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How to Pull ups port c

 
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karthickiw



Joined: 09 Aug 2007
Posts: 82
Location: TN, India

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How to Pull ups port c
PostPosted: Tue Dec 15, 2009 7:12 am     Reply with quote
Dear CCS Friends,


In my project I used 5 x6 matrix keypad. For that I take some sample code from CCS forum. In this program, the program has pull_ups on the row pins like port_b_pullups(TRUE);. In my project I connect the 3 rows connected in portB, one row in portD.2 and other row one in portC.2. I'm also using Pullups for the three ports like below:
Code:

port_B_pullups(TRUE);
port_D_pullups(TRUE);
port_C_pullups(TRUE);

When I compile the program, compiler show error on port_C_pullups(TRUE); line. Compiler error is undefine variable. I remove the port_C_pullups(TRUE); line and compile the program and load the program in hardware. When I touch the pin C.2. I received the equal key char in my system.

How to do Pullups on Port c?
Ttelmah
Guest
PostPosted: Tue Dec 15, 2009 10:18 am     Reply with quote
Read the data sheet.
Does the PIC you are using offer pullups on PortC?.
Most don't (can't think of any that do...).
Hence the error.

Best Wishes
rnielsen



Joined: 23 Sep 2003
Posts: 852
Location: Utah

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PostPosted: Tue Dec 15, 2009 10:32 am     Reply with quote
If the hardware is not there, NO amount of software will make it work. If the PIC does not have internal pullups inside there is no way to enable them. Read the spec. sheet and see what hardware is inside.

Ronald
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