X-Git-Url: http://dolda2000.com/gitweb/?p=kokare.git;a=blobdiff_plain;f=kokare.c;h=f7033d8d29b16e6067445fa70ca1436a5dce9089;hp=f3c65b6fb11042187fc62fb296ff30020ad5e706;hb=HEAD;hpb=1eabd7a93fe49a288464ebd686c3853cb838cfa9

diff --git a/kokare.c b/kokare.c
index f3c65b6..f7033d8 100644
--- a/kokare.c
+++ b/kokare.c
@@ -1,5 +1,6 @@
 #include <avr/io.h>
 #include <avr/interrupt.h>
+#include <avr/eeprom.h>
 #include <inttypes.h>
 #include <math.h>
 
@@ -135,10 +136,10 @@ unsigned char bindisp(unsigned char num)
     return(ret);
 }
 
-void display(char num)
+void display(char num, char d0, char d1)
 {
-    dsp[0] = font[(num / 10) % 10];
-    dsp[1] = font[num % 10];
+    dsp[0] = font[(num / 10) % 10] | (d0?SEGP:0);
+    dsp[1] = font[num % 10] | (d1?SEGP:0);
 }
 
 void disphex(unsigned char num)
@@ -227,16 +228,23 @@ void convcycle(void)
      * 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: 
+     *  T = B / ln(t / (A * C * ln(2)))
+     * Where:
+     *  t = The measured time (s)
+     *  R = The resistance of the thermistor (Ohm)
+     *  C = The capacitance of the capacitor (F)
+     *  T = The temperature (K)
+     *  A, B are the thermistor-specific constants
+     *
+     * In the following code:
      *  a = ttimea as float
-     *  C = 1e6 / (A * C * ln(2))
+     *  C = 1e-6 / (A * C * ln(2))
      *  ra = a * C
      *  l = ln(ra)
      *  t = B / l
      * Note, temperature is in Kelvin
      */
-#define C 9.792934
+#define C 10.819112      /* A is 0.1333469 */
 #define B 4020.0
     if(state == 0) {
 	if((mnow - last > 200000) && tavgok) {
@@ -266,13 +274,21 @@ int main(void)
     int state, cur, run, rstate, delta;
     unsigned long utime;
     
-    state = 0;
-    cur = 100;
+    state = 1;
+    cur = eeprom_read_byte(0);
+    if(cur < 0)
+	cur = 0;
+    if(cur > 100)
+	cur = 100;
     run = 0;
     rstate = 0;
+    utime = getticks();
     init();
     sei();
-    display(0);
+    if(cur < 100)
+	display(cur, 0, 0);
+    else
+	dsp[0] = dsp[1] = SEGG;
 
     while(1) {
 	mnow = getticks();
@@ -289,9 +305,10 @@ int main(void)
 	    if(ktok) {
 		ktok = 0;
 		if((tempk >= 273) && (tempk <= 372)) {
-		    display(tempk - 273);
+		    display(tempk - 273, 0, run);
 		} else {
-		    dsp[0] = dsp[1] = SEGG;
+		    dsp[0] = SEGG;
+		    dsp[1] = SEGG | (run?SEGP:0);
 		}
 	    }
 	    if(pval != 0)
@@ -303,10 +320,6 @@ int main(void)
 		else
 		    run = !run;
 	    }
-	    if(run)
-		dsp[1] |= SEGP;
-	    else
-		dsp[1] &= ~SEGP;
 	} else if(state == 1) {
 	    /* Temp setting */
 	    if(pval != 0) {
@@ -316,27 +329,28 @@ int main(void)
 		    cur = 0;
 		if(cur > 100)
 		    cur = 100;
-		if(cur < 100)
-		    display(cur);
-		else
-		    dsp[0] = dsp[1] = SEGG;
 		utime = mnow;
 	    }
-	    if(mnow - utime > 1000000)
+	    if(mnow - utime > 2000000) {
 		state = 0;
+		eeprom_write_byte(0, cur);
+	    }
 	    if(sstate == 2) {
 		run = !run;
 		sstate = 0;
 	    }
+	    if(cur < 100) {
+		display(cur, 0, run);
+	    } else {
+		dsp[0] = SEGG;
+		dsp[1] = SEGG | (run?SEGP:0);
+	    }
 	} else if(state == 2) {
 	    /* Display raw temp time reading */
 	    if(ttimea < 20000) {
-		display((ttimea / 100) % 100);
-		dsp[0] |= SEGP;
-		if(ttimea >= 10000)
-		    dsp[1] |= SEGP;
+		display((ttimea / 100) % 100, 1, ttimea >= 10000);
 	    } else {
-		display(ttimea / 1000);
+		display(ttimea / 1000, 0, 0);
 	    }
 	    if(sstate == 2) {
 		state = 0;
@@ -357,7 +371,7 @@ int main(void)
 			 * ms. */
 			trdelay = 7;
 		    } else {
-			trdelay = 79 - (delta * 9);
+			trdelay = 75 - (delta * 5);
 		    }
 		} else {
 		    tron = 0;