Syntax error

[Ascottgent]

I have successfully run code to operate LEDs and relays. My latest effort is to run Hall sensor using an ADC unit. The code is published by SunFounder and having written it in the Idle editor I have reached a problem having ensured that there are no tabs and correct indentation have been used. However, when I reach the program start code line if __name__ == '__main__': the editor keeps giving the : as a syntax error. This code line I have used in other successful programs. Attached is the program:

Code: Select all

#!/usr/bin/env python
#-----------------------------------------------------
#
#       This is a program for all ADC Module. It 
#   convert analog singnal to digital signal.
#
#       This program is most analog signal modules' 
#   dependency. Use it like this:
#       `import ADC0832`
#       `sig = ADC0832.getResult(chn)`
#
#   *'chn' should be 0 or 1 represent for ch0 or ch1
#   on ADC0832
#       
#         ACD1302                 Pi
#           CS ---------------- Pin 11
#           CLK --------------- Pin 12
#           DI ---------------- Pin 13

#           VCC ----------------- 3.3V
#           GND ------------------ GND
#
#-----------------------------------------------------
import RPi.GPIO as GPIO
import time

ADC_CS  = 11
ADC_CLK = 12
ADC_DIO = 13

# using default pins for backwards compatibility
def setup(cs=11,clk=12,dio=13):
        global ADC_CS, ADC_CLK, ADC_DIO
        ADC_CS=cs
        ADC_CLK=clk
        ADC_DIO=dio
GPIO.setwarnings(False)
GPIO.setmode(GPIO.BOARD)            # Number GPIOs by its physical location
GPIO.setup(ADC_CS, GPIO.OUT)        # Set pins' mode is output
GPIO.setup(ADC_CLK, GPIO.OUT)       # Set pins' mode is output

def destroy():
    GPIO.cleanup()

# using channel = 0 as default for backwards compatibility
def getResult(channel=0):                   # Get ADC result, input channal
        GPIO.setup(ADC_DIO, GPIO.OUT)
        GPIO.output(ADC_CS, 0)
        
        GPIO.output(ADC_CLK, 0)
        GPIO.output(ADC_DIO, 1);  time.sleep(0.000002)
        GPIO.output(ADC_CLK, 1);  time.sleep(0.000002)
        GPIO.output(ADC_CLK, 0)
    
        GPIO.output(ADC_DIO, 1);  time.sleep(0.000002)
        GPIO.output(ADC_CLK, 1);  time.sleep(0.000002)
        GPIO.output(ADC_CLK, 0)
    
        GPIO.output(ADC_DIO, channel);  time.sleep(0.000002)
    
        GPIO.output(ADC_CLK, 1)
        GPIO.output(ADC_DIO, 1);  time.sleep(0.000002)
        GPIO.output(ADC_CLK, 0)
        GPIO.output(ADC_DIO, 1);  time.sleep(0.000002)
    
        dat1 = 0
        for i in range(0, 8):
            GPIO.output(ADC_CLK, 1);  time.sleep(0.000002)
            GPIO.output(ADC_CLK, 0);  time.sleep(0.000002)
            GPIO.setup(ADC_DIO, GPIO.IN)
            dat1 = dat1 << 1 | GPIO.input(ADC_DIO)  
        
        dat2 = 0
        for i in range(0, 8):
            dat2 = dat2 | GPIO.input(ADC_DIO) << i
            GPIO.output(ADC_CLK, 1);  time.sleep(0.000002)
            GPIO.output(ADC_CLK, 0);  time.sleep(0.000002)
        
        GPIO.output(ADC_CS, 1)
        GPIO.setup(ADC_DIO, GPIO.OUT)

        if dat1 == dat2:
            return dat1
        else:
            return 0

def getResult1():
    return getResult(1)


def loop():
        while True:
            res0 = getResult(0)
            res1 = getResult(1)
            print('res0 = %d, res1 = %d') % (res0,res1)
            time.sleep(0.4)

if __name__ == '__main__':      # Program start from here
    setup()
    try:
        loop()
    except:
            KeyboardInterrupt
        
            destroy()

Any help appreciated

Ascottgent

[B.Goode]

That line looks correct to me.

This sort of situation usually means there is a previously undetectable error earlier in the script.

Is the print statement correct?

[gordon77]

Your script shows no errors on my pi.