|Kiran V. Sutar
Read: 1399 times
|#190378 - How to init a variable in ROM|
I am using AT89S52.
The program Length is about 1k.
I need to program the ID of the product.
This ID is to be displayed by the product after Power ON.
I want to give the freedom to my customer to program this ID, But I do NOT want to give the source code. Instead, I will be giving him the HEX file. My customer knows how to download the HEX file into the CPU. I will give him the address of the unused location such as 0xff0, and tell him to program this location with the ID when downloading the program into the CPU.
I have used the following: to read memory location 0xff0:
unsigned char code *Ptr=0xFF0; ID=*Ptr;
This is working fine, no problem.
The problem is:
Whenever I compile the code, this location is initialized to 0xff. I need to initialize this memory location (with a default ID) whenever I compile the source code.
How to initialize an unused ROM location in C?
|How to init a variable in ROM||Kiran V. Sutar||11/19/14 21:39|
|You can NOT write to ROM||David Prentice||11/20/14 04:35|
|Hex file||Daniel Contarino||11/20/14 15:18|
|Initialize code||Daniel Contarino||11/20/14 15:27|
|toolchain?||Maarten Brock||11/29/14 01:36|
|Using SDCC...||Oliver Sedlacek||12/11/14 05:50|
|that chip does not have any ROM||Erik Malund||12/12/14 08:50|
|Here is the solution I was looking for||Kiran V. Sutar||12/19/14 08:33|