#include <avr/io.h>
#include <avr/interrupt.h>
#include <inttypes.h>
+#include <math.h>
#define SEGA 4
#define SEGB 2
SEGA | SEGE | SEGF | SEGG,
};
/* LED */
+#define LCDELAY 1000
uint8_t dsp[2] = {0, 0};
char leda = 0;
char ledc = 0;
/* Timer */
-char of = 0;
-int oticks = 0;
+volatile char of = 0;
+volatile int oticks = 0;
unsigned long mnow;
/* Pulse counter */
-char pstate = 0;
+volatile char pstate = 0;
char pval = 0;
/* Switch */
-char sstate = 0;
+volatile char sstate = 0;
int stime = 0;
/* Temp sensor */
-char tstate = 0;
-char tlock = 0;
+volatile char tstate = 0;
+volatile char tlock = 0;
unsigned long tstart;
unsigned long ttime;
unsigned long ttimea = 10000;
char tavgok = 0;
+/* Conversion loop */
+int tempk;
+volatile ktok = 0;
/* Zero-cross detector*/
-char zok = 0;
-unsigned long ztime;
+volatile char zok = 0;
+volatile char ztime = 0;
/* Triac */
char trstate = 0;
char tron = 0;
-unsigned long trtime;
-unsigned short trdelay = 0;
+volatile char trtime;
+volatile char trdelay = 0;
void init(void)
{
- /* Timer init */
+ /* Timer init
+ * Timer 0 cycles timing sensitive subsystems
+ * Timer 1 is used for global timing
+ */
+ OCR0A = 100;
+ TCCR0A = 2;
+ TCCR0B = 1;
+ TIMSK0 = 2;
TCCR1A = 0;
TCCR1B = 1;
TIMSK1 = 1;
static uint16_t last = 0;
uint8_t c, d, v;
- if(TCNT1 - last > 500) {
+ if(TCNT1 - last > LCDELAY) {
last = TCNT1;
if(++leda >= 8) {
leda = 0;
} else {
c = d = 0;
}
+ cli();
PORTC = c;
PORTD = (PORTD & 0x0f) | d;
+ sei();
}
}
{
if(tstate == 0) {
if((PIND & 8) && (tlock == 0)) {
+ cli();
PORTD |= 2;
+ sei();
tstart = mnow;
tstate = 1;
}
} else if(tstate == 1) {
if(mnow - tstart > 1000) {
+ cli();
PORTD &= ~2;
+ sei();
tstate = 0;
tstart = mnow;
}
}
}
-void triaccycle(void)
+void convcycle(void)
{
- if(trstate == 0) {
- if(tron && zok && (mnow > ztime + trdelay)) {
- PORTD |= 1;
- zok = 0;
- trstate = 1;
- trtime = mnow;
- }
- } else if(trstate == 1) {
- if(mnow > trtime + 500) {
- PORTD &= ~1;
- trstate = 0;
+ static char state = 0;
+ static unsigned long last = 0;
+ static float a, ra, l, t;
+
+ /*
+ * Theoretically:
+ * t = RC * ln(2) => R = t / (C * ln(2))
+ * R = A * exp(B / T) => T = B / ln(R / A)
+ * T = B / ln(R / (A * C * ln(2)))
+ * In the following:
+ * a = ttimea as float
+ * C = 1e6 / (A * C * ln(2))
+ * ra = a * C
+ * l = ln(ra)
+ * t = B / l
+ * Note, temperature is in Kelvin
+ */
+#define C 9.792934
+#define B 4020.0
+ if(state == 0) {
+ if((mnow - last > 200000) && tavgok) {
+ a = (float)ttimea;
+ state = 1;
+ tavgok = 0;
+ last = mnow;
}
+ } else if(state == 1) {
+ ra = a * C;
+ state = 2;
+ } else if(state == 2) {
+ l = log(ra);
+ state = 3;
+ } else if(state == 3) {
+ t = B / l;
+ state = 4;
+ } else if(state == 4) {
+ tempk = (int)t;
+ ktok = 1;
+ state = 0;
}
}
ledcycle();
tempcycle();
calcavg();
- triaccycle();
+ convcycle();
#if 1
/*
*/
if(state == 0) {
/* Display temperature */
- if(tavgok) {
- tavgok = 0;
- if(ttimea < 20000) {
- display((ttimea / 100) % 100);
- dsp[0] |= SEGP;
- if(ttimea >= 10000)
- dsp[1] |= SEGP;
+ if(ktok) {
+ ktok = 0;
+ if((tempk >= 273) && (tempk <= 372)) {
+ display(tempk - 273);
} else {
- display(ttimea / 1000);
+ dsp[0] = dsp[1] = SEGG;
}
}
if(pval != 0) {
state = 1;
utime = mnow;
}
+ if(sstate == 2) {
+ sstate = 0;
+ if(stime > 10) {
+ state = 2;
+ } else {
+ tron = !tron;
+ }
+ }
} else if(state == 1) {
/* Triac control */
if(pval != 0) {
if(cur > 99)
cur = 99;
display(cur);
- trdelay = 10000 - ((unsigned short)cur * 100);
+ trdelay = 99 - cur;
utime = mnow;
}
if(mnow - utime > 1000000) {
state = 0;
}
- }
- if(sstate == 2) {
- tron = !tron;
- sstate = 0;
+ if(sstate == 2) {
+ tron = !tron;
+ sstate = 0;
+ }
+ } else if(state == 2) {
+ if(ttimea < 20000) {
+ display((ttimea / 100) % 100);
+ dsp[0] |= SEGP;
+ if(ttimea >= 10000)
+ dsp[1] |= SEGP;
+ } else {
+ display(ttimea / 1000);
+ }
+ if(sstate == 2) {
+ state = 0;
+ sstate = 0;
+ }
}
#endif
/*
if(cur > 99)
cur = 99;
display(cur);
- trdelay = 10000 - ((unsigned short)cur * 100);
+ trdelay = 99 - cur;
pval = 0;
}
if(sstate == 2) {
tron = !tron;
sstate = 0;
}
+ if(tron)
+ dsp[1] |= SEGP;
+ else
+ dsp[1] &= ~SEGP;
#endif
#if 0
/*
} else {
display(cur);
}
+ if(PINB & 4)
+ dsp[1] |= SEGP;
#endif
}
}
ISR(SIG_INTERRUPT0)
{
- ztime = getticks();
+ ztime = 0;
zok = 1;
}
}
}
+ISR(SIG_OUTPUT_COMPARE0A)
+{
+ if(trstate == 0) {
+ ztime++;
+ if(tron && (ztime >= trdelay)) {
+ PORTD |= 1;
+ trstate = 1;
+ trtime = 0;
+ }
+ } else if(trstate == 1) {
+ trtime++;
+ if(trtime >= 5) {
+ PORTD &= ~1;
+ trstate = 0;
+ }
+ }
+}
+
ISR(SIG_OVERFLOW1)
{
of = 1;
ISR(SIG_PIN_CHANGE0)
{
- if((sstate == 0) & ((PINB & 4) == 0)) {
+ if((sstate == 0) && !(PINB & 4)) {
stime = oticks;
sstate = 1;
}
- if((sstate == 1) & ((PINB & 4) == 1)) {
+ if((sstate == 1) && (PINB & 4)) {
stime = oticks - stime;
sstate = 2;
}