LPC2138 Flash Write Problem

(Apologies if posted twice, couldn't find message)

I am trying to get Flash write working on LPC2138 with no sucess. Code is below. Any help appriciated.

typedef void (*IAP)(unsigned int [],unsigned int []); IAP iap_bypointer; void iap_byfunction (unsigned *cmd,unsigned *rslt,unsigned entry);

unsigned int command[5]; unsigned int result[5]; char Ram_Arry[512] = "Hello World"; char *Ram_Pointer;

void flash_write(void) { unsigned char index;

iap_bypointer = (IAP) 0x7FFFFFF1; //set IAP entry address in functio pointer

//Ram_Pointer = &Ram_Arry[0]; Ram_Pointer = 0x40005000;

for (index = 0; index