Question

我在Raspberry Pi 3 B +上运行python3.5。带有显示屏。

我的项目正在使用一个简单的加速度计来打印其值。我遵循以下tutorial：我什至在将Pi与显示器一起使用时，甚至在dtoverlay=spi1-3cs的末尾添加了/boot/config.txt以激活另一个硬件SPI端口。

我正在尝试运行以下代码，并出现以下错误。

我已经跑过i2cdetect -y -1。它显示了一个地址为1d的设备。

我已经检查了我的连接和所有内容，不确定自己在做什么错。

    # Simple demo of reading the MMA8451 orientation every second.
# Author: Tony DiCola
import time

import board
import busio
import adafruit_mma8451
# Initialize I2C bus.
i2c = busio.I2C(board.SCL, board.SDA)

# Initialize MMA8451 module.
sensor = adafruit_mma8451.MMA8451(i2c)
# Optionally change the address if it's not the default:
##sensor = adafruit_mma8451.MMA8451(i2c, address=0x1d)

# Main loop to print the acceleration and orientation every second.
while True:
    x, y, z = sensor.acceleration
    print('Acceleration: x={0:0.3f}m/s^2 y={1:0.3f}m/s^2 z={2:0.3f}m/s^2'.format(x, y, z))
    orientation = sensor.orientation

    print('Orientation: ', end='')
    if orientation == adafruit_mma8451.PL_PUF:
        print('Portrait, up, front')
    elif orientation == adafruit_mma8451.PL_PUB:
        print('Portrait, up, back')
    elif orientation == adafruit_mma8451.PL_PDF:
        print('Portrait, down, front')
    elif orientation == adafruit_mma8451.PL_PDB:
        print('Portrait, down, back')
    elif orientation == adafruit_mma8451.PL_LRF:
        print('Landscape, right, front')
    elif orientation == adafruit_mma8451.PL_LRB:
        print('Landscape, right, back')
    elif orientation == adafruit_mma8451.PL_LLF:
        print('Landscape, left, front')
    elif orientation == adafruit_mma8451.PL_LLB:
        print('Landscape, left, back')
    time.sleep(1.0)

错误如下：

Traceback (most recent call last):
  File "simpletest.py", line 15, in <module>
    sensor = adafruit_mma8451.MMA8451(i2c)
  File "/usr/local/lib/python3.5/dist-packages/adafruit_mma8451.py", line 103, in __init__
    while self._read_u8(_MMA8451_REG_CTRL_REG2) & 0x40 > 0:
  File "/usr/local/lib/python3.5/dist-packages/adafruit_mma8451.py", line 134, in _read_u8
    self._read_into(address, self._BUFFER, count=1)
  File "/usr/local/lib/python3.5/dist-packages/adafruit_mma8451.py", line 130, in _read_into
    in_end=count, stop=False)
  File "/usr/local/lib/python3.5/dist-packages/adafruit_bus_device/i2c_device.py", line 149, in write_then_readinto
    in_start=in_start, in_end=in_end, stop=stop)
  File "/home/pi/.local/lib/python3.5/site-packages/busio.py", line 68, in writeto_then_readfrom
    in_start=in_start, in_end=in_end, stop=stop)
  File "/home/pi/.local/lib/python3.5/site-packages/adafruit_blinka/microcontroller/generic_linux/i2c.py", line 63, in writeto_then_readfrom
    readin = self._i2c_bus.read_i2c_block_data(address, buffer_out[out_start:out_end][0], in_end-in_start)
  File "/home/pi/.local/lib/python3.5/site-packages/Adafruit_PureIO/smbus.py", line 215, in read_i2c_block_data
    ioctl(self._device.fileno(), I2C_RDWR, request)
OSError: [Errno 121] Remote I/O error

Answer 1

我的Pi和加速度计存在相同的问题-使用i2cdetect时会显示设备，但无法使用Adafruit的代码或i2cget获取数据。 i2cdump显示垃圾/损坏的数据。解决的办法是Pi和加速度计之间的接地线有故障。解决此问题后，设备将正确响应。

mma8451加速度计给出我的Raspberry Pi osError [Errno 121]远程I / O错误

1 个答案: