P0 User Manual

8/13/2019 P0 User Manual

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PROJECT 0My 1st IC ROJECT, LOAD A SIM LE LED BLINKIn this project, we are going to do a simple LEDs

blinking using the LEDs on SK40C In here, we are

using both o! the LEDs and blink it like a police car

"esides on learning electronic parts, #ou will also

learn about some coding in C using $I%&EC$ C in

'(L)"

COM ONENT NEEDED

LEDs *+ SK40C

CONNECTIONor this project, the LEDs was alread# connected to

the pins -"./(*-&". and -"1/(*-&"1 So, #ou

ma# onl# ha2e to con!igure the I3* pins as an output

in programming part &o program the (IC.551,

connect the 6IC00" to the ICS( (rogrammer 'ake

sure the power connection is correct and *+ !or

SK40C *pen '(L)" and include the (roject70c and

click to compile and build $E8 !ile )!ter 9"uildSuccess!ul:, the (ICKit; should automaticall# run and

program the $E8 !ile into (IC.551 inall#, the

LED and LED; will be blink like the police car

CODE OVERVIEWConfiguration for PIC16F887

igure below shows the Con!iguration !or (IC.551

&he code abo2e can be !ound at the Con!iguration

bits /C*+ID&DIS >atchdog &imer Disable

(>-&E+ (ower 6p &imer Enable

"*-DIS "rown *ut -eset Disable

'CL-E+ 'CL- unction Enabled

L?(DIS Low ?oltage (rogramming Disable
http://ww1.microchip.com/downloads/en/DeviceDoc/41291D.pdfhttp://ww1.microchip.com/downloads/en/DeviceDoc/41291D.pdfhttp://ww1.microchip.com/downloads/en/DeviceDoc/41291D.pdf


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system.h

@de!ine78&)L7-EA ;0000000"esides that, same step b# @de!ine the cr#stal

!reBuenc#/78&)L7-EA according to #our e=ternal

cr#stal !reBuenc# using In here, the de!ault e=ternal

cr#stal !reBuenc# using are ;0000000 /;0'$

@de!ineS> -"0

In here, we ha2e alread# de!ine the switch on SK40C

board as -"0 6ser are no need to de!ine again in the

main coding

@de!ineLED -".

In !igure abo2e, using the code @de!ine, we can

replace the -". and -"1 as LED and LED; "# doing

this, we can easil# remember and the I3* port we are

using

@de!ine LCD7E -"

@de!ine LCD7-S -"4

@de!ine LCD D)&) (*-&D

"esides that, user are not reBuired again to de!ine

the LCD pin !or SK40C 6ser onl# reBuired to include

the s#stemh !ile urther detail on LCD please re!er

to (roject7;

@de!ine &8 -C.

@de!ine-8 -C1

6ser are not reBuired again to de!ine the serial

comunication /6)-& pin !or SK40C 6ser onl#

reBuired to include the s#stemh !ile urther detail

on 6)-& please re!er to (roject7

2oid dela#7ms/unsigned intui72alueF

unction protot#pe is the declaration o! a !unction

that omits the !unction bod# but does speci!# the

!unctionGs name, arit#, argument t#pes and return

t#pe &he s#mbol 9 F : should put at the end o! thisline

MAIN PROGRAM

2oidmain /2oid

In !igure abo2e is the main program stwe ha2e to

t#pe 92oid main/2oid: at the st line to tell the

micro%controller that this is the starting point o! the

program

$ere, 2oidmain, tell the compiler the name o! the

!unctin which is main and it donGt return an#

data/2oid

(*-&) H 0F

Clear the (*-& to pre2ent !rom the data latch on the

(IC 'C6

&-IS) H0b00000000F

is the &ri%S&)&E -egister that declare the I3* ports asan I+(6& or *6&(6& b# /HI+(6& and /0H*6&(6&

Eg &-IS" H 0b0000 is to set the (*-&"1J4 to

*6&(6& and (*-&J0 as I+(6&

LED H 0F

&hen, we make the LED o!! b# gi2ing it a 0at initial

state as show abo2e So as the LED; too &o make it

on, just change the 0to


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while/

&o make the program loop !ore2er, we use while/

!unction whileconstruct consists o! a block o! code

and a condition &he condition is e2aluated, and i!

the condition is true, the code within the block is

e=ecuted In here, we put / to indicated that the

condition is true

dela#7ms/00F

is a !unction call is an e=pression containing a simple

t#pe name and a parenthesied argument list &he

argument list can contain an# number o! e=pression

separated b# commas It can also be empt# In here,

we put the arguments list as 00 which is 00ms

Comment line //

In the code, we can !ound the //on the right hand

side o! the code &he //is simpl# a comment in the

code and is ignore b# the compiler )n# code that

behind the//is ignore b# compiler and is just simpl#

there !or #ou, or e2er#one to reads the code

Comments are essential in the code to help #ou to

better understanding on what going on and how the

code works Comments can be put a!ter the

command as in the ne=t line o! the program

*n the other hand, #ou can also put comments into

the block statement b# using /*and */

EgJ

3 )ll the code within the slash and

asterisks will be ignore b# compiler 3

2oiddela#7ms/unsigned intui72alue

is an !unction that will be call and per!orm in the

main !unction 92oid dela#7ms:, here we are telling

the compiler that out !unction is name dela#7ms and

it donGt return an# data /2oid

/unsigned intui72alue

is the parameter use to insert 2alue depending to our

reBuirement 9int: mean integer which the minimum

allow range are between %;1.1 to M;1.1/; "#tes

9unsigned int: mean that the data we can insert is

between 0 to . &here are man#data t#pethatwe can assign and use that act as the temporar#

space !or micro%controller to store the data

while/ui72alue%% 0

in this condition, i! the ui72alue is subtract b# one at

the time and check i! the ui72alue isGt still greater

then 0 &he code within the while loop will be

running !or man# times until the ui72alue is less then

0

77dela#7ms/F

&his is the macro !rom $I%&EC$ complier which will

generate ms dela# base on 2alue o! 78&)L7-EA
http://en.wikipedia.org/wiki/C_variable_types_and_declarationshttp://en.wikipedia.org/wiki/C_variable_types_and_declarationshttp://en.wikipedia.org/wiki/C_variable_types_and_declarationshttp://en.wikipedia.org/wiki/C_variable_types_and_declarations

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