From c7befc2a68d78c3bd445433dc55bdc70ea2276e7 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@helsinki.at>
Date: Tue, 3 Jun 2014 02:19:59 +0000
Subject: added support for analog pins (not perfect...)


diff --git a/software/rhmixxx/Makefile b/software/rhmixxx/Makefile
index 60531a5..ae51e01 100644
--- a/software/rhmixxx/Makefile
+++ b/software/rhmixxx/Makefile
@@ -41,3 +41,5 @@ 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 45c89b0..e15c2eb 100644
--- a/software/rhmixxx/analog.c
+++ b/software/rhmixxx/analog.c
@@ -27,10 +27,56 @@
 #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 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;
+
+  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
+}
+
+uint8_t analog_get_value(uint8_t channel)
+{
+#ifndef DISABLE_ANALOG
+  if(channel < ANALOG_NUM_INPUTS)
+    return analog_last_sent[channel];
+#endif
+  return 0;
 }
 
 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);
+    }
+  }
+#endif
 }
diff --git a/software/rhmixxx/analog.h b/software/rhmixxx/analog.h
index 925f5a6..4c98157 100644
--- a/software/rhmixxx/analog.h
+++ b/software/rhmixxx/analog.h
@@ -26,6 +26,7 @@
 #define ANALOG_MIDI_NOTE_OFFSET 64
 
 void analog_init(void);
+uint8_t analog_get_value(uint8_t channel);
 void analog_task(void);
 
 #endif
diff --git a/software/rhmixxx/rhmixxx.c b/software/rhmixxx/rhmixxx.c
index 3e3d66f..f77c23a 100644
--- a/software/rhmixxx/rhmixxx.c
+++ b/software/rhmixxx/rhmixxx.c
@@ -125,13 +125,30 @@ static void process_outgoing_midi(void)
       .Data2       = 0,
       .Data3       = 0,
     };
+  MIDI_EventPacket_t MIDIEventAnalog = (MIDI_EventPacket_t)
+    {
+      .CableNumber = 0, // TODO: hardcoded value
+      .Command     = (MIDI_COMMAND_NOTE_ON >> 4),
+      .Data1       = MIDI_COMMAND_NOTE_ON | 0,
+      .Data2       = 0,
+      .Data3       = 0,
+    };
 
   uint8_t key, state;
   while(eventqueue_pop(&key, &state)) {
     if (USB_DeviceState == DEVICE_STATE_Configured) {
-      MIDI_EventPacket_t* MIDIEvent = state ? &MIDIEventOn : &MIDIEventOff;
-      MIDIEvent->Data2 = key;
-      MIDI_Device_SendEventPacket(&MIDI_Interface, MIDIEvent);
+      MIDI_EventPacket_t* MIDIEvent = NULL;
+      if(key >= ANALOG_MIDI_NOTE_OFFSET && key < ANALOG_MIDI_NOTE_OFFSET + ANALOG_NUM_INPUTS) {
+        MIDIEvent = &MIDIEventAnalog;
+        MIDIEvent->Data2 = key;
+        MIDIEvent->Data3 = analog_get_value(key - ANALOG_MIDI_NOTE_OFFSET);
+      } else {
+        MIDIEvent = state ? &MIDIEventOn : &MIDIEventOff;
+        MIDIEvent->Data2 = key;
+      }
+
+      if(MIDIEvent)
+        MIDI_Device_SendEventPacket(&MIDI_Interface, MIDIEvent);
     }
   }
   if (USB_DeviceState == DEVICE_STATE_Configured)
@@ -157,6 +174,7 @@ int main(void)
 
     keypad_task();
     gpio_task();
+    analog_task();
 
     process_outgoing_midi();
 
-- 
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