Hello,
I am attempting to write to eeprom (0x400 to 0xFEF). I am using:
CW 5.9.0
MC9S12DT256CFU (on an axiom CSM12DT256 Dev Board, 4MHz Xtal)
P&E USB Multilink REV C.
When I let the code run, it appears nothing happens. The memory viewer in the debugger shows no change for any of the locations, and the only registers that seem to change are ECLKDIV, EPROT, and ECMD.
eeprom.c:
#include <std_types.h>
#include <hidef.h>
#include <mc9s12dt256.h>
void eepromInit(void)
{
ECLKDIV = 0x14; //FDIV = 4MHz / 20 = 190kHz
ECNFG = 0x00; //No interrupts
EPROT = 0x88; //No protect
ESTAT = 0x30; //Clear status
while((ESTAT&0x80)==0)
{}
ECMD = 0x60; //Erase all EEPROM
ESTAT = 0x80; //launch command
return;
}
void eepromWrite(uint16 address, uint8 data)
{
uint16 *dataPtr, *addressPtr;
short okToWrite;
uint8 status, ACCERR, PVIOL, CBEIF;
okToWrite = 0;
PORTB_BIT4 = 0; //LED1 on
CBEIF = 0;
PVIOL = 0;
ACCERR = 0;
status = 0;
addressPtr = (uint16*)(address);
dataPtr = (uint16*)data;
while((ESTAT&0x80)==0)
{}
/*
while(!okToWrite)
{
status = ESTAT;
ACCERR = (0x10 & status)/0x10;//bit mask to extract value of ACCERR from ESTAT Register
PVIOL = (0x20 & status)/0x20;//same as above but PVIOL
CBEIF = (0x80 & status)/0x80;//same but CBEIF
if((!ACCERR) && (!PVIOL) && CBEIF)
okToWrite = 1;
}
*/
*(addressPtr) = *(dataPtr); //latch data and eeprom loc
ECMD = 0x20; //Program
ESTAT = 0x80; //launch command
while((ESTAT&0x80)==0){} //waits for writing to end
PORTB_BIT4 = 1; //LED1 off
return;
}main.c:
#include <hidef.h> /* common defines and macros */
#include <mc9s12dt256.h> /* derivative-specific definitions */
#include "eeprom.c"
#include <std_types.h>
#pragma LINK_INFO DERIVATIVE "mc9s12dt256b"
void main(void)
{
uint8 writeData;
uint16 i, address;
DDRAB = 0xFFFF;
writeData = 0x21; //exclamation point
eepromInit();
PORTB_BIT4 = 0; //led4 on
for(i = 0; i < 50000; i ++){}//delay
PORTB_BIT4 = 1; //led4 off
for(address = 0x400; address < 0xFEF; address++)
eepromWrite(address, writeData);
PORTB_BIT4 = 0; //led4 on
}
Thanks,
JT
