OTP: One-Time Programmable memory and API

Overview

The MCUXpresso SDK provides a peripheral driver for the OTP module of MCUXpresso SDK devices.

Main clock has to be set to a frequency stated in user manual prior to using OTP driver. OTP memory is manipulated by calling provided API stored in ROM. MCUXpresso SDK driver encapsulates this.

OTP example

This example shows how to write to OTP.

Refer to the driver examples codes located at <SDK_ROOT>/boards/<BOARD>/driver_examples/otp

Enumerations
enum	otp_bank_t {   kOTP_Bank0 = 0x1U,   kOTP_Bank1 = 0x2U,   kOTP_Bank2 = 0x4U,   kOTP_Bank3 = 0x8U }
	Bank bit flags. More...
enum	otp_word_t {   kOTP_Word0 = 0x1U,   kOTP_Word1 = 0x2U,   kOTP_Word2 = 0x4U,   kOTP_Word3 = 0x8U }
	Bank word bit flags. More...
enum	otp_lock_t {   kOTP_LockDontLock = 0U,   kOTP_LockLock = 1U }
	Lock modifications of a read or write access to a bank register. More...
enum	_otp_status {   kStatus_OTP_WrEnableInvalid = MAKE_STATUS(kStatusGroup_OTP, 0x1U),   kStatus_OTP_SomeBitsAlreadyProgrammed = MAKE_STATUS(kStatusGroup_OTP, 0x2U),   kStatus_OTP_AllDataOrMaskZero = MAKE_STATUS(kStatusGroup_OTP, 0x3U),   kStatus_OTP_WriteAccessLocked = MAKE_STATUS(kStatusGroup_OTP, 0x4U),   kStatus_OTP_ReadDataMismatch = MAKE_STATUS(kStatusGroup_OTP, 0x5U),   kStatus_OTP_UsbIdEnabled = MAKE_STATUS(kStatusGroup_OTP, 0x6U),   kStatus_OTP_EthMacEnabled = MAKE_STATUS(kStatusGroup_OTP, 0x7U),   kStatus_OTP_AesKeysEnabled = MAKE_STATUS(kStatusGroup_OTP, 0x8U),   kStatus_OTP_IllegalBank = MAKE_STATUS(kStatusGroup_OTP, 0x9U),   kStatus_OTP_ShufflerConfigNotValid = MAKE_STATUS(kStatusGroup_OTP, 0xAU),   kStatus_OTP_ShufflerNotEnabled = MAKE_STATUS(kStatusGroup_OTP, 0xBU),   kStatus_OTP_ShufflerCanOnlyProgSingleKey,   kStatus_OTP_IllegalProgramData = MAKE_STATUS(kStatusGroup_OTP, 0xCU),   kStatus_OTP_ReadAccessLocked = MAKE_STATUS(kStatusGroup_OTP, 0xDU) }
	OTP error codes. More...

Functions
static status_t	OTP_Init (void)
	Initializes OTP controller. More...
static status_t	OTP_EnableBankWriteMask (otp_bank_t bankMask)
	Unlock one or more OTP banks for write access. More...
static status_t	OTP_DisableBankWriteMask (otp_bank_t bankMask)
	Lock one or more OTP banks for write access. More...
static status_t	OTP_EnableBankWriteLock (uint32_t bankIndex, otp_word_t regEnableMask, otp_word_t regDisableMask, otp_lock_t lockWrite)
	Locks or unlocks write access to a register of an OTP bank and possibly lock un/locking of it. More...
static status_t	OTP_EnableBankReadLock (uint32_t bankIndex, otp_word_t regEnableMask, otp_word_t regDisableMask, otp_lock_t lockWrite)
	Locks or unlocks read access to a register of an OTP bank and possibly lock un/locking of it. More...
static status_t	OTP_ProgramRegister (uint32_t bankIndex, uint32_t regIndex, uint32_t value)
	Program a single register in an OTP bank. More...
static uint32_t	OTP_GetDriverVersion (void)
	Returns the version of the OTP driver in ROM. More...

Driver version
#define	FSL_OTP_DRIVER_VERSION   (MAKE_VERSION(2, 0, 0))
	OTP driver version 2.0.0. More...

Macro Definition Documentation

#define FSL_OTP_DRIVER_VERSION   (MAKE_VERSION(2, 0, 0))

Current version: 2.0.0

Change log:

• Version 2.0.0
  • Initial version.

Enumeration Type Documentation

enum otp_bank_t

Enumerator
kOTP_Bank0	Bank 0.
kOTP_Bank1	Bank 1.
kOTP_Bank2	Bank 2.
kOTP_Bank3	Bank 3.

enum otp_word_t

Enumerator
kOTP_Word0	Word 0.
kOTP_Word1	Word 1.
kOTP_Word2	Word 2.
kOTP_Word3	Word 3.

enum otp_lock_t

Enumerator
kOTP_LockDontLock	Do not lock.
kOTP_LockLock	Lock till reset.

enum _otp_status

Enumerator
kStatus_OTP_WrEnableInvalid	Write enable invalid.
kStatus_OTP_SomeBitsAlreadyProgrammed	Some bits already programmed.
kStatus_OTP_AllDataOrMaskZero	All data or mask zero.
kStatus_OTP_WriteAccessLocked	Write access locked.
kStatus_OTP_ReadDataMismatch	Read data mismatch.
kStatus_OTP_UsbIdEnabled	USB ID enabled.
kStatus_OTP_EthMacEnabled	Ethernet MAC enabled.
kStatus_OTP_AesKeysEnabled	AES keys enabled.
kStatus_OTP_IllegalBank	Illegal bank.
kStatus_OTP_ShufflerConfigNotValid	Shuffler config not valid.
kStatus_OTP_ShufflerNotEnabled	Shuffler not enabled.
kStatus_OTP_ShufflerCanOnlyProgSingleKey	Shuffler can only program single key.
kStatus_OTP_IllegalProgramData	Illegal program data.
kStatus_OTP_ReadAccessLocked	Read access locked.

Function Documentation

static status_t OTP_Init ( void  )

inlinestatic

Returns

kStatus_Success upon successful execution, error status otherwise.

static status_t OTP_EnableBankWriteMask ( otp_bank_t  bankMask )

inlinestatic

Parameters

bankMask

bit flag that specifies which banks to unlock.

Returns

kStatus_Success upon successful execution, error status otherwise.

static status_t OTP_DisableBankWriteMask ( otp_bank_t  bankMask )

inlinestatic

Parameters

bankMask

bit flag that specifies which banks to lock.

Returns

kStatus_Success upon successful execution, error status otherwise.

static status_t OTP_EnableBankWriteLock ( uint32_t  bankIndex, otp_word_t  regEnableMask, otp_word_t  regDisableMask, otp_lock_t  lockWrite  )

inlinestatic

Parameters

bankIndex	OTP bank index, 0 = bank 0, 1 = bank 1 etc.
regEnableMask	bit flag that specifies for which words to enable writing.
regDisableMask	bit flag that specifies for which words to disable writing.
lockWrite	specifies if access set can be modified or is locked till reset.

Returns

kStatus_Success upon successful execution, error status otherwise.

static status_t OTP_EnableBankReadLock ( uint32_t  bankIndex, otp_word_t  regEnableMask, otp_word_t  regDisableMask, otp_lock_t  lockWrite  )

inlinestatic

Parameters

bankIndex	OTP bank index, 0 = bank 0, 1 = bank 1 etc.
regEnableMask	bit flag that specifies for which words to enable reading.
regDisableMask	bit flag that specifies for which words to disable reading.
lockWrite	specifies if access set can be modified or is locked till reset.

Returns

kStatus_Success upon successful execution, error status otherwise.

static status_t OTP_ProgramRegister ( uint32_t  bankIndex, uint32_t  regIndex, uint32_t  value  )

inlinestatic

Parameters

bankIndex	OTP bank index, 0 = bank 0, 1 = bank 1 etc.
regIndex	OTP register index.
value	value to write.

Returns

kStatus_Success upon successful execution, error status otherwise.

static uint32_t OTP_GetDriverVersion ( void  )

inlinestatic

Returns

version.