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!

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 arrays
> 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 writ=
e
> 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 in
>> 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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