Texas Instruments Tiva TM4C123GH6PM, User Manual

Page: 78 / 352

Flash
Description:
This function will make the currently programmed flash protection settings permanent. This is
a non-reversible operation; a chip reset or power cycle will not change the flash protection.
This function will not return until the protection has been saved.
Returns:
Returns 0 on success, or -1 if a hardware error is encountered.
8.2.1.9 ROM_FlashProtectSet
Sets the protection setting for a block of flash.
Prototype:
int32_t
ROM_FlashProtectSet(uint32_t ui32Address,
tFlashProtection eProtect)
ROM Location:
ROM_APITABLE
is an array of pointers located at
0x0100.0010
.
ROM_FLASHTABLE
is an array of pointers located at
ROM_APITABLE[7]
.
ROM_FlashProtectSet
is a function pointer located at
ROM_FLASHTABLE[5]
.
Parameters:
ui32Address is the start address of the flash block to be protected.
eProtect is the protection to be applied to the block. Can be one of FlashReadWrite ,
FlashReadOnly , or FlashExecuteOnly .
Description:
This function will set the protection for the specified 2 kB block of flash. Blocks which are
read/write can be made read-only or execute-only. Blocks which are read-only can be made
execute-only. Blocks which are execute-only cannot have their protection modified. Attempts
to make the block protection less stringent (that is, read-only to read/write) will result in a failure
(and be prevented by the hardware).
Changes to the flash protection are maintained only until the next reset. This allows the ap-
plication to be executed in the desired flash protection environment to check for inappropri-
ate flash access (via the flash interrupt). To make the flash protection permanent, use the
ROM_FlashProtectSave() function.
Returns:
Returns 0 on success, or -1 if an invalid address or an invalid protection was specified.
8.2.1.10 ROM_FlashUserGet
Gets the user registers.
Prototype:
int32_t
ROM_FlashUserGet(uint32_t *pui32User0,
uint32_t *pui32User1)
78 April 8, 2013