Port bit manipulation useing variables

[shawn]

Hello,
I Am writing a Modbus RTU program to talk with an ILon 100 internet Server. I am trying to streamline my code. I am using modbus single coil write function to write the value of PortB single bit values. The program below works but is there a better way than Case Select. When I say better I mean less code and faster. This is not the whole code but is the jist of the Case Select.

WriteSingleCoil:
W0 = buffer[3]*255 + buffer[4]      'Combines MFrame 2 byte address into 1 word.
W0 = w0 - 10                                'Sets up bit address for portB
If buffer[5] > 0 Then
    Coilstate = 1
else
    Coilstate = 0
endif
Select Case W0
    Case 1
        PORTB.0 = Coilstate
    Case 2
        PORTB.1 = Coilstate
    case 3
        PORTB.2 = Coilstate
    case 4
        PORTB.3 = Coilstate
    case 5
        PORTB.4 = Coilstate
    case 6
        PORTB.5 = Coilstate
    case 7
        PORTB.6 = Coilstate 
    Case 8
        PORTB.7 = Coilstate
    Case else              'test to see if program is getting here
        portb = 255
End Select
For B0 = 1 To 8                        ' Send the response to Master
    B1 = buffer[B0]
    Gosub charout
Next B
Return

Is there a way to do something like this.


PortB.w0 = Coilstate

I tryed this but it does not work. I'm going to try to use an aliass next but Im not sure if thats a good choice either.
Thanks
Nick

[aratti]

Is there a way to do something like this.
PortB.w0 = Coilstate

Yes

PortB.0[W0] = Coilstate


Cheers

Al.

[shawn]

Hey
Thanks for your answer but I don't completly follow.

PortB.0[W0] = Coilstate

What is the .0 for.
I want to do something like this.

PortB.[W0] = Coilstate

But It does not compile.
Where W0 is the pin or bit of port B to change.

Thanks
Nick

[aratti]

Nick, PortB.0[W0] = Coilstate is a workaround to obtain PortB.[W0] = Coilstate and have the code compiling.

Cheers

Al.

[shawn]

Thanks Al, that worked