Posted on June 02, 2009 at 18:31I am running my protection routines from within Flash memory. I’ve written and tried out each of four calls, each invoked upon command through a serial data bus that communicates with the STR750FV2 via one of its UARTs. I’ve tried each one out, with varying results. The net result appears to be non-compliance with the specs in UM0116 User manual: STR7 family Flash programming.
I am using 7xx_flash.c
Each of the following was immediately preceded by a call to FLASH_DeInit() and followed by a call to FLASH_WaitForLastOperation().
This call had no effect at all on subsequent writing to Flash:
FLASH_WriteProtectionCmd(FLASH_BANK0_SECTOR0 |
FLASH_BANK0_SECTOR1 | FLASH_BANK0_SECTOR2 |
FLASH_BANK0_SECTOR3 | FLASH_BANK0_SECTOR4 |
FLASH_BANK0_SECTOR5 | FLASH_BANK0_SECTOR6 |
FLASH_BANK0_SECTOR7 | FLASH_BANK1_SECTOR0 |
FLASH_BANK1_SECTOR1, ENABLE);
This call had no effect at all on subsequent writing to Flash:
FLASH_WriteProtectionCmd(FLASH_BANK0_SECTOR2 |
FLASH_BANK0_SECTOR3 | FLASH_BANK0_SECTOR4 |
FLASH_BANK0_SECTOR5 | FLASH_BANK0_SECTOR6 |
FLASH_BANK0_SECTOR7 | FLASH_BANK1_SECTOR0 |
FLASH_BANK1_SECTOR1, DISABLE);
This call caused my target board to go completely dead immediately on execution. It does not boot or communicate on its serial ports, and is non-responsive to JTAG. It became non-responsive to JTAG from the moment that I transmitted the command to execute this procedure. I am unable to recover my target board from this state.
FLASH_PermanentProtectionCmd(ENABLE);
This call had no effect when I tried it before enabling permanent protection, and no effect when I tried it after enabling permanent protection when the unit was dead.
FLASH_PermanentProtectionCmd(DISABLE);
Any advice on offer will be most appreciated, either for reviving my dead board or for achieving the protection that ST's UM0116 manual offers. Thanks!
