release Rx buffer */ C1CMR = 0x4; /* int acknowledge */ VICVectAddr = 0xffffffff; } int can_tx_msg(can_msg_t *tx_msg) { uint32_t *data = (uint32_t*)tx_msg->data; /* check, if buffer is ready (previous Tx completed) */ if ((C1SR & 0x4) == 0) return -1; /* busy */ C1TFI1 = (tx_msg->flags & 0xc0000000) | ((tx_msg->dlc<<16) & 0x000f0000); C1TID1 = tx_msg->id; C1TDA1 = data[0]; C1TDB1 = data[1]; /* start transmission */ C1CMR = 0x30; //0x21; //0x30; //0x20; return 0; /* OK */ } void DefaultISR (void) __attribute__ ((interrupt)); void DefaultISR(void) { debug_toggle_pin(); for (;;); } int main() { can_msg_t msg; /*DEBUG*/ IODIR0 |= 0x00000080; IOSET0 |= 0x00000080; /* peripheral clock = CPU clock (10MHz) */ VPBDIV = 1; // --------------- VICIntEnClr = 0xFFFFFFFF; VICIntSelect = 0x00000000; VICDefVectAddr = (uint32_t)DefaultISR; // --------------- /* Tx test message */ msg.flags = 0; msg.dlc = 4; msg.id = 0x123; msg.data[0] = 'A'; msg.data[1] = 'h'; msg.data[2] = 'o'; msg.data[3] = 'j'; /* 0x25c013 -- 10MHz, 50kb/s, tested & measured -- OK */ can_init(0x25c013); /* send test msg */ while (can_tx_msg(&msg)); #ifdef DONT_USE_IRQ for (;;) if (C1GSR & 0x1) { debug_toggle_pin(); C1CMR = 0x4; } #else for (;;); #endif } ------------------THE-END---

An Engineer's Guide to the LPC2100 Series