Reset MCU

MCUReset.kt

private val rebootCodesArray = intArrayOf(-1500, -1501, -1502, -4010)
private val resetMcuInterval = 25000
private var isReOpenDevice = false
private var lastResetTime = 0L

//Check error code after calling checkCardEx(buffer) and if there is a error reset it
//////// This block has to be called after checkCardEx(buffer)
(errorCode != -4013).ifTrue {
    "Error $errorCode checking card ID".log(TAG)
}
(rebootCodesArray.contains(errorCode) && !isReOpenDevice).ifTrue {
    resetMcu()
    killMyself(errorCode)
}
////////////////////////////////////////////////////////////////

private fun resetMcu() {
  if (SystemClock.elapsedRealtimeNanos() - lastResetTime > resetMcuInterval) {
      var mcuUsbPath = "/dev/bus/usb/001/006"
      val usbManager = context.getSystemService(Context.USB_SERVICE) as UsbManager
      for (usbDevice in usbManager.deviceList.values) {
          if (usbDevice.vendorId == 1155 && usbDevice.productId == 22304) {
              Log.i("MCU", "mcu path :${usbDevice.deviceName}")
              mcuUsbPath = usbDevice.deviceName
              break
          }
      }

      try {
          val ret = JniUsbController.resetUsb(mcuUsbPath)
          Log.i(TAG, "usbReset $mcuUsbPath: "
                  + if (ret) "success" else "failed")
      } catch (e: Exception) {
          //if catch the exception ,do reset directly
          val directRet = JniUsbController.resetUsbDevice(mcuUsbPath)
          Log.e(TAG, "direct reset usb  $mcuUsbPath: $directRet")
          e.printStackTrace()
      } finally {
          lastResetTime = SystemClock.elapsedRealtimeNanos()
      }
  } else {
      Log.e(TAG, "The two intervals of reset mcu are too short")
  }
}

private fun killMyself(code: Int) {
    isReOpenDevice = true
    val log = "MCU has error , error code $code kill myself"
    Log.e(TAG, log)
    execCommands("kill " + Process.myPid())
    isReOpenDevice = false
}

/// This function comes from our library which was written JAVA it can be converted kotlin easily
public static int execCommands(final String... commands) throws IOException {

  int result = 1;
  final Runtime runTime = Runtime.getRuntime();
  final Process process = runTime.exec("su");
  final DataOutputStream os = new DataOutputStream(
      process.getOutputStream());
  try {
    for (int i = 0; i < commands.length; i++) {
      os.writeBytes(commands[i] + "\n");
      os.flush();
    }
    os.writeBytes("exit\n");

    os.flush();
    process.waitFor();

    result = process.exitValue();
    Log.d(TAG, "process result is " + result);
  } catch (final InterruptedException e) {
    return result;
  } finally {
    os.close();
  }
  return result;
}