# adcRead_test.py   
# program to test adcRead() to read nChannel on the ADS1115 ADC RPi module from SeeedStuios
# by D@CC on 2022CMar16

# needs to have adcRead_Pkg.py in the same folder as adcRead_test.py
# needs import time
import time
# needs from adcRead_Pkg import adcRead,adcReadInit
# needs cd Desktop

#from adcRead_pkg import adcRead,adcReadInit
#   (only lets the program directly call the listed routines)

# or
#from adcRead_pkg import *
#    (lets the program directly call any of the routines in the pkg)

# or
#import adcRead_pkg
#    (to call any imported routine in the pkg using this syntax,
#     its name must be preceded by "adcRead_pkg." )

from adcRead_pkg import adcRead,adcReadInit   #(actually its name is adcRead_pkg.py)

#needs to be run as >$ python3 adcRead_test.py


if __name__ == "__main__":
    print("adcRead_pkg.py and adcRead_test.py must be in /Desktop")

    print("from adcRead_pkg import adcRead,adcReadInit")       # is needed
#                                NB cannot use path prefixes in the above

    print(" python2 or 3 will create adcRead_pkg.pyc")
    print(">$ cd /home/pi/Desktop")           # from this directory
    print(">$ python3 n.py <adcRead_pkg.py")  # will show that adcRead
    print(">$ python3 adcRead_test.py")       # runs the adc program 
    print(">$ ctrl+c will exit") 

    progName="adcRead_test.py"     #this is the main program to test adcRead()
    print("starting:"+progName)

    # These 9 parameters are also defined in 
    #    adcRead_pkg.py:
    #    mydo_1()
    RESET_ADDRESS = 0b0000000
    RESET_COMMAND = 0b00000110
    POINTER_CONVERSION = 0x0
    POINTER_CONFIGURATION  = 0x1
    POINTER_LOW_THRESHOLD  = 0x2
    POINTER_HIGH_THRESHOLD = 0x3
    DEVICE_ADDRESS = 0x48        # device address selected on the IC chip
    icNumber = "ADS1115"         # IC chip used
    I2C_BUS = 1                  # BUS number used by the IC chip
    # above constants are used with the ADS1115 IC chip:
    # [they could be defined as global variables in adcRead_init() instead]

    # These 2 constants must be defined in the test_adcRead.py program
    dT = .1                # sleep time between readings (set by the user of this program)
    nChannel = 2          # AINn is the analog pin # to read on the ADS1115 IC chip

    #                     # more than 1 channel can be read by the program 
    #                     # simply use adcRead(nChannel) where nChannel is the channel to read

    # usage of global variables
    # global g_adcValue

    # this variable can be referenced (seen) by any program using adcRead()
    # it always contains the most-recent-value read by adcRead()

    #create the BUS object

    BUS = adcReadInit(I2C_BUS,icNumber)
    BUS.open(I2C_BUS)

    while True :                            # loop
        value = adcRead(BUS,nChannel)           # reading nChannel of the ADS1115 once
        AINn="AIN"+str(nChannel)
        AINn=AINn.strip(" ")
        print ("value of "+AINn+" reading:", value)
        if dT==0 :
            break        #out of while loop # dT=0 will only read it once
        else:
            time.sleep(dT)                  # dT>0 will read it continuously
        #if end
    #while end
#end adcRead_test.py