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--- en:adccontrol [2014/07/01 16:26]
ruppi [Software]
+++ en:adccontrol [2014/07/01 16:26] (current)
ruppi [Software]
@@ Line 1: / Line 1: @@
+====== Overview ======
+ This document explain how to control ADC on the Odroid ADK board by Android ADK App.**
+ PIC24FJ64GB002 is going to try read ADC value from voltage at the battery and the Variable Resistor, and transfer to Android ADK App.**
+ ADK App display the result based on the ADC value.
+----
+ 이 문서는 Odroid ADK Board 를 이용하여 ADC 를 제어하는 Android ADK app 를 설명한다.
+ PIC24FJ64GB002 칩은 밧데리와 가변저항의 전압을 ADC 값으로 읽어 와서, Android ADK app 으로 전달한다.
+ Android ADK App 는 ADC 값을 바탕으로 화면에 결과를 표시한다.
+====== What you need ======
+  * ADK Board
+  * ADK IO Kit
+  * Mini Breadboard
+  * Variable Resister x 1ea
+  * jumper wires
+====== Knowledge Base ======
+===== Variable Resister =====
+* Symbol
+{{:en:vResister.jpg}}
+===== ADC(Analog to Digital Converter) =====
+Please refer to PIC24F Family Reference Manual, Sect. 17 10-Bit A/D Converter.([http://ww1.microchip.com/downloads/en/DeviceDoc/39705b.pdf])
+====== Circuit ======
+{{:en:Odroid_ADK_ADC_fz.png?520}}
+{{:en:Odroid_ADK_ADC_pic.png}}
+====== Schematic ======
+{{:en:Odroid_ADK_ADC_schem.png}}
+====== Video ======
+ [http://www.youtube.com/watch?v=gjGIvDDPYD4]
+ [[Play(http://www.youtube.com/embed/gjGIvDDPYD4?hl=ko&fs=1)]]
+====== Software ======
+**ADK**
+**svn check out**
+**http://dev.odroid.com/svn/accessory/trunk/ODROIDAccessoryADCDemo**
+<code>
+    private void initDevice() {
+        Log.e(TAG, "initDevice");
+        // fix bug
+        // You must call function to use GPIO input mode, if firmware version is 1.0
+        initI2C();
+        initBMP180();
+        // fix bug
+        initADC(true);
+    }
+</code>
+초기화 후 handler에서 battery 값과 ADC 값을 읽어 표시하면 됩니다.
+<code>
+        accessoryManager.read(commandPacket);
+    switch(commandPacket[0]) {
+        case RECEIVED_LETTER_ADC:
+            value = (short) (commandPacket[3] << 8);
+            value |= (short) (commandPacket[4] & 0x00ff);
+            updateADC(value);
+            break;
+        case RECEIVED_LETTER_BATT:
+            value = (short) (commandPacket[3] << 8);
+            value |= (short) (commandPacket[4] & 0x00ff);
+            updateBatt(value);
+            break;
+</code>
+**Bluetooth**
+**svn check out**
+**http://dev.odroid.com/svn/accessory/trunk/ODROIDBluetoothADCDemo**
+**svn check out**
+**http://dev.odroid.com/svn/accessory/trunk/ODROIDBluetoothADCDemo**
+ADK 펌웨어에서는 자동으로 ADC와 Battery 값을 보내 주지만, BaB 펌웨어에서는 request해야 보내 줍니다.
+그래서 Timer를 두어 protocal로 request를 보내고 받아서 처리하면 됩니다.
+<code>
+private void getADC() {
+        //Log.e(TAG, "getADC");
+        Message msg = Message.obtain(handler, SEND_LETTER_ADC_CONFIG, ADC_PORT, 0);
+        handler.sendMessage(msg);
+    }
+private void getBattery() {
+        //Log.e(TAG, "getBattery");
+        Message msg = Message.obtain(handler, SEND_LETTER_BATT, 0, 0);
+        handler.sendMessage(msg);
+    }
+</code>