Comments (37)
ladyada
commented on July 24, 2024
Beaglebone black and pocket would be a great addition!
It shoudl be easy, I just don't have time with all the other things I'm doing right now :)
first step is adding platform detection
https://github.com/adafruit/Adafruit_Python_PlatformDetect
once that works, then you should be able to add a new board type (the chip is already defined since its the same as the BBB)
if you do it that would be great!
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s-light
commented on July 24, 2024
thanks for the fast feedback!
i will look into the PlatformDetect thing!
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ladyada
commented on July 24, 2024
sweet! @makermelissa may also be interested
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makermelissa
commented on July 24, 2024
Yup, I’m interested.
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s-light
commented on July 24, 2024
update → PlatformDetect already supports PocketBeagle:
$ ./detect.py
Chip id: AM33XX
Board id: BEAGLEBONE_POCKETBEAGLE
Is this a Pi 3B+? False
Is this a 40-pin Raspberry Pi? False
Is this a Beagle? True
Is this a BBB? False
Is this an Orange Pi PC? False
Is this a Giant Board? False
Is this an embedded Linux system? True
Is this a generic Linux PC? False
( i have added the Is this a Beagle? question in my copy of the detect.py just for testing..)
only problem currently is for reading the board id you need root privileges.
for this i opened a issue: adafruit/Adafruit_Python_PlatformDetect#20
(including a udev-based solution i found on the net)
i will have a look at adding a board tomorrow.
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makermelissa
commented on July 24, 2024
Awesome. You’re making great progress. I’ll get my pocket Beagle setup tonight so I can help test if you finish soon.
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s-light
commented on July 24, 2024
had to try it today ;-)
have a problem now -
currently the pin name assignment for SPI and I2C is done in the processor file:
microcontroller/am335x/pin.py#L203
but the header pin names are not common for the two boards - as they have fully different pin-header layouts.
example:
BeagleBoard Black has
CE0 = Pin('P9_17')
MOSI = Pin('P9_18')
MISO = Pin('P9_21')
SCLK = Pin('P9_22')
but for the PocketBeagle i would need
CE0 = Pin('P1_6')
MOSI = Pin('P1_12')
MISO = Pin('P1_10')
SCLK = Pin('P1_8')
how to do this? (i did not find a similar case in one of the other board mappings..)
PocketBeagle Pin-Header
BeagleBoard Black Pin-Header
i did not check the underlying / internal signal names yet -
but eventually it would make sens to use the internal names (like Mode0 Name) in the processor definitions file - if they are the same for the both board-types?!
and then use the board file to map these to the pin-header and common names(like MISO) ?!
looking forward for your thoughts & input ;-)
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ladyada
commented on July 24, 2024
yeah, we should have the PX_XX names in the chip, then the board defines the 'pretty names' - do you want to try that? we'll hvae to 'fix' BBB (but nobody is using it yet)
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s-light
commented on July 24, 2024
i will try.
should i do this in two separate pull requests or in one?
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ladyada
commented on July 24, 2024
one is fine - whatever you like!
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s-light
commented on July 24, 2024
additions are done.
pull-request is created.
but i have not tested anything yet. ;-)
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pdp7
commented on July 24, 2024
@s-light thanks for adding PocketBeagle to Blinka!
Now that Adafruit is distributing the PocketBeagle I'm sure there will be people interested in leveraging Blinka to utilize CircuitPython libraries. I think these changes make sense including moving the SPI and I2C pins to the board files.
I'll test out the BeagleBone Black and PocketBeagle with PR #101
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pdp7
commented on July 24, 2024
@s-light I have merged PR #101 and added an example to blink LED on PocketBeagle.
I think additional testing is needed to verify that I2C and SPI are working OK before this issue can be closed.
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s-light
commented on July 24, 2024
i have added PR #102
- some 'nice comments'
- added PocketBeagle I2C ports (see *1)
and also tested I2C with APDS9960 and the lib and the basic tests all went fine :-)
i have not tested SPI or UART.
*1: i don't fully understand how the libraries work here -
my feeling is that it is not really a clean way to use the P1_XX and P8_XX names in this port-lists...
but i don't know if they are any other names that are a better fit for the processor file....
on my quest to look for the internal processor names i went down a deep rabbit hole ;-)
- GPIO_nnn can not be used - as the lib does not recognize this for the special functions it seems.. (teste with the
Adafruit_BBIO.PWM..)
so decided to not think anymore about this for now.
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pdp7
commented on July 24, 2024
@s-light thanks for the update! I will review #102 and advise if I run into any issues. I'll also take at a look at i2cPorts, spiPorts and uartPorts and think about the best way to handle those between P1/P2 and P8/P9 versions.
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s-light
commented on July 24, 2024
i have pushed some more updates -
these are trying to get a more common pin-naming for the spi/i2c/uart (and other special function-names are also defined. but i don't know if they could get used ;-)
the simple blinkatest.py runs on my pocketbeagle all fine with both SPI and I2C pin definitions:
#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
simple test for adafruit-blinka.
https://learn.adafruit.com/circuitpython-on-raspberrypi-linux/installing-circuitpython-on-raspberry-pi
"""
import board
import digitalio
import busio
print("Hello blinka!")
# Try to great a Digital input
pin = digitalio.DigitalInOut(board.P1_2)
print("Digital IO ok!")
# Try to create an I2C device
i2c = busio.I2C(board.SCL, board.SDA)
print("I2C ok!")
i2c = busio.I2C(board.SCL_2, board.SDA_2)
print("I2C_2 ok!")
# Try to create an SPI device
spi = busio.SPI(board.SCLK, board.MOSI, board.MISO)
print("SPI ok!")
spi = busio.SPI(board.SCLK_1, board.MOSI_1, board.MISO_1)
print("SPI_1 ok!")
print("done!")
result:
debian@beaglebone:~/python_tests$ ./blinka_test.py
Hello blinka!
Digital IO ok!
I2C ok!
I2C_2 ok!
SPI ok!
SPI_1 ok!
done!
debian@beaglebone:~/python_tests$
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s-light
commented on July 24, 2024
today i tried and tested spi with an actual hardware:
i used an
i uploaded my test-script oled_display.py
but this does not work as expected:
debian@beaglebone:~/pocketbeagle_python_tests$ ./oled_display.py
oled display tests
setup spi
setup digitalio
init SSD1306_SPI
Could not open SPI device - check if SPI is enabled in kernel!
Traceback (most recent call last):
File "./oled_display.py", line 43, in <module>
display = adafruit_ssd1306.SSD1306_SPI(128, 32, spi, pin_dc, pin_rst, pin_cs)
File "/home/debian/.local/lib/python3.5/site-packages/adafruit_ssd1306.py", line 222, in __init__
external_vcc=external_vcc, reset=reset)
File "/home/debian/.local/lib/python3.5/site-packages/adafruit_ssd1306.py", line 81, in __init__
self.poweron()
File "/home/debian/.local/lib/python3.5/site-packages/adafruit_ssd1306.py", line 142, in poweron
self.write_cmd(SET_DISP | 0x01)
File "/home/debian/.local/lib/python3.5/site-packages/adafruit_ssd1306.py", line 228, in write_cmd
spi.write(bytearray([cmd]))
File "/home/debian/Adafruit_Blinka/src/busio.py", line 129, in write
return self._spi.write(buf, start, end)
File "/home/debian/Adafruit_Blinka/src/adafruit_blinka/microcontroller/generic_linux/spi.py", line 39, in write
self._spi.open(self._port, 0)
FileNotFoundError: [Errno 2] No such file or directory
debian@beaglebone:~/pocketbeagle_python_tests$
i had first to fix the pin-mode. and also checked this:
debian@beaglebone:~/pocketbeagle_python_tests$ config-pin -q P1_6
P1_06 Mode: spi_cs
debian@beaglebone:~/pocketbeagle_python_tests$ config-pin -q P1_8
P1_08 Mode: spi_sclk
debian@beaglebone:~/pocketbeagle_python_tests$ config-pin -q P1_10
P1_10 Mode: spi
debian@beaglebone:~/pocketbeagle_python_tests$ config-pin -q P1_12
P1_12 Mode: spi
i also tried with sudo - but this did not change anything (i installed the libraries as both - sudo and non sudo)
so it seems there is something other wrong with this currently...
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s-light
commented on July 24, 2024
regarding the pin names i just found #62 and specially tannewts comment #62 (comment)
so i think i was on the wrong track with my namings in the different files :-(
(i wanted to do it more the opposite way :-p )
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pdp7
commented on July 24, 2024
I have installed the branch for #102 on my PB and run the examples/pb_digitalio.py OKAY.
There does not seem to be any regressions so I will merge this to avoid having a large changeset in the future.
I think there is still more testing to do for BeagleBone and PocketBeagle including adding more example scripts (or maybe even use pytest like in Adafruit_BBIO) to make it easier to spot regressions.
I think that we may need to refactor how I2C and SPI are handled given the different header schemes. I'll post a followup comment with more thoughts about that.
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pdp7
commented on July 24, 2024
@s-light Thanks for creating the PocketBeagle tests repo! They look very useful and I think are good candidates to include in the Adafruit_Blinka examples directory. Maybe they could even be improved to test both PocketBeagle and BeagleBone.
Regarding FileNotFoundError error in oled_display.py:
Could you try running oled_display.py again with trace so we can tell the file path that is not found?
For example, running blinka_test.py with strace:
debian@beaglebone:~/pocketbeagle_python_tests$ strace -o /tmp/strace python3 ./blinka_test.py
Hello blinka!
Digital IO ok!
I2C ok!
I2C_2 ok!
SPI ok!
SPI_1 ok!
done!
debian@beaglebone:~/pocketbeagle_python_tests$ /opt/scripts/tools/version.sh xc^C
debian@beaglebone:~/pocketbeagle_python_tests$ egrep '(/sys/|/dev/)' /tmp/strace |grep -v nvmem
connect(3, {sa_family=AF_UNIX, sun_path="/dev/log"}, 110) = 0
access("/sys/class/gpio/gpio87", R_OK|W_OK|X_OK) = 0
open("/sys/class/gpio/gpio87/direction", O_WRONLY) = 4
open("/sys/devices/platform/ocp/ocp:P1_02_pinmux/state", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 4
open("/sys/class/gpio/gpio87/direction", O_WRONLY) = 4
open("/sys/devices/platform/ocp/ocp:P1_02_pinmux/state", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 4
open("/dev/i2c-1", O_RDWR|O_LARGEFILE|O_CLOEXEC) = 4
open("/dev/i2c-2", O_RDWR|O_LARGEFILE|O_CLOEXEC) = 5
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pdp7
commented on July 24, 2024
@s-light don't have an OLED with me, but I was able to get the same error and run strace:
debian@beaglebone:~/pocketbeagle_python_tests$ strace -o /tmp/oled.out python3 ./oled_display.py
oled display tests
setup spi
setup digitalio
init SSD1306_SPI
Could not open SPI device - check if SPI is enabled in kernel!
Traceback (most recent call last):
File "./oled_display.py", line 43, in <module>
display = adafruit_ssd1306.SSD1306_SPI(128, 32, spi, pin_dc, pin_rst, pin_cs)
File "/usr/local/lib/python3.5/dist-packages/adafruit_circuitpython_ssd1306-2.6.2-py3.5.egg/adafruit_ssd1306.py", line 222, in __init__
File "/usr/local/lib/python3.5/dist-packages/adafruit_circuitpython_ssd1306-2.6.2-py3.5.egg/adafruit_ssd1306.py", line 81, in __init__
File "/usr/local/lib/python3.5/dist-packages/adafruit_circuitpython_ssd1306-2.6.2-py3.5.egg/adafruit_ssd1306.py", line 142, in poweron
File "/usr/local/lib/python3.5/dist-packages/adafruit_circuitpython_ssd1306-2.6.2-py3.5.egg/adafruit_ssd1306.py", line 228, in write_cmd
File "/usr/local/lib/python3.5/dist-packages/Adafruit_Blinka-1.2.9.dev23+g1d32b1f-py3.5.egg/busio.py", line 129, in write
return self._spi.write(buf, start, end)
File "/usr/local/lib/python3.5/dist-packages/Adafruit_Blinka-1.2.9.dev23+g1d32b1f-py3.5.egg/adafruit_blinka/microcontroller/generic_linux/spi.py", line 39, in write
self._spi.open(self._port, 0)
FileNotFoundError: [Errno 2] No such file or directory
From strace, I see that the error is that /dev/spidev0.0 does not exist:
open("/dev/spidev0.0", O_RDWR|O_LARGEFILE) = -1 ENOENT (No such file or directory)
Here are the spidev files that do exist:
debian@beaglebone:~/pocketbeagle_python_tests$ ls -ltar /dev/spidev*
crw-rw---- 1 root spi 153, 0 Apr 3 12:46 /dev/spidev1.0
crw-rw---- 1 root spi 153, 1 Apr 3 12:46 /dev/spidev2.0
crw-rw---- 1 root spi 153, 2 Apr 3 12:46 /dev/spidev2.1
For camparison, Adafruit_BBIO opens /dev/spidev1.0:
debian@beaglebone:~/pocketbeagle_python_tests$ strace -o /tmp/spi.out python3 ./bbio_spi_test.py
[255, 255, 255, 255, 255]
Hello BBIO SPI!
from strace:
open("/dev/spidev1.0", O_RDWR|O_LARGEFILE) = 4
I need to investigate the spidev numbering. It might be related to adafruit/adafruit-beaglebone-io-python#216 I am also looking at get_spi_bus_path_number() in Adafruit_BBIO: https://github.com/adafruit/adafruit-beaglebone-io-python/blob/master/source/common.c#L514
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pdp7
commented on July 24, 2024
@s-light so this comment from @RobertCNelson reminded me that there is an issue with spidev indexes changing between kernels:
adafruit/adafruit-beaglebone-io-python#297 (comment)
and that ultimately /dev/spidevX.Y is not a stable interface. I need to investigate this further to figure out what the correct approach is.
More context in this Adafruit_BBIO issue:
adafruit/adafruit-beaglebone-io-python#263
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pdp7
commented on July 24, 2024
@s-light I chatted with @RobertCNelson in our BeagleBoard.org slack (let me know if you want an invite: [email protected]) and there has been issue of spidev indexes changing depending on the kernel version.
Robert advised me that /dev/spidevX.Y is not a stable interface. We have devised a new scheme to have stable consistent spidev naming in future kernel builds. Something similar was done for PWM: https://github.com/rcn-ee/repos/blob/master/bb-customizations/suite/buster/debian/81-pwm-noroot.rules#L15-L39
the result will be something like:
/dev/spi/0.0
/dev/spi/0.1
/dev/spi/1.0
/dev/spi/1.1
where corresponding to SPI0 and SPI1. These will be symlinks to the correct spidev device node files.
I will follow up with more information as this solution proceeds.
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pdp7
commented on July 24, 2024
@s-light for a short term fix, moving to kernel 4.19 will provide the expected spidev indexes. You could install 4.19 and then Blinka should be ok:
debian@beaglebone:~$ sudo /opt/scripts/tools/update_kernel.sh --ti-channel --lts-4_19
reboot and check:
debian@beaglebone:~$ ls -ltar /dev/spidev*
crw-rw---- 1 root spi 153, 0 Apr 3 21:33 /dev/spidev0.0
crw-rw---- 1 root spi 153, 2 Apr 3 21:33 /dev/spidev1.1
crw-rw---- 1 root spi 153, 1 Apr 3 21:33 /dev/spidev1.0
The oled_display.py program then is able to open the device:
open("/dev/spidev0.0", O_RDWR|O_LARGEFILE) = 4
however I do encounter this error:
debian@beaglebone:~/pocketbeagle_python_tests$ strace -o /tmp/oled.out python3 ./oled_display.py
oled display tests
setup spi
setup digitalio
init SSD1306_SPI
Traceback (most recent call last):
File "./oled_display.py", line 43, in <module>
display = adafruit_ssd1306.SSD1306_SPI(128, 32, spi, pin_dc, pin_rst, pin_cs)
File "/usr/local/lib/python3.5/dist-packages/adafruit_circuitpython_ssd1306-2.6.2-py3.5.egg/adafruit_ssd1306.py", line 222, in __init__
File "/usr/local/lib/python3.5/dist-packages/adafruit_circuitpython_ssd1306-2.6.2-py3.5.egg/adafruit_ssd1306.py", line 81, in __init__
File "/usr/local/lib/python3.5/dist-packages/adafruit_circuitpython_ssd1306-2.6.2-py3.5.egg/adafruit_ssd1306.py", line 142, in poweron
File "/usr/local/lib/python3.5/dist-packages/adafruit_circuitpython_ssd1306-2.6.2-py3.5.egg/adafruit_ssd1306.py", line 228, in write_cmd
File "/usr/local/lib/python3.5/dist-packages/Adafruit_Blinka-1.2.9.dev23+g1d32b1f-py3.5.egg/busio.py", line 129, in write
return self._spi.write(buf, start, end)
File "/usr/local/lib/python3.5/dist-packages/Adafruit_Blinka-1.2.9.dev23+g1d32b1f-py3.5.egg/adafruit_blinka/microcontroller/generic_linux/spi.py", line 47, in write
self._spi.writebytes([x for x in buf[start:end]])
File "/usr/local/lib/python3.5/dist-packages/Adafruit_Blinka-1.2.9.dev23+g1d32b1f-py3.5.egg/adafruit_blinka/microcontroller/generic_linux/spi.py", line 47, in <listcomp>
self._spi.writebytes([x for x in buf[start:end]])
OSError: [Errno 22] Invalid argument
I am not sure if that is because I don't have the hardware or if it a seperate issue. Though invalid argument does make me think there might be some API mismatch.
I should try some tests with SPI hardware that I have with me.
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RobertCNelson
commented on July 24, 2024
So far i've pushed out 7 builds for this:
/dev/spi/0.0
/dev/spi/0.1
/dev/spi/1.0
/dev/spi/1.1
These kernels utilze the symlink..
4.4.155-ti-r154
4.4.155-ti-rt-r154
4.9.147-ti-r120
4.9.147-ti-rt-r120
4.14.108-ti-r103
4.14.108-ti-rt-r103
4.14.108-ti-xenomai-r103
I'll work more tomorrow on v4.19.x and all the bone variants..
Regards,
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pdp7
commented on July 24, 2024
@RobertCNelson thanks for doing that so fast!
For reference, here is a commit to add the /dev/spi/X.Y properties to device tree:
SPIDEV: use symlink label to help udev
beagleboard/bb.org-overlays@d21b116
And udev script that create the corresponding symlinks:
https://github.com/mvduin/py-uio/blob/master/etc/udev/rules.d/10-of-symlink.rules
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pdp7
commented on July 24, 2024
FYI - I ran:
sudo apt install --only-upgrade bb-customizations
sudo /opt/scripts/tools/update_kernel.sh
after reboot, I have the new /dev/spi/X.Y symlinks:
debian@beaglebone:~$ ls -ltar /dev/spidev*
crw-rw---- 1 root spi 153, 0 Apr 5 14:09 /dev/spidev1.0
crw-rw---- 1 root spi 153, 1 Apr 5 14:09 /dev/spidev1.1
crw-rw---- 1 root spi 153, 3 Apr 5 14:09 /dev/spidev2.1
crw-rw---- 1 root spi 153, 2 Apr 5 14:09 /dev/spidev2.0
debian@beaglebone:~$ ls -ltar /dev/spi/
total 0
drwxr-xr-x 2 root root 120 Nov 3 2016 .
drwxr-xr-x 16 root root 3320 Apr 5 14:09 ..
lrwxrwxrwx 1 root root 12 Apr 5 14:09 0.0 -> ../spidev1.0
lrwxrwxrwx 1 root root 12 Apr 5 14:09 0.1 -> ../spidev1.1
lrwxrwxrwx 1 root root 12 Apr 5 14:09 1.1 -> ../spidev2.1
lrwxrwxrwx 1 root root 12 Apr 5 14:09 1.0 -> ../spidev2.0
debian@beaglebone:~$ uname -r
4.14.108-ti-r103
debian@beaglebone:~$ cat /etc/dogtag
BeagleBoard.org Debian Image 2019-03-03
debian@beaglebone:~$ cat /etc/debian_version
9.8
debian@beaglebone:~$ cat /etc/udev/rules.d/10-of-symlink.rules
# vim: ft=udevrules
#From: https://github.com/mvduin/py-uio/blob/master/etc/udev/rules.d/10-of-symlink.rules
# allow declaring a symlink for a device in DT
ATTR{device/of_node/symlink}!="", \
ENV{OF_SYMLINK}="%s{device/of_node/symlink}"
ENV{OF_SYMLINK}!="", ENV{DEVNAME}!="", \
SYMLINK+="%E{OF_SYMLINK}", \
TAG+="systemd", ENV{SYSTEMD_ALIAS}+="/dev/%E{OF_SYMLINK}"
debian@beaglebone:~$
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pdp7
commented on July 24, 2024
I2C testing notes
just for reference, I wanted to share some successful testing that I did, with additional debug info:
- BME280 on BeagleBone Black I2C2
- P9_19 is I2C2 SDA
- P9_20 is I2C2 SCL
debian@beaglebone:~/Adafruit_CircuitPython_BME280$ sudo python3 ./examples/bme280_normal_mode.py
src/board.py: board_id: BEAGLEBONE_BLACK
src/board.py: SCL: I2C2_SCL
src/busio.py: class I2C: init: scl=I2C2_SCL
src/busio.py: class I2C: init: sda=I2C2_SDA
src/busio.py: class I2C: _I2C: <class 'adafruit_blinka.microcontroller.generic_linux.i2c.I2C'>
src/busio.py: class I2C: i2cPorts: ((1, I2C1_SCL, I2C1_SDA), (2, I2C2_SCL, I2C2_SDA))
src/busio.py: class I2C: portId: 1
src/busio.py: class I2C: portScl: I2C1_SCL
src/busio.py: class I2C: portSda: I2C1_SDA
src/busio.py: class I2C: portId: 2
src/busio.py: class I2C: portScl: I2C2_SCL
src/busio.py: class I2C: portSda: I2C2_SDA
src/busio.py: class I2C: scl: I2C2_SCL
src/busio.py: class I2C: sda: I2C2_SDA
generic_linux/i2c.py: class I2C: __init__: bus_num=2
generic_linux/i2c.py: class I2C: __init__: mode=0
generic_linux/i2c.py: class I2C: __init__: self._i2c_bus=None
Temperature: 23.3 C
Humidity: 41.9 %
Pressure: 1004.9 hPa
Altitude = 69.43 meters
- BME280 on PocketBeagle I2C1:
- P2_9 SCL
- P2_11 SDA
debian@beaglebone:~/Adafruit_CircuitPython_BME280$ sudo strace -f -o /tmp/a python3 ./examples/bme280_simpletest.py
src/board.py: board_id: BEAGLEBONE_POCKETBEAGLE
src/board.py: SCL: I2C1_SCL
src/busio.py: class I2C: init: scl=I2C1_SCL
src/busio.py: class I2C: init: sda=I2C1_SDA
src/busio.py: class I2C: _I2C: <class 'adafruit_blinka.microcontroller.generic_linux.i2c.I2C'>
src/busio.py: class I2C: i2cPorts: ((1, I2C1_SCL, I2C1_SDA), (2, I2C2_SCL, I2C2_SDA))
src/busio.py: class I2C: portId: 1
src/busio.py: class I2C: portScl: I2C1_SCL
src/busio.py: class I2C: portSda: I2C1_SDA
src/busio.py: class I2C: scl: I2C1_SCL
src/busio.py: class I2C: sda: I2C1_SDA
generic_linux/i2c.py: class I2C: __init__: bus_num=1
generic_linux/i2c.py: class I2C: __init__: mode=0
generic_linux/i2c.py: class I2C: __init__: self._i2c_bus=None
Temperature: 22.7 C
Humidity: 42.3 %
Pressure: 1004.9 hPa
Altitude = 69.61 meters
^CTraceback (most recent call last):
File "./examples/bme280_simpletest.py", line 24, in <module>
time.sleep(2)
KeyboardInterrupt
debian@beaglebone:~/Adafruit_CircuitPython_BME280$ grep /dev/ /tmp/a
1238 connect(3, {sa_family=AF_UNIX, sun_path="/dev/log"}, 110) = 0
1238 open("/dev/i2c-1", O_RDWR|O_LARGEFILE|O_CLOEXEC) = 4
from adafruit_blinka.
pdp7
commented on July 24, 2024
@s-light it appears that there is a regression in Adafruit_Blink SPI support for the BeagleBone Black. It also prevents SPI from working on the PocketBeagle.
The oled_display.py script for the SSD1306 OLED in SPI mode results in OSError: [Errno 22] Invalid argument on both the PocketBeagle and BeagleBone Black.
Adafruit_Blink tries to set the SPI bus mode to have no CS. However, the Linux SPI driver used on the PocketBeagle and BeagleBone does not support this mode.
For comparison, I am able to get the older https://github.com/adafruit/Adafruit_Python_SSD1306/ to work OK. That library uses Adafruit_GPIO.SPI which uses does not try to set no CS mode.
I am going to open a new issue with much more information.
from adafruit_blinka.
pdp7
commented on July 24, 2024
@s-light after merging PR #105 for issue #104, I tested OK with BME280 connected to SPI0 on PocketBeagle.
Could you try testing SPI again?
Details from the BME280 test:
Make sure pins are configured for SPI0 plus P1.6 as GPIO for CS:
config-pin p1.6 gpio # CS
config-pin p1.8 spi_sclk # SPI0 CLK
config-pin p1.10 spi # SPI0 MISO
config-pin p1.12 spi # SPI0 MOSI
Adafruit_CircuitPython_BME280/examples/bme280_simpletest.py:
import board
import busio
import adafruit_bme280
import digitalio
spi = busio.SPI(board.SCK, board.MOSI, board.MISO)
bme_cs = digitalio.DigitalInOut(board.P1_6)
bme280 = adafruit_bme280.Adafruit_BME280_SPI(spi, bme_cs)
print("\nTemperature: %0.1f C" % bme280.temperature)debian@beaglebone:~$ python3 bme280_simpletest.py
Temperature: 22.0 C
system version info:
debian@beaglebone:~$ cat /etc/dogtag
BeagleBoard.org Debian Image 2019-03-03
debian@beaglebone:~$ uname -r
4.14.78-bone17
debian@beaglebone:~$ cat /etc/debian_version
9.8
debian@beaglebone:~$ ls -ltar /dev/spidev*
crw-rw---- 1 root spi 153, 0 Apr 12 17:41 /dev/spidev0.0
crw-rw---- 1 root spi 153, 1 Apr 12 17:42 /dev/spidev1.0
crw-rw---- 1 root spi 153, 2 Apr 12 17:42 /dev/spidev1.1
from adafruit_blinka.
pdp7
commented on July 24, 2024
Successful test of SSD1306 OLED via SPI on PocketBeagle
debian@beaglebone:~/pocketbeagle_python_tests$ cat ~/pb-config-spi.sh
config-pin p1.2 gpio # RST
config-pin p1.4 gpio # DC
config-pin p1.6 spi_cs # CS
config-pin p1.8 spi_sclk # SPI0 CLK
config-pin p1.10 spi # SPI0 MISO
config-pin p1.12 spi # SPI0 MOSI
debian@beaglebone:~/pocketbeagle_python_tests$ bash ~/pb-config-spi.sh
debian@beaglebone:~/pocketbeagle_python_tests$ python3 ~/pocketbeagle_python_tests/oled_display.py
oled display tests
setup spi
setup digitalio
init SSD1306_SPI
SSD1306_SPI: __init__: spi: <busio.SPI object at 0xb6acbd70>
SSD1306_SPI: __init__: dc: P1_4
SSD1306_SPI: __init__: reset: P1_2
SSD1306_SPI: __init__: cs: P2_6
SSD1306_SPI: __init__: call spi_device.SPIDevice(cs:P2_6)
SSD1306_SPI: __init__: returned self.spi_device: <adafruit_bus_device.spi_device.SPIDevice object at 0xb68d3d30>
SSD1306_SPI: __init__: call super().__init__()
SSD1306_SPI: __init__: return
clear display
draw some test pixels
system version info:
debian@beaglebone:~$ cat /etc/dogtag
BeagleBoard.org Debian Image 2019-03-03
debian@beaglebone:~$ uname -r
4.14.78-bone17
debian@beaglebone:~$ cat /etc/debian_version
9.8
debian@beaglebone:~$ ls -ltar /dev/spidev*
crw-rw---- 1 root spi 153, 0 Apr 12 17:41 /dev/spidev0.0
crw-rw---- 1 root spi 153, 1 Apr 12 17:42 /dev/spidev1.0
crw-rw---- 1 root spi 153, 2 Apr 12 17:42 /dev/spidev1.1
from adafruit_blinka.
pdp7
commented on July 24, 2024
However, the above examples were running 4.14.78-bone17 where SPI0 was /dev/spidev0.0. The bone kernel variant is not the default on the BeagleBoard.org Debian images that @RobertCNelson creates. Switching back to 4.14.108-ti-r103, SPI0 is now /dev/spidev1.0. Temporary workaround is to create a symlink, but this is not a proper solution.
debian@beaglebone:~/pocketbeagle_python_tests$ bash ~/pb-config-spi.sh
debian@beaglebone:~/pocketbeagle_python_tests$ python3 ~/pocketbeagle_python_tests/oled_display.py
oled display tests
setup spi
setup digitalio
init SSD1306_SPI
SSD1306_SPI: __init__: spi: <busio.SPI object at 0xb6a6cd70>
SSD1306_SPI: __init__: dc: P1_4
SSD1306_SPI: __init__: reset: P1_2
SSD1306_SPI: __init__: cs: P2_6
SSD1306_SPI: __init__: call spi_device.SPIDevice(cs:P2_6)
SSD1306_SPI: __init__: returned self.spi_device: <adafruit_bus_device.spi_device.SPIDevice object at 0xb6874d30>
SSD1306_SPI: __init__: call super().__init__()
Could not open SPI device - check if SPI is enabled in kernel!
Traceback (most recent call last):
File "/home/debian/pocketbeagle_python_tests/oled_display.py", line 43, in <module>
display = adafruit_ssd1306.SSD1306_SPI(128, 32, spi, pin_dc, pin_rst, pin_cs)
File "/usr/local/lib/python3.5/dist-packages/adafruit_circuitpython_ssd1306-2.6.3.dev0+gd09c0cb.d20190410-py3.5.egg/adafruit_ssd1306.py", line 229, in __init__
File "/usr/local/lib/python3.5/dist-packages/adafruit_circuitpython_ssd1306-2.6.3.dev0+gd09c0cb.d20190410-py3.5.egg/adafruit_ssd1306.py", line 81, in __init__
File "/usr/local/lib/python3.5/dist-packages/adafruit_circuitpython_ssd1306-2.6.3.dev0+gd09c0cb.d20190410-py3.5.egg/adafruit_ssd1306.py", line 142, in poweron
File "/usr/local/lib/python3.5/dist-packages/adafruit_circuitpython_ssd1306-2.6.3.dev0+gd09c0cb.d20190410-py3.5.egg/adafruit_ssd1306.py", line 236, in write_cmd
File "/usr/local/lib/python3.5/dist-packages/Adafruit_Blinka-1.2.9.dev26+g42d260d-py3.5.egg/busio.py", line 129, in write
return self._spi.write(buf, start, end)
File "/usr/local/lib/python3.5/dist-packages/Adafruit_Blinka-1.2.9.dev26+g42d260d-py3.5.egg/adafruit_blinka/microcontroller/generic_linux/spi.py", line 50, in write
self._spi.open(self._port, 0)
FileNotFoundError: [Errno 2] No such file or directory
debian@beaglebone:~/pocketbeagle_python_tests$ ls -ltar /dev/spidev*
crw-rw---- 1 root spi 153, 0 Apr 12 17:42 /dev/spidev1.0
crw-rw---- 1 root spi 153, 1 Apr 12 17:42 /dev/spidev2.0
crw-rw---- 1 root spi 153, 2 Apr 12 17:42 /dev/spidev2.1
debian@beaglebone:~/pocketbeagle_python_tests$ sudo ln -s /dev/spidev1.0 /dev/spidev0.0
[sudo] password for debian:
debian@beaglebone:~/pocketbeagle_python_tests$ ls -ltar /dev/spidev*
crw-rw---- 1 root spi 153, 0 Apr 12 17:42 /dev/spidev1.0
crw-rw---- 1 root spi 153, 1 Apr 12 17:42 /dev/spidev2.0
crw-rw---- 1 root spi 153, 2 Apr 12 17:42 /dev/spidev2.1
lrwxrwxrwx 1 root root 14 Apr 12 17:44 /dev/spidev0.0 -> /dev/spidev1.0
debian@beaglebone:~/pocketbeagle_python_tests$ python3 ~/pocketbeagle_python_tests/oled_display.py
oled display tests
setup spi
setup digitalio
init SSD1306_SPI
SSD1306_SPI: __init__: spi: <busio.SPI object at 0xb6a7ad70>
SSD1306_SPI: __init__: dc: P1_4
SSD1306_SPI: __init__: reset: P1_2
SSD1306_SPI: __init__: cs: P2_6
SSD1306_SPI: __init__: call spi_device.SPIDevice(cs:P2_6)
SSD1306_SPI: __init__: returned self.spi_device: <adafruit_bus_device.spi_device.SPIDevice object at 0xb6882d30>
SSD1306_SPI: __init__: call super().__init__()
SSD1306_SPI: __init__: return
clear display
draw some test pixels
debian@beaglebone:~/pocketbeagle_python_tests$ ^C
debian@beaglebone:~/pocketbeagle_python_tests$ uname -r
4.14.108-ti-r103
from adafruit_blinka.
pdp7
commented on July 24, 2024
fyi - I have opened #106 for cover the inconsistent spidev path issue that I mention above.
from adafruit_blinka.
pdp7
commented on July 24, 2024
PR #107 has resolved issue #106 by changing spiPorts inside microcontroller/am335x/pin.py to reflect that SPI0 is /dev/spidev1.x and SPI1 is /dev/spidev2.x on both:
- the current recommended BeagleBoard.org Debian image: Debian 9.5 (Stretch) from 2018-10-07
- the newest Debian 9.8 (Strecth) snapshot from 2019-04-07
@s-light when you have time, it would be good to know if SPI now works OK on your PocketBeagle. thanks!
from adafruit_blinka.
s-light
commented on July 24, 2024
thanks for your patience with this ;-)
today i got some time to test this...
this were my testing steps:
- burn
bone-debian-9.5-iot-armhf-2018-10-07-4gb.imgimage to sdcard - boot up
sudo apt updatesudo apt upgradesudo reboot-
$ ls -ltar /dev/spi* crw-rw---- 1 root spi 153, 0 Jun 21 19:55 /dev/spidev1.0 crw-rw---- 1 root spi 153, 1 Jun 21 19:55 /dev/spidev2.0 crw-rw---- 1 root spi 153, 2 Jun 21 19:55 /dev/spidev2.1 cd ~git clone https://github.com/s-light/pocketbeagle_python_tests.gitcd pocketbeagle_python_testspip3 install adafruit-circuitpython-ssd1306pip3 install adafruit-circuitpython-apds9960./detect.pydebian@beaglebone:~/pocketbeagle_python_tests$ ./detect.py Chip id: AM33XX Board id: BEAGLEBONE_POCKETBEAGLE Is this a Pi 3B+? False Is this a 40-pin Raspberry Pi? False Is this a Beagle? True Is this a BBB? False Is this an Orange Pi PC? False Is this a Giant Board? False Is this an embedded Linux system? True Is this a generic Linux PC? False
- blinka basic test was fine:
$ cp_blinka/blinka_test.py Hello blinka! Digital IO ok! I2C ok! I2C_2 ok! SPI ok! SPI_1 ok! done!
cp_blinka/oled_display.py→ enjoy the stars ;-)cp_blinka/i2c_test.py→have to check my wiring...$ cp_blinka/i2c_test.py basic i2c tests []
but basically it seems to work :-)
i will have a look at i2c tomorrow..
from adafruit_blinka.
s-light
commented on July 24, 2024
more tests on I2C:
(just used one of the boards i had available..)
pip3 install adafruit-circuitpython-cap1188-
debian@beaglebone:~/pocketbeagle_python_tests/cp_blinka$ ./i2c_test.py basic i2c tests [41] ./CAP1188.py
→ working :-)- reconnect to APDS9960
-
debian@beaglebone:~/pocketbeagle_python_tests/cp_blinka$ ./i2c_test.py basic i2c tests [57] -
→ working!
debian@beaglebone:~/pocketbeagle_python_tests/cp_blinka$ ./APDS9960.py apds9960 i2c tests setup i2c setup APDS9960 read proximity (for 4seconds) 0 43 39 40 66 255 234 86 43 30 14 14 46 62 29 22 read color Red: 953, Green: 806, Blue: 759, Clear: 1767 waiting for gesture... (10 times - but no timeout) Saw gesture: 3: Left .. Saw gesture: 4: Right .. Saw gesture: 3: Left .. Saw gesture: 4: Right .. Saw gesture: 1: Up .. Saw gesture: 3: Left .. Saw gesture: 2: Down .. Saw gesture: 1: Up .. Saw gesture: 2: Down .. Saw gesture: 4: Right ..
i also added a combined example with I2C and SPI:
combi_APD9960_oled.py
:-)
and this also works :-)
so i think that this is solved!
Thanks for your patience and energy on this!
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makermelissa
commented on July 24, 2024
Thank you for testing this so thoroughly. :)
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