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sbit ptr? (best method for port and bit identification)

Bahri Okuroglu

Dear all,

My board will have several inputs connected to P0-P3. The PC will instruct the microcontroller using RS232, to monitor some of the inputs.

The communication between the PC and the 8051 will be somewhat like below:

PC->8051: 
   count the state changes on P0.3
   count the state changes on P0.6
                :
                :
   inform me on any change of the state of P1.5
   inform me on any change of the state of P3.4
                :
                :

This way, I'm trying to build a generic data acquision board which will be configured by the PC.

However, not to use a "case" statement for every bit of every port on the microcontroller, it should use somewhat like sbit pointer.

Is this possible?

Or what is the best way to find which bit of the which port to listen, using the information of [x, y] provided by PC (where x is the port number, and y is the bit offset in the port).

Regards,

Parents
  • 0 in reply to Bahri Okuroglu

    Ahhh. If you pass the Port information to a program that is already compiled and linked then you must do something like the switch statement.

    I seem to recall that someone did something similar but either they use von Neuman RAM and wrote the instruction to XDATA (and executed it from CODE) or created an assembly switch that was really efficient.

    Jon

Reply
  • 0 in reply to Bahri Okuroglu

    Ahhh. If you pass the Port information to a program that is already compiled and linked then you must do something like the switch statement.

    I seem to recall that someone did something similar but either they use von Neuman RAM and wrote the instruction to XDATA (and executed it from CODE) or created an assembly switch that was really efficient.

    Jon

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