From 3dead16060cacf01329ae0b5e02223a45a2e21f5 Mon Sep 17 00:00:00 2001
From: Bart Van Der Meerssche <bart.vandermeerssche@flukso.net>
Date: Fri, 12 Feb 2010 19:57:07 +0000
Subject: [PATCH] uc: enable support for sampling both ADC0 and ADC1

---
 uc/main.c | 68 +++++++++++++++++++++++++++++++++----------------------
 uc/main.h | 14 ++++++------
 2 files changed, 48 insertions(+), 34 deletions(-)

diff --git a/uc/main.c b/uc/main.c
index 1ca7c7e..7b8b86b 100644
--- a/uc/main.c
+++ b/uc/main.c
@@ -41,45 +41,60 @@ volatile struct state aux[4] = {{false, false, START, 0}, {false, false, START,
 volatile struct sensor EEMEM EEPROM_measurements[4] = {{SENSOR0, START}, {SENSOR1, START}, {SENSOR2, START}, {SENSOR3, START}};
 volatile struct sensor measurements[4];
 
+uint8_t muxn = 0;
 
 // interrupt service routine for INT0
 ISR(INT0_vect) {
-  measurements[1].value++;
-  aux[1].pulse = true;
-}
-
-// interrupt service routine for INT1
-ISR(INT1_vect) {
   measurements[2].value++;
   aux[2].pulse = true;
 }
 
+// interrupt service routine for INT1
+ISR(INT1_vect) {
+  measurements[3].value++;
+  aux[3].pulse = true;
+}
+
 // interrupt service routine for PCI2 (PCINT20)
+/**
 ISR(PCINT2_vect) {
-  if (aux[3].toggle == false) {
-    aux[3].toggle = true;
+  if (aux[4].toggle == false) {
+    aux[4].toggle = true;
   }
   else {
-    measurements[3].value++;
-    aux[3].pulse = true;
-    aux[3].toggle = false;
+    measurements[4].value++;
+    aux[4].pulse = true;
+    aux[4].toggle = false;
   }
 }
+**/
 
 // interrupt service routine for ADC
 ISR(TIMER2_OVF_vect) {
   // read ADC result
   // add to nano(Wh) counter
-  MacU16X16to32(aux[0].nano, METERCONST, ADC);
+  if (muxn < 2) {
+    MacU16X16to32(aux[muxn].nano, METERCONST, ADC);
 
-  if (aux[0].nano > 1000000000) {
-     measurements[0].value++;
-     aux[0].pulse = true;
-     aux[0].nano -= 1000000000;
-     aux[0].debug = ADC;
+    if (aux[muxn].nano > 1000000000) {
+       measurements[muxn].value++;
+       aux[muxn].pulse = true;
+       aux[muxn].nano -= 1000000000;
+       aux[muxn].debug = ADC;
+    }
+  }
+
+  // rotate amongst the available ADC input channels (0 to 7)
+  muxn = ++muxn & 0x7;
+
+  // but only use ADC0 and 1
+  if (muxn < 2) {
+    ADMUX &= 0xF8;
+    ADMUX |= muxn;
+  
+    // start a new ADC conversion
+    ADCSRA |= (1<<ADSC);
   }
-  // start a new ADC conversion
-  ADCSRA |= (1<<ADSC);
 }
 
 // interrupt service routine for analog comparator
@@ -189,8 +204,8 @@ void setup()
   ACSR |= (1<<ACBG) | (1<<ACIE) | (1<<ACIS1) | (1<<ACIS0);
 
   // Timer2 normal operation
-  // Timer2 clock prescaler set to 8 => fTOV2 = 1000kHz / 256 / 8 = 488.28Hz (DS p.158)
-  TCCR2B |= (1<<CS21);
+  // Timer2 clock prescaler set to 1 => fTOV2 = 1000kHz / 256 / 1 = 3906.24Hz (DS p.158)
+  TCCR2B |= (1<<CS20);
   TIMSK2 |= (1<<TOIE2);
 
   // disable digital input cicuitry on ADCx pins to reduce leakage current
@@ -198,11 +213,8 @@ void setup()
 
   // select VBG as reference for ADC
   ADMUX |= (1<<REFS1) | (1<<REFS0);
-  // ADCn selected via main.h
-  ADMUX |= MUXN;
   // ADC prescaler set to 8 => 1000kHz / 8 = 125kHz (DS p.258)
   ADCSRA |= (1<<ADPS1) | (1<<ADPS0);
-
   // enable ADC and start a first ADC conversion
   ADCSRA |= (1<<ADEN) | (1<<ADSC);
 
@@ -243,10 +255,12 @@ void loop()
   // check whether we have to send out a pls to the deamon
   for (i=0; i<4; i++) {
     if (aux[i].pulse == true) {
-      if (i == 0) {
+      if (i < 2) {
         //debugging
-        printString("msg ADC sample value: ");
-        printIntegerInBase((unsigned long)aux[0].debug, 10);
+        printString("msg ADC");
+        printInteger((long)i);
+        printString(" sample value: ");
+        printIntegerInBase((unsigned long)aux[i].debug, 10);
         printString("\n");
       }
       send((const struct sensor *)&measurements[i]);
diff --git a/uc/main.h b/uc/main.h
index c478a08..e7b01c7 100644
--- a/uc/main.h
+++ b/uc/main.h
@@ -43,32 +43,32 @@
 #ifndef METERCONST
   #if TYPE == 2201   // 220V - 1-phase @ 488.28Hz sampling rate
     #define METERCONST 6783
-    #define MUXN 0
+//    #define MUXN 0
     #warning "220V - 1-phase selected. METERCONST set to 6783"
 
   #elif TYPE == 2203 // 220V - 3-phase @ 488.28Hz sampling rate
     #define METERCONST 6721
-    #define MUXN 1
+//    #define MUXN 1
     #warning "220V - 3-phase selected. METERCONST set to 6721"
 
-  #elif TYPE == 2301   // 230V - 1-phase @ 488.28Hz sampling rate
+  #elif TYPE == 2301 // 230V - 1-phase @ 488.28Hz sampling rate
     #define METERCONST 7091
-    #define MUXN 0
+//    #define MUXN 0
     #warning "230V - 1-phase selected. METERCONST set to 7091"
 
   #elif TYPE == 2303 // 230V - 3-phase @ 488.28Hz sampling rate
     #define METERCONST 7026
-    #define MUXN 1
+//    #define MUXN 1
     #warning "230V - 3-phase selected. METERCONST set to 7026"
 
   #elif TYPE == 2401 // 240V - 1-phase @ 488.28Hz sampling rate
     #define METERCONST 7399
-    #define MUXN 0
+//    #define MUXN 0
     #warning "240V - 1-phase selected. METERCONST set to 7399"
 
   #elif TYPE == 2403 // 240V - 3-phase @ 488.28Hz sampling rate
     #define METERCONST 7331
-    #define MUXN 1
+//    #define MUXN 1
     #warning "240V - 3-phase selected. METERCONST set to 7331"
   #endif
 #endif