import datetime
import serial

port = '/dev/cu.usbserial-1420'
baud_rate = 9600
print(baud_rate)
arduino = serial.Serial(port, baudrate=baud_rate, timeout=.1)

expected = 1024

print("--------------------------------")
while True:
    while True:
        if (arduino.read() == b'A'):
            break
            
    count = 0
    startTime = datetime.datetime.now()
    while True:
        r = arduino.read()
        if (r == b'2'):
            count += 1
        else:
            break;
    endTime = datetime.datetime.now()
    deltaTime = endTime - startTime
    executionTime = deltaTime.total_seconds() * 1000
    print("count for this run: ", count)
    if (r != b'Z'):
        print("run ended with wrong end marker")
    if (count == expected):
        print("\t--> correct count")
    else:
        print("\t--> incorrect count")
    print("\t--> duration: ", round(executionTime,1), "ms")
    print("--------------------------------")
    expected += 2*1024