Richard,


In this PIC for the analog inputs to be off, you must write 0x06 or 0x07
to ADCON1, not 0x00.


Cheers,

Isaac


Em 20/10/2015 10:15, Richard R. Pope escreveu:
> Issac,
>      Nicola pointed this out and I changed CMCON from 0 to 7. There is=20
> still no activity on the en or r/s pins. Any more thoughts.
> Thanks,
> rich!
>
> On 10/20/2015 7:05 AM, Isaac Marino Bavaresco wrote:
>> Richard,
>>
>>
>> Did you turn off the analog comparators?
>> If not, do that with CMCON =3D 7;
>>
>> If the comparators are not disabled, RA0 through RA3 become analog and
>> they are read always as '0'.
>> That would create RMW problem if you change each bit individually,
>> because this PIC doesn't have LAT register.
>>
>>
>> Cheers,
>>
>> Isaac
>>
>>
>> Em 20/10/2015 09:36, Richard R. Pope escreveu:
>>> Issac,
>>>       The problem is going to be in the configuration of the 16f877a.
>>> There is no activity on the en or the r/s pins. Argh! I thought that
>>> this might be the problem. The clock is running. I have every reason to
>>> believe that the pins are not set for digital I/O. Here is the setup
>>> statements:
>>>           TRISD =3D 0;
>>>           TRISA =3D 0;
>>>           ADCON0 =3D 0;
>>>           ADCON1 =3D 0;
>>>           CMCON =3D 0;
>>> Any more thoughts on this?
>>> Thanks,
>>> rich!
>>>
>>> On 10/20/2015 6:04 AM, Isaac Marino Bavaresco wrote:
>>>> Richard,
>>>>
>>>>
>>>> You could create an infinite loop sending just one and the same comman=
d
>>>> to the LCD, then your scope would synch with, say, the ENABLE signal a=
nd
>>>> keep the image steady.
>>>>
>>>>
>>>> Isaac
>>>>
>>>>
>>>> Em 20/10/2015 07:31, Richard R. Pope escreveu:

--=20
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