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adafruit / Adafruit_Blinka

Add CircuitPython hardware API and libraries to MicroPython & CPython devices
https://learn.adafruit.com/circuitpython-on-raspberrypi-linux
MIT License
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Raspberry Pi 5 PWMOut needs updating to libgpiod #776

Closed makermelissa closed 3 months ago

makermelissa commented 5 months ago

Board Name

Raspberry Pi 5

Steps

  1. Install Blinka
  2. Install ST7789 lib
  3. Run bonnet example

Description

The following error occurs.

Traceback (most recent call last):
  File "/home/pi/st7789_240x240_bonnet_simpletest.py", line 33, in <module>
    display = ST7789(
              ^^^^^^^
  File "/home/pi/env/lib/python3.11/site-packages/adafruit_st7789.py", line 72, in __init__
    super().__init__(bus, _INIT_SEQUENCE, **kwargs)
  File "/home/pi/env/lib/python3.11/site-packages/displayio/_display.py", line 213, in __init__
    self._backlight = PWMOut(backlight_pin, frequency=100, duty_cycle=0)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/pi/env/lib/python3.11/site-packages/adafruit_blinka/microcontroller/bcm283x/pwmio/PWMOut.py", line 27, in __init__
    self._open(pin, duty_cycle, frequency, variable_frequency)
  File "/home/pi/env/lib/python3.11/site-packages/adafruit_blinka/microcontroller/bcm283x/pwmio/PWMOut.py", line 40, in _open
    GPIO.setup(pin.id, GPIO.OUT)
RuntimeError: Cannot determine SOC peripheral base address

The issue is that version of PWMOut uses RPi.GPIO, which is not available on the Pi 5. The PWMOut for the bcm2712 needs to be rewritten to use libgpiod.

Additional information

No response

makermelissa commented 3 months ago

It looks like the library lgpio (https://github.com/waveform80/rpi-lgpio) may support pwm and run on the pi 5. I'm going to see if it can peacefully coexist with gpiod.