eleksir/simpleclock
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Implement ISR and timers

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* Poll RTC by trigger, set via ISR
* Change blink state by trigger, set via ISR
* Set time compensation trigger in ISR
* Refresh clock by timer
* Poll photoresistor by same timer as above
* Stop continuously calculate brightness, do it by the same timer as above
This commit is contained in:
eleksir
2019-07-27 15:34:03 +03:00
parent 0afc0383c4
commit ea293ec335
1 changed files with 167 additions and 103 deletions
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244
simpleclock.ino
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@@ -11,6 +11,9 @@
#include <DS1307.h>
#include <SevSeg.h>
#define cbi(sfr, bit) (_SFR_BYTE(sfr) &= ~_BV(bit))
#define sbi(sfr, bit) (_SFR_BYTE(sfr) |= _BV(bit))
DS1307 clock;
SevSeg Display;
@@ -20,25 +23,32 @@ const long adjust_interval = 200; // delay between consecutive number increments
const long bounce_delay = 20; // contact bounce compensation
const int hrs_btn = A0; // put hour adjusting button on A0 lane
const int min_btn = A1; // put minute adjusting button on A1 lane
bool btn_pushed = false; // is button pushed?
unsigned long currentPushTimer;
volatile bool btn_pushed = false; // is button pushed?
unsigned long previousPushTimer = 0;
uint8_t minutes;
uint8_t hours;
/* dot blinking stuff */
unsigned long currentMillis;
unsigned long previousMillis = 0;
const long interval = 500;
bool dot = true;
volatile bool dot = true;
/* time inaccuracy compensation flag */
bool compflag = true;
const uint8_t timeSkew = 6; // assume that clock runs faster than should
bool timeSkewEven = false; // comp. 1 additional second per 2 days
volatile bool compflag1 = true;
volatile bool compflag2 = false;
const uint8_t timeSkew = 8; // assume that clock runs faster than should
volatile bool timeSkewEven = false; // comp. 1 additional second per 2 days
/* ambient light compensation aka night mode */
const int photoPin = A2;
volatile bool measureAmbLight = true;
unsigned int ambLight = 0;
unsigned long previousLightTimer = 0;
const long refresh_interval = 40; // refresh rate 25Hz
/* time vars */
volatile uint8_t mysecond;
volatile uint8_t myminute;
volatile uint8_t myhour;
/* rtc sync flag */
volatile bool rtcsync = true;
void setup()
{
@@ -49,7 +59,7 @@ void setup()
byte segmentPins[] = {2, 3, 4, 5, 6, 7, 8, 13};
bool resistorsOnSegments = true; // 8 resistors, 330 Ohms each
/* updateWithDelays defaults to false and it is recommended value,
* but i was unable to make my display to change brightness with
* but i was unable to make my display to change brightness notably with
* recommended value, so i have to use updateWithDelays=true,
* in this case brightness gets changed.
*/
@@ -80,25 +90,96 @@ void setup()
pinMode(hrs_btn, INPUT_PULLUP);
pinMode(min_btn, INPUT_PULLUP);
/* Timer stuff
* timer0 being used in millis() micros() delay() etc, it has 8 bit resolution
* timer2 being used in analogWrite() tone() notone(), it has 8 bit resolution
* timer1 being used in servo lib has 16 bit resolution
* We'll use timer1, since we have no mechanical parts and don't need servo lib
*/
// initialize timer1
noInterrupts(); // disable all interrupts
TCCR1A = 0;
TCCR1B = 0;
TCNT1 = 34286; // preload timer 65536-16MHz/256/2Hz
TCCR1B |= (1 << CS12); // 256 prescaler
TIMSK1 |= (1 << TOIE1); // enable timer overflow interrupt
interrupts(); // enable all interrupts
/* increase sampling rate of analogRead()
* by setting an ADC prescale from 128 to 16, so it takes less time to read
* sensor
*/
sbi(ADCSRA, ADPS2);
cbi(ADCSRA, ADPS1);
cbi(ADCSRA, ADPS0);
// setup ambient brigtness sensor
pinMode(photoPin, INPUT);
ambLight = analogRead(photoPin);
}
ISR(TIMER1_OVF_vect)
{
/* Feed clock twice per second */
TCNT1 = 34286; // preload timer
// do not read rtc if time beng adjusted by buttons
(btn_pushed) ? rtcsync : rtcsync = true;
/* Also switch dot */
if (dot)
dot = false;
else
dot = true;
/* time compensation magic */
if ((myhour == 21) and (myminute == 21) and (mysecond == 21)
and (compflag2)) {
compflag1 = true;
(timeSkewEven) ? timeSkewEven = false : timeSkewEven;
}
if ((myhour == 21) and (myminute == 21) and (mysecond == 23)) {
compflag1 = false;
compflag2 = true;
}
}
void loop()
{
currentMillis = millis();
currentPushTimer = currentMillis;
unsigned long currentMillis = millis();
char str[4];
float d;
unsigned int ambLight = analogRead(photoPin);
/*
* Let's implement time compenstion for individual rtc module time
* charachteristics. In in my case quartz resonator as inaccurate as
* about +8.5 seconds per 24 hours
*/
if (compflag1 && compflag2) {
if (timeSkewEven) {
clock.fillByHMS(myhour, myminute, (mysecond - timeSkew - 1));
} else {
clock.fillByHMS(myhour, myminute, (mysecond - timeSkew));
}
clock.setTime();
compflag2 = false;
}
if (rtcsync) {
clock.getTime();
mysecond = clock.second;
myminute = clock.minute;
myhour = clock.hour;
rtcsync = false;
}
// push button magic
if ((!btn_pushed) and
((digitalRead(hrs_btn) == LOW) or (digitalRead(min_btn) == LOW))) {
if (currentPushTimer - previousPushTimer >= initial_delay) {
previousPushTimer = currentPushTimer;
if (currentMillis - previousPushTimer >= initial_delay) {
previousPushTimer = currentMillis;
btn_pushed = true;
}
}
@@ -106,112 +187,95 @@ void loop()
if (btn_pushed and
(digitalRead(hrs_btn) != LOW) and (digitalRead(min_btn) != LOW)) {
// compensate possible contact bounce with delay
if (currentPushTimer - previousPushTimer >= bounce_delay) {
if (currentMillis - previousPushTimer >= bounce_delay) {
btn_pushed = false;
}
}
if (btn_pushed) {
if (currentPushTimer - previousPushTimer >= adjust_interval) {
previousPushTimer = currentPushTimer;
if (currentMillis - previousPushTimer >= adjust_interval) {
previousPushTimer = currentMillis;
if (digitalRead(hrs_btn) == LOW) {
hours = clock.hour + 1;
(hours > 23) ? hours = 0 : hours;
clock.fillByHMS(hours, clock.minute, 0);
myhour++;
(myhour > 23) ? myhour = 0 : myhour;
clock.fillByHMS(myhour, myminute, 0);
clock.setTime();
}
if (digitalRead(min_btn) == LOW) {
minutes = clock.minute + 1;
(minutes > 59) ? minutes = 0 : minutes;
clock.fillByHMS(clock.hour, minutes, 0);
myminute++;
(myminute > 59) ? myminute = 0 : myminute;
clock.fillByHMS(myhour, myminute, 0);
clock.setTime();
}
}
}
if (currentMillis - previousMillis >= interval) {
previousMillis = currentMillis;
if ((currentMillis - previousLightTimer >= refresh_interval) or
(previousLightTimer > currentMillis)) { // millis() reset every ~49 days
previousLightTimer = currentMillis;
ambLight = analogRead(photoPin);
if (dot)
dot = false;
else
dot = true;
}
/*
* Let's implement time compenstion for individual rtc module time
* charachteristics. In in my case quartz resonator as inaccurate as
* +/- about 6.5 seconds per 24 hours, maybe its require more EMI
* shielding?
/* Ambient light compensation
* ambLight can be in range of 0..1023, if it 910+, it has point to use
* fullbright.
* Use table comparsion (not function of ambLight) because of non-linear
* charachteristics of led indicator, that cannot be described via simple
* formula.
*/
if ((clock.hour == 21) and (clock.minute == 21) and
(clock.second == 21) and (compflag)) {
if (timeSkewEven) {
timeSkewEven = false;
clock.fillByHMS(clock.hour, clock.minute,
(clock.second - timeSkew - 1));
} else {
timeSkewEven = true;
clock.fillByHMS(clock.hour, clock.minute,
(clock.second - timeSkew));
}
clock.setTime();
compflag = false;
}
if ((clock.hour == 21) and (clock.minute == 21) and
(clock.second == 23) and (!compflag)) {
compflag = true;
if (ambLight >= 910) {
Display.setBrightness(100);
} else if ((ambLight < 900) and (ambLight >= 860)) {
Display.setBrightness(75);
} else if ((ambLight < 850) and (ambLight >= 810)) {
Display.setBrightness(45);
} else if ((ambLight < 800) and (ambLight >= 760)) {
Display.setBrightness(25);
} else if ((ambLight < 750) and (ambLight >= 710)) {
Display.setBrightness(18);
} else if ((ambLight < 700) and (ambLight >= 660)) {
Display.setBrightness(12);
} else if ((ambLight < 650) and (ambLight >= 610)) {
Display.setBrightness(10);
} else if ((ambLight < 600) and (ambLight >= 560)) {
Display.setBrightness(7);
} else if ((ambLight < 550) and (ambLight >= 410)) {
Display.setBrightness(4);
} else if ((ambLight < 400) and (ambLight >= 360)) {
Display.setBrightness(0);
} else if ((ambLight < 350) and (ambLight >= 310)) {
Display.setBrightness(-3);
} else if ((ambLight < 300) and (ambLight >= 260)) {
Display.setBrightness(-5);
} else if ((ambLight < 250) and (ambLight >= 210)) {
Display.setBrightness(-7);
} else if ((ambLight < 200) and (ambLight >= 160)) {
Display.setBrightness(-9);
} else if ((ambLight < 150) and (ambLight >= 110)) {
Display.setBrightness(-12);
} else if (ambLight < 100) {
Display.setBrightness(-15);
}
// make blinking dot
if (clock.hour > 0) {
if (myhour > 0) {
if (dot) {
Display.setNumber((clock.hour * 100 + clock.minute), 2);
Display.setNumber((myhour * 100 + myminute), 2);
} else {
Display.setNumber((clock.hour * 100 + clock.minute));
Display.setNumber((myhour * 100 + myminute));
}
} else {
/* 0 o'clock is an exception, we don't want to see "00.00", we
want see "0.00" or "0 00", so we have to use this "hack" */
if (dot) {
d = float(clock.minute) / 100;
d = float(myminute) / 100;
Display.setNumber(d, 2);
} else {
sprintf(str, "%2d%02d", clock.hour, clock.minute);
sprintf(str, "%2d%02d", myhour, myminute);
Display.setChars(str);
}
}
/* ambient light compensation
* ambLight can be in range of 0..1023, if it 800, it has point to use
* fullbright
*/
if (ambLight >= 940) {
Display.setBrightness(100);
} else if ((ambLight < 900) and (ambLight >= 840)) {
Display.setBrightness(75);
} else if ((ambLight < 800) and (ambLight >= 735)) {
Display.setBrightness(40);
} else if ((ambLight < 700) and (ambLight >= 635)) {
Display.setBrightness(15);
} else if ((ambLight < 600) and (ambLight >= 530)) {
Display.setBrightness(12);
} else if ((ambLight < 500) and (ambLight >= 430)) {
Display.setBrightness(10);
} else if ((ambLight < 400) and (ambLight >= 325)) {
Display.setBrightness(8);
} else if ((ambLight < 300) and (ambLight >= 220)) {
Display.setBrightness(6);
} else if ((ambLight < 200) and (ambLight >= 110)) {
Display.setBrightness(4);
} else if (ambLight < 100) {
Display.setBrightness(3);
}
Display.refreshDisplay();