A Python script to read MCP3208 via spi0.0 on Jetson Nano

raspimouse_read_mcp3208_via_spidev.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

# raspimouse_read_mcp3208_via_spidev.py
# (C) 2020 Daisuke Sato@RT CORPORATION
# Released under the MIT License
# special thanks: https://www.denshi.club/pc/raspi/5raspberry-pi-zeroiot8a-d5mcp3208.html

import time
import spidev
import Jetson.GPIO as GPIO

def main():
    Vref = 3.3
    
    spi = spidev.SpiDev()
    spi.open(0,0) #port 0,cs 0
    spi.max_speed_hz = 1000000 # 1MHz
    
    channels = [15, 29, 13, 11] #R, L, RF, LF
    GPIO.setmode(GPIO.BOARD)
    GPIO.setup(channels, GPIO.OUT)
    GPIO.output(channels, GPIO.LOW)

    # channel 0, l
    GPIO.output(29, GPIO.HIGH)
    time.sleep(0.05)
    adc0 = spi.xfer2([0x06,0x00,0x00])
    GPIO.output(29, GPIO.LOW)
    # channel 1, lf
    GPIO.output(11, GPIO.HIGH)
    time.sleep(0.05)
    adc1 = spi.xfer2([0x06,0x40,0x00])
    GPIO.output(11, GPIO.LOW)
    # channel 2, rf
    GPIO.output(13, GPIO.HIGH)
    time.sleep(0.05)
    adc2 = spi.xfer2([0x06,0x80,0x00])
    GPIO.output(13, GPIO.LOW)
    # channel 3, r
    GPIO.output(15, GPIO.HIGH)
    time.sleep(0.05)
    adc3 = spi.xfer2([0x06,0xc0,0x00])
    GPIO.output(15, GPIO.LOW)

    data = ((adc0[1] & 0x0f) << 8) | adc0[2]
    print ("ch0(L ) " + str(Vref*data/4096) + "V")
    data = ((adc1[1] & 0x0f) << 8) | adc1[2]
    print ("ch1(LF) " + str(Vref*data/4096) + "V")
    data = ((adc2[1] & 0x0f) << 8) | adc2[2]
    print ("ch2(RF) " + str(Vref*data/4096) + "V")
    data = ((adc3[1] & 0x0f) << 8) | adc3[2]
    print ("ch3(R ) " + str(Vref*data/4096) + "V")
    
    GPIO.cleanup(channels)
    spi.close()

if __name__ == '__main__':
    main()