Varriable im LPC2148 flash ablegen

Hi,
ich versuche auf dem lpc2148 ein paar Varriablen im Flash abzulegen.
Das schreiben ins Flash wollte ich folgendermassen realisieren:

Header:

/* IAP commands and varriables for flash programming */
// IAP start location on flash
#define IAP_LOCATION  0x7FFFFFF1
// contains parameters for IAP command
unsigned long iap_command[5];
// contains results, returned by "Blankcheck sector(s)"
unsigned long iap_result[2];
// typedefinition for IAP entry function
typedef void (*IAP) (unsigned long[],unsigned long[]);
IAP IAP_Entry;

.c File:

void IAP_Write (void)
{
  // setting function pointer
  IAP_Entry = (IAP) IAP_LOCATION;
  // IAP write command for prepare sectors for write
  // set command code
  iap_command[0] = 0x5010;
  // set start sector number
  iap_command[1] = 0x00070000;
  // set stop sector number
  iap_command[2] = 0x00070001;
  // these parameters not in use
  iap_command[3] = 0;
  iap_command[4] = 0;
  // prepare sectors for write
  IAP_Entry(iap_command,iap_result);

  // Copy RAM to Flash
  // set command code
  iap_command[0] = 0x5110;
  // destination flash where data byte to be written
  iap_command[1] = 0x00070000;
  // source RAM address where data bytes are to be read
  iap_command[2] = (unsigned long)&test;
  // number of bytes to be written
  iap_command[3] = 256;
  // set system clock frequency, unit kHz
  iap_command[4] = 60000;
  // prepare sectors for write
  IAP_Entry(iap_command,iap_result);
}

Wobei ich die Varriable unsigned char test im Falsh ablegen wollte.
Ausser stillzustehn macht das Programm allerdings nichtsmehr.
Kann mich jmd auf meine groben Denkfeheler hinweisen und/oder mir einen 
Beispiel code posten?!?

mfg
Marco