Raspberry Pi MAX31865 Python 到 Java 的转换

Question

我正在尝试将读取 MAX13865 传感器的一段 Python 代码转换为 Java。Python 代码运行良好并返回预期的数字 (1238)，而 Java 版本始终返回 32767。为了简化阅读，我将 Python 代码和 Java 代码减少到最小。下面的 Python 代码仍然运行得很好。我缺少什么？看起来很简单，但是还是不行……

#!/usr/bin/python -tt

import RPi.GPIO as GPIO

import time

import datetime

import math

class MAX31865(object):

    def __init__(self, cs_pin, clock_pin, data_in_pin, data_out_pin, board = GPIO.BCM):

        self.cs_pin = cs_pin

        self.clock_pin = clock_pin

        self.data_in_pin = data_in_pin

        self.data_out_pin = data_out_pin

        self.board = board

        # Initialize needed GPIO

        GPIO.setmode(self.board)

        GPIO.setup(self.cs_pin, GPIO.OUT)

        GPIO.setup(self.clock_pin, GPIO.OUT)

        GPIO.setup(self.data_in_pin, GPIO.IN)

        GPIO.setup(self.data_out_pin, GPIO.OUT)

        # Pull chip select high to make chip inactive

        GPIO.output(self.cs_pin, GPIO.HIGH)

    def get_data(self):

        '''Acqures raw RDT data.'''

        self.address = int(0x01)    #RTD MSBs

        MSB = self.read()

        self.address = int(0x02)    #RTD LSBs

        LSB = self.read()

        MSB = MSB<<8

        raw = MSB+LSB

        raw = raw>>1

        return raw

    def read(self):

        '''Reads 16 bits of the SPI bus from a self.address register & stores as an integer in self.data.'''

        bytesin = 0

        # Select the chip

        GPIO.output(self.cs_pin, GPIO.LOW)

        # Assert clock bit

        GPIO.output(self.clock_pin, GPIO.LOW)

        # Write to address

        for i in range(8):

            bit  = self.address>>(7 - i)

            bit = bit & 1

            GPIO.output(self.data_out_pin, bit)

            GPIO.output(self.clock_pin, GPIO.HIGH)

            GPIO.output(self.clock_pin, GPIO.LOW)

        # Read in 8 bits

        for i in range(8):

            GPIO.output(self.clock_pin, GPIO.HIGH)

            bytesin = bytesin << 1

            if (GPIO.input(self.data_in_pin)):

                bytesin = bytesin | 1

            GPIO.output(self.clock_pin, GPIO.LOW)

Answer 1

问题与 Pi4J 映射 GPIO 引脚号与 Python 版本的方式有关。https://www.pi4j.com/1.2/pins/model-3b-rev1.htmlPython版本：MAX31865(8,&nbsp;11,&nbsp;9,&nbsp;10)以及 java 的等价物：MAX31865&nbsp;max&nbsp;=&nbsp;new&nbsp;MAX31865(RaspiPin.GPIO_10,&nbsp;RaspiPin.GPIO_14,&nbsp;RaspiPin.GPIO_13,&nbsp;RaspiPin.GPIO_12);请注意，引脚编号不同。但现在两者给出了完全相同的结果。其他一切都很好。实时调频:(