main.c

#include <stdbool.h>
#include <stdint.h>

__sfr __at 0x00 ioLED;

__sfr __at 0x10 ioID0;
__sfr __at 0x11 ioID1;
__sfr __at 0x12 ioID2;
__sfr __at 0x13 ioID3;
__sfr __at 0x14 ioID4;
__sfr __at 0x15 ioID5;
__sfr __at 0x16 ioID6;
__sfr __at 0x17 ioID7;

__sfr __at 0x20 ioSerialData;
__sfr __at 0x21 ioSerialRValid;
__sfr __at 0x22 ioSerialRAvailL;
__sfr __at 0x23 ioSerialRAvailH;

__sfr __at 0x24 ioSerialEnable;
__sfr __at 0x25 ioSerialInterrupt;
__sfr __at 0x26 ioSerialWSpaceL;
__sfr __at 0x27 ioSerialWSpaceH;

volatile __at 0x8000 uint8_t memID[8];
volatile __at 0x8008 uint8_t memLED0;
volatile __at 0x8009 uint8_t memLED1;

void sleep(uint8_t amt) {
    while (amt > 0) {
        uint16_t counter = 0xffff;
        while (counter > 0)
            counter--;
        amt--;
    }
}

void main() {
    memID[0] = ioID0;
    memID[1] = ioID1;
    memID[2] = ioID2;
    memID[3] = ioID3;
    memID[4] = ioID4;
    memID[5] = ioID5;
    memID[6] = ioID6;
    memID[7] = ioID7;

    memLED0 = 0;
    while (true) {
        sleep(10);
        //ioLED = memLED0;
        //memLED0++;
        //memLED1 = ioLED;
        ioLED = ioSerialData;
    }
}