From 55ab6ba1122ed2c04596feea6c94ea056da825a3 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@helsinki.at>
Date: Tue, 3 Jun 2014 15:40:33 +0000
Subject: enable and disable analog channel via midi works now


diff --git a/software/rhmixxx/Makefile b/software/rhmixxx/Makefile
index ae51e01..60531a5 100644
--- a/software/rhmixxx/Makefile
+++ b/software/rhmixxx/Makefile
@@ -41,5 +41,3 @@ LUFA_OPTS += -D USB_PRODUCT="L\"rhmixxx midi controller\"" -D USB_PRODUCT_LEN=23
 LUFA_COMPONENTS := USB USBCLASS SERIAL
 
 include ../include.mk
-
-CFLAGS += -DDISABLE_ANALOG
diff --git a/software/rhmixxx/analog.c b/software/rhmixxx/analog.c
index e15c2eb..5ddd20f 100644
--- a/software/rhmixxx/analog.c
+++ b/software/rhmixxx/analog.c
@@ -27,56 +27,81 @@
 #define ANALOG_PORT PORTF
 #define ANALOG_DDR DDRF
 
-#ifndef DISABLE_ANALOG
-
 #include <LUFA/Drivers/Peripheral/ADC.h>
-uint8_t analog_last_sent[ANALOG_NUM_INPUTS];
+
+static struct {
+  uint8_t enabled;
+  uint8_t last_sent;
+} analog_input_state[ANALOG_NUM_INPUTS];
+
 static uint8_t analog_channels[] = { ADC_CHANNEL0, ADC_CHANNEL1, ADC_CHANNEL2, ADC_CHANNEL3,
                                      ADC_CHANNEL4, ADC_CHANNEL5, ADC_CHANNEL6, ADC_CHANNEL7 };
 
-#endif
-
 void analog_init(void)
 {
   ANALOG_DDR = 0x00;
   ANALOG_PORT = 0x00;
 
-#ifndef DISABLE_ANALOG
   int i;
-  for(i = 0; i < ANALOG_NUM_INPUTS; ++i)
-    analog_last_sent[i] = 0;
+  for(i = 0; i < ANALOG_NUM_INPUTS; ++i) {
+    analog_input_state[i].enabled = 0;
+    analog_input_state[i].last_sent = 0;
+  }
 
-  ADC_Init(ADC_SINGLE_CONVERSION | ADC_PRESCALE_2);
-  ADC_SetupChannel(ADC_CHANNEL0);
-  ADC_SetupChannel(ADC_CHANNEL1);
-  ADC_SetupChannel(ADC_CHANNEL2);
-  ADC_SetupChannel(ADC_CHANNEL3);
-  ADC_SetupChannel(ADC_CHANNEL4);
-  ADC_SetupChannel(ADC_CHANNEL5);
-  ADC_SetupChannel(ADC_CHANNEL6);
-  ADC_SetupChannel(ADC_CHANNEL7);
-#endif
+  ADC_Init(ADC_SINGLE_CONVERSION | ADC_PRESCALE_32);
 }
 
-uint8_t analog_get_value(uint8_t channel)
+static void analog_channel_set_enabled(uint8_t channel, uint8_t enabled)
+{
+  if(enabled) {
+    ADC_SetupChannel(channel);
+    analog_input_state[channel].enabled = 1;
+  } else {
+    ADC_DisableChannel(channel);
+    analog_input_state[channel].enabled = 0;
+  }
+}
+
+void analog_enable_channel(uint8_t channel)
 {
-#ifndef DISABLE_ANALOG
   if(channel < ANALOG_NUM_INPUTS)
-    return analog_last_sent[channel];
-#endif
-  return 0;
+    analog_channel_set_enabled(channel, 1);
+  else if(channel == ANALOG_MIDI_NOTE_ALL_INPUTS - ANALOG_MIDI_NOTE_OFFSET) {
+    int i;
+    for(i = 0; i < ANALOG_NUM_INPUTS; ++i)
+      analog_channel_set_enabled(i, 1);
+  }
+}
+
+void analog_disable_channel(uint8_t channel)
+{
+  if(channel < ANALOG_NUM_INPUTS)
+    analog_channel_set_enabled(channel, 0);
+  else if(channel == ANALOG_MIDI_NOTE_ALL_INPUTS - ANALOG_MIDI_NOTE_OFFSET) {
+    int i;
+    for(i = 0; i < ANALOG_NUM_INPUTS; ++i)
+      analog_channel_set_enabled(i, 0);
+  }
+}
+
+uint8_t analog_get_value(uint8_t channel)
+{
+  if(channel >= ANALOG_NUM_INPUTS)
+    return 0;
+
+  return analog_input_state[channel].last_sent;
 }
 
 void analog_task(void)
 {
-#ifndef DISABLE_ANALOG
   uint8_t i;
   for(i = 0; i < ANALOG_NUM_INPUTS; ++i) {
-    uint8_t tmp = (ADC_GetChannelReading(ADC_REFERENCE_AVCC | ADC_RIGHT_ADJUSTED | analog_channels[i])) >> 3;
-    if(analog_last_sent[i] != tmp) {
-      analog_last_sent[i] = tmp;
-      eventqueue_push(ANALOG_MIDI_NOTE_OFFSET + i, 0);
+    if(analog_input_state[i].enabled) {
+      uint8_t tmp = (ADC_GetChannelReading(ADC_REFERENCE_AVCC | ADC_RIGHT_ADJUSTED | analog_channels[i])) >> 3;
+      if(analog_input_state[i].last_sent != tmp) {
+        analog_input_state[i].last_sent = tmp;
+        eventqueue_push(ANALOG_MIDI_NOTE_OFFSET + i, 0);
+      }
     }
   }
-#endif
 }
diff --git a/software/rhmixxx/analog.h b/software/rhmixxx/analog.h
index 4c98157..d72be94 100644
--- a/software/rhmixxx/analog.h
+++ b/software/rhmixxx/analog.h
@@ -24,8 +24,11 @@
 
 #define ANALOG_NUM_INPUTS 8
 #define ANALOG_MIDI_NOTE_OFFSET 64
+#define ANALOG_MIDI_NOTE_ALL_INPUTS ANALOG_MIDI_NOTE_OFFSET + 31
 
 void analog_init(void);
+void analog_enable_channel(uint8_t channel);
+void analog_disable_channel(uint8_t channel);
 uint8_t analog_get_value(uint8_t channel);
 void analog_task(void);
 
diff --git a/software/rhmixxx/rhmixxx.c b/software/rhmixxx/rhmixxx.c
index f77c23a..a9d3fcc 100644
--- a/software/rhmixxx/rhmixxx.c
+++ b/software/rhmixxx/rhmixxx.c
@@ -103,6 +103,14 @@ static void process_incoming_midi(void)
           case 2: gpio_out_toggle(note - GPIO_MIDI_NOTE_OFFSET); break;
         }
       }
+    } else if((note >= ANALOG_MIDI_NOTE_OFFSET && note < ANALOG_MIDI_NOTE_OFFSET + ANALOG_NUM_INPUTS) ||   // ANALOG
+              note == ANALOG_MIDI_NOTE_ALL_INPUTS) {
+      if(cmd == MIDI_COMMAND_NOTE_ON) {
+        switch(value) {
+          case 0: analog_disable_channel(note - ANALOG_MIDI_NOTE_OFFSET); break;
+          case 1: analog_enable_channel(note - ANALOG_MIDI_NOTE_OFFSET); break;
+        }
+      }
     }
   }
 }
-- 
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