Posted on September 01, 2015 at 08:46
You can have both, but before you start with sector delete for your code and other stuff, make sure you disable read protection with software first.
IAP example software AN3965 shows how to disable write protection before sector erase if it is enabled.
Below functions shows my implementation. I use the same technic with bootloader and main program as you do.
/* Value
FLASHLOADER.ApplicationStartSector is the sector number */
uint8_t TM_FLASHLOADER_DisableWP(void) {
uint8_t UserWrpSectors;
/* Mark all sectors inside the user flash area as non protected */
UserWrpSectors = 0xFFF - ((1 << (FLASHLOADER.ApplicationStartSector / 8)) - 1);
/* Unlock the Option Bytes */
FLASH_OB_Unlock();
/* Disable the write protection for all sectors inside the user flash area */
FLASH_OB_WRPConfig(UserWrpSectors, DISABLE);
/* Returns status, 0 = OK, 1 = Error */
if
(FLASH_OB_Launch() != FLASH_COMPLETE) {
/* return error */
return
1;
}
/* Lock option bytes */
FLASH_OB_Lock();
/* Return OK */
return
0;
}
uint8_t TM_FLASHLOADER_EnableWP(void) {
uint8_t UserWrpSectors;
/* Mark all sectors inside the user flash area as non protected */
UserWrpSectors = 0xFFF - ((1 << (FLASHLOADER.ApplicationStartSector / 8)) - 1);
/* Unlock the Option Bytes */
FLASH_OB_Unlock();
/* Disable the write protection for all sectors inside the user flash area */
FLASH_OB_WRPConfig(UserWrpSectors, ENABLE);
/* Returns status, 0 = OK, 1 = Error */
if
(FLASH_OB_Launch() != FLASH_COMPLETE) {
/* Return error */
return
1;
}
/* Lock option bytes */
FLASH_OB_Lock();
/* Return OK */
return
0;
}
