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x10 home automation


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fasil

Sat May 19 2007, 07:16PM

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i am trying to implement x10 using p89c51rd2 mcu.
i have the code to run the x10 protocol for PIC16F877
I am having a hard time to change the code to run on
p89c51rd2 since they use totally different memory organization. is there any one one who can help me?
i have attached the code for the PIC.
Do you have any thing that can help me , a book on the 80c51 mcu family etc.....

1179627400_1142_FT0_an236.zip

fasile

X10 protocol P89C51RD2 PIC16F877 X10 with 8051 home automation

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tienduhieu

Ajay

Sun May 20 2007, 01:13PM

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Hi fasil,
well i think you can help yourself in better way

before changing that code you must understand what X10 protocol is and how it works. for that i have few links for you. please go through them, they are very useful.

http://en.wikipedia.org/wiki/X10_(industry_standard)
http://www.x10.com/technology1.htm

please go through them. will be helpful for you.

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fasil

Sun May 20 2007, 01:52PM

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thank you Rickey
i know the x10 protocol very well. i have gone through those pages that u posted. If you Know the P89C51RD2 mcu very well do you think that the relocatable module is possible? Do the 'udata' and 'res' directives work as in the pics? is there a concept of linker script in the 80c51 family?

fasile

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Ajay

Sun May 20 2007, 02:28PM

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well.. u can make use of like IDATA and XDATA also the derivatives like _at_ for giving fixed address to a variable. these things can be done in Keil.
also.. you can make use of linker script. there are many things you can do with keil.

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fasil

Sun May 20 2007, 04:05PM

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do you have a live link for the book
The 8051 Microcontroller
by - I. Scott MacKenzie or
The 8051 Microcontroller
by - James W. Stewart

fasile

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Ajay

Sun May 20 2007, 10:11PM

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check in the ebook forum->8051
i dont think the book are asking is there but there is another book, C and 8051 its a good book. try that and if you want any book then see the request a book forum.

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fasil

Mon Jun 04 2007, 02:31AM

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i have been converting the code but i couldn't find a replacement for the function of PCLATH register in the pic .what can i do to replace the functions of PCLATH,PCL and PCH?

fasile

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Ajay

Mon Jun 04 2007, 04:01AM

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Fasil, i donno much about PIC microcontroller and there is no site which explains these register. I am really surprised on this thing. well i got found some information... like this..

PC:
Program counter (PC) is a 13-bit register that contains the address of the instruction being executed. It is physically carried out as a combination of a 5-bit register PCLATH for the five higher bits of the address, and the 8-bit register PCL for the lower 8 bits of the address.

I dont know how much you understood from that... but i saw sample programs etc.. which shows that, PCL and PCLATH is used for making lookup tables, as PCL is directly associated with the program counter and in 8051 there is no direct access to PC.
also.. these two registers are used for making jumps etc.. like jump to some address, but usually as i said PCL and PCLATH is used for look up tables. coz normal jumps in PIC i.e. goto and call etc. are limited to some limit of memory (sorry donno much about this)
but in 8051 we can directly jump to the label with ljmp. Please try to read more in PIC books if you can get some information and do share it with me.
and regarding your use of register.. i think you can try using DPTR, labels and jumps hope you get desired result.

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