Hi, I've been trying to learn LPC2138 and GCC for a month now, thank to
the examples and docs provided by Martin the venture is not so
difficult.

I am using a homebuilt board, aside from lots of jumpers it seems to be
working well. It has taken a me good week to figure out how to use
interrupt with RTC, and finally it works. I'm having trouble with the
"rtcif" variable it seems never get changed. I am polling for rtcif in
main to reset it and turn LED5 off. The "tick" variable tho is ok since
I can see the blink on the other led1, but nothing on LED5. Can someone
explain to me what I'm doing wrong.

void rtcISR(void)
{
    ISR_ENTRY();
    if (rtcif==0)
    {
        rtcif=1;
        IO0SET = LED5_BIT;

    }
    if (tick==0)
    {
        tick=1;
        IO0CLR = LED1_BIT;
    }
    else
    {
        tick=0;
        IO0SET = LED1_BIT;
    }

    RTCILR = 1;     // Clear interrupt flag
    VICVectAddr = 0;     // Acknowledge Interrupt
    ISR_EXIT();   // recover registers and return
}

//globals
uint32_t volatile tick=0;
uint32_t volatile rtcif = 0;

RTCTime local_time,  current_time;

int main(void){
//system initialization here...
//set local_time here...

IO0SET = LED5_BIT;//LED5 off

    for (;;)
    {
        if (rtcif==1)
        {
            IO0CLR = LED5_BIT;
            rtcif=0;
        }
        current_time = RTCGetTime();
        //glcd_clearline(15);
        glcd_gotoxy(20,15);
        xprintf("%2u:%2u:%2u", current_time.RTC_Hour,
current_time.RTC_Min, current_time.RTC_Sec);

    } // for
return 0;
}

I added this in case it might help.

 44:rtcISR.c      ****     if (rtcif==0)
  26                r2, .L8
  27 0010 70209FE5     ldrh  r3, [r2, #0]
  28 0014 B030D2E1     cmp  r3, #0
  29 0018 000053E3     .loc 1 46 0
  45:rtcISR.c      ****     {
  46:rtcISR.c      ****         rtcif=1;
  30                eq  r3, #1  @ movhi
  31 001c 0130A003     streqh  r3, [r2, #0]  @ movhi
  32 0020 B030C201     .loc 1 47 0
  47:rtcISR.c      ****         IO0SET = LED5_BIT;
  33                req  r3, .L8+4
  34 0024 60309F05     moveq  r2, #-2147483648
  35 0028 0221A003     streq  r2, [r3, #4]
  36 002c 04208305     .loc 1 50 0
  48:rtcISR.c      ****
  49:rtcISR.c      ****     }
  50:rtcISR.c      ****     if (tick==0)
  37                  r2, .L8+8
  38 0030 58209FE5     ldr  r3, [r2, #0]
  39 0034 003092E5     cmp  r3, #0
  40 0038 000053E3     .loc 1 52 0
  51:rtcISR.c      ****     {
  52:rtcISR.c      ****         tick=1;
  41                eq  r3, r3, #1
  42 003c 01308302     .loc 1 57 0
  53:rtcISR.c      ****         IO0CLR = LED1_BIT;
  54:rtcISR.c      ****     }
  55:rtcISR.c      ****     else
  56:rtcISR.c      ****     {
  57:rtcISR.c      ****         tick=0;
  43                ovne  r3, #0
  44 0040 0030A013     .loc 1 52 0
  45                  streq  r3, [r2, #0]
  46 0044 00308205     .loc 1 57 0
  47                  strne  r3, [r2, #0]
  48 0048 00308215     .loc 1 53 0
  49                  ldreq  r3, .L8+4
  50 004c 38309F05     .loc 1 58 0
  58:rtcISR.c      ****         IO0SET = LED1_BIT;
  51                3, .L8+4
  52 0050 34309F15     .loc 1 53 0
  53                  moveq  r2, #134217728
  54 0054 0223A003     .loc 1 58 0
  55                  movne  r2, #134217728
  56 0058 0223A013     .loc 1 53 0
  57                  streq  r2, [r3, #12]
  58 005c 0C208305     .loc 1 58 0
  59                  strne  r2, [r3, #4]
  60 0060 04208315     .loc 1 62 0
  59:rtcISR.c      ****     }