Posted on May 17, 2011 at 13:11I am just testing the ''Read Protection'' feature of the STM32. I am using Rowley's CrossStudio 1.7 IDE.
To enable the ''Read Protection'' I am using the following code:
if (FLASH_GetReadOutProtectionStatus() == RESET)
{
FLASH_ClearFlag (FLASH_FLAG_BSY | FLASH_FLAG_EOP |
FLASH_FLAG_PGERR | FLASH_FLAG_WRPRTERR);
FLASH_EnableWriteProtection (FLASH_WRProt_Pages2to3 |
FLASH_WRProt_Pages4to5 |
FLASH_WRProt_Pages6to7 |
FLASH_WRProt_Pages8to9);
FLASH_ClearFlag (FLASH_FLAG_BSY | FLASH_FLAG_EOP |
FLASH_FLAG_PGERR | FLASH_FLAG_WRPRTERR);
FLASH_ReadOutProtection (ENABLE);
NVIC_GenerateSystemReset();
}
This seems to work (tested with the Flash Loader Demo).
But after enable the ''Read Protection'' the start up code of CrossStudio seems to be no longer working. I am getting a ''Hard Fault Exception'' in ''thumb_crt0.s''. I think it happens, when the default values of the variables are copied from the Flash to the SRAM.
Any ideas?
