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Hi, I have been working on a project which requires interfacing a keypad and a LCD to 8051 microcontroller using keil software. New to the languge, i am unsure how to resolve a C202 error, error statement being PIN_D3:unidentified identifier. Please help
The first rule is not to manually re-type or paraphrase the message - use copy & paste so that we can see the complete, exact message.
Note that the complete message includes the exact location at which the error was detected:
http://www.keil.com/support/man/docs/c51/c51_er_errorwarn.htm
And remember that we can't see your code - so you also need to copy & paste the code that it relates to.
Remember to follow the instructions for posting source code: www.danlhenry.com/.../keil_code.png
"New to the language"
It's generally best to learn the language on a PC - where you are spared all the added complications of small microcontrollers! This is particularly true for the 8051 - which has some very arcane (one might also say archaic) features...
Here are some 'C' learning & reference materials for you: blog.antronics.co.uk/.../
... here: http://www.keil.com/forum/63985