UART Creation Problem

[jmpratt]

I have two Wipy 3.0s. The following code works fine on one, but on the other uart1 does not get created. I am putting these boards into the one hardware setup. The only difference is the boards themselves. Is there a hardware failure that would cause this error?

The REPL error is at the end of this post.

from machine import UART  #  for serial communication
from utime import sleep # For delaying in seconds, MicroPython version
import time



def sdi_setup():
    # initialize UART port to communicate with SDI-12 translator board
    uart1 = UART(1, baudrate=9600, pins=('P9','P10'))   # init with given UART port & baudrate (tx, rx)
    uart1.init(baudrate=9600, bits=8, parity=None, stop=1, pins=('P9','P10'), timeout_chars=10)  # init with given parameters
    
    print(uart1)
    global sdi_12_address
    # setup SDI-12 addresses.  Valid addresses are single character.
    sdi_12_address=''
    #user_sdi_12_address=input('Enter all SDI-12 sensor addresses, such as 1234:')
    user_sdi_12_address = '01'
    user_sdi_12_address=user_sdi_12_address.strip() # Remove any \r from an input file typed in windows
    for an_address in user_sdi_12_address:
        if ((an_address>='0') and (an_address<='9')) or ((an_address>='A') and (an_address<='Z')) or ((an_address>='a') and (an_address<='z')):
            print("Using address:",an_address);
            sdi_12_address=sdi_12_address+an_address
        else:
            print('Invalid address:',an_address)


def sensor_info():
    global sdi_12_address
    sensor_dict = {} # init dictionary to hold sensor info
    for an_address in sdi_12_address:
        # print(an_address+'I!')
        uart1.write(an_address+'I!')
        sleep(1)  #give time for sensor to respond
        sdi_12_line=uart1.readline().decode().strip()
        sensor_txt = 'Sensor address & info,' + an_address + ',' + sdi_12_line + '\n'
        print(sensor_txt)
        sensor_info=sdi_12_line.split(',') #  create list of values
        sensor_dict[an_address] = sensor_info #  store in dict, sensor address is the key
    print(sensor_dict)
    return sensor_dict

def sensor_measurement():
    measurement_dict = {}  # initialize dictionary to hold measurement values
    for j in sdi_12_address:
        str_j = str(j)
        uart1.write(str_j + 'M!')
        sleep(1) # keep at or above 1 second to ensure all respones from sensor are captured
        meas_delay = uart1.readall().decode().strip()  # read sensor response, time until ready
        meas_delay = meas_delay[len(str_j):]
        try:
            meas_delay = float(meas_delay[:3])
        except:
            meas_delay = 3
            print ('Delay exception')
        sleep(meas_delay) # sleep until measurement is ready
        uart1.write(str_j + 'D0!')  # tell sensor to send data
        sleep(.5)  # dealy to allow data to be sent to UART
        sensor_values = uart1.readall().decode().strip().replace('+',',') # read data
        now = time.localtime()
        time_stamp = "%04d/%02d/%02d,%02d:%02d:%02d" % (now[0], now[1], now[2], now[3], now[4], now[5])
        sensor_values=sensor_values.split(',') #  create list of values
        sensor_values.pop(0)  # remove sensor address from list
        sensor_values = [float(i) for i in sensor_values]  # clean data, convert to floats
        sensor_values.insert(0,time_stamp)  # add timestamp as first value of list
        measurement_dict[j] = sensor_values #  store in dict, sensor address is the key

    print(measurement_dict)
    return measurement_dict

if __name__ == "__main__":
    sdi_setup()
    sensor_info()
    sensor_measurement()

configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff8028,len:8
load:0x3fff8030,len:1728
load:0x4009fa00,len:0
load:0x4009fa00,len:14584
entry 0x400a059c
WLAN connected ip 192.168.1.52 gateway 192.168.1.1
SD card mounted
None
SD card found
2018-07-22T01:17:48+00:00
/sd/20180722.csv
UART(1, baudrate=9600, bits=8, parity=None, stop=1)
Using address: 0
Using address: 1
Traceback (most recent call last):
File "main.py", line 5, in <module>
File "/sd/sd_main.py", line 85, in <module>
File "/sd/measure.py", line 32, in sensor_info
NameError: name 'uart1' is not defined
Pycom MicroPython 1.18.0 [v1.8.6-849-046b350] on 2018-06-01; WiPy with ESP32
Type "help()" for more information.

[robert-hh]

@jmpratt I cannot believe that you have the same code on both WiPy's. Please reload the code to both devices, reset them and try.

[jmpratt]

@robert-hh Thanks. I'll rewrite that part of the code.

However, why would this code work on one WiPy and not the other? That makes me thing there is another, hardware specific issue.

[robert-hh]

@jmpratt The error tells that uart1 is not defined in sensor_info(), which is obvious, because it is not in scope. You may have to declare uart1 global in sdi_setup(), sensor_info() and sensor_measurement, like you did with sdi_12_address.

You may consider to put that all into a class, or hand over uart1 and sdi_12_address between the functions by return values and functions arguments. That make information passing more clear.