Noob guide - Githubissues

fullphat commented 7 years ago

I have everything installed, but I'm struggling with the command-line options and receive this error each time:

Traceback (most recent call last): File "demo.py", line 16, in from demo_opts import device File "/home/pi/luma.examples/examples/demo_opts.py", line 12, in import luma.core.emulator ImportError: No module named luma.core.emulator

Any chance of a walkthrough using the PCD8544 LCD as an example?

Thanks

rm-hull commented 7 years ago

Is this on Kali Linux or Raspian?
Is this a Raspberry Pi or some other small board computer?
How did you install the libs, through pip or python setup.py install in each of the projects
What version of pip?
What packages are installed? (pip list)

fullphat commented 7 years ago

Hi, sorry...

Raspbian Jesse Raspberry Pi 2 Used pip to install

pi@study:~ $ pip -V pip 1.5.6 from /usr/lib/python2.7/dist-packages (python 2.7)

pi@study:~ $ pip list argparse (1.2.1) bitarray (0.8.1) chardet (2.3.0) colorama (0.3.2) gpiozero (1.3.1) html5lib (0.999) luma.core (0.1.12-) luma.lcd (0.2.0) luma.led-matrix (0.3.3) luma.oled (2.1.0) lxkeymap (0.1) mcpi (0.1.1) ndg-httpsclient (0.3.2) numpy (1.8.2) olefile (0.44) pcd8544 (0.1.0) picamera (1.12) pifacecommon (4.2.1) pifacedigitalio (3.1.0) pigpio (1.30) Pillow (4.0.0) pip (1.5.6) pyasn1 (0.1.7) pyephem (3.7.6.0) pyfiglet (0.7.5) pygame (1.9.2a0) pygobject (3.14.0) pyOpenSSL (0.13.1) pyserial (2.6) python-apt (0.9.3.12) requests (2.4.3) rpi-ws281x (2.0.3) RPi.GPIO (0.6.3) RTIMULib (7.2.1) sense-hat (2.2.0) setuptools (5.5.1) six (1.8.0) smbus2 (0.1.4) spidev (3.3) unicornhat (2.1.2) urllib3 (1.9.1) wheel (0.24.0) wiringpi (2.32.1) wiringpi2 (2.32.3) wsgiref (0.1.2)

rm-hull commented 7 years ago

Ok, two things stand out

the default version of pip is quite old (I'm on 9.0.1 here).
there's something a bit odd in luma.core (0.1.12-) ...there shouldn't be a dash ('-') after the 0.1.12; let me check how the release was built

Can you try:

$ sudo pip uninstall luma.core luma.lcd luma.oled luma.led_matrix

Answer yes if if asks you to proceed

Then:

$ sudo pip install --upgrade pip
$ pip --version

To verify you are on the latest version, then do:

$ sudo pip install luma.led_matrix luma.lcd luma.oled
$ pip list

And paste the results again, and then try the examples again

fullphat commented 7 years ago

Ok, done! pip looks like it's upgraded ok:

Successfully installed pip
Cleaning up...
pi@study:~ $ pip --version
pip 9.0.1 from /usr/local/lib/python2.7/dist-packages (python 2.7)

And here's the results of pip list:

pi@study:~ $ pip list
DEPRECATION: The default format will switch to columns in the future. You can use --format=(legacy|columns) (or define a format=(legacy|columns) in your pip.conf under the [list] section) to disable this warning.
bitarray (0.8.1)
chardet (2.3.0)
colorama (0.3.2)
gpiozero (1.3.1)
html5lib (0.999)
luma.core (0.1.12)
luma.lcd (0.2.0)
luma.led-matrix (0.3.3)
luma.oled (2.1.0)
lxkeymap (0.1)
mcpi (0.1.1)
ndg-httpsclient (0.3.2)
numpy (1.8.2)
olefile (0.44)
pcd8544 (0.1.0)
picamera (1.12)
pifacecommon (4.2.1)
pifacedigitalio (3.1.0)
pigpio (1.30)
Pillow (4.0.0)
pip (9.0.1)
pyasn1 (0.1.7)
pyephem (3.7.6.0)
pyfiglet (0.7.5)
pygame (1.9.2a0)
pygobject (3.14.0)
pyOpenSSL (0.13.1)
pyserial (2.6)
python-apt (0.9.3.12)
requests (2.4.3)
rpi-ws281x (2.0.3)
RPi.GPIO (0.6.3)
RTIMULib (7.2.1)
sense-hat (2.2.0)
setuptools (5.5.1)
six (1.8.0)
smbus2 (0.1.4)
spidev (3.3)
unicornhat (2.1.2)
urllib3 (1.9.1)
wheel (0.24.0)
wiringpi (2.32.1)
wiringpi2 (2.32.3)

Different error this time!

pi@study:~/luma.examples/examples $ ./demo.py --display pcd8544
usage: demo.py [-h] [--config CONFIG]
               [--display {ssd1306,ssd1325,ssd1331,sh1106,pcd8544,max7219,capture,pygame,gifanim}]
               [--width WIDTH] [--height HEIGHT] [--rotate {0,1,2,3}]
               [--interface {i2c,spi}] [--i2c-port I2C_PORT]
               [--i2c-address I2C_ADDRESS] [--spi-port SPI_PORT]
               [--spi-device SPI_DEVICE] [--spi-bus-speed SPI_BUS_SPEED]
               [--bcm-data-command BCM_DATA_COMMAND] [--bcm-reset BCM_RESET]
               [--bcm-backlight BCM_BACKLIGHT]
               [--transform {none,identity,scale2x,smoothscale,led_matrix,seven_segment}]
               [--scale SCALE] [--mode {1,RGB,RGBA}] [--duration DURATION]
               [--loop LOOP] [--max-frames MAX_FRAMES]
demo.py: error: SPI device not found

fullphat commented 7 years ago

So, after enabling SPI (oops...) and rebooting, the demos now work, although I can't see anything displayed.

If it helps at all, these: https://github.com/XavierBerger/pcd8544 didn't work either, but now do run, but don't display anything either! Fearing something rather bad had happened, I tested these: http://binerry.de/post/25787954149/pcd8544-library-for-raspberry-pi and they work fine.

Hope this helps!

rm-hull commented 7 years ago

If you've followed http://binerry.de/post/25787954149/pcd8544-library-for-raspberry-pi and wired it up like that then then this would explain why it doesn't work with this library.

Follow the wiring diagram in http://luma-lcd.readthedocs.io/en/latest/hardware.html#pre-requisites (Pay particular heed of the warning in the text though, as the layout of the pins can differ from device to device; if in doubt, take a photo of the breakout board and drag the .jpg to the input box of this issue -- it will upload it for you), then create a file called pcd8544.conf with the content as follows:

--display=pcd8544
--interface=spi
--spi-bus-speed=32000000
--bcm-reset=24
--bcm-data-command=23
--bcm-backlight=18
--width=84
--height=48

Then invoke an example as follows:

$ examples/demo.py -f pcd8544.conf

fullphat commented 7 years ago

Ah, sorry - I should explain that I've not actually wired it up myself - it came as a sealed unit (https://www.amazon.co.uk/SunFounder-Raspberry-PCD8544-Backlight-Compatible/dp/B01GPV7M1W/ref=sr_1_1?ie=UTF8&qid=1485198921&sr=8-1&keywords=pcd8544)

Still no dice using that conf file though I'm afraid...

fullphat commented 7 years ago

Further update. Found this page: http://www.sunfounder.com/wiki/index.php?title=Raspberry_Pi_5110_Mini_LCD_84*48_PCD8544_Usage which obviously covers the specific board/setup I have. I followed the instructions and it displayed the test image correctly. The text states this board doesn't use SPI at all, so won't I be able to use your library?

rm-hull commented 7 years ago

So, unfortunately that unit is not going to work with this library as-is*, looking at the back (as below) it is hardwired to use GP0-4, none of which are SPI ports. It appears to be using the I2C pins, but probably configured as GPIO pins.

The binerry software looks like it does software bit-banging to emulate SPI protocol.

_* - it would be possible to write a software SPI bitbang (along the lines of https://github.com/adafruit/Adafruit_Python_GPIO/blob/master/Adafruit_GPIO/SPI.py#L150), but it would be slow in pure python - I can't promise anything, but feel free to raise a request in the issues on luma.core_

fullphat commented 7 years ago

Understood - thanks for your efforts. I may try to make some progress using the Adafruit library at least so I can see how far I can get with it. :)

thijstriemstra commented 7 years ago

I haven't tested the luma.led_matrix library yet but it should be good to go @rm-hull (and otherwise I'll file a ticket)?

rm-hull / luma.examples

Noob guide #7