Programming Embedded Systems in C and C++ by Michael Barr

Author:Michael Barr [Barr, Michael]
Language: eng
Format: epub
Tags: comp_programming, comp_hard
ISBN: 1-56592-354-5
Publisher: O'Reilly
Published: 1999-12-14T16:00:00+00:00

6.4.1 Flash Drivers

Because it can be difficult to write data to the Flash device, it often makes sense to create a Flash driver. The purpose of the Flash driver is to hide the details of a specific chip from the rest of the software. This driver should present a simple application programming interface (API) consisting of the erase and write operations. Parts of the application software that need to modify data stored in Flash memory simply call the driver to handle the details. This allows the application programmer to make high-level requests like "erase the block at address D0000h" or "write a block of data, beginning at address D4000h." It also keeps the device-specific code separate, so it can be easily modified if another manufacturer's Flash device is later used.

A Flash driver for the amd 29f010 device on the arcom board is shown below. This driver contains just two functions: flashErase and flashWrite. These functions erase an entire sector and write an array of bytes, respectively. You should be able to see from the code listings that the interaction with the Flash device is no picnic. This code will work only with an AMD 29F010 device. However, the same API could be used with any Flash memory device.

#include "tgt188eb.h"

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