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XFLASH DRIVER

1.3 IMPLEMENTATION GUIDELINES

An example is used to describe some generic guidelines you have to follow when developing

an application with IAP capability. It includes all the modules you need for an application with

IAP:

s

Reset and initialization routines

s

Basic user interface

s

Reprogramming routines (On external Interrupt)

s

Reprogrammable software module in sector 1

Figure 2. Example Flowchart

1.3.1 Project Configuration

1.3.1.1 Driver Configuration

The first step is to correctly configure the stack position in the Xflash.h file. This parameter is

defined by the variable STACK_END. The XFlash driver uses this value to address its internal

variables located at the top of RAM Page 0.

1.3.1.2 Program Memory

Special attention must be paid to the fact that some routines have to be executed from Sector

0 to ensure reliable operations.

Therefore pragmas have to be defined in such a way that Sector 0 includes: the XFlash driver,

the Reset, Initialization and UserWhileWriteBlock routines as well as any library routines

(Delay loops,..) needed for the reprogramming process.

Begin

Initialization

Endless loop in sector1

External Interrupt

Load new program

from external EEPROM to buffer

Start programming phase

Software Reset