Created
August 25, 2017 11:49
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RaspberryPi
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# -*- coding: utf-8 -*- | |
import RPi.GPIO as GPIO | |
from time import sleep | |
############################### | |
# MCP3208からSPI通信で12ビットのデジタル値を取得。0から7の8チャンネル使用可 | |
############################### | |
def readadc(adcnum, clockpin, mosipin, misopin, cspin): | |
if adcnum > 7 or adcnum < 0: | |
return -1 | |
GPIO.output(cspin, GPIO.HIGH) | |
GPIO.output(clockpin, GPIO.LOW) | |
GPIO.output(cspin, GPIO.LOW) | |
commandout = adcnum | |
commandout |= 0x18 # スタートビット+シングルエンドビット | |
commandout <<= 3 # LSBから8ビット目を送信するようにする | |
for i in range(5): | |
# LSBから数えて8ビット目から4ビット目までを送信 | |
if commandout & 0x80: | |
GPIO.output(mosipin, GPIO.HIGH) | |
else: | |
GPIO.output(mosipin, GPIO.LOW) | |
commandout <<= 1 | |
GPIO.output(clockpin, GPIO.HIGH) | |
GPIO.output(clockpin, GPIO.LOW) | |
adcout = 0 | |
# 13ビット読む(ヌルビット+12ビットデータ) | |
for i in range(13): | |
GPIO.output(clockpin, GPIO.HIGH) | |
GPIO.output(clockpin, GPIO.LOW) | |
adcout <<= 1 | |
if i>0 and GPIO.input(misopin)==GPIO.HIGH: | |
adcout |= 0x1 | |
GPIO.output(cspin, GPIO.HIGH) | |
return adcout | |
GPIO.setmode(GPIO.BCM) | |
# ピンの名前を変数として定義 | |
SPICS = 8 | |
SPIMISO = 9 | |
SPIMOSI = 10 | |
SPICLK = 11 | |
# SPI通信用の入出力を定義 | |
GPIO.setup(SPICLK, GPIO.OUT) | |
GPIO.setup(SPIMOSI, GPIO.OUT) | |
GPIO.setup(SPIMISO, GPIO.IN) | |
GPIO.setup(SPICS, GPIO.OUT) | |
try: | |
while True: | |
inputVal0 = readadc(0, SPICLK, SPIMOSI, SPIMISO, SPICS) | |
print(inputVal0) | |
sleep(0.2) | |
except KeyboardInterrupt: | |
pass | |
GPIO.cleanup() |
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