import serial

from frappy.core import Readable, Parameter, FloatRange, HasIO, StringIO, Property, IntRange, IDLE, BUSY, WARN, ERROR, Drivable, BoolType, Attached

class TSSOP16_IO(StringIO):
    end_of_line = '\r'
    wait_before = 3.0
    identification = [ ('*IDN?', r'0x48,ACM1219,.*') ]
    
class TSSOP16(HasIO, Readable):
    '''only configured for channel 1'''
    
    ioClass = TSSOP16_IO
    value = Parameter('capacitance', FloatRange(unit='pF'), readonly=True)
    pollinterval = Parameter(default=0.1)
    
    def read_value(self):
        try:
            l = self.communicate('readCVT')
            vals = l.split(',')
            vals = [ float(v) for v in vals ]
            return vals[0]
        except:
            self.io.closeConnection()
            self.io.connectStart()
            time.sleep(3.0)
            return self.read_value()