#include

$/**************************************************************$

$**$ Author: Ronald Kikoyo

$*$

$*$ Program Title: $-$ Flashing a LED

$*$

$*$ Program File Name:

$*$

$*$ Microprocessor B

$*$

$*$Spring

$*$

$*$

$***************************************************************/$

void delay$\_20$ms$($void$)$

$\{$

const int D$20$ms $=1150$; $//$ Declare a Constant for $20$ ms Delay

int i;

for $($i $=0$; i $<$ D$20$ms; i$++)$;

return;

$\}$

void PIO$\_$Config$($void$)$; $//$prototype

void

Second$\_$Timer$2\_$Config$($void$)$;

$//$ PIC$24$HJ$32$GP$202$ Configuration Bit Settings

$//$ FBS

#pragma config BWRP $=$ WRPROTECT$\_$OFF $//$ Boot Segment Write Protect $($Boot Segment may be written$)$

#pragma config BSS $=$ NO$\_$FLASH $//$ Boot Segment Program Flash Code Protection $($No Boot program Flash segment$)$

$//$ FGS

#pragma config GWRP $=$ OFF $//$ General Code Segment Write Protect $($User program memory is not write$-$protected$)$

#pragma config GSS $=$ OFF $//$ General Segment Code Protection $($User program memory is not code$-$protected$)$

$//$ FOSCSEL

#pragma config FNOSC $=$ FRC $//$ Oscillator Mode $($Internal Fast RC $($FRC$))$

#pragma config IESO $=$ OFF $//$ Internal External Switch Over Mode $($Start$-$up device with user$-$selected oscillator source$)$

$//$ FOSC

#pragma config POSCMD $=$ NONE $//$ Primary Oscillator Source $($Primary Oscillator Disabled$)$

#pragma config OSCIOFNC $=$ ON $//$ OSC$2$ Pin Function $($OSC$2$ pin has digital I$/$O function$)$

#pragma config IOL$1$WAY $=$ OFF $//$ Peripheral Pin Select Configuration $($Allow Multiple Re$-$configurations$)$

#pragma config FCKSM $=$ CSDCMD $//$ Clock Switching and Monitor $($Both Clock Switching and Fail$-$Safe Clock Monitor are disabled$)$

$//$ FWDT

#pragma config WDTPOST $=$ PS$512//$ Watchdog Timer Postscaler $(1$:$512)$

#pragma config WDTPRE $=$ PR$128//$ WDT Prescaler $(1$:$128)$

#pragma config WINDIS $=$ OFF $//$ Watchdog Timer Window $($Watchdog Timer in Non$-$Window mode$)$

#pragma config FWDTEN $=$ OFF $//$ Watchdog Timer Enable $($Watchdog timer enabled$/$disabled by user software$)$

$//$ FPOR

#pragma config FPWRT $=$ PWR$16//$ POR Timer Value $(16$ms$)$

#pragma config ALTI$2$C $=$ OFF $//$ Alternate I$2$C pins $($I$2$C mapped to SDA$1/$SCL$1$ pins$)$

$//$ FICD

#pragma config ICS $=$ PGD$1//$ Comm Channel Select $($Communicate on PGC$1/$EMUC$1$ and PGD$1/$EMUD$1)$

#pragma config JTAGEN $=$ OFF $//$ JTAG Port Enable $($JTAG is Disabled$)$

$/**************$ END $---$ Configuration Word $*********************/$

int i$,$ j$,$ k;

int main$()$

$\{$

k $=1$ ;$//$start from LED$1$

for $($i $=0$;i$<255$;i$++)$

for $($j $=0$; j $<129$;j$++)$;

PIO$\_$Config$()$;

Second$\_$Timer$2\_$Config$()$;

switch $($k$)$

while$(1)//$ Loop Forever

$\{$

T$2$CONbits.TON $=1$; $//$ Start $32-$bit Timer

while$(0==\_$RB$13)//$switch

while$($IFS$0$bits.T$3$IF $==0)$;

delay$\_20$ms$()$;

case $1$:

$\_$LATB$14=\_$LATB$14^1$; $//$Toggle LED

break;

delay$\_20$ms$()$;

case $2$:

$\_$LATB$13=\_$LATB$13^1$; $//$Toggle LED

break;

delay$\_20$ms$()$;

case $3$:

$\_$LATB$15=\_$LATB$15^1$; $//$Toggle LED

break;

delay$\_20$ms$()$;

case $4$:

$\_$LATB$12=\_$LATB$12^1$; $//$Toggle LED

break;

delay$\_20$ms$()$;

case $5$ :

$\_$LATB$11=\_$LATB$11^1$; $//$Toggle LED

break;

delay$\_20$ms$()$;

case $6$:

$\_$LATB$10=\_$LATB$10^1$; $//$Toggle LED

break;

delay$\_20$ms$()$;

case $7$:

$\_$LATB$2=\_$LATB$2^1$; $//$Toggle LED

break;

IFS$0$bits.T$3$IF $=0$;

$\}$

k $=($k $+0)\%8$;$//$increment

$//***$ END OF While $(1==1)$ LOOP

$\}$

$/********$ END OF main ROUTINE $***************************/$

$/*************32$bit Timer ISR $***************************************/$

void $\_\_$attribute$\_\_((\_\_$interrupt$\_\_,$ no$\_$auto$\_$psv$))\_$T$3$Interrupt$($void$)$

$\{$

int flag $=0$ ;

if $($ flag $==0)$

$\{$

LATBbits.LATB$2=1$;

$\}$

else

$\{$

if $($ flag $==1)$

$\{$

LATBbits.LATB$2=0$;

$\}$

flag $=$ flag $^1$; $//$ Toggle flag

$\_$T$3$IF $=0$; $//$ clear the interrupt flag

$\}$

$\}$

$/********************************************************************/$

void PIO$\_$Config$($void$)$

$\{$

$/************$ PIO config $***********/$

$//$RB$13--$ configure as a low true op with internal pull$-$up enabled

$\_$ODCB$13=0$; $//$ Disable open drain

$\_$TRISB$13=0$; $//$ Config RB$13$ as input

$\_$PCFG$11=1$; $//$ Config RB$13($AN$11)$ for digital mode

$\_$CN$13$PUE $=1$; $//$ Enable pull$-$up on RB$13$

$\_$ODCB$14=0$; $//$ Disable open drain

$\_$TRISB$14=0$; $//$ Config RB$14$ as output

$\_$PCFG$10=1$; $//$ Config RB$14($AN$10)$ for digital mode

$\_$LATB$14=0$; $//$ RB$14$ initial condition: low

$\_$ODCB$15=0$; $//$ Disable open drain

$\_$TRISB$15=0$ ; $//$ Config RB$15$ as input

$\_$LATB$15$

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