AN2540 datasheet(12/25 Pages) STMICROELECTRONICS

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Implementing the EEPROM emulation

AN2540 - Application note

12/25

3.2.2.1 User API definition

Table 2.

EepromFormat

Function Name

EepromFormat

Function Prototype

u8 EepromFormat(void);

Behavior Description

This function erases sector0 and sector1 and writes a

VALID_SECTOR header to sector0.

Input Parameter

None

Return Parameter

Status of the operation.

Called functions

FMI_EraseSector,FMI_WaitForLastOperation,FMI_WriteHalfWord

Table 3.

FindValidSector

Function Name

FindValidSector

Function Prototype

u8 FindValidSector(u8 operation);

Behavior Description

This function reads both sector’s headers and returns the sector

number which contains valid data.

Input Parameter

A byte indicating that we are looking for a valid sector for write or read

operation(READ_FROM_VALID_SECTOR or

WRITE_IN_VALID_SECTOR

Return Parameter

Sector number.

Called functions

FMI_ReadWord.

Table 4.

ReadVariable

Function Name

ReadVariable

Function Prototype

u16 ReadVariable(u8 index, u32 *T);

Behavior Description

This function reads variable data. Only last update is read. The

function enters a loop in which it reads the variable entries until the

last one is found. Finally, the data is returned.

Input Parameter

– index: variable identifier

– T: variable array

Return Parameter

Returns 16-bit read data on success or error code on failure.

Called functions

FindValidSector.

Table 5.

WriteVariable

Function Name

WriteVariable

Function Prototype

u8 WriteVariable(u8 index, u32 *T, u16 data);

Behavior Description

This function is called by the user application to update a variable

Input Parameter

– index: variable identifier

– T: variable array

– data: 16-bit data to be written

Return Parameter

Returns 1 on success or error code on failure

Called functions

WriteVerifyVariableFull, EepromSectorTransfer.

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