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Writting Strings to External EEPROM

 
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wmeade



Joined: 08 Sep 2003
Posts: 16

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Writting Strings to External EEPROM
PostPosted: Wed Sep 10, 2003 10:50 am     Reply with quote
I need to make a menuing system to display on a 4x20 LCD. Instead of hard coding the menu I would like to store it on an external EEPROM. I have searched the group and have come up empty handed. As a test I would like to write "Hello World" to an External eeprom and read it back to a LCD. Is this possible?
Neutone



Joined: 08 Sep 2003
Posts: 839
Location: Houston

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Re: Writting Strings to External EEPROM
PostPosted: Wed Sep 10, 2003 11:41 am     Reply with quote
wmeade wrote:
I need to make a menuing system to display on a 4x20 LCD. Instead of hard coding the menu I would like to store it on an external EEPROM. I have searched the group and have come up empty handed. As a test I would like to write "Hello World" to an External eeprom and read it back to a LCD. Is this possible?


int8 String_Buffer[20]; // because is a x20 display
int8 String_Index; // because you want more than a single string
for(x=0;x<20;x++)
{ y=x+(String_Index*20)
String_Buffer[x] = read_EEPROM (y); // Move a byte from eeprom to RAM
}

I recomend using hard coding over this method because is saves parts.
wmeade



Joined: 08 Sep 2003
Posts: 16

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Re: Writting Strings to External EEPROM
PostPosted: Wed Sep 10, 2003 1:21 pm     Reply with quote
Thanks for your reply. I am not worried as much about using more parts as I am about running out of memory when programming. The Menu is ratherextensive with three levels. This aproach seems simpler to incorporate that a hard coded menu system. I haven't been able to find any examples in the forum on setting up a menu system for an lcd in picc. I have done several in PBP, but C is a whole nother animal.

Neutone wrote:
wmeade wrote:
I need to make a menuing system to display on a 4x20 LCD. Instead of hard coding the menu I would like to store it on an external EEPROM. I have searched the group and have come up empty handed. As a test I would like to write "Hello World" to an External eeprom and read it back to a LCD. Is this possible?


int8 String_Buffer[20]; // because is a x20 display
int8 String_Index; // because you want more than a single string
for(x=0;x<20;x++)
{ y=x+(String_Index*20)
String_Buffer[x] = read_EEPROM (y); // Move a byte from eeprom to RAM
}

I recomend using hard coding over this method because is saves parts.
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