compresion

hi.

i have written a program which does a lot of very complex and clever things. but it is very big. it is very big. how can i compress it in the rom? like upx does on linux. how can can i decompress it. there is no decompress function in keil.

 RE: compresion

Having compressed programs in ROM only works for a processor that copies the program into RAM before running it.

You specify a C51 architecture - so do you really have a 8051 chip that supports copying of flash content into RAM for execution?

 RE: compresion

hi.

i dont understand you. why copy it to ram? i mean what will it do? the cpu runs code from rom not ram. and i will put my extreme calculation results in ram and there will not be any space for a copy of the rom. he said use some ddr ram for it.

 RE: compresion

The processor can't run compressed code.

So architectures where compressed code are stored in flash are decompressing that code and placing the decompressed result in RAM - the processor then runs the program from RAM.

In short - they use the flash memory as a type of hard drive, similar to how programs are run on a normal PC.

"he said use some ddr ram for it."

Who is "he"?

Do you really have a 8051 chip that supports DDR memory???