Posted on May 17, 2011 at 13:18Hi,
I have a propriatory bootloader which switches between application and bootloader via setting a couple of variables in the backup register ram which does not get erased on a reset.
The problem in question is that when i use the read protection below when the bootloader has loaded a application into the flash starting at 0x8008000 the chip erases the flash (so both bootloader and application) on reset.
When in debug, I can read protect and unprotect the bootloader as expected - the erase only happens when the application is loaded. I have tried doing the read protect at different points (before loading the application, after loading the application and in the application) all to the same conclusion - the flash gets fully erased.
This is my read protect/unprotect code:
void Debug_Read_Protection(FunctionalState u8Enable)
{
u32 u32iDelay;
CommsDebug_TxString(''\n\rP1'');
FLASH_Unlock();
if((FLASH->CR & CR_LOCK_Set) == 0)
{CommsDebug_TxString(''\n\rUnlocked'');}
else{CommsDebug_TxString(''\n\rLocked'');}
FLASH_ReadOutProtection(u8Enable);
FLASH_Lock();
// insert a delay here //
u32iDelay = (u32)70000000;
Debug_Print_FlashRegisters();
do
{u32iDelay--;}
while(u32iDelay!=0);
NVIC_GenerateSystemReset();
}// Debug_Read_Protection() //
void Debug_Print_FlashRegisters(void)
{
CommsDebug_TxString(''\n\rOBR = '');
CommsDebug_TxU32(FLASH->OBR);
CommsDebug_TxString(''\n\rCR = '');
CommsDebug_TxU32(FLASH->CR);
}// Debug_Print_FlashRegisters() //
Can anyone help??
