Glad I could help.

Bob

On Wed, Sep 16, 2015, at 07:09 PM, Richard R. Pope wrote:
> Bob,
>      I appreciate this. It is exactly what I am looking for. It is=20
> straight forward and simple. Otherwise it fulfills the KISS principle.=20
> It compiles with no errors. I still have to do the code for the B port.
> Thanks,
> rich!
>=20
> On 9/16/2015 8:52 PM, Bob Blick wrote:
> > Hi Rich,
> >
> > There are a couple of ways you could do this. One would be to use array=
s
> > to decode the inputs. It would probably be efficient. The second would
> > be to use a switch-case statement. It is more versatile. If you decide
> > to add more features, it'll come in handy. So that's what I'll do here
> > for your Port A question, you can duplicate this for Port B and change
> > it as necessary.
> >
> > void decodePortA(void)
> > {
> > unsigned char portashadow =3D PORTA & 0xC3;  // zero out the bits we wr=
ite
> > later
> >    // If you are driving port A during interrupts, disable interrupts
> >    here
> >    switch (PORTA & 0x03)  // only working with bits 0 and 1
> >      {
> >        case 0:
> >          portashadow |=3D 0x24;  // output bits 2 and 5
> >          break;
> >        case 1:
> >          portashadow |=3D 0x08;  // output bit 3
> >          break;
> >        case 2:
> >          portashadow |=3D 0x10;  // output bit 4
> >          break;
> >        case 3:
> >          portashadow |=3D 0x20;  // output bit 5
> >          break;
> >        }
> >        PORTA =3D portashadow;  // write the decoded pattern to the port
> >        // If you disabled interrupts earlier, re-enable them here
> > }
> >
> > Sorry if formatting isn't great, using email editor.
> >
> > Using switch-case takes more steps, but it's real clear what you are
> > doing, and you can do completely different things or additional steps
> > for any case.
> >
> > Hope this helps.  I haven't used XC8 but this should be portable. If I
> > made errors, sorry, I'm sleepy :(
> >
> > Best regards, Bob
> >
> > On Sat, Sep 12, 2015, at 09:49 AM, Richard R. Pope wrote:
> >> Hello all,
> >>       I solved this problem. Some how I managed to delete everything i=
n
> >> the XC8 include files. I reinstalled XC8 and that fixed it. Dumb!! Now=
 I
> >> have another problem. The code is running and most of it works
> >> correctly. This is about as simple as it gets. I am using a series of =
if
> >> and elseif statements to check for the setting of two input bits and
> >> then set four output bits. It is PortA and B and the input bits are 0
> >> and 1. The two ports control two separate devices. If the setting is 0=
,
> >> 0 then output bits 2 and 5 are on and bits 3 and 4 are off. If the
> >> setting is 0, 1 then bit 2, 4, and 5 are off and bit 3 is on. If the
> >> setting is 1, 0 then bits 2, 3, and 5 are off and bit 4 is on. If the
> >> setting is 1, 1 then bits 2, 3, and 4 are off and bit 5 is on. That is
> >> the way it is supposed to work. So here are three tables showing what =
is
> >> supposed to happen and what is happening;
> >>                               Supposed to be!                 The way =
it
> >> is!   Port A      The way it is!   Port B
> >> --------------------------------- ----------------------------------
> >> ----------------------------------
> >>                   |    Input    |    Output                 |
> >>           |    Input    |    Output |     | Input    |    Output     |
> >>                   |   Bits       |    Bits                      |
> >>                     |    Bits      |    Bits       | |    Bits      |
> >> Bits                        |
> >>                   |-----|-----|-----|-----|-----|-----|
> >> |-----|-----|-----|-----|-----|------|
> >> |-----|-----|-----|-----|-----|------|
> >>                   |   1  |   0   |   2   |   3  |   4  |   6   | 5 for
> >> B          |   1   |   0  |   2   |   3  |   4   |   6 |     |   1 |
> >> 0  |   2  |   3   |   4   |   5   |
> >>                   |-----|-----|-----|-----|-----|-----|
> >> |-----|-----|-----|-----|-----|------|
> >> |-----|-----|-----|-----|------|-----|
> >>                   |   0   |   0  |  1   |   0   |   0   |   1  |
> >>                   |   0  |    0  |   1   |   0  |    0  | 1   |    OK
> >>        |   0  |   0   |   1  |   0   |   0    | 1  |        OK
> >>                   |-----|-----|-----|-----|-----|-----|
> >> |-----|-----|-----|-----|------|-----|
> >> |-----|-----|-----|-----|------|-----|
> >>                   |   0   |  1   |  0   |   1   |   0   |   0 |
> >>                   |   0  |    1  |   0  |   1   |    0 |   0  |     OK
> >>           |   0  |   1   |  1* |   0   |   0 |   1*|        Bad*
> >>                   |-----|-----|-----|-----|-----|-----|
> >> |-----|-----|-----|-----|------|-----|
> >> |-----|-----|-----|-----|------|-----|
> >>                   |   1   |   0  |   0  |   0   |   1   |   0  |
> >>                |   1   |   0  |   0  |   0   |  1*   |   0   |     OK*
> >>       |   1  |   0   |   0  |    0  |    1   |   0 |        OK
> >>                   |-----|-----|-----|-----|-----|-----|
> >> |-----|-----|-----|-----|------|-----|
> >> |-----|-----|-----|-----|------|-----|
> >>                   |   1  |   1   |   0   |   0  |   0   |   1 |
> >>                   |   1  |    1  |   0   |   0  |    0 |   1   |    OK
> >>        |   1  |    1  |   0  |    1  |    0 |   0  |        Bad
> >>                   |-----|-----|-----|-----|-----|-----|
> >> |-----|-----|-----|-----|------|-----|
> >> |-----|-----|-----|-----|------|-----|

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