Battery

Projects Programming
1

Hi

My name is Trevor and am very new to Arduino and now almost nothing about C but am learning.

I need help. My first project is a tiny altimeter which I found on the net and interested me as I am a skydiver. I got all the components and wired them up, but when trying to compile the program I get an error Battery.c:8:9: error: variable 'Battery' must be const in order to be put into read-only section by means of 'attribute((progmem))'
uint8_t Battery[] PROGMEM = { which unfortunately means nothing to me nor can I fix the problem. I would really appreciate help...

2

We need to see the program to be able to help.

Please put your code in its own window as seen in other posts. This can be done by placing     [code]  and [/code]  around the code or use the </> icon. This makes it easier for others to read.

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3 
// Battery.c
// Font type    : Battery levels (5 icons)
// Font size    : 20x28 pixels
// Memory usage : 105 bytes

#include <avr/pgmspace.h>

uint8_t Battery[] PROGMEM={
  0x7f, 0xff, 0xf0, 
  0x40, 0x00, 0x10, 
  0xdd, 0xdd, 0xd0, 
  0xdd, 0xdd, 0xd0, 
  0xdd, 0xdd, 0xd0, 
  0x40, 0x00, 0x10, 
  0x7f, 0xff, 0xf0, 
  0x7f, 0xff, 0xf0, 
  0x40, 0x00, 0x10, 
  0xc1, 0xdd, 0xd0, 
  0xc1, 0xdd, 0xd0, 
  0xc1, 0xdd, 0xd0, 
  0x40, 0x00, 0x10, 
  0x7f, 0xff, 0xf0, 
  0x7f, 0xff, 0xf0, 
  0x40, 0x00, 0x10, 
  0xc0, 0x1d, 0xd0, 
  0xc0, 0x1d, 0xd0, 
  0xc0, 0x1d, 0xd0, 
  0x40, 0x00, 0x10, 
  0x7f, 0xff, 0xf0, 
  0x7f, 0xff, 0xf0, 
  0x40, 0x00, 0x10, 
  0xc0, 0x01, 0xd0, 
  0xc0, 0x01, 0xd0, 
  0xc0, 0x01, 0xd0, 
  0x40, 0x00, 0x10, 
  0x7f, 0xff, 0xf0,
  0x7f, 0xff, 0xf0, 
  0x40, 0x00, 0x10, 
  0xc0, 0x00, 0x10, 
  0xc0, 0x00, 0x10, 
  0xc0, 0x00, 0x10, 
  0x40, 0x00, 0x10, 
  0x7f, 0xff, 0xf0
};
4

The above code is part of a sketch, but when compiling I get the error from the battery tab.

Thanks
Trevor.

5

Try doing a search (top right hand corner) for 'must be const in order to be put'.

6 
uint8_t Battery[] PROGMEM={

Battery.c:8:9: error: variable 'Battery' must be const

So, why is Battery NOT const? Is the message that difficult to understand?

7

Sorry very new at this... First time :smiley:

8

TrevorSA:
Sorry very new at this... First time :smiley:

I'm wondering the same thing... Did You ever find out what was wrong?

9

kakemanx:
I'm wondering the same thing... Did You ever find out what was wrong?

Heh...yeah, he figured it out in posts #5 and #6. He just needed to add the keyword const before the data defined in PROGMEM.

const uint8_t Battery[] PROGMEM={

Honestly though, if you can't debug that simple of an error you'd do well to sit down with a basic tutorial for C. It'll save time in the long run.