Re: [avr-gcc-list] avr-gcc - global variables

[Mikael Krus]

-------- Original Message --------
Subject:        Re: [avr-gcc-list] avr-gcc - global variables
Date:   Wed, 29 Sep 2004 08:00:10 +0200
From:   Mikael Krus <address@hidden>
To:     Stein Haaland <address@hidden>
References:     <address@hidden>



Your character matrix is very large. Isn't it in fact larger than the 
available amount of SRAM in AT90S8515????

/Mikael Krus

Stein Haaland wrote:

> I am trying to write a number of bytes into EEPROM
> (actually a set of characters for a 5x7 dot matrix),
> and need some help with global variables :
>
>
> a) What is wrong with the following code :
>
> //
> // character = global variable
> //
> volatile uint8_t character[90][7] =
> {
> { 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F },
> { 0x13, 0x13, 0x13, 0x13, 0x13, 0x1F, 0x13 },
> { 0x15, 0x15, 0x15, 0x1F, 0x1F, 0x1F, 0x1F },
> { ... }
> };
>
>
> void fill_eeprom()
> {
>  uint8_t val;
>  uint16_t i,j,addr;
>  
>  for (i=0; i<90; i++) {
>     for (j=0; j<7; j++) { 
>       addr = 7*i+j; 
>       val = character[i][j];
>       eeprom_wb(addr,val);
>       PORTC = ~val;
>       wait(400); 
>       PORTC = ~0x00;
>       wait(400); 
>     } 
>  }
> }
>
> void main(void)
> { 
>  ....
> }
>
>
> Port C switches between 0xFF (= ~0x00) and 0x00 - no sign
> of my character table.
>
>
> b) Is there a better way to do this than the above approach ?
>
>
> Sys :
> MDK Linux 10.0.
> avr-gcc (GCC) 3.3.2 
> objcopy 2.14 20030612
> uisp version 20040311
> STK500 testboard, AT90S8515
>
> ------
> SEH.
>
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