分亨一PIC12F675程序驱动LED
/*
/*
/*-------------------- FUNCTIONAL DESCRIPTION -------------------------------
// GENERAL:
// DESCRIPTION: (DEMO VERSION )
// THIS PROGRAM GENERATES A 200Hz PWM DIMMING SIGNAL FOR A LDD-1000
// LED DRIVER. THE BRIGHTNESS (PWM) IS PROGRAMMABLE FROM 0 to 100%.
// THE SUNDWN TRIP POINT IS DETERMINED BY A RESISTOR VALUE. THERE IS A
// LOGIC INPUT FROM AN AC LINE DETECTOR (LOW= AC, HIGH= NO AC). IF THE AC
// IS OFF AND IT IS SUNDOWN. THE BACKUP LIGHT TURNS ON FOR 1 MINUTE.
// IF THE AC STAYS OFF FOR MORE THAN 1 MINUTE, THE LIGHT WILL TURN OFF.
// AT THIS POINT THE CONTROLLER ENTERS A 5 MINUTE WAITING PERIOD. DURING
// THIS TIME, THE LIGHT WILL BLINK ONCE EVERY 10 SECONDS UNTIL THE END OF
// THE TIMEOUT PERIOD. AFTER 5 MINUTES THE CONTROLLER RECHECKS THE AC AND
// SUNDOWN AND RESPONDS NORMALLY. IF THE AC RETURNS OR THE SUN COMES UP
// WHILE THE LIGHT IS ON OR IN TIMEOUT, THE LIGHT TURNS OFF AND THE
// CONTROLLER RETURNS TO NORMAL MODE.
//
// CONNECTIONS:
// J0 (PROGRAM):
// P1 (VPP): 12V PROGRAM 5V PULLUP
// P2 (GND):
// P3 (PGC): PROGRAM CLOCK
// P4 (N.C.):
// P5 (PGD: PROGRAM DAATA
// P6 (VDD): +5V
//
// J1 (10VDC TO 30VDC)(NOM=24V):
// P1 (V+): POWER IN
// P2 (GND): POWER COMMON
//
// J2 (CDS PHOTOCELL INPUT):
// P1 (+5V): CURRENT LIMITED +5V
// P2 (CDS): CURRENT FROM CDS CELL
//
// J3 (AC DETECT)(90VAC TO 240VAC):
// P1 (AC IN): 47K PULLUP TO +5V (GND WHEN AC ON)
// P2 (COMM): SWITCHED COMMON
//
// J4 (POWER TO BACKUP LIGHT):
// P1 (LED+): DIODE DECOUPLED CONSTANT CURRENT
// P2 (LED-): ISOLATED GND
//
//
/*----------------------- REVISION HISTORY ----------------------------------
/*
/* File:
/* Software rev#: 0
/* PCB rev#: 0
/* Date:
/* By:
/* Description:
/*
/*
/*------------------- INCLUDES AND PIC SETTINGS -----------------------------
*/
#case
#include <12F675.h> // PIC 12F675
#device adc=10
#fuses NOWDT // No Watch Dog Timer
#fuses INTRC_IO // Internal RC Clock (4.0 Mhz)
#fuses PROTECT // Code Protect from Reads
#fuses BROWNOUT // Brownout reset Enabled
#fuses NOMCLR // Master Clear Disabled
#fuses NOCPD // No EE Rom Protect
#fuses PUT // Power On Timer Enabled
#use delay(clock=4000000) /* 4.0 Mhz Clock selected
/-------- PIC Pin Definitions --------
/* PIN1 =VDD (+5V) (POWER)
/* PIN2 =A5 (PWM TO LDD-1000) (PWM)
/* PIN3 =A4 (NOT USED)
/* PIN4 =VPP (ICSP PGM VOLTAGE) (VPP)
/* PIN5 =A2 (NOT USED)
/* PIN6 =PGC/A1 (ICSP CLK,CDS SUN UP) (sun) (IN) (0= SUN DOWN)
/* PIN7 =PGD/A0 (ICSP DATA, AC ON INPUT) (ac) (IN) (0= AC ON)
/* PIN8 =VSS (GND)
*/
// --------- DEFINE PORTS ----------
#define bright 5 // BRIGHTNESS POT (VR2) ADDRESS (NOT USED)
#define sundn 3 // DUNDOWN POT (VR1) ADDRESS (NOT USED)
#define sun PIN_A1 // CDS CELL INPUT ADDRESS
#define ac PIN_A0 // AC DETECT ADDEESS
#define PWM PIN_A5 // PWN TO LD-1000 LED DRIVER (0%= OFF, 100%= MAX)
// ---------- CONSTANTS ----------
const int ints_sec=15; // seconds calibrate for timer ISR
const float vr1cal=11; // ADC calibration value for sundown (1-100)
const float vr2cal=11; // ADC calibration value for brightness (1-100)
const long timeout1=1; // first timeout(MINUTES)
const long timeout2=5; // second timeout (MINUTES)
// ---------- GLOBAL VARIABLES ----------
long count1=ints_sec; // decrement counter for timer ISR
long seconds=0; // seconds counter
long minutes=0; // minutes counter
long hours=0; // hours counter
long tic=0; // seconds count down timer
long brightness=50; // Brightness value for PWM (0 - 100)
long sundown=0; // Sundown value for dcs (0 - 100)
short acon=0; // AC detect flag (0= NO AC, 1= AC ON)
short sunflg=0; // Sun flag, (0= sun down, 1 = sun up)
long period=5000; // pwm period in microseconds (200Hz)
long ontime=0; // PWM on time (MILLISECONDS)
long offtime=0; // PWN off time (MILLISECONDS)
long blinktime=5; // time between blinks (seconds)
//---------- INTERRUPT ROUTINES ----------
#int_TIMER1
voidTIMER1_isr(void)
{
--count1; // decrement the counter
if (count1<=0)
{
count1=ints_sec; // reload counter
seconds++; // increment seconds
tic--; // decrement count down timer
if (tic<0)
tic=0;
}
if (seconds>=60) // seconds
{
seconds=0; // reset sedonds
minutes++; // increment minutes counter
}
if (minutes>=60) // minutes
{
minutes=0; // reset minutes
hours++; // increment hours counter
}
if (hours>=24) // hours
hours=0;
}
// ---------- functions ----------
void get_sun(void); // read the CDS cell
void chk_ac(void); // check for AC
//-------- MAIN CODE SEGMENT --------
void main()
{
//------- setup ports -------
setup_timer_1(T1_INTERNAL|T1_DIV_BY_1); // Timer1 ISR(hours, min, sec)
delay_us(100); // wait 100uS
enable_interrupts(INT_TIMER1);
enable_interrupts(GLOBAL);
port_a_pullups(FALSE);
// ----- INITIAL SETTINGS -----
delay_ms(100); // wait 100ms
output_low(PWM); // backup light off
blinktime=blinktime*1000; // convert to milliseconds
// ---------- MAIN LOOP ----------
while(1) // Do forever (main) loop
{
// --- pwm loop ---
ontime=period/100*brightness; // on time (ms) for WM
offtime=period-ontime;; // off time (ms) for PWM
get_sun();
chk_ac();
hours=0; // reset timer
minutes=0; // reset timer
seconds=0;
while(sunflg==0&&acon==0&&minutes<timeout1) // backup light on time
{
output_high(PWM);
delay_us(ontime);
output_low(PWM);
delay_us(offtime);
get_sun();
chk_ac();
}
hours=0; // reset timer
minutes=0; // reset timer
seconds=0;
while(sunflg==0&&acon==0&&minutes<timeout2)// backup light on standby
{
// --- blink light ---
output_high(PWM); // turn pwm on
//delay_us(50); // wait for on time
delay_ms(100); // debug
output_low(PWM); // turn pwm off
delay_ms(blinktime); // wait for off time
get_sun();
chk_ac();
}
}
// ----- END MAIN -----
}
// ---------- FUNCTIONS ----------
//******************************************************
// Function: get_sun *
// Parameters:sun *
// Returns: sunflg (1= sunup, 0= sundown) *
// Description: check the CDS cell. *
// if sun down sunflg=0. *
//******************************************************
void get_sun(void)
{
long n=0;
sunflg=1; // preset to sun up
n=input(sun); // read the cds cell
if(n==0)
sunflg=0; // sundown
}
//******************************************************
// Function: chk_ac *
// Parameters:ac *
// Returns: acon *
// Description: read the ac detect pin 7. *
// return 1 if ac on, 0 if no ac *
//******************************************************
void chk_ac(void)
{
int n=0;
acon=0; // 0= ac off
// --- check the ac pin ---
n=input(ac); // read the acon port
switch (n)
{
case 0: // ac is on
acon=1;
break;
case 1: // ac is off
acon=0;
break;
}
}
页:
[1]