Zilog Microcontroller Programming 101
Tuesday, November 27, 2012
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ZILOG 101
PART 1
Prepared by: Posadas, Glenn Von C.
Language of
this post: Tagalog & English.
If you find
this and you do not understand Tagalog, wait for my full-english post. Just
Subscribe to my blog.
Okay, so I
was hesitating lately. Saan ba mas maganda? Sa Powerpoint o sa Word? Kasi kung
sa Word ko ito ilalagay, pwede ko ito mailagay sa website ko.
Anyways, I
won’t and I can’t teach you how to exactly install the basic drivers and IDEs
necessary for the Zilog ha? Wala akong microcontroller module dito. I use
arduino for my projects at sa 5th year ko pa yang Zilog. So baka sa
summer na ako bumalik diyan.
HERE ARE THE THINGS YOU ARE REQUIRED
TO DOWNLOAD AND INSTALL:
Basically,
all programming ang maituturo ko ditto. So let us begin.
THE C PROGRAMMING LANGUAGE
BASICS
I bet medyo
naaalala nyo pa ang unang una nyong programming language na C.
Example
program. This will compile and display: “I love you”. By the way, don’t waste
your time by running it. Quotations here in MS Word may confuse the compiler.
#include
#include
Int main(void)
{
printf(“I love you”);
getch();
}
EXPLANATION:
Yung
katabi ng mga nasa #include, yan yung tinatawag na headers. Kaya nga may .h na
nakalagay. Basically #include is a function that will include files, such as
your headers or your other files. Kunwari, #include
“this_is_my_second_function.c”
Now,
what is the difference between “ “ and < > ? The quotation tells the
reader that these are your own files. < > indicates, on the other hand
that the file is in the compiler itself.
The
int main(void) { } is our main function. Later on, I will show you how to make
your own function such as delay.
VARIABLES & VARIABLE
DECLARATIONS
Variables are used to store different types
of data. Kumbaga sa Assembly Low level Programming language, ito ay isang
registers. Parang sa microprocessor. Anyway, there are two types of variables
(there are the two ways of declaring your variables inside your program.
1. GLOBAL VARIABLES
2. LOCAL VARIABLES
Now, ano anman ang pinagkaiba nitong dalawang
ito? Ewan ko. Joke.
Global Variables – ito yung mga variables na
nasa taas ng ating mga mga functions. Usually nasa itaas ng main function. Pero
ang pinakamabisang pageexplain kung pano masasabi na ang isang variable ay
globally declared ay sa pamamagitan ng pagtingin kung ito ay nasa ilalim ng mga
headers. Magulo ba? Tsss.
Local Variables – ito yung mga variables na
nasa loob ng isang certain functions.
Note that all local variables are merely
accessible inside your function where it is declared. While the global
variable, on the other hand, can be accessed by any of your functions anytime.
So, hindi ko na ieexplain yung “;” at yung
mga uri ng DATA TYPES ha? Pero sige, konti lang. “;” ito ay yung tinawag kong
TERMINATOR noong 2nd year college ako na nauso naman sa buong klase
at until now ginagamit ng mga kakalse ko. Hindi ko talaga alam kung ano ang
official na tawag dyan sa programming, basta ang term ko dyan ay terminator.
EXAMPLES OF DATA
TYPES: float, int, bool, etc…
MACRO DEFINITIONS
Let us go to macro function for awhile. I
learned this one when I was in 2nd year ulit. Hehehe. Effective ito
lalo na kapag may exam ka at gusto mong mauna magpacheck. XD. Ito ay gamit sa pagpapaikli at pagdeclare ng CONSTANTS.
Macros are
defined by the #define directive
Examples:
//this
allows NUMBER to represent 3
#define
NUMBER 3
//this
allows SHOW to represent the printf() instruction
#define SHOW
printf(“Hello World!”);
Commonly used data types
char(8 bits)
int (16 bits)
float (32 bits)
Array – a group of elements
having the same data type
Example: char string[100] – an array
named “string”
composed of 101 characters (from string[0] to
string[100])
Variable
Declarations
Variables are declared by the data type
and variable name
if you want to continue reading this, download this full pdf file:
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Labels:
Microcontroller,
Programming,
z8 Encore,
Zilog
