Analog Read Issue

[Daniel314159]

I am reading voltage between 3.3v and 0v on A2 on the M4 Grandcentral. The board seems to randomly lock up due to firmware issue at specific voltages. I am running the board @ 12bit resolution and have tried 11bit resolution. I will be trying 10bit yet but would prefer to use 12bit for my application.

I am using VScode/Platformio and C to program the board. The error is below:

Exception in thread rx: Traceback (most recent call last): File "C:\Users\Daniel\.platformio\python3\lib\threading.py", line 926, in _bootstrap_inner self.run() File "C:\Users\Daniel\.platformio\python3\lib\threading.py", line 870, in run self._target(*self._args, **self._kwargs) File "c:\users\daniel\.platformio\penv\lib\site-packages\serial\tools\miniterm.py", line 445, in reader data = self.serial.read(self.serial.in_waiting or 1) File "c:\users\daniel\.platformio\penv\lib\site-packages\serial\serialwin32.py", line 257, in in_waiting raise SerialException("ClearCommError failed ({!r})".format(ctypes.WinError())) serial.serialutil.SerialException: ClearCommError failed (PermissionError(13, 'The device does not recognize the command.', None, 22))

The code is here: ` static bool cal = 0; //switch used to avoid locking in calibration loop. static long trun_target_position = 0; long open_position = 81400; // fully open in theory = 81514; float voltage = 0; //input raw voltage static float voltage_memory = 0; //holds previous measured voltage

voltage = analogRead(input_voltage); for (int i = 0; i < 1000; i++) { voltage = voltage + analogRead(input_voltage); smart_delay(3); } voltage = voltage / 1000; Serial.println("Voltage"); Serial.println(voltage);`

[ladyada]

please post a complete but minimal Arduino sketch demonstrating the issue

[Daniel314159]

I apologize for not submitting a code sample. I was pressed for time and ended up using a different board.