RTOS for 8051

hi

I have to make an rtos for 8051. this is initial state and i will really appreciate if someone can answer these questions :

1: what are the functions performed by bootloader during startup of the chip? if i can exceute a program on my chip stored at any location in memory then wht do i mean by making a separate OS?

2:will i require memmory mapping programs too such as page management or is it all already taken care by bootloader?


ur ideas will be of gr8 help

thanxs

soni

Comments

  • Hi Sony,

    I really appreciate your efforts in designing an RTOS for 8051. But so many are available free of cost on the net. If you have Keil, RTX51 ships with that.

    A boot loader initializes the chip. This can range from checking the RAM to initializing the stack pointer. All the I/O pins are initialized by this program.
    RTOS comes into picture when so many tasks are to be executed parallely in real time. But as you know, a cpu can execute only one task at a time. So the technique is to switch the tasks very frequently so as to make the apperance of simultenous multitasking. Without a real time kernel this is impossible.
    As far as an embedded system is considered, display and memory is the biggest constrain. Paging is appicable only to huge memory models like a PC. With just 128 bytes of RAM, you can not store even the page tables........ ;)

    Try reading "Operating system concepts" by gange or just mail me at johnson@christian.net for some presentations about the memory management in operating systems.

    Regards,
    Johnson.
Sign In or Register to comment.

Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!

Categories

In this Discussion