Initial commit: VesiscanBasic Android app

Port of MedilightV2 iOS app to Android with Kotlin + Jetpack Compose. Includes BLE connectivity, NIRS/Piezo sensor modes, Rive animations, interactive measurement history charts, and foldable device support. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-03-09 17:27:00 +09:00
commit a8532917b4
73 changed files with 5662 additions and 0 deletions
@@ -0,0 +1,60 @@
+package com.example.medilightv2android.ble
+
+object CRC16 {
+    private const val POLYNOMIAL: Int = 0x1021
+    private const val INITIAL_VALUE: Int = 0xFFFF
+
+    fun calculate(data: ByteArray): Int {
+        var crc = INITIAL_VALUE
+        for (byte in data) {
+            crc = crc xor ((byte.toInt() and 0xFF) shl 8)
+            for (j in 0 until 8) {
+                crc = if ((crc and 0x8000) != 0) {
+                    (crc shl 1) xor POLYNOMIAL
+                } else {
+                    crc shl 1
+                }
+                crc = crc and 0xFFFF
+            }
+        }
+        return crc
+    }
+
+    fun calculate(string: String): Int = calculate(string.toByteArray(Charsets.UTF_8))
+
+    fun appendCRC(data: ByteArray): ByteArray {
+        val crc = calculate(data)
+        return data + byteArrayOf(
+            (crc and 0xFF).toByte(),          // Low byte first (Little Endian)
+            ((crc shr 8) and 0xFF).toByte()   // High byte
+        )
+    }
+
+    fun appendCRC(string: String): ByteArray = appendCRC(string.toByteArray(Charsets.UTF_8))
+
+    fun verify(data: ByteArray): Boolean {
+        if (data.size < 2) return false
+        val payload = data.copyOfRange(0, data.size - 2)
+        val receivedCRC = (data[data.size - 2].toInt() and 0xFF) or
+                ((data[data.size - 1].toInt() and 0xFF) shl 8)
+        return calculate(payload) == receivedCRC
+    }
+
+    fun buildCommand(cmd: String, params: IntArray = intArrayOf()): ByteArray {
+        val cmdBytes = "$cmd?".toByteArray(Charsets.UTF_8)
+        val paramBytes = ByteArray(params.size * 2)
+        for (i in params.indices) {
+            paramBytes[i * 2] = (params[i] and 0xFF).toByte()       // Low byte
+            paramBytes[i * 2 + 1] = ((params[i] shr 8) and 0xFF).toByte() // High byte
+        }
+        return appendCRC(cmdBytes + paramBytes)
+    }
+
+    fun buildCommandASCII(cmd: String, asciiParams: String = ""): ByteArray {
+        return appendCRC("$cmd?$asciiParams".toByteArray(Charsets.UTF_8))
+    }
+
+    fun buildSimpleCommand(cmd: String): ByteArray {
+        return appendCRC(cmd.toByteArray(Charsets.UTF_8))
+    }
+}