PI 3 & Jessie Serial Problems

[shadesofginger]

I am trying to use the Adafruit BNO055 board using their provided python code. it keeps having trouble with the serial port and frantic googling and serveral wipe cleans and start agains haven't made it work as of yet. Here is a list of operations i have done (after wipe) in order
sudo apt-get update
sudo apt-get upgrade
sudo apt-get dist-upgrade
sudo rpi - update
sudo reboot
sudo nano /boot/config.txt (added dtoverlay=pi3-miniuart-bt at the end of file)
sudo reboot
sudo nano /boot/cmdline.txt (would have edited but didn't need to)
sudo systemctl disable hicuart
sudo reboot
sudo systemctl disable serial-getty@ttyAMA0.service
sudo reboot
then all adafuruit software downloaded using the guide on their website ( https://learn.adafruit.com/bno055-absol ... k/software ) however when i run the simpletest.py i get the error:
serial.serialutil.SerialExeption: could not open port /dev/ttyAMA0: [Errno 2] No such file or directory: '/dev/ttyAMA0'

what going on?!

[HawaiianPi]

That's because the serial port on the Pi3 is being used by Bluetooth, and the GPIO serial pins are now connected to a mini-UART.

Try either of these (not both) in your config.txt file. Add the following and remove the "#" comment character from whichever one you want to try.

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# UART and Bluetooth settings for the Raspberry Pi3
#pi3-disable-bt	   #(turn off Bluetooth and restore serial0 UART)
#pi3-miniuart-bt     #(set Bluetooth to use the mini-UART and restore serial0 UART)

[SonOfAMotherlessGoat]

And to make sure you're future proof, change the `/dev/ttyAMA0` references to `/dev/serial0`. It should be linked already for you in the meantime.

[Daveawalker]

This is a very important point.....
Try either of these (not both) in your config.txt file.
I had both, and it confused me I got coms when running a python script from the command line BUT it would not communicate when in autostart...

[mwilson1207]

I'm trying to use the same sensor with a raspberry pi zero and getting the following error:

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pi@raspberrypi:~ $ sudo python Adafruit_Python_BNO055/examples/simpletest.py 
Traceback (most recent call last):
  File "Adafruit_Python_BNO055/examples/simpletest.py", line 46, in <module>
    if not bno.begin():
  File "build/bdist.linux-armv6l/egg/Adafruit_BNO055/BNO055.py", line 382, in begin
  File "build/bdist.linux-armv6l/egg/Adafruit_BNO055/BNO055.py", line 358, in _config_mode
  File "build/bdist.linux-armv6l/egg/Adafruit_BNO055/BNO055.py", line 416, in set_mode
  File "build/bdist.linux-armv6l/egg/Adafruit_BNO055/BNO055.py", line 311, in _write_byte
  File "build/bdist.linux-armv6l/egg/Adafruit_BNO055/BNO055.py", line 267, in _serial_send
RuntimeError: Timeout waiting for serial acknowledge, is the BNO055 connected?

Do I need to do something differently for the pi zero?

[objectR]

did this ever get solved? I am running into the same issue (pi 2 though)

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[Errno 2] No such file or directory: '/dev/ttyAMA0'

[shadesofginger]

I'm trying to use the same sensor with a raspberry pi zero and getting the following error:

Code: Select all

pi@raspberrypi:~ $ sudo python Adafruit_Python_BNO055/examples/simpletest.py 
Traceback (most recent call last):
  File "Adafruit_Python_BNO055/examples/simpletest.py", line 46, in <module>
    if not bno.begin():
  File "build/bdist.linux-armv6l/egg/Adafruit_BNO055/BNO055.py", line 382, in begin
  File "build/bdist.linux-armv6l/egg/Adafruit_BNO055/BNO055.py", line 358, in _config_mode
  File "build/bdist.linux-armv6l/egg/Adafruit_BNO055/BNO055.py", line 416, in set_mode
  File "build/bdist.linux-armv6l/egg/Adafruit_BNO055/BNO055.py", line 311, in _write_byte
  File "build/bdist.linux-armv6l/egg/Adafruit_BNO055/BNO055.py", line 267, in _serial_send
RuntimeError: Timeout waiting for serial acknowledge, is the BNO055 connected?

Do I need to do something differently for the pi zero?

I have tried both the config add ons and they are giving me this error too despite the board being connected as the Adafruit diagrams shows. thoughts?

[objectR]

solved my problem, had to modify the /boot/config.txt
from

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enable_uart = 0  

to

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enable_uart = 1   

[shadesofginger]

tried changing to enable uart=1 and now all i get is a serial location error just as i stared with, any more suggestions?