I’ve been asked about how to store data table in flash memory using winavr toolset. I decided to post an answer here. Might be someone find this useful.

To demonstrate this I have set up a project using VMLAB simulator. The files you can download from here: Small project using VMLAB simulator

So I created project in VMLAB. You should read my previous article ho to do this: Using VMLAB as virtual oscilloscope

In project window I have connected 8 LED’s to port D by typing this:

D1 VDD PD0

D2 VDD PD1

D3 VDD PD2

D4 VDD PD3

D5 VDD PD4

D6 VDD PD5

D7 VDD PD6

D8 VDD PD7

Then I wrote a simple C program:

In program you see, that data can be stored in flash memory using data describing sentence:

const uint8_t digits[] PROGMEM={your data};

To make PROGMEM macro work you have to include library pgmspace.h.

Bellow you see result of simulation in VMLAB environment:

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This entry was posted on Monday, June 19th, 2006 at 4:58 pm and is filed under AVR Microcontrollers. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.