I got a question about PIC 16F877 set up analog to digital.

[Brian]

Hello everyone,

I got a question about setup_adc_ports.

In the PIC 16F877, the port A and E are analog. I just need to set it up on PIN A0_A1_A2. and PIN E0_E1.

I used the command " setup_adc_ports(A0_A1_A2_ANALOG);"
and "setup_adc_ports(E0_E1_ANALOG);"

but it showed that "Undefined identifier A0_A1_A2_ANALOG"
and "Undefined identifier RE0_RE1_ANALOG"

I do not know what's wrong.

Any help will be appreciated.

Thank you very much.



Sincerely,



Brian

[PCM programmer]

Look in your 16F877.h file. It has the list of constants that may be used
with setup_adc_ports() function. Here is the file location:

[Brian]

Hello PCM programmer,

I have already taken a look the pic16f877.h. I just need A0_A1_A2 and E0_E1 but it does not have this choice.
What is the mean "A0 A1 A5 E0 VRefh=A3 VRefl=A2"? I have no idea what reference means. What is the purpose?

Thank you so much.
Sincerely,
Brian

[PCM programmer]

[Brian]

Hello PCM programmer,

Thank you for your reply.
I understood now.
Thank you so much,

Sincerely,

Brian

[PCM programmer]

If you are in the US or nearby, you can get the 16F887 (in DIP-40
package) for $2.64 + shipping from http://www.mouser.com
There is no minimum order. Part number: 579-PIC16F887-I/P

Or, possibly you can order a free sample from Microchip, but it might
not ship immediately.