Was the flash erased beforehand?
Here is the code I've used for programming flash. It is
in use in the field in a very large number of installations.
It is in IAR format but the conversion should be easy.
Regards
-Bill Knight
R O SOftWare
flash.h
------
#ifndef INC_FLASH_H
#define INC_FLASH_H
#include "typedefs.h"
void flashEraseSector(void *addr);
void flashProgramBlock(void *addr, void *data, uint16 count);
#define flashProgramMemory(addr, data) flashProgramBlock(addr, data, sizeof
(data));
#endif
flash.c
-------
#define FCLK_FREQ (450e3) // flash programming clock frequency
#define FCLK_DIVIDER (MCLK / FCLK_FREQ) // good from 1 to 64
/******************************************************************************
*
* Function Name: void _flashControl()
*
* Description:
* This low level function checks the value of 'count' and if
* non-zero writes the referenced data to flash. If it is zero, it
* erases the flash sector containing the address.
*
* Calling Sequence:
* uint8 *addr destination address in flash
* uint8 *data pointer to data to write
* uint16 count number of bytes to write
*
* Returns:
* void
*
* NOTE: this function is marked 'monitor' so the compiler will save
* the current interrupt state on entry and restore it on exit.
*****************************************************************************/
static monitor void _flashControl(uint8 *addr, uint8 *data, uint16 count)
{
uint8 ie1;
ie1 = IE1; // get current interrupt enables
IE1 &= ~(NMIIE | ACCVIE | OFIE); // disable enabled interrupts
FCTL2 = FWKEY + // key
FSSEL_1 + // use MCLK
FCLK_DIVIDER; // setup divider - 1..64
FCTL3 = FWKEY; // LOCK = 0
if (count)
{
FCTL1 = FWKEY | WRT; // set WRITE bit
do // loop through, writing the data
*addr++ = *data++;
while (--count);
}
else
{
FCTL1 = FWKEY | ERASE; // set ERASE bit
*addr = 0; // write to address in sector to start
erase
}
FCTL1 = FWKEY; // clear WRITE/ERASE bit
FCTL3 = FWKEY | LOCK; // LOCK = 1
IE1 = ie1; // restore interrupt enables
}
/******************************************************************************
*
* Function Name: void flashEraseSector()
*
* Description:
* Erase one flash sector
*
* Calling Sequence:
* void *addr address within sector to be erased
*
* Returns:
* void
*
*****************************************************************************/
void flashEraseSector(void *addr)
{
_flashControl(addr, NULL, 0);
}
/******************************************************************************
*
* Function Name: void flashProgramBlock()
*
* Description:
* Program a block of data in flash
*
* Calling Sequence:
* void *addr destination address in flash
* void *data pointer to data to write
* uint16 count number of bytes to write
*
* Returns:
* void
*
*****************************************************************************/
void flashProgramBlock(void *addr, void *data, uint16 count)
{
_flashControl(addr, data, count);
}
